2908 lines
133 KiB
HTML
2908 lines
133 KiB
HTML
<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="utf-8">
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<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">
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<meta name="viewport" content="width=device-width, initial-scale=1">
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<meta name="description" content="Retries help increase service availability. However, if not done right, they can have a devastating impact on the service and elongate recovery time.">
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<meta name="keywords" content="Call graph, Exponential backoff, HTTPS, Circuit Breaker Pattern, Distributed Computing">
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<meta property="og:description" content="Retries help increase service availability. However, if not done right, they can have a devastating impact on the service and elongate recovery time.">
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<meta property="og:site_name" content="dzone.com">
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<meta property="og:title" content="Overcome the Retry Dilemma in Distributed Systems">
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<meta property="og:url" content="https://dzone.com/articles/overcoming-the-retry-dilemma-in-distributed-systems">
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<meta property="og:image" content="https://dz2cdn1.dzone.com/storage/article-thumb/18345305-thumb.jpg">
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<meta property="og:type" content="article">
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<meta name="twitter:site" content="@DZoneInc">
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<meta name="twitter:image" content="https://dz2cdn1.dzone.com/storage/article-thumb/18345305-thumb.jpg">
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<meta name="twitter:card" content="summary_large_image">
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<meta name="twitter:description" content="Retries help increase service availability. However, if not done right, they can have a devastating impact on the service and elongate recovery time.">
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<meta name="twitter:title" content="Overcome the Retry Dilemma in Distributed Systems">
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<meta name="referrer" content="origin-when-cross-origin">
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<meta name="google-site-verification" content="kndbhxcupfEqWmZclhCpB6vlgOs7QSmx2UHAGGnP2mA">
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<meta name="df-verify" content="df0d76632b4543">
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<link rel="icon" type="image/x-icon" href="https://dz2cdn1.dzone.com/themes/dz20/images/favicon.png">
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<link rel="image_src" href="https://dz2cdn1.dzone.com/storage/article-thumb/18345305-thumb.jpg">
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<link rel="canonical" href="https://dzone.com/articles/overcoming-the-retry-dilemma-in-distributed-systems">
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<title>Overcome the Retry Dilemma in Distributed Systems</title>
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<link rel="preload" href="https://dz2cdn1.dzone.com/themes/dz20/font/fontello.woff?11773374" as="font" type="font/woff" crossorigin="anonymous">
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<link rel="stylesheet" media="all" href="https://dz2cdn1.dzone.com/themes/dz20/ftl/icons.css">
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<link rel="stylesheet" media="all" href="https://dz2cdn1.dzone.com/themes/dz20/lib/static/bootstrap/bootstrap.min.css">
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<link rel="stylesheet" media="all" href="https://dz2cdn1.dzone.com/themes/dz20/ftl/article/global.css">
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<link rel="stylesheet" media="all" href="https://dz2cdn1.dzone.com/themes/dz20/ftl/header-updated/styles.css">
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<style>
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:root {
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--xs-size: 2px;
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--sm-size: 5px;
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--md-size: 10px;
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--lg-size: 15px;
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--xl-size: 25px;
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--sm-border-size: 8px;
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--sm-font-size: 13px;
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--sm-plus-font-size: 16px;
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--md-font-size: 18px;
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--lg-font-size: 22px;
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--xl-font-size: 26px;
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}
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/* Display Quick-Access Classes */
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.display-none { display: none; }
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.display-block { display: block; }
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.display-inline { display: inline; }
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.display-inline-block { display: inline-block; }
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/* Margin Quick-Access Classes */
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.m-xs { margin: var(--xs-size); }
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.m-sm { margin: var(--sm-size); }
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.m-md { margin: var(--md-size); }
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.m-lg { margin: var(--lg-size); }
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.m-xl { margin: var(--xl-size); }
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.mt-xs, .my-xs { margin-top: var(--xs-size); }
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.mr-xs, .mx-xs { margin-right: var(--xs-size); }
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.mb-xs, .my-xs { margin-bottom: var(--xs-size); }
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.ml-xs, .mx-xs { margin-left: var(--xs-size); }
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.mt-sm, .my-sm { margin-top: var(--sm-size); }
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.mr-sm, .mx-sm { margin-right: var(--sm-size); }
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.mb-sm, .my-sm { margin-bottom: var(--sm-size); }
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.ml-sm, .mx-sm { margin-left: var(--sm-size); }
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.mt-md, .my-md { margin-top: var(--md-size); }
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.mr-md, .mx-md { margin-right: var(--md-size); }
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.mb-md, .my-md { margin-bottom: var(--md-size); }
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.ml-md, .mx-md { margin-left: var(--md-size); }
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.mt-lg, .my-lg { margin-top: var(--lg-size); }
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.mr-lg, .mx-lg { margin-right: var(--lg-size); }
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.mb-lg, .my-lg { margin-bottom: var(--lg-size); }
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.ml-lg, .mx-lg { margin-left: var(--lg-size); }
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.mt-xl, .my-xl { margin-top: var(--xl-size); }
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.mr-xl, .mx-xl { margin-right: var(--xl-size); }
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.mb-xl, .my-xl { margin-bottom: var(--xl-size); }
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.ml-xl, .mx-xl { margin-left: var(--xl-size); }
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.ml-auto, .mx-auto { margin-left: auto; }
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.mr-auto, .mx-auto { margin-right: auto; }
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.mt-auto, .my-auto { margin-top: auto; }
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.mb-auto, .my-auto { margin-bottom: auto; }
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.my-none, .mt-none { margin-top: 0 !important; }
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.mx-none, .mr-none { margin-right: 0 !important; }
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||
.my-none, .mb-none { margin-bottom: 0 !important; }
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||
.mx-none, .ml-none { margin-left: 0 !important; }
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/* Padding Quick-Access Classes */
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.p-xs { padding: var(--xs-size); }
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.p-sm { padding: var(--sm-size); }
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.p-md { padding: var(--md-size); }
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.p-lg { padding: var(--lg-size); }
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.p-xl { padding: var(--xl-size); }
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.pt-xs, .py-xs { padding-top: var(--xs-size); }
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.pr-xs, .px-xs { padding-right: var(--xs-size); }
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.pb-xs, .py-xs { padding-bottom: var(--xs-size); }
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.pl-xs, .px-xs { padding-left: var(--xs-size); }
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.pt-sm, .py-sm { padding-top: var(--sm-size); }
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.pr-sm, .px-sm { padding-right: var(--sm-size); }
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.pb-sm, .py-sm { padding-bottom: var(--sm-size); }
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.pl-sm, .px-sm { padding-left: var(--sm-size); }
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.pt-md, .py-md { padding-top: var(--md-size); }
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.pr-md, .px-md { padding-right: var(--md-size); }
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.pb-md, .py-md { padding-bottom: var(--md-size); }
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.pl-md, .px-md { padding-left: var(--md-size); }
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.pt-lg, .py-lg { padding-top: var(--lg-size); }
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.pr-lg, .px-lg { padding-right: var(--lg-size); }
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.pb-lg, .py-lg { padding-bottom: var(--lg-size); }
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.pl-lg, .px-lg { padding-left: var(--lg-size); }
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.pt-xl, .py-xl { padding-top: var(--xl-size); }
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.pr-xl, .px-xl { padding-right: var(--xl-size); }
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.pb-xl, .py-xl { padding-bottom: var(--xl-size); }
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.pl-xl, .px-xl { padding-left: var(--xl-size); }
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.py-none, .pt-none { padding-top: 0 !important; }
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.px-none, .pr-none { padding-right: 0 !important; }
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||
.py-none, .pb-none { padding-bottom: 0 !important; }
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.px-none, .pl-none { padding-left: 0 !important; }
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/* Flex Quick-Access Classes */
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.flex {
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display: flex;
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}
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.flex-column {
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display: flex;
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flex-direction: column;
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}
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.flex-column-reverse {
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display: flex;
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flex-direction: column-reverse;
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}
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.flex-row {
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display: flex;
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flex-direction: row;
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}
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.flex-row-reverse {
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display: flex;
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flex-direction: row-reverse;
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}
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.flex-wrap {
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flex-wrap: wrap;
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}
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.flex-grow {
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flex-grow: 1;
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}
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.align-center { align-items: center; }
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.align-end { align-items: flex-end; }
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.content-center {
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align-content: center;
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}
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.justify-center { justify-content: center; }
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.justify-start { justify-content: flex-start; }
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.justify-end { justify-content: flex-end; }
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.justify-around { justify-content: space-around; }
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.justify-between { justify-content: space-between; }
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.justify-evenly { justify-content: space-evenly; }
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.gap-sm { gap: var(--sm-size); }
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.gap-md { gap: var(--md-size); }
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.gap-lg { gap: var(--lg-size); }
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.gap-xl { gap: var(--xl-size); }
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/* Display Quick-Access Classes */
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||
.inline-block { display: inline-block; }
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||
|
||
/* Font Quick-Access Classes */
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||
.font-xl { font-size: var(--xl-font-size); }
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.font-lg { font-size: var(--lg-font-size); }
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.font-md { font-size: var(--md-font-size); }
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.font-sm-plus { font-size: var(--sm-plus-font-size); }
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.font-sm { font-size: var(--sm-font-size); }
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.font-strike { text-decoration: line-through; }
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.font-underline { text-decoration: underline; }
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.font-overline { text-decoration: overline; }
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||
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||
.font-italic { font-style: italic; }
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||
.font-bold { font-weight: bold; }
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.font-black { color: #000000; }
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||
.font-white { color: #ffffff; }
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||
.font-gray { color: var(--brand-gray-text); }
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||
.font-danger { color: var(--header-dropdown-button-bg-danger); }
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||
.font-center { text-align: center; }
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||
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||
.no-wrap { white-space: nowrap; }
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||
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||
/* Consistent headings between h and non-h tags */
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||
.heading {
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||
margin-top: 0;
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||
margin-bottom: var(--md-size);
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}
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||
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||
.heading.font-xl { line-height: var(--xl-font-size); }
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.heading.font-lg { line-height: var(--lg-font-size); }
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||
.heading.font-md { line-height: var(--md-font-size); }
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||
.heading.font-sm-plus { line-height: var(--sm-plus-font-size); }
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||
.heading.font-sm { line-height: var(--sm-font-size); }
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||
|
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/* Font Clamp Quick-Access Classes */
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||
.line-clamp,
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||
.line-clamp-2,
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||
.line-clamp-3,
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||
.line-clamp-4,
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||
.line-clamp-5 {
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||
display: -webkit-box;
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||
-webkit-line-clamp: 4;
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||
-webkit-box-orient: vertical;
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||
overflow: hidden;
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||
text-overflow: ellipsis;
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||
}
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||
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||
.line-clamp-2 { -webkit-line-clamp: 2 !important; }
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||
.line-clamp-3 { -webkit-line-clamp: 3 !important; }
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||
.line-clamp-4 { -webkit-line-clamp: 4 !important; }
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||
.line-clamp-5 { -webkit-line-clamp: 5 !important; }
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||
|
||
/* User-Select Quick-Access Classes */
|
||
.select-none { user-select: none; }
|
||
|
||
/* Position Quick-Access Classes */
|
||
.absolute { position: absolute; }
|
||
.relative { position: relative; }
|
||
.float-left { float: left; }
|
||
.float-right { float: right; }
|
||
|
||
.pos-top { top: 0; }
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||
.pos-right { right: 0; }
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||
.pos-bottom { bottom: 0; }
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||
.pos-left { left: 0; }
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||
|
||
.va-top { vertical-align: top; }
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||
.va-middle { vertical-align: middle; }
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||
.va-bottom { vertical-align: bottom; }
|
||
|
||
/* Transition Quick-Access Classes */
|
||
.trans-linear-quick {
|
||
transition: all 0.15s linear;
|
||
}
|
||
|
||
/* Background Quick-Access Classes */
|
||
.bg-gray { background: #cccccc; }
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||
.bg-white { background-color: white; }
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||
.bg-none { background: none; }
|
||
|
||
/* Border Quick-Access Classes */
|
||
.border-gray { border: 1px solid #cccccc; }
|
||
.tab-pane.border-gray { border: 1px solid #ddd; }
|
||
.no-border, .border-none { border: none !important; }
|
||
|
||
.bt-none { border-top: none !important; }
|
||
.br-none { border-right: none !important; }
|
||
.bb-none { border-bottom: none !important; }
|
||
.bl-none { border-left: none !important; }
|
||
|
||
/* Border Radius Quick-Access Classes */
|
||
|
||
.round-t-sm, .round-tl-sm { border-top-left-radius: var(--sm-border-size); }
|
||
.round-t-sm, .round-tr-sm { border-top-right-radius: var(--sm-border-size); }
|
||
.round-b-sm, .round-bl-sm { border-bottom-left-radius: var(--sm-border-size); }
|
||
.round-b-sm, .round-br-sm { border-bottom-right-radius: var(--sm-border-size); }
|
||
.round-sm { border-radius: var(--sm-border-size); }
|
||
.round-fully { border-radius: 50%; }
|
||
|
||
/* Misc Quick-Access Classes */
|
||
.haikei {
|
||
position: relative;
|
||
background-image: url('https://dz2cdn1.dzone.com/themes/dz20/images/polygon-scatter-haikei-shapes.svg');
|
||
background-repeat: no-repeat;
|
||
background-size: cover;
|
||
}
|
||
|
||
.haikei:before {
|
||
content: '';
|
||
position:absolute;
|
||
top: 0;
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||
left: 0;
|
||
width: 100%;
|
||
height: 100%;
|
||
background-color: var(--color-event-background);
|
||
z-index: -1;
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||
}
|
||
|
||
.margin-auto-center {
|
||
display: block;
|
||
margin-left: auto;
|
||
margin-right: auto;
|
||
}
|
||
|
||
.flex-auto-center {
|
||
display: flex;
|
||
margin-left: auto;
|
||
margin-right: auto;
|
||
}
|
||
|
||
.mw-1100 { max-width: 1100px; }
|
||
.mw-1300 { max-width: 1300px; }
|
||
.full-width { width: 100%; }
|
||
|
||
.h-separator {
|
||
background-color: #cccccc;
|
||
height: 1px;
|
||
width: 100%;
|
||
margin: 5px auto;
|
||
}
|
||
|
||
.no-spacing {
|
||
margin: 0 !important;
|
||
padding: 0 !important;
|
||
}
|
||
|
||
.inherit-color { color: inherit; }
|
||
|
||
.inherit-decoration { text-decoration: inherit; }
|
||
|
||
/* Table Quick-Access Classes */
|
||
.table-border-gray tr:not(:last-child) {
|
||
border-bottom: 1px solid #cccccc;
|
||
}
|
||
|
||
table.full-width tr td:last-child {
|
||
width:100%;
|
||
}
|
||
|
||
/* Animation Quick-Access Classes */
|
||
@keyframes anim-spin {
|
||
0% { transform: rotate(0deg); }
|
||
100% { transform: rotate(359deg); }
|
||
}
|
||
|
||
.anim-spin {
|
||
display: inline-block;
|
||
animation: anim-spin 2s infinite linear;
|
||
}
|
||
|
||
.hov-pointer { cursor: pointer; }
|
||
.hov-brighten:hover { filter: brightness(1.2); }
|
||
.hov-darken:hover { filter: brightness(0.95); }
|
||
.hov-underline:hover { text-decoration: underline; }
|
||
|
||
/* Small tweaks related to components when using these styles */
|
||
.nav-tabs {
|
||
border-bottom: none;
|
||
}
|
||
.tab-content > .flex-column.active,
|
||
.tab-content > .flex-row.active {
|
||
display: flex;
|
||
}
|
||
|
||
/* Alpine components with x-cloak should not be visible by default until conditionals kick in */
|
||
[x-cloak] { display: none !important; }
|
||
</style>
|
||
<link rel="stylesheet" media="all" href="https://dz2cdn1.dzone.com/themes/dz20/ftl/alpine-components/modal.css">
|
||
<script defer src="https://dz2cdn1.dzone.com/themes/dz20/lib/alpinejs/3.13.2/cdn.min.js"></script>
|
||
<script>
|
||
document.addEventListener('alpine:init', () => {
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||
Alpine.store('article', {
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id: null,
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engagement: {
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||
open: false,
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||
page: 1,
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users: [],
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||
additional: true,
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||
loading: false,
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||
initializing: false,
|
||
unauthorized: false,
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||
enqueued: null,
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||
dequeued: null,
|
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|
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reset() {
|
||
this.open = false;
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this.page = 1;
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this.users.splice(0);
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this.additional = true;
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this.loading = false;
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this.initializing = false;
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this.enqueued = null;
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this.dequeued = null;
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},
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enqueue(user) {
|
||
this.dequeued = null;
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this.enqueued = user;
|
||
},
|
||
|
||
dequeue(user) {
|
||
this.enqueued = null;
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this.dequeued = user;
|
||
},
|
||
|
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add(user) {
|
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this.users.push(user);
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this.enqueued = null;
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},
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remove(user) {
|
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const index = this.users.findIndex(u => u.id === user.id);
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if (index !== -1) {
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this.users.splice(index, 1);
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}
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this.dequeued = null;
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},
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contains(user) {
|
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return this.users.filter(u => u.id === user.id).length;
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}
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}
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});
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Alpine.effect(() => {
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const store = Alpine.store('article');
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if (!store.engagement.additional && store.engagement.enqueued) {
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if (!store.engagement.contains(store.engagement.enqueued)) {
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store.engagement.add(store.engagement.enqueued);
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Alpine.effect(() => {
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const store = Alpine.store('article');
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if (store.engagement.page && store.engagement.dequeued) {
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store.engagement.remove(store.engagement.dequeued);
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||
});
|
||
</script></head>
|
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<body x-data>
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<div class="skybox skybox-closeBtn dz_skybox" data-gpt-slot="skybox" id="div-gpt-ad-1435246566686-99"></div>
|
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<header id="ftl-header">
|
||
<div class="header-top">
|
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<div class="header-container">
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||
<div class="pull-left logo-container">
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<div class="logo">
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<a class="inner" href="/">
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<picture>
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<source srcset="https://dz2cdn1.dzone.com/themes/dz20/images/dz_logo_2021_cropped.webp" type="image/webp">
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<source srcset="https://dz2cdn1.dzone.com/themes/dz20/images/dz_logo_2021_cropped.png" type="image/png">
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<img src="https://dz2cdn1.dzone.com/themes/dz20/images/dz_logo_2021_cropped.png" width="181" height="56" alt="DZone">
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</picture>
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</a>
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<div class="pull-right login-and-search">
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<div id="authenticated-block" class="logged-in">
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<div class="welcome-back">Thanks for visiting DZone today,</div>
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<div id="user-header" class="user-info">
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<button class="user-avatar">
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<span id="header-username" class="username"></span>
|
||
<img id="header-avatar" src="" alt="user avatar">
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||
</button>
|
||
<div id="user-dropdown" class="browse-user-menu">
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||
<div class="user-content">
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||
<a id="header-user-plug" href="#" class="user-description"></a>
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<a id="header-user-edit" href="#" class="edit-profile">Edit Profile</a>
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</div>
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<ul class="user-actions">
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<li id="first-user-action">
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<a id="header-dropdown-manage-email" href="#">Manage Email Subscriptions</a>
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</li>
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<li>
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<a href="/articles/how-to-submit-a-post-to-dzone?utm_source=DZone&utm_medium=user_dropdown&utm_campaign=how_to_post">
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</a>
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<a href="/articles/dzones-article-submission-guidelines">
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</ul>
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<div class="bottom">
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<a href="/users/logout.html" class="sign-out">Sign Out</a>
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<a id="dropdown-view-profile" href="#" class="view-profile">View Profile</a>
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</div>
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</div>
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</div>
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<div class="post-content">
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<button id="post-button" class="post-content--button">
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<span class="post-class">Post</span>
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<i class="icon-plus"></i>
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</button>
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<div id="post-menu" class="posting-links">
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<div class="posting-links-menu">
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<ul>
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<li>
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<img src="https://dz2cdn1.dzone.com/themes/dz20/images/dz-postarticle.svg" width="15" height="18" style="width: 15px; height: 18px;">
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<a href="/content/article/post.html">Post an Article</a>
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</li>
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<li>
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<a id="drafts-link" href="#">Manage My Drafts</a>
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</li>
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</ul>
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</div>
|
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</div>
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</div>
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</div>
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<div id="unauthenticated-block">
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<div class="dz-intro">Over 2 million developers have joined DZone.</div>
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<a href="/users/login.html">Log In</a>
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<a href="/static/registration.html">Join</a>
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</div>
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<a class="join-icon" href="/users/login.html" aria-label="User">
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<svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="lucide svg-user lucide-user-icon lucide-user">
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<path d="M19 21v-2a4 4 0 0 0-4-4H9a4 4 0 0 0-4 4v2"></path>
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<circle cx="12" cy="7" r="4"></circle>
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</svg>
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</a>
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</div>
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<script>
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document.addEventListener('alpine:init', () => {
|
||
Alpine.data('searchDrawer', () => ({
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||
open: false,
|
||
query: '',
|
||
minCharsMet: false,
|
||
|
||
toggleVisibility() {
|
||
this.open = !this.open;
|
||
if (this.open) {
|
||
this.$nextTick(() => {
|
||
this.$refs.query.focus();
|
||
});
|
||
}
|
||
},
|
||
|
||
updateSearchValue() {
|
||
if (!this.query || !this.query.length || this.query.length < 3) {
|
||
this.minCharsMet = false;
|
||
return;
|
||
}
|
||
this.minCharsMet = true;
|
||
localStorage.setItem('ls.searchValue', this.query);
|
||
},
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||
|
||
searchSite() {
|
||
if (this.minCharsMet) {
|
||
window.location = '/search';
|
||
}
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||
}
|
||
}));
|
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});
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</script>
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<div class="headerSearch" x-data="searchDrawer()" x-cloak>
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<button class="btn-search dropdown-toggle" x-on:click="toggleVisibility()" aria-label="Search">
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<svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="lucide svg-search lucide-search-icon lucide-search">
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<path d="m21 21-4.34-4.34"></path>
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||
<circle cx="11" cy="11" r="8"></circle>
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||
</svg>
|
||
</button>
|
||
<template x-teleport=".header-container">
|
||
<div id="search-drawer" x-show="open" x-on:click.outside="open = false" x-transition>
|
||
<div class="search-input">
|
||
<input type="text"
|
||
placeholder="Search"
|
||
autofocus="autofocus"
|
||
x-model="query"
|
||
x-ref="query"
|
||
x-on:input.change="updateSearchValue()"
|
||
x-on:keyup.enter="searchSite()"
|
||
>
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||
<button x-on:click="searchSite()" x-bind:disabled="!minCharsMet">
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||
<span>Search</span>
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</button>
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</div>
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<div class="search-footer">
|
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Please enter at least three characters to search
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</div>
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</div>
|
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</template>
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</div>
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</div>
|
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</div> </div>
|
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<div class="header-bottom">
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<div class="header-bottom-container">
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<a class="resource-link" href="/refcardz">Refcards</a>
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<a class="resource-link" href="/trendreports">Trend Reports</a>
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<div class="resource-link link-menu">
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<a href="/events">Events</a>
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<a href="/events/video-library">Video Library</a>
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</div>
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</div>
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</div>
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<nav class="header-menu-bar">
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<div class="header-menu resource-category">
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<a href="/refcardz">Refcards</a>
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</div>
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<div class="header-menu-separator resource-category-separator"></div>
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<div class="header-menu resource-category">
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<a href="/trendreports">Trend Reports</a>
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</div>
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<div class="header-menu-separator resource-category-separator"></div>
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<div class="header-menu resource-category no-bottom-radius" data-click-activation>
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<p class="menu-label">Events</p>
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<div class="header-menu-items">
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<div class="header-menu-columns">
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<a class="header-menu-item" href="/events">View Events</a>
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<a class="header-menu-item" href="/events/video-library">Video Library</a>
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</div>
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</div>
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</div>
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<div class="header-menu zone-menu" data-click-activation>
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<p class="menu-label">Zones <i class="icon-down-dir icon-closed"></i><i class="icon-right-dir icon-open"></i></p>
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<div class="header-menu-items">
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<div class="header-menu-columns">
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<div class="header-menu-column-item">
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<a class="header-menu-item" href="/culture-and-methodologies">Culture and Methodologies</a>
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<a class="header-menu-item" href="/agile">Agile</a>
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<a class="header-menu-item" href="/career-development">Career Development</a>
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<a class="header-menu-item" href="/methodologies">Methodologies</a>
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<a class="header-menu-item" href="/team-management">Team Management</a>
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</div>
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<div class="header-menu-column-item">
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<a class="header-menu-item" href="/data-engineering">Data Engineering</a>
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<a class="header-menu-item" href="/ai-ml">AI/ML</a>
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<a class="header-menu-item" href="/big-data">Big Data</a>
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<a class="header-menu-item" href="/data">Data</a>
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<a class="header-menu-item" href="/databases">Databases</a>
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<a class="header-menu-item" href="/iot">IoT</a>
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</div>
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<div class="header-menu-column-item">
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<a class="header-menu-item" href="/software-design-and-architecture">Software Design and Architecture</a>
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<a class="header-menu-item" href="/cloud-architecture">Cloud Architecture</a>
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<a class="header-menu-item" href="/containers">Containers</a>
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<a class="header-menu-item" href="/integration">Integration</a>
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<a class="header-menu-item" href="/microservices">Microservices</a>
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<a class="header-menu-item" href="/performance">Performance</a>
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<a class="header-menu-item" href="/security">Security</a>
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</div>
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<div class="header-menu-column-item">
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<a class="header-menu-item" href="/coding">Coding</a>
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<a class="header-menu-item" href="/frameworks">Frameworks</a>
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<a class="header-menu-item" href="/java">Java</a>
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<a class="header-menu-item" href="/languages">Languages</a>
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<a class="header-menu-item" href="/tools">Tools</a>
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</div>
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<div class="header-menu-column-item">
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<a class="header-menu-item" href="/testing-deployment-and-maintenance">Testing, Deployment, and Maintenance</a>
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<a class="header-menu-item" href="/deployment">Deployment</a>
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<a class="header-menu-item" href="/devops-and-cicd">DevOps and CI/CD</a>
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<a class="header-menu-item" href="/maintenance">Maintenance</a>
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<a class="header-menu-item" href="/monitoring-and-observability">Monitoring and Observability</a>
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<a class="header-menu-item" href="/testing-tools-and-frameworks">Testing, Tools, and Frameworks</a>
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</div>
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<a class="header-menu-item" href="javascript:void(0)">Partner Zones</a>
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<a class="header-menu-item" href="/hubs/build-ai-agents-that-are-ready-for-production/">Build AI Agents That Are Ready for Production</a>
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</div>
|
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</div>
|
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</div>
|
||
</div>
|
||
<div class="header-menu parent-category" tabindex="1">
|
||
<a href="/culture-and-methodologies">Culture and Methodologies</a>
|
||
<div class="header-menu-items">
|
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<a class="header-menu-item" href="/agile">Agile</a>
|
||
<a class="header-menu-item" href="/career-development">Career Development</a>
|
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<a class="header-menu-item" href="/methodologies">Methodologies</a>
|
||
<a class="header-menu-item" href="/team-management">Team Management</a>
|
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</div>
|
||
</div>
|
||
<div class="header-menu-separator parent-category-separator"></div>
|
||
<div class="header-menu parent-category" tabindex="2">
|
||
<a href="/data-engineering">Data Engineering</a>
|
||
<div class="header-menu-items">
|
||
<a class="header-menu-item" href="/ai-ml">AI/ML</a>
|
||
<a class="header-menu-item" href="/big-data">Big Data</a>
|
||
<a class="header-menu-item" href="/data">Data</a>
|
||
<a class="header-menu-item" href="/databases">Databases</a>
|
||
<a class="header-menu-item" href="/iot">IoT</a>
|
||
</div>
|
||
</div>
|
||
<div class="header-menu-separator parent-category-separator"></div>
|
||
<div class="header-menu parent-category" tabindex="3">
|
||
<a href="/software-design-and-architecture">Software Design and Architecture</a>
|
||
<div class="header-menu-items">
|
||
<a class="header-menu-item" href="/cloud-architecture">Cloud Architecture</a>
|
||
<a class="header-menu-item" href="/containers">Containers</a>
|
||
<a class="header-menu-item" href="/integration">Integration</a>
|
||
<a class="header-menu-item" href="/microservices">Microservices</a>
|
||
<a class="header-menu-item" href="/performance">Performance</a>
|
||
<a class="header-menu-item" href="/security">Security</a>
|
||
</div>
|
||
</div>
|
||
<div class="header-menu-separator parent-category-separator"></div>
|
||
<div class="header-menu parent-category" tabindex="4">
|
||
<a href="/coding">Coding</a>
|
||
<div class="header-menu-items">
|
||
<a class="header-menu-item" href="/frameworks">Frameworks</a>
|
||
<a class="header-menu-item" href="/java">Java</a>
|
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<a class="header-menu-item" href="/javascript">JavaScript</a>
|
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<a class="header-menu-item" href="/languages">Languages</a>
|
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<a class="header-menu-item" href="/tools">Tools</a>
|
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</div>
|
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</div>
|
||
<div class="header-menu-separator parent-category-separator"></div>
|
||
<div class="header-menu parent-category" tabindex="5">
|
||
<a href="/testing-deployment-and-maintenance">Testing, Deployment, and Maintenance</a>
|
||
<div class="header-menu-items">
|
||
<a class="header-menu-item" href="/deployment">Deployment</a>
|
||
<a class="header-menu-item" href="/devops-and-cicd">DevOps and CI/CD</a>
|
||
<a class="header-menu-item" href="/maintenance">Maintenance</a>
|
||
<a class="header-menu-item" href="/monitoring-and-observability">Monitoring and Observability</a>
|
||
<a class="header-menu-item" href="/testing-tools-and-frameworks">Testing, Tools, and Frameworks</a>
|
||
</div>
|
||
</div>
|
||
<div class="header-menu-separator parent-category-separator"></div>
|
||
<div class="header-menu parent-category sponsored" tabindex="6">
|
||
<a href="javascript:void(0)">Partner Zones</a>
|
||
<div class="header-menu-items sponsored">
|
||
<a class="header-menu-item" href="/hubs/build-ai-agents-that-are-ready-for-production/">Build AI Agents That Are Ready for Production</a>
|
||
</div>
|
||
</div>
|
||
<div class="header-menu-separator parent-category-separator"></div>
|
||
</nav>
|
||
</header>
|
||
|
||
<script>
|
||
const csrf = {
|
||
parameter: 'TH_CSRF',
|
||
header: 'X-TH-CSRF',
|
||
token: '-8049692680858664095'
|
||
}; // set csrf for auth-status script
|
||
</script>
|
||
<script>
|
||
addEventListener('DOMContentLoaded', function() {
|
||
handleRedirects();
|
||
handleMenus();
|
||
handleMobileMenuHeights();
|
||
handleGotoLinks();
|
||
});
|
||
|
||
function isHidden(element) {
|
||
try {
|
||
return window.getComputedStyle(element).display === 'none';
|
||
} catch (_) {
|
||
return false;
|
||
}
|
||
}
|
||
|
||
function getLink(element) {
|
||
if (element.hasAttribute('data-goto')) {
|
||
return element.getAttribute('data-goto');
|
||
}
|
||
return element.href;
|
||
}
|
||
|
||
function isLeftClick(event) {
|
||
if (event.altKey || event.shiftKey) {
|
||
return false;
|
||
} else if ('buttons' in event || 'which' in event) {
|
||
return event.buttons === 1 || event.which === 1;
|
||
} else {
|
||
return (event.button === 1 || (event.type === 'click'));
|
||
}
|
||
}
|
||
|
||
function handleRedirects() {
|
||
const redirections = [...document.querySelectorAll('[data-activate-menu]'), ...document.querySelectorAll('[data-click-target]')];
|
||
|
||
redirections.forEach(function(element) {
|
||
const menuSelector = element.getAttribute('data-activate-menu') || element.getAttribute('data-click-target');
|
||
const redirectingElement = document.querySelector(menuSelector);
|
||
if (redirectingElement) {
|
||
element.style.cursor = 'pointer';
|
||
const redirect = function(e) {
|
||
if (redirectingElement.hasAttribute('href') || redirectingElement.hasAttribute('data-goto')) {
|
||
if (redirectingElement.hasAttribute('data-new-window') || e.ctrlKey || e.metaKey) {
|
||
window.open(getLink(redirectingElement), '_blank');
|
||
} else {
|
||
window.open(getLink(redirectingElement), '_self');
|
||
}
|
||
} else {
|
||
const evt = new e.constructor(e.type, e);
|
||
redirectingElement.dispatchEvent(evt);
|
||
}
|
||
};
|
||
element.addEventListener('mouseup', redirect);
|
||
element.addEventListener('mousedown', (e) => e.preventDefault());
|
||
element.addEventListener('click', (e) => e.preventDefault());
|
||
}
|
||
});
|
||
}
|
||
|
||
function handleMenus() {
|
||
const menuElements = [
|
||
...document.querySelectorAll('.header-menu > a'),
|
||
...document.querySelectorAll('.header-menu > p.menu-label')
|
||
];
|
||
|
||
let scrollYMemory = -1;
|
||
|
||
function scrollToMemory() {
|
||
if (scrollYMemory !== -1) {
|
||
setTimeout(function() {
|
||
window.scrollTo(0, scrollYMemory);
|
||
scrollYMemory = -1;
|
||
}, 10);
|
||
}
|
||
}
|
||
|
||
function hideMenus() {
|
||
// unfocus menus & items, and set the menus to non-visible.
|
||
menuElements.forEach(function (element) {
|
||
element.blur();
|
||
element.parentElement.blur();
|
||
element.parentElement.classList.remove('menu-opened');
|
||
const menuItems = element.parentElement.querySelector('.header-menu-items');
|
||
if (menuItems) {
|
||
menuItems.style.display = 'none';
|
||
}
|
||
});
|
||
const wasHidden = document.body.style.overflowY === 'hidden';
|
||
document.body.style.overflowY = 'auto';
|
||
if (wasHidden) {
|
||
scrollToMemory();
|
||
}
|
||
}
|
||
|
||
function isEventOutsideMenu(e) {
|
||
return e.target.closest && !e.target.closest('.header-menu') && !e.target.closest('[data-activate-menu]');
|
||
}
|
||
|
||
// Handle mobile menu toggling
|
||
menuElements.forEach(function(element) {
|
||
const menu = element.parentElement;
|
||
const headerItems = menu.querySelector('.header-menu-items');
|
||
const menuEntries = headerItems ? headerItems.querySelectorAll('.header-menu-item') : [];
|
||
|
||
const focus = function() {
|
||
menu.focus();
|
||
menu.classList.add('menu-opened');
|
||
if (headerItems) {
|
||
headerItems.style.display = 'block';
|
||
}
|
||
if (menu.classList.contains('zone-menu')) {
|
||
scrollYMemory = window.scrollY;
|
||
document.body.style.overflowY = 'hidden';
|
||
} else {
|
||
scrollYMemory = -1;
|
||
}
|
||
};
|
||
|
||
const unfocus = function() {
|
||
menu.blur();
|
||
menu.classList.remove('menu-opened');
|
||
if (headerItems) {
|
||
headerItems.style.display = 'none';
|
||
}
|
||
const wasHidden = document.body.style.overflowY === 'hidden';
|
||
document.body.style.overflowY = 'auto';
|
||
if (wasHidden) {
|
||
scrollToMemory();
|
||
}
|
||
};
|
||
|
||
const toggleMenuVisibility = function(e) {
|
||
if ((e.type === 'click' || e.type === 'mouseup') && !isLeftClick(e)) {
|
||
e.preventDefault();
|
||
return;
|
||
}
|
||
const hidden = isHidden(headerItems);
|
||
if (menu.hasAttribute('data-click-activation')) { // handle click activated toggling
|
||
if (hidden) {
|
||
hideMenus(); // hide other open menus first
|
||
focus();
|
||
} else {
|
||
unfocus();
|
||
}
|
||
e.preventDefault();
|
||
} else if (hidden) {
|
||
hideMenus(); // hide other open menus first
|
||
focus();
|
||
e.preventDefault(); // prevent 'click' event from firing when menu is hidden
|
||
}
|
||
};
|
||
|
||
element.addEventListener('touchend', toggleMenuVisibility);
|
||
element.addEventListener('mouseup', toggleMenuVisibility);
|
||
|
||
// Add hover events to non-click-activated menus, even though CSS should cover it.
|
||
if (!menu.hasAttribute('data-click-activation')) {
|
||
menu.addEventListener('mouseover', function () {
|
||
hideMenus(); // hide other open menus first
|
||
focus();
|
||
});
|
||
|
||
menu.addEventListener('mouseout', function (e) {
|
||
if (isEventOutsideMenu(e)) {
|
||
unfocus();
|
||
}
|
||
});
|
||
}
|
||
|
||
// Hide menu when child is clicked
|
||
menuEntries.forEach(function(menuEntry) {
|
||
const linkToItem = function(e) {
|
||
if (e.type === 'mousedown' || e.type === 'click') {
|
||
e.preventDefault();
|
||
return;
|
||
}
|
||
if (e.type === 'mouseup' && !isLeftClick(e)) {
|
||
e.preventDefault();
|
||
return;
|
||
}
|
||
window.open(getLink(menuEntry), (e.ctrlKey || e.metaKey) ? '_blank' : (menuEntry.target || '_self'));
|
||
unfocus();
|
||
e.preventDefault();
|
||
};
|
||
|
||
const linkToMobileItem = function(e) {
|
||
if (e.type === 'touchstart') {
|
||
menuEntry.setAttribute('data-touchmove', false);
|
||
} else if (e.type === 'touchmove') {
|
||
menuEntry.setAttribute('data-touchmove', true);
|
||
} else if (e.type === 'touchend' && (!menuEntry.hasAttribute('data-touchmove') || menuEntry.getAttribute('data-touchmove').toLowerCase() === 'false')) {
|
||
window.open(getLink(menuEntry), (e.ctrlKey || e.metaKey) ? '_blank' : (menuEntry.target || '_self'));
|
||
unfocus();
|
||
e.preventDefault();
|
||
}
|
||
};
|
||
|
||
menuEntry.addEventListener('mousedown', linkToItem);
|
||
menuEntry.addEventListener('mouseup', linkToItem);
|
||
menuEntry.addEventListener('click', linkToItem);
|
||
menuEntry.addEventListener('touchstart', linkToMobileItem);
|
||
menuEntry.addEventListener('touchmove', linkToMobileItem);
|
||
menuEntry.addEventListener('touchend', linkToMobileItem);
|
||
});
|
||
});
|
||
|
||
function hideIfNonMenuBounds(e) {
|
||
if (isEventOutsideMenu(e)) {
|
||
hideMenus();
|
||
}
|
||
}
|
||
|
||
addEventListener('mousemove', hideIfNonMenuBounds);
|
||
addEventListener('touchend', hideIfNonMenuBounds);
|
||
addEventListener('mouseup', hideIfNonMenuBounds);
|
||
addEventListener('mousedown', hideIfNonMenuBounds);
|
||
addEventListener('click', hideIfNonMenuBounds);
|
||
}
|
||
|
||
function handleMobileMenuHeights() {
|
||
function setAppHeight() {
|
||
document.documentElement.style.setProperty('--app-height', window.innerHeight + 'px');
|
||
}
|
||
|
||
addEventListener('resize', function() {
|
||
setAppHeight();
|
||
});
|
||
|
||
setAppHeight();
|
||
}
|
||
|
||
function handleGotoLinks() {
|
||
// Add anchor mimicking to elements with data-goto attributes
|
||
// This addresses SEO concerns of linking to noindex pages by allowing JS to handle the URL
|
||
const anchorElements = document.querySelectorAll('*[data-goto]');
|
||
anchorElements.forEach((anchorElement) => {
|
||
anchorElement.addEventListener('mouseover', () => {
|
||
anchorElement.style.cursor = 'pointer';
|
||
anchorElement.style.textDecoration = 'underline';
|
||
});
|
||
anchorElement.addEventListener('mouseout', () => {
|
||
anchorElement.style.cursor = 'unset';
|
||
anchorElement.style.textDecoration = 'unset';
|
||
});
|
||
anchorElement.addEventListener('mouseup', (e) => {
|
||
e.preventDefault();
|
||
});
|
||
anchorElement.addEventListener('mousedown', (e) => {
|
||
e.preventDefault();
|
||
});
|
||
anchorElement.addEventListener('click', (e) => {
|
||
e.preventDefault();
|
||
const anchorHref = anchorElement.getAttribute('data-goto');
|
||
if (anchorElement.hasAttribute('data-new-window') || e.ctrlKey || e.metaKey) {
|
||
window.open(anchorHref, '_blank');
|
||
} else {
|
||
window.open(anchorHref, '_self');
|
||
}
|
||
});
|
||
});
|
||
}
|
||
</script><script>
|
||
const authenticatedBlock = document.querySelector('#authenticated-block');
|
||
const unauthenticatedBlock = document.querySelector('#unauthenticated-block');
|
||
|
||
let authenticated = {
|
||
isAuthenticated: false,
|
||
isAdmin: false,
|
||
user: {
|
||
id: null,
|
||
name: null,
|
||
url: null,
|
||
profileImage: null,
|
||
}
|
||
};
|
||
|
||
fetch('/services/internal/data/articles-getAuthenticationStatus', {
|
||
headers: {
|
||
'Accept': 'application/json'
|
||
}
|
||
})
|
||
.then(function (result) {
|
||
return result.json()
|
||
})
|
||
.then(function (result) {
|
||
const res = result.result.data
|
||
if (!res.authenticated) {
|
||
unauthenticatedBlock.classList.add('shown')
|
||
} else {
|
||
authenticated.user.id = res.id;
|
||
authenticated.user.name = res.realName;
|
||
authenticated.user.url = res.profileUrl;
|
||
authenticated.user.profileImage = res.avatar;
|
||
authenticated.user.jobTitle = res.jobTitle;
|
||
authenticated.user.companyName = res.companyName;
|
||
|
||
bindProps('#header-username', null, null, (res.firstName || res.username), null)
|
||
bindProps('#header-avatar', null, res.avatar, null, null)
|
||
bindProps('#header-user-plug', res.profileUrl, null, res.realName, null)
|
||
bindProps('#header-user-edit', '/users/' + res.id + '/edit.html', null, null, null)
|
||
bindProps('#header-dropdown-manage-email', '/newsletters/' + res.id + '/manage.html', null, null, null)
|
||
bindProps('#dropdown-view-profile', res.profileUrl, null, null, null)
|
||
bindProps('#drafts-link', '/users/' + res.id + '/drafts.html', null, null, null)
|
||
|
||
if (res.isAdmin) {
|
||
// Construct backwards so the #after call places elements in the correct order
|
||
const firstUserAction = document.querySelector('#first-user-action')
|
||
const adminConsoleItem = document.createElement('li')
|
||
const adminConsoleLink = createLink('/dzone/staff/index.html', 'Admin Console')
|
||
adminConsoleItem.appendChild(adminConsoleLink)
|
||
firstUserAction.after(adminConsoleItem)
|
||
|
||
const moderationItem = document.createElement('li')
|
||
const moderationLink = createLink('/moderation/list.html', 'Moderation')
|
||
moderationItem.appendChild(moderationLink)
|
||
firstUserAction.after(moderationItem)
|
||
|
||
const bountyModerationItem = document.createElement('li')
|
||
const bountyModerationLink = createLink('/moderation/bounties', 'Bounty Moderation')
|
||
bountyModerationItem.appendChild(bountyModerationLink)
|
||
firstUserAction.after(bountyModerationItem)
|
||
}
|
||
|
||
authenticated.isAuthenticated = res.authenticated;
|
||
authenticated.isAdmin = res.isAdmin;
|
||
|
||
authenticatedBlock.classList.add('shown')
|
||
}
|
||
}).catch(function (result) {
|
||
console.error(result)
|
||
})
|
||
|
||
/**
|
||
* Binds different properties to the selected element.
|
||
*
|
||
* @param selector - Selector to select the element
|
||
* @param href - href attribute value
|
||
* @param src - src attribute value
|
||
* @param innerHTML - innerHTML property value
|
||
* @param innerText - innerText property value
|
||
*/
|
||
function bindProps(selector, href, src, innerHTML, innerText) {
|
||
const element = document.querySelector(selector)
|
||
if (element) {
|
||
if (href) element.href = href
|
||
if (src) element.src = src
|
||
if (innerHTML) element.innerHTML = innerHTML
|
||
if (innerText) element.innerText = innerText
|
||
}
|
||
}
|
||
|
||
/**
|
||
* Creates a new link element.
|
||
*
|
||
* @param href - href attribute value
|
||
* @param innerText - innerText property value
|
||
* @returns {HTMLAnchorElement} The generated link element
|
||
*/
|
||
function createLink(href, innerText) {
|
||
const link = document.createElement('a')
|
||
link.href = href
|
||
link.innerText = innerText
|
||
|
||
return link
|
||
}
|
||
</script><script>
|
||
const userHeader = document.querySelector('#user-header')
|
||
const userDropdown = document.querySelector('#user-dropdown')
|
||
const postDropdown = document.querySelector('#post-button')
|
||
const postMenu = document.querySelector('#post-menu')
|
||
|
||
let userDropdownOpen = false
|
||
let postDropdownOpen = false
|
||
|
||
document.addEventListener('click', function(event) {
|
||
if (postDropdown && postDropdown.contains(event.target)) {
|
||
setUserDropdown(false)
|
||
setPostDropdown(!postDropdownOpen)
|
||
} else if (userHeader && userHeader.contains(event.target)) {
|
||
setPostDropdown(false)
|
||
setUserDropdown(!userDropdownOpen)
|
||
} else {
|
||
setUserDropdown(false)
|
||
setPostDropdown(false)
|
||
}
|
||
})
|
||
|
||
function setUserDropdown(value) {
|
||
userDropdownOpen = value
|
||
if (userDropdownOpen) {
|
||
if (userDropdown) {
|
||
userDropdown.classList.add('open')
|
||
}
|
||
} else {
|
||
if (userDropdown) {
|
||
userDropdown.classList.remove('open')
|
||
}
|
||
}
|
||
}
|
||
|
||
function setPostDropdown(value) {
|
||
postDropdownOpen = value
|
||
if (postDropdownOpen) {
|
||
if (postMenu) {
|
||
postMenu.classList.add('open')
|
||
}
|
||
} else {
|
||
if (postMenu) {
|
||
postMenu.classList.remove('open')
|
||
}
|
||
}
|
||
}
|
||
</script><script>
|
||
document.addEventListener("alpine:init", () => {
|
||
Alpine.store('global', {
|
||
executeHttp(path, body, method) {
|
||
const options = {
|
||
method: method,
|
||
headers: {
|
||
[csrf.header]: csrf.token
|
||
}
|
||
};
|
||
|
||
if (method !== 'GET') {
|
||
options.body = JSON.stringify(body);
|
||
options.headers = {
|
||
...options.headers,
|
||
'Content-Type': 'application/json; charset=UTF-8'
|
||
};
|
||
}
|
||
|
||
return new Promise((resolve, reject) => {
|
||
fetch(path, options)
|
||
.then(res => {
|
||
if (!res.ok) {
|
||
reject(res);
|
||
} else {
|
||
resolve(res);
|
||
}
|
||
})
|
||
.catch(err => reject(err));
|
||
});
|
||
},
|
||
getFromService(path) {
|
||
return this.executeHttp(path, null, 'GET');
|
||
},
|
||
postToService(path, body = {}) {
|
||
return this.executeHttp(path, body, 'POST');
|
||
},
|
||
putToService(path, body = {}) {
|
||
return this.executeHttp(path, body, 'PUT');
|
||
}
|
||
});
|
||
});
|
||
</script>
|
||
<link rel="stylesheet" media="all" href="https://dz2cdn1.dzone.com/themes/dz20/ftl/colors.css">
|
||
<link rel="stylesheet" media="all" href="https://dz2cdn1.dzone.com/themes/dz20/ftl/article/styles.css">
|
||
|
||
|
||
|
||
|
||
|
||
<div id="body-container">
|
||
<div id="announcement-container-outer">
|
||
<div id="announcement-previous">
|
||
<i class="icon-angle-left"></i>
|
||
</div>
|
||
<div id="announcement-next">
|
||
<i class="icon-angle-right"></i>
|
||
</div>
|
||
<div id="announcement-container">
|
||
<div class="announcement announcement-count-1"
|
||
data-position="1">
|
||
<div class="body"><p><strong>Could your team report a vulnerability within 24 hours? </strong>Find out on September 23.</p></div>
|
||
<div class="spacer"></div>
|
||
<a href="https://cvent.me/O32zXR?utm_source=Announcements&utm_medium=DzoneWeb&utm_campaign=QtGroup-0923" target="_blank">
|
||
<button>Assess Your CRA Readiness</button>
|
||
</a>
|
||
</div>
|
||
</div>
|
||
</div>
|
||
<script type="text/javascript" async>
|
||
(function() {
|
||
let announcementPosition = 1;
|
||
let minAnnouncementPosition = -1;
|
||
let maxAnnouncementPosition = -1;
|
||
|
||
const announcementPrevBtn = document.querySelector('#announcement-previous');
|
||
const announcementNextBtn = document.querySelector('#announcement-next');
|
||
|
||
function withAnnouncements(callback) {
|
||
const announcements = document.querySelectorAll('#announcement-container .announcement');
|
||
for (let announcement of announcements) {
|
||
callback(announcement);
|
||
}
|
||
}
|
||
|
||
function initAnnouncementVars() {
|
||
document.querySelector(':root').style.setProperty('--mobile-announcement-separator-width', '1px');
|
||
withAnnouncements(function(announcement) {
|
||
const pos = parseInt(announcement.getAttribute('data-position'));
|
||
minAnnouncementPosition = minAnnouncementPosition === -1 ? pos : Math.min(minAnnouncementPosition, pos);
|
||
maxAnnouncementPosition = maxAnnouncementPosition === -1 ? pos : Math.max(maxAnnouncementPosition, pos);
|
||
});
|
||
|
||
if (document.querySelector('.announcementBarContainer')) {
|
||
document.querySelector(':root').style.setProperty('--body-top-padding', '0');
|
||
}
|
||
|
||
if (maxAnnouncementPosition <= 0) {
|
||
document.querySelector(':root').style.setProperty('--body-top-padding', '0');
|
||
}
|
||
|
||
sizeToFullWhenOneEntryOnMobile();
|
||
}
|
||
|
||
function setAnnouncementPosition(position) {
|
||
if (window.outerWidth >= 890) {
|
||
return; // we do not need to change the position, since we can display everything on desktop.
|
||
}
|
||
|
||
// Make the announcement cyclical
|
||
if (minAnnouncementPosition !== -1 && maxAnnouncementPosition !== -1) {
|
||
if (position > maxAnnouncementPosition) {
|
||
position = minAnnouncementPosition; // overflow to the first announcement
|
||
} else if (position < minAnnouncementPosition) {
|
||
position = maxAnnouncementPosition; // underflow to the last announcement
|
||
}
|
||
announcementPosition = position;
|
||
}
|
||
|
||
const shownAnnouncements = [];
|
||
|
||
let reverseFlex = false; // should only be true when the first and last items are showing
|
||
|
||
// Now that the position is valid, apply the transforms
|
||
withAnnouncements(function(announcement) {
|
||
const pos = parseInt(announcement.getAttribute('data-position'));
|
||
const isWrapped = position === maxAnnouncementPosition && pos === minAnnouncementPosition; // showing first + last at same time
|
||
const doesNextQualify = window.outerWidth >= 500 && (pos === position + 1 || isWrapped);
|
||
|
||
if (pos === position || doesNextQualify) {
|
||
shownAnnouncements.push(announcement);
|
||
} else {
|
||
announcement.style.display = 'none';
|
||
}
|
||
|
||
announcement.style.opacity = 0.0;
|
||
|
||
if (isWrapped) {
|
||
reverseFlex = true;
|
||
}
|
||
});
|
||
|
||
for (let announcement of shownAnnouncements) {
|
||
announcement.style.display = 'flex';
|
||
announcement.style.opacity = 1.0;
|
||
}
|
||
|
||
const announcementContainer = document.querySelector('#announcement-container');
|
||
if (announcementContainer) {
|
||
announcementContainer.style.flexDirection = reverseFlex ? 'row-reverse' : 'row';
|
||
}
|
||
}
|
||
|
||
function resetAnnouncements() {
|
||
announcementPosition = 1;
|
||
const announcementContainer = document.querySelector('#announcement-container');
|
||
if (announcementContainer) {
|
||
announcementContainer.style.flexDirection = 'row';
|
||
}
|
||
withAnnouncements(function(announcement) {
|
||
announcement.style.opacity = 1.0;
|
||
announcement.style.display = 'flex';
|
||
});
|
||
}
|
||
|
||
function sizeToFullWhenOneEntryOnMobile() {
|
||
if (maxAnnouncementPosition <= 2 && announcementPrevBtn && announcementNextBtn) {
|
||
announcementPrevBtn.style.display = maxAnnouncementPosition === 2 && window.outerWidth < 500 ? 'flex' : 'none';
|
||
announcementNextBtn.style.display = maxAnnouncementPosition === 2 && window.outerWidth < 500 ? 'flex' : 'none';
|
||
}
|
||
if (maxAnnouncementPosition === 1 && window.outerWidth >= 500 && window.outerWidth < 890) {
|
||
document.querySelector(':root').style.setProperty('--mobile-announcement-separator-width', '0');
|
||
document.querySelector('#announcement-container .announcement').style.maxWidth = '100%';
|
||
}
|
||
}
|
||
|
||
function resetAnnouncementsOnResize() {
|
||
announcementPosition = 1; // we want to reset the announcement position every resize
|
||
if (window.outerWidth >= 890) { // 4 announcements can be shown (215px * 4) + separator padding
|
||
resetAnnouncements();
|
||
} else { // if we're still on mobile, set the position to normalize things after resize
|
||
setAnnouncementPosition(announcementPosition);
|
||
sizeToFullWhenOneEntryOnMobile();
|
||
}
|
||
}
|
||
|
||
window.addEventListener('resize', resetAnnouncementsOnResize);
|
||
|
||
initAnnouncementVars();
|
||
setAnnouncementPosition(announcementPosition); // sets the min & max positions as well as initializes transforms
|
||
|
||
if (announcementPrevBtn) {
|
||
announcementPrevBtn.onclick = function() {
|
||
setAnnouncementPosition(announcementPosition - 1);
|
||
};
|
||
}
|
||
|
||
if (announcementNextBtn) {
|
||
announcementNextBtn.onclick = function() {
|
||
setAnnouncementPosition(announcementPosition + 1);
|
||
};
|
||
}
|
||
})(); </script>
|
||
<div id="ftl-article" class="trending-article-body">
|
||
<aside class="trending-sidebar" aria-labelledby="related-sidebar-heading">
|
||
<div class="trending">
|
||
<h2 id="related-sidebar-heading">Related</h2>
|
||
<div class="trending-separator"></div>
|
||
<ul>
|
||
<li class="item">
|
||
<a href="/articles/intro-to-distributed-system-patterns-in-spring-boot" class="related-link">How to Implement Specific Distributed System Patterns Using Spring Boot: Introduction</a>
|
||
</li>
|
||
<li class="item">
|
||
<a href="/articles/distributed-systems-common-pitfalls-and-complexity" class="related-link">Distributed Systems: Common Pitfalls and Complexity</a>
|
||
</li>
|
||
<li class="item">
|
||
<a href="/articles/gossips-on-cryptography-part-3" class="related-link">Gossip on Cryptography: Part 3</a>
|
||
</li>
|
||
<li class="item">
|
||
<a href="/articles/data-contracts-circuit-breaker" class="related-link">Data Contracts as the "Circuit Breaker" for Model Reliability</a>
|
||
</li>
|
||
</ul>
|
||
</div>
|
||
</aside>
|
||
<div class="container-fluid body trending-article-fluid">
|
||
<div class="row">
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"articleBody": "“Insanity is doing the same thing over and over again, but expecting different results” - Source unknown As you can see in the quote above, humans have this tendency to retry things even when results are not going to change. This was manifested in systems designs as well where we pushed these biases when designing systems. If you look closely there are two broad categories of failures: Cases where retry makes senseWhere retries don’t make sense In the first category, transient failures like network glitches or intermittent service overloads are examples for which retrying makes sense. For the second, where the failure originates from something like the request itself is malformed, requests are getting throttled (429s), or service is load-shedding (5xx), it doesn’t make much sense to retry. While both of these categories need special attention and appropriate handling, in this article, we will primarily focus on category 1, where it makes sense to retry. The Case for Retries In the modern world, a typical customer-facing service is made up of various microservices. A customer query to a server goes through a complex call graph and typically deals with many services. On a happy day, a single customer query meets no error (or independent failure) to give an illusion of a successful call event. For example, a service that is dependent on 5 services with 99.99% availability, can only achieve a max of 99.95% of availability (reference doc) for its callers. The key point here is that even though each individual dependency has an excellent availability of 99.99%, the cumulative effect of depending on 5 such services results in a lower overall availability for the main service. This is because the probability of all 5 dependencies succeeding on a single request is the product of their individual probabilities. Overall Availability = 1 - (1 - Individual Availability) ^ (# of Dependencies) Now, by using the same formula, we can see that to maintain a 99.99% availability at the main service without any retries, all the dependencies need to have an availability higher than 99.998%. So, this begs a question: how do you achieve 99.99% availability at the main service? The answer is we need retries! Retries Sweet Spot We discussed above that the maximum availability that you can achieve without retries is 99.95% with those 5 dependencies. Now, if we expand our above formula and try to model the overall availability to 99.99% of the main service, it will include retries as a factor in considering it. So, the formula becomes: Overall Availability = 1 - (1 - Individual Availability) ^ (# of Dependencies + # of Retries) If you plug these values, it gives you 99.99% = 1 - (1 - 0.9999) ^ (5 + Number of Retries). This gives you # of retries = 2, which means that by adding two retries at the main service, you will be able to achieve 99.99% availability. This demonstrates how retries can be an effective strategy to overcome the effect of cumulative availability reduction when relying on multiple dependencies and help achieve the desired overall service-level objectives. This is great and obvious! So why this article!? Retry Storm and Call Escalation While these retries help, they also bring trouble with them. The main problem with retries is when one of the services you depend on is in trouble or having a bad day. Now when you retry when it's already down, it is like you are kicking it where it hurts! — potentially delaying the service’s recovery. Now think of a scenario where this call graph is multi-level deep; for example, the main service depends on 5 sub-services which in turn depend on another 5 services. Now when there is a failure, you retry at the top, and this will lead to 5 * 5 = 25 retries. What if those are further dependent on 5 services? So for one retry at the top, you may end up with 5 * 5 * 5 retries, and so on. While retries don’t help with faster recovery, they can take down the service that was operating partially with this extra generated load. Now, when those fail, they further increase the failure leading to more failures and this retry storm starts and creates long-lasting outages. At the lowest level, the call volume reaches 2 ^ N, which is catastrophic and would have recovered much faster had there been no retries at all. This brings us to the meat of the article where we say we like retries, but they are also dangerous if not done right. So, how can we do it right? Strategies for Limiting Retries To benefit from retries while keeping the retry storms and cascading failures from happening, we need a way to stop the excessive retries. As highlighted above, even a single retry at the top can cause too much damage when the call graph is deep (2 ^ N). We need to limit retries in aggregate. These are some of the practical tips on how this can be done: Bounded Retries The idea with the bounded retries is that you have an upper bound in how many retries you can do. The upper bound can be decided based on the time; for example, every minute you can make 10 retries or it’s based on the success rate for every 1000 success calls, you give service a single retry credit and you keep getting until you reach the fixed upper bound. Circuit Breaking The philosophy of the circuit-breaking technique is to don’t hammer whats already down. With the circuit breaker pattern, what you do is when you meet an error, you close the connection, stop making calls to the server, and give it breathing room. To check for the recovery, you have a thread that makes a single invoke to the service on a periodic basis to check if it has recovered. Once it has recovered, you gradually start the traffic and go back to normal operation mode. This gives the receiving service the much-needed time to recover. This topic is covered in much detail in Martin Fowler’s article. Retry Strategies There are techniques in TCP congestion control like AIMD (Additive Increase and Multiplicative decrease) that can be employed. AIMD basically says that you slowly increase the traffic to a service (think of it like connection + 1), but you immediately reduce the traffic when faced with an error (think of it like active Connection / 2). You keep doing that till you equilibrium. Exponential backoff is another technique where you back off for a period of time upon meeting an error and subsequently increase the time you back off up to some maximum time. The subsequent increase is generally like 1, 2, 4, 8.. 2^retryCount, but could also be Fibonacci-based like 1,2,3,5,8…. There is another gotcha while retrying, which is to keep the jitter in mind. Here is a great article from Marc Brooker who goes into more depth about exponential backoff and retries. While these techniques talk about client-side protection, we could also employ some guardrails on the server side. Some of the things that we can consider are: Explicit backpressure contract: When under load, reject caller request and pass on the metadata that you are failing because of overload and ask it to pass to its upstream and so on. Avoid wastage work: In the case where you expect service to be under load, avoid doing wastage work. You can check whose caller has timed out and don’t need an answer to drop the work altogether. Load shedding: When under stress, load shed aggressively. Investigate in mechanism where you can identify duplicate requests and discard one of them. Use signals like CPU, memory, etc. to compliment the load-shedding decision-making. Conclusion In distributed systems, transient failures in remote interactions are unavoidable. To build higher availability systems, we rely on retries. Retries can lead to big outages because of call escalations. Clients can adopt various approaches to avoid overloading the system in case of failures. Services should also employ techniques to protect themselves in case a client goes rogue. Disclaimer The guidance provided here offers principles and practices that could broadly improve the reliability of services in many conditions. However, I would advise that you do not view this as a one-size-fits-all mandate. Instead, I suggest that you and your team evaluate these recommendations through the lens of your specific needs and circumstances.",
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<p>Retries help increase service availability. However, if not done right, they can have a devastating impact on the service and elongate recovery time.</p>
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<a href="/users/3032743/rajesh0708.html" rel="nofollow" data-core-user="false">Rajesh Kumar Pandey</a>
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<p><em>“Insanity is doing the same thing over and over again, but expecting different results” - Source unknown</em></p>
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</blockquote>
|
||
<p>As you can see in the quote above, humans have this tendency to retry things even when results are not going to change. This was manifested in systems designs as well where we pushed these biases when designing systems. If you look closely there are two broad categories of failures: </p>
|
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<ol>
|
||
<li>Cases where retry makes sense</li>
|
||
<li>Where retries don’t make sense</li>
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</ol>
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||
<p>In the first category, transient failures like network glitches or intermittent service overloads are examples for which retrying makes sense. For the second, where the failure originates from something like the request itself is malformed, requests are getting throttled (429s), or service is load-shedding (5xx), it doesn’t make much sense to retry.</p>
|
||
<p>While both of these categories need special attention and appropriate handling, in this article, we will primarily focus on category 1, where it makes sense to retry.</p>
|
||
<h2>The Case for Retries</h2>
|
||
<p>In the modern world, a typical customer-facing service is made up of <a href="https://dzone.com/articles/microservices-orchestration">various microservices</a>. A customer query to a server goes through a complex call graph and typically deals with many services. On a happy day, a single customer query meets no error (or independent failure) to give an illusion of a successful call event.</p>
|
||
<p>For example, a service that is dependent on 5 services with 99.99% availability, can only achieve a max of 99.95% of availability (<a href="https://queue.acm.org/detail.cfm?id=3096459" rel="noopener noreferrer" target="_blank">reference doc</a>) for its callers. The key point here is that even though each individual dependency has an excellent availability of 99.99%, the cumulative effect of depending on 5 such services results in a lower overall availability for the main service. This is because the probability of all 5 dependencies succeeding on a single request is the product of their individual probabilities.</p>
|
||
<blockquote>
|
||
<p>Overall Availability =<br>
|
||
1 - (1 - Individual Availability) ^ (# of Dependencies)</p>
|
||
</blockquote>
|
||
<p>Now, by using the same formula, we can see that to maintain a 99.99% availability at the main service without any retries, all the dependencies need to have an availability higher than 99.998%. So, this begs a question: how do you achieve 99.99% availability at the main service? The answer is we need retries! </p>
|
||
<h2><strong>Retries Sweet Spot</strong></h2>
|
||
<p>We discussed above that the maximum availability that you can achieve without retries is 99.95% with those 5 dependencies. Now, if we expand our above formula and try to model the overall availability to 99.99% of the main service, it will include retries as a factor in considering it. So, the formula becomes:</p>
|
||
<blockquote>
|
||
<p>Overall Availability =<br>
|
||
1 - (1 - Individual Availability) ^ (# of Dependencies + # of Retries)</p>
|
||
</blockquote>
|
||
<p>If you plug these values, it gives you 99.99% = 1 - (1 - 0.9999) ^ (5 + Number of Retries).</p>
|
||
<p>This gives you # of retries = 2, which means that by adding two retries at the main service, you will be able to achieve 99.99% availability.</p>
|
||
<p>This demonstrates how retries can be an effective strategy to overcome the effect of cumulative availability reduction when relying on multiple dependencies and help achieve the desired overall service-level objectives. This is great and obvious! So why this article!?</p>
|
||
<h2><strong>Retry Storm and Call Escalation</strong></h2>
|
||
<p>While these retries help, they also bring trouble with them. The main problem with retries is when one of the services you depend on is in trouble or having a bad day. Now when you retry when it's already down, it is like you are <strong><em>kicking it where it hurts</em></strong>! — potentially delaying the service’s recovery. </p>
|
||
<p>Now think of a scenario where this call graph is multi-level deep; for example, the main service depends on 5 sub-services which in turn depend on another 5 services. Now when there is a failure, you retry at the top, and this will lead to 5 * 5 = 25 retries. What if those are further dependent on 5 services? So for one retry at the top, you may end up with 5 * 5 * 5 retries, and so on. While retries don’t help with faster recovery, they can take down the service that was operating partially with this extra generated load. Now, when those fail, they further increase the failure leading to more failures and this retry storm starts and creates long-lasting outages. At the lowest level, the call volume reaches 2 ^ N, which is catastrophic and would have recovered much faster had there been no retries at all. </p>
|
||
<p>This brings us to the meat of the article where we say we like retries, but they are also dangerous if not done right. So, how can we do it right?</p>
|
||
<h2><strong>Strategies for Limiting Retries</strong></h2>
|
||
<p>To benefit from retries while keeping the retry storms and cascading failures from happening, we need a way to stop the excessive retries. As highlighted above, even a single retry at the top can cause too much damage when the call graph is deep (2 ^ N). We need to limit retries in aggregate. These are some of the practical tips on how this can be done:</p>
|
||
<h3><strong>Bounded Retries</strong></h3>
|
||
<p>The idea with the bounded retries is that you have an upper bound in how many retries you can do. The upper bound can be decided based on the time; for example, every minute you can make 10 retries or it’s based on the success rate for every 1000 success calls, you give service a single retry credit and you keep getting until you reach the fixed upper bound.</p>
|
||
<h3><strong>Circuit Breaking</strong></h3>
|
||
<p>The philosophy of the <a href="https://dzone.com/articles/introduction-to-the-circuit-breaker-pattern">circuit-breaking technique</a> is to don’t hammer whats already down. With the circuit breaker pattern, what you do is when you meet an error, you close the connection, stop making calls to the server, and give it breathing room. To check for the recovery, you have a thread that makes a single invoke to the service on a periodic basis to check if it has recovered. Once it has recovered, you gradually start the traffic and go back to normal operation mode. This gives the receiving service the much-needed time to recover. This topic is covered in much detail in <a href="https://martinfowler.com/bliki/CircuitBreaker.html" rel="noopener noreferrer" target="_blank">Martin Fowler’s article</a>.</p>
|
||
<h3><strong>Retry Strategies</strong></h3>
|
||
<p>There are techniques in TCP congestion control like AIMD (Additive Increase and Multiplicative decrease) that can be employed. AIMD basically says that you slowly increase the traffic to a service (think of it like connection + 1), but you immediately reduce the traffic when faced with an error (think of it like active Connection / 2). You keep doing that till you equilibrium. </p>
|
||
<p><a href="https://dzone.com/articles/understanding-retry-pattern-with-exponential-back">Exponential backoff</a> is another technique where you back off for a period of time upon meeting an error and subsequently increase the time you back off up to some maximum time. The subsequent increase is generally like 1, 2, 4, 8.. 2^retryCount, but could also be Fibonacci-based like 1,2,3,5,8…. There is another gotcha while retrying, which is to keep the jitter in mind. <a href="https://aws.amazon.com/blogs/architecture/exponential-backoff-and-jitter/" rel="noopener noreferrer" target="_blank">Here is a great article from Marc Brooker</a> who goes into more depth about exponential backoff and retries.</p>
|
||
<p>While these techniques talk about client-side protection, we could also employ some guardrails on the server side. Some of the things that we can consider are: </p>
|
||
<ul>
|
||
<li><strong>Explicit backpressure contract:</strong> When under load, reject caller request and pass on the metadata that you are failing because of overload and ask it to pass to its upstream and so on. </li>
|
||
<li><strong>Avoid wastage work:</strong> In the case where you expect service to be under load, avoid doing wastage work. You can check whose caller has timed out and don’t need an answer to drop the work altogether. </li>
|
||
<li><strong>Load shedding:</strong> When under stress, load shed aggressively. Investigate in mechanism where you can identify duplicate requests and discard one of them. Use signals like CPU, memory, etc. to compliment the load-shedding decision-making. </li>
|
||
</ul>
|
||
<h2><strong>Conclusion</strong></h2>
|
||
<p>In <a href="https://dzone.com/articles/demystifying-distributed-systems-a-beginners-guide">distributed systems</a>, transient failures in remote interactions are unavoidable. To build higher availability systems, we rely on retries. Retries can lead to big outages because of call escalations. Clients can adopt various approaches to avoid overloading the system in case of failures. Services should also employ techniques to protect themselves in case a client goes rogue.</p>
|
||
<h3><strong>Disclaimer</strong></h3>
|
||
<p>The guidance provided here offers principles and practices that could broadly improve the reliability of services in many conditions. However, I would advise that you do not view this as a one-size-fits-all mandate. Instead, I suggest that you and your team evaluate these recommendations through the lens of your specific needs and circumstances.</p></div>
|
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<span class="article-tag-pill">Call graph</span>
|
||
<span class="article-tag-pill">Exponential backoff</span>
|
||
<span class="article-tag-pill">HTTPS</span>
|
||
<span class="article-tag-pill">Circuit Breaker Pattern</span>
|
||
<span class="article-tag-pill">Distributed Computing</span>
|
||
</div>
|
||
|
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|
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<p>Opinions expressed by DZone contributors are their own.</p>
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<a href="/articles/intro-to-distributed-system-patterns-in-spring-boot" class="goto-link related-link">How to Implement Specific Distributed System Patterns Using Spring Boot: Introduction</a>
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<a href="/articles/distributed-systems-common-pitfalls-and-complexity" class="goto-link related-link">Distributed Systems: Common Pitfalls and Complexity</a>
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<a href="/articles/gossips-on-cryptography-part-3" class="goto-link related-link">Gossip on Cryptography: Part 3</a>
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<a href="/articles/data-contracts-circuit-breaker" class="goto-link related-link">Data Contracts as the "Circuit Breaker" for Model Reliability</a>
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<li class="linkedin-icon">
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rel="noreferrer noopener">
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<div class="top-section col-xs-12">
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<div class="col-xs-12 col-sm-6">
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<p class="section-header">ABOUT US</p>
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<ul class="link-group">
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<li><a href="/pages/about" rel="noreferrer noopener">About DZone</a></li>
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<li><a href="/cdn-cgi/l/email-protection#186b6d6868776a6c587c6277767d367b7775" rel="noreferrer noopener">Support and feedback</a></li>
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<li><a href="/pages/dzone-community-research">Community research</a></li>
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<div class="col-xs-12 col-sm-6">
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<p class="section-header">ADVERTISE</p>
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<ul class="link-group">
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<li><a href="https://advertise.dzone.com" target="_blank" rel="noreferrer noopener">Advertise with DZone</a></li>
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<div class="col-xs-12 col-sm-6">
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<p class="section-header">CONTRIBUTE ON DZONE</p>
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<ul class="bottom-top-list link-group">
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<li><a href="/articles/dzones-article-submission-guidelines">Article Submission Guidelines</a></li>
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</ul>
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<p class="section-header">LEGAL</p>
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<ul class="link-group">
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<li><a href="https://technologyadvice.com/terms-conditions/" target="_blank" rel="noreferrer noopener">Terms of Service</a></li>
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<div class="col-xs-12 col-sm-6">
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<p class="section-header">CONTACT US</p>
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<ul class="link-group">
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<li>3343 Perimeter Hill Drive</li>
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||
<li>Suite 215</li>
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<li>Nashville, TN 37211</li>
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<li><a href="/cdn-cgi/l/email-protection#463533363629343206223c2928236825292b" rel="noreferrer noopener"><span class="__cf_email__" data-cfemail="bdcec8cdcdd2cfc9fdd9c7d2d3d893ded2d0">[email protected]</span></a></li>
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<div class="right col-xs-12 col-sm-5">
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<p class="connect-text">Let's be friends:</p>
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<div class="col-xs-12 social-media-icons footer-wide">
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<ul class="icons-only">
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<li class="rss-icon" id="rss-footer-1">
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<a href="/pages/feeds" target="_blank" rel="noreferrer noopener">
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<svg role="img" viewBox="0 0 24 24" aria-label="Follow our RSS feeds">
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<title>RSS</title>
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<path d="M19.199 24C19.199 13.467 10.533 4.8 0 4.8V0c13.165 0 24 10.835 24 24h-4.801zM3.291 17.415c1.814 0 3.293 1.479 3.293 3.295 0 1.813-1.485 3.29-3.301 3.29C1.47 24 0 22.526 0 20.71s1.475-3.294 3.291-3.295zM15.909 24h-4.665c0-6.169-5.075-11.245-11.244-11.245V8.09c8.727 0 15.909 7.184 15.909 15.91z"></path>
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<path d="M14.234 10.162 22.977 0h-2.072l-7.591 8.824L7.251 0H.258l9.168 13.343L.258 24H2.33l8.016-9.318L16.749 24h6.993zm-2.837 3.299-.929-1.329L3.076 1.56h3.182l5.965 8.532.929 1.329 7.754 11.09h-3.182z"></path>
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rel="noreferrer noopener">
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}
|
||
|
||
return value;
|
||
}
|
||
|
||
function GAM_setPersistentValue(key, value, expiration) {
|
||
// 5 minutes from now
|
||
if (!expiration) {
|
||
expiration = Date.now() + 300000;
|
||
}
|
||
|
||
const storedValue = JSON.stringify({
|
||
value: value,
|
||
expiration: expiration
|
||
});
|
||
|
||
localStorage.setItem(key, storedValue);
|
||
|
||
return value;
|
||
}
|
||
|
||
function GAM_synchronousRequest(params) {
|
||
const xhr = new XMLHttpRequest();
|
||
xhr.open('GET', params.url, false);
|
||
xhr.setRequestHeader("Content-Type", "application/json");
|
||
|
||
if (typeof params.auth_header !== "undefined") {
|
||
xhr.setRequestHeader("Authorization", params.auth_header);
|
||
}
|
||
|
||
xhr.send(null);
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||
if (xhr.status === 200) {
|
||
return xhr.responseText;
|
||
} else {
|
||
throw new Error('Request failed: ' + xhr.statusText);
|
||
}
|
||
}
|
||
|
||
function GAM_fetch_data(params) {
|
||
let stored_data = GAM_getPersistentValue(params.storage_key);
|
||
|
||
if (stored_data === null) {
|
||
try {
|
||
const response = GAM_synchronousRequest(params);
|
||
const data = JSON.parse(response);
|
||
|
||
// Store and expire after 30 minutes
|
||
return GAM_setPersistentValue(params.storage_key, data, Date.now() + 1800000);
|
||
} catch (error) {
|
||
console.error('Could not get ' + params.storage_key + ' data: ' + error);
|
||
return null;
|
||
}
|
||
} else {
|
||
return stored_data;
|
||
}
|
||
}
|
||
|
||
function GAM_setUpSixSenseTargeting() {
|
||
let meData = GAM_fetch_data({
|
||
url: "https://link.technologyadvice.com/_me",
|
||
storage_key: "ta_me_data"
|
||
});
|
||
let sixSenseData = GAM_fetch_data({
|
||
url: "https://epsilon.6sense.com/v3/company/details",
|
||
auth_header: "Token d20a1b0e892442270cbc4cb6801c0160d28af04c",
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||
storage_key: "ta_6s_data"
|
||
});
|
||
|
||
function meDataIncludes(i) {
|
||
return meData.tags.includes(i);
|
||
}
|
||
|
||
if (typeof meData !== "undefined" && meData !== null) {
|
||
window.googletag.pubads().setTargeting("visitor_id", meData.vid);
|
||
window.googletag.pubads().setTargeting("user_agent", meData.user_agent);
|
||
|
||
var tags_mapping = {
|
||
"is_datacenter": ["site.is-datacenter"],
|
||
"is_suspected_bot": ["site.suspected-bad-bot", "site.bad-bot"],
|
||
"is_ta_user": ["site.is-ta-user"],
|
||
"is_crawler": ["site.user-agent-blocked"],
|
||
"is_ad_blocked": ["site.is-ad-blocked"],
|
||
};
|
||
|
||
for (var key in tags_mapping) {
|
||
if (tags_mapping[key].some(meDataIncludes)) {
|
||
window.googletag.pubads().setTargeting(key, 'true');
|
||
}
|
||
}
|
||
}
|
||
|
||
if (typeof sixSenseData !== "undefined" && sixSenseData !== null) {
|
||
var segment_ids = [];
|
||
if (sixSenseData.segments && sixSenseData.segments.ids && sixSenseData.segments.ids.length) {
|
||
sixSenseData.segments.ids.forEach(function (v) {
|
||
segment_ids.push(v.toString());
|
||
});
|
||
}
|
||
if (typeof segment_ids !== "undefined" && segment_ids.length > 0) {
|
||
window.googletag.pubads().setTargeting("segment_ids_6si", segment_ids);
|
||
}
|
||
}
|
||
}
|
||
|
||
if (width >= 1024 && (topContainer || bottomContainer)) {
|
||
// Dynamically create bumper ad slots for non-mobile devices.
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||
// Prevents ugly dividers being rendered on empty ad slots (mobile)
|
||
const topBumper = document.createElement('div');
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||
topBumper.id = 'div-gpt-ad-1435246566686-3';
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||
topBumper.classList.add('article-bumper', 'article-bumper-top', 'dz2_bumper_text_ad');
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||
topBumper.setAttribute('data-gpt-slot', 'topBumper');
|
||
|
||
topContainer.appendChild(topBumper);
|
||
|
||
const bottomBumper = document.createElement('div');
|
||
bottomBumper.id = 'div-gpt-ad-1435246566686-4';
|
||
bottomBumper.classList.add('article-bumper', 'article-bumper-bottom', 'dz2_bumper_text_ad');
|
||
bottomBumper.setAttribute('data-gpt-slot', 'bottomBumper');
|
||
|
||
bottomContainer.appendChild(bottomBumper);
|
||
}
|
||
|
||
if (gptTags.zone) {
|
||
gptTags.zone = gptTags.zone.replaceAll(/[\s/]/g, '_')
|
||
.replaceAll(/[^a-zA-Z0-9_]/g, '')
|
||
.toLowerCase();
|
||
}
|
||
|
||
makeAds();
|
||
|
||
function handleSkybox() {
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||
const skybox = document.querySelector('div.skybox');
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||
if (skybox) {
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||
document.body.classList.add('skybox-auto-collapse');
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||
// observe classlist changes for offsetting sticky ads
|
||
const observer = new MutationObserver((mutations) => {
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||
mutations.forEach((mutation) => {
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||
if (mutation.type === 'attributes' && mutation.attributeName === 'class') {
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||
let offset = 0;
|
||
if (!document.body.classList.contains('skybox-closed') && (
|
||
document.body.classList.contains('ccad-skybox-manualcollapse')
|
||
|| document.body.classList.contains('ccad-skybox-manualexpand')
|
||
)) {
|
||
offset = skybox.getBoundingClientRect().height;
|
||
}
|
||
let eligibleAds = [
|
||
{ element: document.querySelector('.content-right-images'), offset: 108 },
|
||
{ element: document.querySelector('.trending-sidebar'), offset: 88 },
|
||
{ element: document.querySelector('.trending'), offset: 88 }
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||
];
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||
for (let ad of eligibleAds) {
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||
if (ad.element) {
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||
ad.element.style.top = (ad.offset + offset) + 'px';
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||
}
|
||
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|
||
}
|
||
});
|
||
});
|
||
observer.observe(document.body, { attributes: true });
|
||
}
|
||
}
|
||
|
||
function isHeaderEligible(header) {
|
||
const range = document.createRange();
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||
range.setStartAfter(lastHeader);
|
||
range.setEndBefore(header);
|
||
|
||
return range.toString().trim().length >= 600;
|
||
}
|
||
|
||
function placeInlineAds() {
|
||
const excludedContent = document.querySelectorAll('#ftl-article.branded-content, #ftl-article.sponsored');
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||
|
||
if (excludedContent.length > 0) {
|
||
return;
|
||
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|
||
|
||
const headers = Array.from(document.querySelectorAll('.content-html h2')).splice(1);
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||
|
||
let globalIndex = 12;
|
||
|
||
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|
||
if (!lastHeader || isHeaderEligible(headers[i])) {
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||
const element = document.createElement('div');
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||
element.id = 'div-gpt-ad-1435246566686-' + globalIndex;
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||
element.classList.add('inline-display', 'dz2_inline-article-display');
|
||
element.setAttribute('data-gpt-slot', 'inline');
|
||
headers[i].before(element);
|
||
lastHeader = element;
|
||
globalIndex++;
|
||
}
|
||
}
|
||
}
|
||
|
||
function makeAds() {
|
||
handleSkybox();
|
||
placeInlineAds();
|
||
|
||
const script = document.createElement('script');
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||
script.src = 'https://i6ByW9Zmz4ncxhHkb.ay.delivery/manager/i6ByW9Zmz4ncxhHkb';
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||
script.type = 'text/javascript';
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||
script.referrerPolicy = 'no-referrer-when-downgrade';
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||
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||
document.head.appendChild(script);
|
||
|
||
window.googletag.cmd.push(function() {
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||
const containers = document.querySelectorAll('div[data-gpt-slot]');
|
||
|
||
for (let container of containers) {
|
||
const div = container.getAttribute('data-gpt-slot');
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||
const meta = metadata[div];
|
||
|
||
if (meta.minWidthToShow && width < meta.minWidthToShow) {
|
||
continue;
|
||
}
|
||
|
||
window.googletag.pubads().setTargeting('hostname', window.location.hostname);
|
||
|
||
Object.keys(gptTags).forEach(function(key) {
|
||
window.googletag.pubads().setTargeting(key, gptTags[key]);
|
||
});
|
||
|
||
window.googletag.pubads().addEventListener('slotRenderEnded', (event) => {
|
||
window.requestAnimationFrame(() => {
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||
var slotId = event.slot.getSlotElementId();
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||
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||
if (!slotId.includes('__ayManagerEnv__')) {
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||
return;
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||
}
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||
|
||
var className = slotId.split('__ayManagerEnv__')[0];
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||
var slotName = className.replace('dz2_', '').replace('dz_', '').replace(/_\d+$/, '');
|
||
var unitName = meta.slot.replace('dz2_', '').replace('dz_', '').replace(/_\d+$/, '');
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||
|
||
if (slotName !== unitName) {
|
||
return;
|
||
}
|
||
|
||
var elem = document.getElementById(slotId);
|
||
|
||
if (!elem) {
|
||
console.warn('Ad element missing', slotId);
|
||
return;
|
||
}
|
||
|
||
// Ad unit did not fill, collapse slot
|
||
if (event.isEmpty && elem.parentElement) {
|
||
elem.parentElement.style.display = 'none';
|
||
}
|
||
});
|
||
});
|
||
}
|
||
|
||
GAM_setUpSixSenseTargeting();
|
||
});
|
||
}
|
||
</script>
|
||
<script async>// InMobi Choice. Consent Manager Tag v3.0 (for TCF 2.2)
|
||
!function(){var e=window.location.hostname,t=document.createElement("script"),n=document.getElementsByTagName("script")[0],a="https://cmp.inmobi.com".concat("/choice/","vPn77x7pBG57Y","/","dzone.com","/choice.js?tag_version=V3"),p=0;t.async=!0,t.type="text/javascript",t.src=a,n.parentNode.insertBefore(t,n),function(){for(var e,t="__tcfapiLocator",n=[],a=window;a;){try{if(a.frames[t]){e=a;break}}catch(e){}if(a===window.top)break;a=a.parent}e||(!function e(){var n=a.document,p=!!a.frames[t];if(!p)if(n.body){var s=n.createElement("iframe");s.style.cssText="display:none",s.name=t,n.body.appendChild(s)}else setTimeout(e,5);return!p}(),a.__tcfapi=function(){var e,t=arguments;if(!t.length)return n;if("setGdprApplies"===t[0])t.length>3&&2===t[2]&&"boolean"==typeof t[3]&&(e=t[3],"function"==typeof t[2]&&t[2]("set",!0));else if("ping"===t[0]){var a={gdprApplies:e,cmpLoaded:!1,cmpStatus:"stub"};"function"==typeof t[2]&&t[2](a)}else"init"===t[0]&&"object"==typeof t[3]&&(t[3]=Object.assign(t[3],{tag_version:"V3"})),n.push(t)},a.addEventListener("message",(function(e){var t="string"==typeof e.data,n={};try{n=t?JSON.parse(e.data):e.data}catch(e){}var a=n.__tcfapiCall;a&&window.__tcfapi(a.command,a.version,(function(n,p){var s={__tcfapiReturn:{returnValue:n,success:p,callId:a.callId}};t&&(s=JSON.stringify(s)),e&&e.source&&e.source.postMessage&&e.source.postMessage(s,"*")}),a.parameter)}),!1))}(),function(){const e=["2:tcfeuv2","6:uspv1","7:usnatv1","8:usca","9:usvav1","10:uscov1","11:usutv1","12:usctv1"];window.__gpp_addFrame=function(e){if(!window.frames[e])if(document.body){var t=document.createElement("iframe");t.style.cssText="display:none",t.name=e,document.body.appendChild(t)}else window.setTimeout(window.__gpp_addFrame,10,e)},window.__gpp_stub=function(){var t=arguments;if(__gpp.queue=__gpp.queue||[],__gpp.events=__gpp.events||[],!t.length||1==t.length&&"queue"==t[0])return __gpp.queue;if(1==t.length&&"events"==t[0])return __gpp.events;var n=t[0],a=t.length>1?t[1]:null,p=t.length>2?t[2]:null;if("ping"===n)a({gppVersion:"1.1",cmpStatus:"stub",cmpDisplayStatus:"hidden",signalStatus:"not ready",supportedAPIs:e,cmpId:10,sectionList:[],applicableSections:[-1],gppString:"",parsedSections:{}},!0);else if("addEventListener"===n){"lastId"in __gpp||(__gpp.lastId=0),__gpp.lastId++;var s=__gpp.lastId;__gpp.events.push({id:s,callback:a,parameter:p}),a({eventName:"listenerRegistered",listenerId:s,data:!0,pingData:{gppVersion:"1.1",cmpStatus:"stub",cmpDisplayStatus:"hidden",signalStatus:"not ready",supportedAPIs:e,cmpId:10,sectionList:[],applicableSections:[-1],gppString:"",parsedSections:{}}},!0)}else if("removeEventListener"===n){for(var i=!1,o=0;o<__gpp.events.length;o++)if(__gpp.events[o].id==p){__gpp.events.splice(o,1),i=!0;break}a({eventName:"listenerRemoved",listenerId:p,data:i,pingData:{gppVersion:"1.1",cmpStatus:"stub",cmpDisplayStatus:"hidden",signalStatus:"not ready",supportedAPIs:e,cmpId:10,sectionList:[],applicableSections:[-1],gppString:"",parsedSections:{}}},!0)}else"hasSection"===n?a(!1,!0):"getSection"===n||"getField"===n?a(null,!0):__gpp.queue.push([].slice.apply(t))},window.__gpp_msghandler=function(e){var t="string"==typeof e.data;try{var n=t?JSON.parse(e.data):e.data}catch(e){n=null}if("object"==typeof n&&null!==n&&"__gppCall"in n){var a=n.__gppCall;window.__gpp(a.command,(function(n,p){var s={__gppReturn:{returnValue:n,success:p,callId:a.callId}};e.source.postMessage(t?JSON.stringify(s):s,"*")}),"parameter"in a?a.parameter:null,"version"in a?a.version:"1.1")}},"__gpp"in window&&"function"==typeof window.__gpp||(window.__gpp=window.__gpp_stub,window.addEventListener("message",window.__gpp_msghandler,!1),window.__gpp_addFrame("__gppLocator"))}();var s=function(){var e=arguments;typeof window.__uspapi!==s&&setTimeout((function(){void 0!==window.__uspapi&&window.__uspapi.apply(window.__uspapi,e)}),500)};if(void 0===window.__uspapi){window.__uspapi=s;var i=setInterval((function(){p++,window.__uspapi===s&&p<3?console.warn("USP is not accessible"):clearInterval(i)}),6e3)}}();
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||
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ga('require', 'GTM-TSD9TZP');
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ga('set', 'siteSpeedSampleRate', 25);
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<script async src="https://www.google-analytics.com/analytics.js"></script>
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Object.keys(analytics).forEach(function(key) {
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window.ga('set', key, analytics[key]);
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window.ga('send', 'pageview');
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<script src="https://dz2cdn1.dzone.com/themes/dz20/lib/static/jquery/jquery.min.js"></script>
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<script async src="https://dz2cdn1.dzone.com/themes/dz20/lib/static/bootstrap/bootstrap.min.js"></script>
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<script>
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function loadScript(src) {
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return new Promise(function (resolve, reject) {
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s.onload = resolve;
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s.onerror = reject;
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function loadStyle(href) {
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const link = document.createElement('link');
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link.rel = 'stylesheet';
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link.href = href;
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document.head.appendChild(link);
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function loadScriptsSync(deferred) {
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loadStyles();
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