966 lines
93 KiB
HTML
966 lines
93 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 name="viewport" content="width=device-width, initial-scale=1">
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<link rel="profile" href="http://gmpg.org/xfn/11">
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<title>Nines are not enough: meaningful metrics for clouds – the morning paper</title>
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<meta name='robots' content='max-image-preview:large' />
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<!-- Async WordPress.com Remote Login -->
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<script id="wpcom_remote_login_js">
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var wpcom_remote_login_extra_auth = '';
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function wpcom_remote_login_remove_dom_node_id( element_id ) {
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var dom_node = document.getElementById( element_id );
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if ( dom_node ) { dom_node.parentNode.removeChild( dom_node ); }
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}
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function wpcom_remote_login_remove_dom_node_classes( class_name ) {
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var dom_nodes = document.querySelectorAll( '.' + class_name );
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for ( var i = 0; i < dom_nodes.length; i++ ) {
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dom_nodes[ i ].parentNode.removeChild( dom_nodes[ i ] );
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}
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}
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function wpcom_remote_login_final_cleanup() {
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wpcom_remote_login_remove_dom_node_classes( "wpcom_remote_login_msg" );
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wpcom_remote_login_remove_dom_node_id( "wpcom_remote_login_key" );
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wpcom_remote_login_remove_dom_node_id( "wpcom_remote_login_validate" );
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wpcom_remote_login_remove_dom_node_id( "wpcom_remote_login_js" );
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wpcom_remote_login_remove_dom_node_id( "wpcom_request_access_iframe" );
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wpcom_remote_login_remove_dom_node_id( "wpcom_request_access_styles" );
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}
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// Watch for messages back from the remote login
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window.addEventListener( "message", function( e ) {
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if ( e.origin === "https://r-login.wordpress.com" ) {
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var data = {};
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try {
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data = JSON.parse( e.data );
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} catch( e ) {
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wpcom_remote_login_final_cleanup();
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return;
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}
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if ( data.msg === 'LOGIN' ) {
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// Clean up the login check iframe
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wpcom_remote_login_remove_dom_node_id( "wpcom_remote_login_key" );
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var id_regex = new RegExp( /^[0-9]+$/ );
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var token_regex = new RegExp( /^.*|.*|.*$/ );
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if (
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token_regex.test( data.token )
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&& id_regex.test( data.wpcomid )
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) {
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// We have everything we need to ask for a login
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var script = document.createElement( "script" );
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script.setAttribute( "id", "wpcom_remote_login_validate" );
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script.src = '/remote-login.php?wpcom_remote_login=validate'
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+ '&wpcomid=' + data.wpcomid
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+ '&token=' + encodeURIComponent( data.token )
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+ '&host=' + window.location.protocol
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+ '//' + window.location.hostname
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+ '&postid=8805'
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+ '&is_singular=1';
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document.body.appendChild( script );
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}
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return;
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}
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// Safari ITP, not logged in, so redirect
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if ( data.msg === 'LOGIN-REDIRECT' ) {
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window.location = 'https://wordpress.com/log-in?redirect_to=' + window.location.href;
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return;
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}
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// Safari ITP, storage access failed, remove the request
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if ( data.msg === 'LOGIN-REMOVE' ) {
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var css_zap = 'html { -webkit-transition: margin-top 1s; transition: margin-top 1s; } /* 9001 */ html { margin-top: 0 !important; } * html body { margin-top: 0 !important; } @media screen and ( max-width: 782px ) { html { margin-top: 0 !important; } * html body { margin-top: 0 !important; } }';
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var style_zap = document.createElement( 'style' );
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style_zap.type = 'text/css';
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style_zap.appendChild( document.createTextNode( css_zap ) );
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document.body.appendChild( style_zap );
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var e = document.getElementById( 'wpcom_request_access_iframe' );
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e.parentNode.removeChild( e );
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document.cookie = 'wordpress_com_login_access=denied; path=/; max-age=31536000';
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return;
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}
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// Safari ITP
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if ( data.msg === 'REQUEST_ACCESS' ) {
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console.log( 'request access: safari' );
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// Check ITP iframe enable/disable knob
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if ( wpcom_remote_login_extra_auth !== 'safari_itp_iframe' ) {
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return;
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}
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// If we are in a "private window" there is no ITP.
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var private_window = false;
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try {
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var opendb = window.openDatabase( null, null, null, null );
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} catch( e ) {
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private_window = true;
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}
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if ( private_window ) {
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console.log( 'private window' );
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return;
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}
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var iframe = document.createElement( 'iframe' );
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iframe.id = 'wpcom_request_access_iframe';
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iframe.setAttribute( 'scrolling', 'no' );
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iframe.setAttribute( 'sandbox', 'allow-storage-access-by-user-activation allow-scripts allow-same-origin allow-top-navigation-by-user-activation' );
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iframe.src = 'https://r-login.wordpress.com/remote-login.php?wpcom_remote_login=request_access&origin=' + encodeURIComponent( data.origin ) + '&wpcomid=' + encodeURIComponent( data.wpcomid );
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var css = 'html { -webkit-transition: margin-top 1s; transition: margin-top 1s; } /* 9001 */ html { margin-top: 46px !important; } * html body { margin-top: 46px !important; } @media screen and ( max-width: 660px ) { html { margin-top: 71px !important; } * html body { margin-top: 71px !important; } #wpcom_request_access_iframe { display: block; height: 71px !important; } } #wpcom_request_access_iframe { border: 0px; height: 46px; position: fixed; top: 0; left: 0; width: 100%; min-width: 100%; z-index: 99999; background: #23282d; } ';
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var style = document.createElement( 'style' );
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style.type = 'text/css';
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style.id = 'wpcom_request_access_styles';
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style.appendChild( document.createTextNode( css ) );
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document.body.appendChild( style );
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document.body.appendChild( iframe );
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}
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if ( data.msg === 'DONE' ) {
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wpcom_remote_login_final_cleanup();
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}
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}
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}, false );
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// Inject the remote login iframe after the page has had a chance to load
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// more critical resources
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window.addEventListener( "DOMContentLoaded", function( e ) {
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var iframe = document.createElement( "iframe" );
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iframe.style.display = "none";
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iframe.setAttribute( "scrolling", "no" );
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iframe.setAttribute( "id", "wpcom_remote_login_key" );
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iframe.src = "https://r-login.wordpress.com/remote-login.php"
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+ "?wpcom_remote_login=key"
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+ "&origin=aHR0cHM6Ly9ibG9nLmFjb2x5ZXIub3Jn"
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+ "&wpcomid=23592848"
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+ "&time=" + Math.floor( Date.now() / 1000 );
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document.body.appendChild( iframe );
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}, false );
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</script>
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<link rel='dns-prefetch' href='//s2.wp.com' />
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<link rel='dns-prefetch' href='//fonts-api.wp.com' />
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<link rel='dns-prefetch' href='//s1.wp.com' />
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<link rel='dns-prefetch' href='//s0.wp.com' />
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<link rel="alternate" type="application/rss+xml" title="the morning paper » Feed" href="https://blog.acolyer.org/feed/" />
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<link rel="alternate" type="application/rss+xml" title="the morning paper » Comments Feed" href="https://blog.acolyer.org/comments/feed/" />
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<link rel="alternate" type="application/rss+xml" title="the morning paper » Nines are not enough: meaningful metrics for clouds Comments Feed" href="https://blog.acolyer.org/2019/06/19/nines-are-not-enough/feed/" />
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<script type="text/javascript">
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/* <![CDATA[ */
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function addLoadEvent(func) {
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var oldonload = window.onload;
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||
if (typeof window.onload != 'function') {
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||
window.onload = func;
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||
} else {
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||
window.onload = function () {
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||
oldonload();
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||
func();
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||
}
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||
}
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||
}
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/* ]]> */
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</script>
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||
<style id="wp-img-auto-sizes-contain-inline-css">
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img:is([sizes=auto i],[sizes^="auto," i]){contain-intrinsic-size:3000px 1500px}
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/*# sourceURL=wp-img-auto-sizes-contain-inline-css */
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</style>
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<link crossorigin='anonymous' rel='stylesheet' id='all-css-2-1' href='/_static/??-eJxtjEsKgDAMBS9kjbqwuBDPUtog9o9J8fpaEQSRBw8GhoEjC50iY2QIRWRf1i0SWOSstHsYQkr1TPFIsKNXjEbkRPyhVhM18J/0m8M3fFPVlzD3UnbTtWG0J2CTNNk=&cssminify=yes' type='text/css' media='all' />
|
||
<style id="wp-emoji-styles-inline-css">
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||
|
||
img.wp-smiley, img.emoji {
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||
display: inline !important;
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border: none !important;
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||
box-shadow: none !important;
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height: 1em !important;
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||
width: 1em !important;
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margin: 0 0.07em !important;
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vertical-align: -0.1em !important;
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background: none !important;
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||
padding: 0 !important;
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||
}
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/*# sourceURL=wp-emoji-styles-inline-css */
|
||
</style>
|
||
<style id="wp-block-library-inline-css">
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||
:root{--wp-block-synced-color:#7a00df;--wp-block-synced-color--rgb:122,0,223;--wp-bound-block-color:var(--wp-block-synced-color);--wp-editor-canvas-background:#ddd;--wp-admin-theme-color:#007cba;--wp-admin-theme-color--rgb:0,124,186;--wp-admin-theme-color-darker-10:#006ba1;--wp-admin-theme-color-darker-10--rgb:0,107,160.5;--wp-admin-theme-color-darker-20:#005a87;--wp-admin-theme-color-darker-20--rgb:0,90,135;--wp-admin-border-width-focus:2px}@media (min-resolution:192dpi){:root{--wp-admin-border-width-focus:1.5px}}.wp-element-button{cursor:pointer}:root .has-very-light-gray-background-color{background-color:#eee}:root .has-very-dark-gray-background-color{background-color:#313131}:root .has-very-light-gray-color{color:#eee}:root .has-very-dark-gray-color{color:#313131}:root .has-vivid-green-cyan-to-vivid-cyan-blue-gradient-background{background:linear-gradient(135deg,#00d084,#0693e3)}:root .has-purple-crush-gradient-background{background:linear-gradient(135deg,#34e2e4,#4721fb 50%,#ab1dfe)}:root .has-hazy-dawn-gradient-background{background:linear-gradient(135deg,#faaca8,#dad0ec)}:root .has-subdued-olive-gradient-background{background:linear-gradient(135deg,#fafae1,#67a671)}:root .has-atomic-cream-gradient-background{background:linear-gradient(135deg,#fdd79a,#004a59)}:root .has-nightshade-gradient-background{background:linear-gradient(135deg,#330968,#31cdcf)}:root .has-midnight-gradient-background{background:linear-gradient(135deg,#020381,#2874fc)}:root{--wp--preset--font-size--normal:16px;--wp--preset--font-size--huge:42px}.has-regular-font-size{font-size:1em}.has-larger-font-size{font-size:2.625em}.has-normal-font-size{font-size:var(--wp--preset--font-size--normal)}.has-huge-font-size{font-size:var(--wp--preset--font-size--huge)}:root .has-text-align-center{text-align:center}:root .has-text-align-left{text-align:left}:root .has-text-align-right{text-align:right}.has-fit-text{white-space:nowrap!important}#end-resizable-editor-section{display:none}.aligncenter{clear:both}.items-justified-left{justify-content:flex-start}.items-justified-center{justify-content:center}.items-justified-right{justify-content:flex-end}.items-justified-space-between{justify-content:space-between}.screen-reader-text{word-wrap:normal!important;border:0;clip-path:inset(50%);height:1px;margin:-1px;overflow:hidden;padding:0;position:absolute;width:1px;word-break:normal!important}.screen-reader-text:focus{background-color:#ddd;clip-path:none;color:#444;display:block;font-size:1em;height:auto;left:5px;line-height:normal;padding:15px 23px 14px;text-decoration:none;top:5px;width:auto;z-index:100000}html :where(.has-border-color){border-style:solid}html :where([style^=border-color],[style*=";border-color"],[style*="; border-color"]){border-style:solid}html :where([style^=border-top-color],[style*=";border-top-color"],[style*="; border-top-color"]){border-top-style:solid}html :where([style^=border-right-color],[style*=";border-right-color"],[style*="; border-right-color"]){border-right-style:solid}html :where([style^=border-bottom-color],[style*=";border-bottom-color"],[style*="; border-bottom-color"]){border-bottom-style:solid}html :where([style^=border-left-color],[style*=";border-left-color"],[style*="; border-left-color"]){border-left-style:solid}html :where([style^=border-width],[style*=";border-width"],[style*="; border-width"]){border-style:solid}html :where([style^=border-top-width],[style*=";border-top-width"],[style*="; border-top-width"]){border-top-style:solid}html :where([style^=border-right-width],[style*=";border-right-width"],[style*="; border-right-width"]){border-right-style:solid}html :where([style^=border-bottom-width],[style*=";border-bottom-width"],[style*="; border-bottom-width"]){border-bottom-style:solid}html :where([style^=border-left-width],[style*=";border-left-width"],[style*="; border-left-width"]){border-left-style:solid}html :where(img[class*=wp-image-]){height:auto;max-width:100%}:where(figure){margin:0 0 1em}html :where(.is-position-sticky){--wp-admin--admin-bar--position-offset:var(--wp-admin--admin-bar--height,0px)}@media screen and (max-width:600px){html :where(.is-position-sticky){--wp-admin--admin-bar--position-offset:0px}}
|
||
|
||
/*# sourceURL=/wp-content/plugins/gutenberg-core/v23.9.1/build/styles/block-library/common.min.css */
|
||
</style>
|
||
<style id="wp-block-quote-inline-css">
|
||
.wp-block-quote{box-sizing:border-box;overflow-wrap:break-word}.wp-block-quote.is-large:where(:not(.is-style-plain)),.wp-block-quote.is-style-large:where(:not(.is-style-plain)){margin-bottom:1em;padding:0 1em}.wp-block-quote.is-large:where(:not(.is-style-plain)) p,.wp-block-quote.is-style-large:where(:not(.is-style-plain)) p{font-size:1.5em;font-style:italic;line-height:1.6}.wp-block-quote.is-large:where(:not(.is-style-plain)) cite,.wp-block-quote.is-large:where(:not(.is-style-plain)) footer,.wp-block-quote.is-style-large:where(:not(.is-style-plain)) cite,.wp-block-quote.is-style-large:where(:not(.is-style-plain)) footer{font-size:1.125em;text-align:right}.wp-block-quote>cite{display:block}
|
||
/*# sourceURL=/wp-content/plugins/gutenberg-core/v23.9.1/build/styles/block-library/quote/style.min.css */
|
||
</style>
|
||
<style id="wp-block-heading-inline-css">
|
||
h1:where(.wp-block-heading).has-background,h2:where(.wp-block-heading).has-background,h3:where(.wp-block-heading).has-background,h4:where(.wp-block-heading).has-background,h5:where(.wp-block-heading).has-background,h6:where(.wp-block-heading).has-background{padding:1.25em 2.375em}h1.has-text-align-left[style*=writing-mode]:where([style*=vertical-lr]),h1.has-text-align-right[style*=writing-mode]:where([style*=vertical-rl]),h2.has-text-align-left[style*=writing-mode]:where([style*=vertical-lr]),h2.has-text-align-right[style*=writing-mode]:where([style*=vertical-rl]),h3.has-text-align-left[style*=writing-mode]:where([style*=vertical-lr]),h3.has-text-align-right[style*=writing-mode]:where([style*=vertical-rl]),h4.has-text-align-left[style*=writing-mode]:where([style*=vertical-lr]),h4.has-text-align-right[style*=writing-mode]:where([style*=vertical-rl]),h5.has-text-align-left[style*=writing-mode]:where([style*=vertical-lr]),h5.has-text-align-right[style*=writing-mode]:where([style*=vertical-rl]),h6.has-text-align-left[style*=writing-mode]:where([style*=vertical-lr]),h6.has-text-align-right[style*=writing-mode]:where([style*=vertical-rl]){rotate:180deg}
|
||
/*# sourceURL=/wp-content/plugins/gutenberg-core/v23.9.1/build/styles/block-library/heading/style.min.css */
|
||
</style>
|
||
<style id="wp-block-list-inline-css">
|
||
ol,ul{box-sizing:border-box}:root :where(.wp-block-list.has-background){padding:1.25em 2.375em}
|
||
/*# sourceURL=/wp-content/plugins/gutenberg-core/v23.9.1/build/styles/block-library/list/style.min.css */
|
||
</style>
|
||
<style id="wp-block-paragraph-inline-css">
|
||
.is-small-text{font-size:.875em}.is-regular-text{font-size:1em}.is-large-text{font-size:2.25em}.is-larger-text{font-size:3em}.has-drop-cap:not(:focus):first-letter{float:left;font-size:8.4em;font-style:normal;font-weight:100;line-height:.68;margin:.05em .1em 0 0;text-transform:uppercase}body.rtl .has-drop-cap:not(:focus):first-letter{float:none;margin-left:.1em}p.has-drop-cap.has-background{overflow:hidden}:root :where(p.has-background){padding:1.25em 2.375em}:where(p.has-text-color:not(.has-link-color)) a{color:inherit}p.has-text-align-left[style*="writing-mode:vertical-lr"],p.has-text-align-right[style*="writing-mode:vertical-rl"]{rotate:180deg}
|
||
/*# sourceURL=/wp-content/plugins/gutenberg-core/v23.9.1/build/styles/block-library/paragraph/style.min.css */
|
||
</style>
|
||
<style id="wp-block-library-inline-css-extra">
|
||
.has-text-align-justify {
|
||
text-align:justify;
|
||
}
|
||
.has-text-align-justify{text-align:justify;}
|
||
/*# sourceURL=wp-block-library-inline-css */
|
||
</style>
|
||
|
||
<style id="classic-theme-styles-inline-css">
|
||
.wp-block-button__link{background-color:#32373c;border-radius:9999px;box-shadow:none;color:#fff;font-size:1.125em;padding:calc(.667em + 2px) calc(1.333em + 2px);text-decoration:none}.wp-block-file__button{background:#32373c;color:#fff}.wp-block-accordion-heading{margin:0}.wp-block-accordion-heading__toggle{background-color:inherit!important;color:inherit!important}.wp-block-accordion-heading__toggle:not(:focus-visible){outline:none}.wp-block-accordion-heading__toggle:focus,.wp-block-accordion-heading__toggle:hover{background-color:inherit!important;border:none;box-shadow:none;color:inherit;padding:var(--wp--preset--spacing--20,1em) 0;text-decoration:none}.wp-block-accordion-heading__toggle:focus-visible{outline:auto;outline-offset:0}.wp-block-tab:not(.has-text-color){color:inherit!important}.wp-block-tab:not(.has-background){background-color:inherit!important}.wp-block-tab:focus,.wp-block-tab:hover{text-decoration:none}.wp-block-tab:focus-visible{outline:auto;outline-offset:0}
|
||
/*# sourceURL=/wp-content/plugins/gutenberg-core/v23.9.1/build/styles/block-library/classic.min.css */
|
||
</style>
|
||
|
||
<style id="coblocks-inline-format-inline-css">
|
||
.uppercase{text-transform:uppercase}
|
||
/*# sourceURL=coblocks-inline-format-inline-css */
|
||
</style>
|
||
<link crossorigin='anonymous' rel='stylesheet' id='all-css-12-1' href='/_static/??-eJx9jEEOAiEQBD/kQECjeDC+ZWEnijIwYWA3/l72op689KFTVXplCCU3zE1z6reYRYfiUwlP0VYZpwxIJE4IFRd10HOU9iFA2iuhCiI7/ROiDt9WxfETT20jCOc4YUIa2D9t5eGA91xRBMZS7ATtPkTZvCtdzNEZt7f2fHq8Afl7R7w=&cssminify=yes' type='text/css' media='all' />
|
||
<style id="global-styles-inline-css">
|
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<link crossorigin='anonymous' rel='stylesheet' id='print-css-17-1' href='/wp-content/mu-plugins/global-print/global-print.css?m=1465851035i&cssminify=yes' type='text/css' media='print' />
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<header class="entry-header">
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<h1 class="entry-title">Nines are not enough: meaningful metrics for clouds</h1>
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<div class="entry-meta">
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<span class="posted-on"><a href="https://blog.acolyer.org/2019/06/19/nines-are-not-enough/" rel="bookmark"><time class="entry-date published" datetime="2019-06-19T06:00:00+01:00">June 19, 2019</time><time class="updated" datetime="2019-06-13T11:35:47+01:00">June 13, 2019</time></a></span><span class="byline"><span class="author vcard"><span class="sep"> ~ </span><a class="url fn n" href="https://blog.acolyer.org/author/adriancolyer/">adriancolyer</a></span></span> </div><!-- .entry-meta -->
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<p class="wp-block-paragraph"><a href="https://ai.google/research/pubs/pub48033">Nines are not enough: meaningful metrics for clouds</a> Mogul & Wilkes, <em>HotOS’19</em></p>
|
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|
||
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||
|
||
<p class="wp-block-paragraph">It’s hard to define good SLOs, especially when outcomes aren’t fully under the control of any single party. The authors of today’s paper should know a thing or two about that: <a href="https://ai.google/research/people/JeffreyMogul">Jeffrey Mogul</a> and <a href="https://ai.google/research/people/JohnWilkes">John Wilkes</a> at Google<sup id="fnref-8805-1"><a href="#fn-8805-1" class="jetpack-footnote">1</a></sup>! John Wilkes was also one of the co-authors of <a href="https://landing.google.com/sre/sre-book/chapters/service-level-objectives/">chapter 4</a> “Service Level Objectives” in the <a href="https://landing.google.com/sre/books/">SRE book</a>, which is good background reading for the discussion in this paper.</p>
|
||
|
||
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||
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||
<p class="wp-block-paragraph">The opening paragraph of the abstract does a great job of framing the problem:</p>
|
||
|
||
|
||
|
||
<blockquote class="wp-block-quote is-layout-flow wp-block-quote-is-layout-flow"><p>
|
||
Cloud customers want strong, understandable promises (Service Level Objectives, or SLOs) that their applications will run reliably and with adequate performance, but cloud providers don’t want to offer them, because they are technically hard to meet in the face of arbitrary customer behavior and the hidden interactions brought about by statistical multiplexing of shared resources.
|
||
</p></blockquote>
|
||
|
||
|
||
|
||
<p class="wp-block-paragraph">When it comes to SLOs, the interests of the customer and the cloud provider are at odds, and so we end up with SLAs (Service Level Agreements) that tie SLOs to contractual agreements.</p>
|
||
|
||
|
||
|
||
<h3 class="wp-block-heading">What are we talking about</h3>
|
||
|
||
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||
|
||
<p class="wp-block-paragraph">Let’s start out by getting some terms straight: SLIs, SLOs, SLAs, and how they fit together.</p>
|
||
|
||
|
||
|
||
<ul class="wp-block-list"><li>A <em>Service Level Indicator</em> (SLI) is something you can measure (e.g. a rate, average, percentile, yield, or durability). </li><li>A <em>Service Level Objective</em> (SLO) is a predicate over a set of SLIs. For example, monthly uptime percentage (the SLI) will be at least 99.99%.</li><li>A <em>Service Level Agreement</em> (SLA) is “<em>an SLO plus consequences</em>” : a promise made by a provider than, in exchange for payment, it will meet certain customer visible SLOs.</li></ul>
|
||
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||
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||
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||
<p class="wp-block-paragraph">When SLOs are tied to SLAs, they tend to end up defining the worst case behaviour that a customer can possibly tolerate (because anything beyond that triggers the penalty clause). If a provider consistently delivered service right up to the SLO limit however, it’s unlikely that customers would be very happy. There are a set of <em>Service Level Expectations</em> (SLEs) which need to be met in order to keep customers happy, that are stricter than the SLOs defined in an SLA. From a cloud provider perspective, these are likely to be <em>internal</em> SLOs: the targets that the provider strives to meet, but is not contractually obligated to meet.</p>
|
||
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||
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||
|
||
<p class="wp-block-paragraph">So there are different kinds of SLOs, which the authors argue are best categorised based on the consequences of failing to meet them:</p>
|
||
|
||
|
||
|
||
<ul class="wp-block-list"><li><strong>Contractual SLOs</strong>, connected to SLAs, for which a failure to meet them usually results in financial penalties</li><li><strong>Customer satisfaction SLOs</strong> (SLEs), for which a failure to meet them results in unhappy customers</li><li><strong>Compositional SLOs</strong> are expectations over sets of resources such as “VM failures in two different availability zones are uncorrelated.” These are SLOs that inform a customer’s application design, and failure to meet them may result in invalidated design assumptions — which doesn’t generally turn out well! </li><li><strong>Control loop SLOs</strong> express the active management actions a provider will take, e.g. shedding of low-priority load will occur on over-utilised network links. Failure to meet a control loop SLO usually results in cascading failures and violation of other SLOs.</li></ul>
|
||
|
||
|
||
|
||
<h3 class="wp-block-heading">Why are SLOs so hard to define?</h3>
|
||
|
||
|
||
|
||
<blockquote class="wp-block-quote is-layout-flow wp-block-quote-is-layout-flow"><p>
|
||
Creating an SLA seems simple: define one or more SLOs as predicates on clearly-defined measurements (Service Level Indicators, or SLIs), then have the business experts and lawyers agree on the consequences, and you have an SLA. Sadly, in our experience, SLOs are insanely hard to specify. Customers want different things, and they typically cannot describe what they want in terms that can be measured and in ways that a provider can feasibly commit to promising.
|
||
</p></blockquote>
|
||
|
||
|
||
|
||
<p class="wp-block-paragraph">Consider for example “monthly uptime percentage for a VM will be at least 99.99%.” How are we measuring uptime? On what granularity (seconds, minutes, calendar months, rolling 30 days,…)? What is ‘up’? The VM is provisioned? The VM is running an OS? The VM is reachable from the Internet? Is a performance brownout an outage? And so on.</p>
|
||
|
||
|
||
|
||
<p class="wp-block-paragraph">For cloud providers things get extra complicated due to multi-tenancy, and the fact that the behaviour of their clients can also impact SLIs. As a simple example, an SLO around network throughput might rely on the customer running software capable of driving the network fast enough. Or a system availability SLO, for availability seen by the end user, may well depend on the user carefully exploiting the available redundancy.</p>
|
||
|
||
|
||
|
||
<p class="wp-block-paragraph">Expressing available SLOs in terms of ‘nines’ also causes some issues: it hides the difference between many short outages and a few long ones, which is something many customers care about. It also treats all outages as equal, whereas an outage on Black Friday for a retailer is much worse than an outage on a quiet day of the year.</p>
|
||
|
||
|
||
|
||
<h3 class="wp-block-heading">Is there another way of thinking about this?</h3>
|
||
|
||
|
||
|
||
<p class="wp-block-paragraph">The big idea in the paper is to draw lessons from statistics by analogy.</p>
|
||
|
||
|
||
|
||
<blockquote class="wp-block-quote is-layout-flow wp-block-quote-is-layout-flow"><p>
|
||
A good statistician will look at what decision needs to be made, define hypotheses to test in order to make the decision, decide how to collect sufficient data without bias, often sampled from the underlying population while staying within a budged, and choose an appropriate method to test the hypotheses against the sample.
|
||
</p></blockquote>
|
||
|
||
|
||
|
||
<p class="wp-block-paragraph">In the context of SLAs, the <em>decision</em> is whether or not to invoke the contractual consequences. The problem of measuring SLIs is akin to sample gathering; and choosing a predicate over an SLI is akin to choosing an appropriate method.</p>
|
||
|
||
|
||
|
||
<blockquote class="wp-block-quote is-layout-flow wp-block-quote-is-layout-flow"><p>
|
||
Just as “statistician” and “data scientist” are distinct roles that share many, but not all, skills, “SLOgician” is also a distinct role with its own specific skills.
|
||
</p></blockquote>
|
||
|
||
|
||
|
||
<p class="wp-block-paragraph">How would a SLOgician approach defining SLOs?</p>
|
||
|
||
|
||
|
||
<ul class="wp-block-list"><li>List the good outcomes you want, and the bad outcomes to be avoided</li><li>Agree with business decision makers what the consequences should be</li><li>Operationalize these outcomes, e.g. deciding on level of network capacity</li><li>Decide what data you need to collect in order to decide whether you are suffering from a bad outcome, and what kinds of aggregation are possible. (Analogous to ‘power analysis’ in statistics).</li><li>Decide what predicate on the data tells you whether an outcome has happened</li><li>Decide how much of the desired data you can collect given your resource budget and check it is enough to actually compute the SLOs</li></ul>
|
||
|
||
|
||
|
||
<p class="wp-block-paragraph">If you don’t have enough data collection budget available you could offer fewer SLOs; accept lower confidence in determining whether SLOs are being met; or dynamically lower measurement rate when an SLO is not at risk of violation.</p>
|
||
|
||
|
||
|
||
<p class="wp-block-paragraph">One thing that a statistical outlook reminds us of is that SLOs are very rarely black-and-white, and we need to be accept a level of uncertainty.</p>
|
||
|
||
|
||
|
||
<h3 class="wp-block-heading">Whose responsibility is it?</h3>
|
||
|
||
|
||
|
||
<p class="wp-block-paragraph">My interpretation of the introduction to section 5 in the paper is “we have a problem because our business model seems to depend on us making promises we can’t keep” ;). Or in more technical terms, there are too many SLOs, poorly defined, and depending on decisions outside of the providers control. Wouldn’t it be nice if…</p>
|
||
|
||
|
||
|
||
<blockquote class="wp-block-quote is-layout-flow wp-block-quote-is-layout-flow"><p>
|
||
… following our analogy with statistics, we could focus less on SLOs that guarantee outcomes, and instead use SLOs as a tool for providers to provide structured guidance about decisions that create or remove risk.
|
||
</p></blockquote>
|
||
|
||
|
||
|
||
<p class="wp-block-paragraph">That is, SLOs given by a provider could focus only on risks entirely under the provider’s control. Returning to the availability example, it would be the cloud provider’s responsibility to provide isolated failure zones, but the customer’s responsibility to use them correctly to achieve a desired level of availability.</p>
|
||
|
||
|
||
|
||
<blockquote class="wp-block-quote is-layout-flow wp-block-quote-is-layout-flow"><p>
|
||
Instead of focusing on outcomes, we should focus on expectations, and make these expectations bilateral: what service level the customer can expect from the provider (an SLE), and what the provider can expect from the customer (Customer Behavior Expectations, or CBEs). An SLE only applies if its related CBEs are met. Our view is that the customer and provider should each bear part of the risk of unpredictability, and use SLEs and CBEs to explicitly manage the sharing of risks.
|
||
</p></blockquote>
|
||
|
||
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<p class="wp-block-paragraph">So far so good, but one set of issues the authors would like to share responsibility for are those caused by resource sharing. Now if customer A violates their own CBEs and this causes desired SLOs not to be met, that’s fair game in my mind. With CBEs in place…</p>
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<blockquote class="wp-block-quote is-layout-flow wp-block-quote-is-layout-flow"><p>
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…one could limit sharing-dependent SLOs to be only compositional, not contractual – that is, sharing-dependent SOLs are offered as guidance: the provider implicitly promises not to undermine well-accepted SLEs, but makes no enforceable promises (SLAs) about sharing-dependent outcomes.
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</p></blockquote>
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<p class="wp-block-paragraph">But in noisy neighbour scenarios, customer B violating their own CBEs (or maybe even staying within them!) can impact customer A’s SLOs. I’m not so comfortable with cloud providers side-stepping responsibility for that. After all, they control the isolation mechanisms, the resource overcommitment levels, and so on, and it’s certainly not something the customer can control.</p>
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<h3 class="wp-block-heading">About that recent outage…</h3>
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<p class="wp-block-paragraph">I know this has been a longer write-up than usual, but I can’t resist quoting this paragraph about risks that <em>are</em> under the cloud provider’s control, to be juxtaposed with the emerging details of the recent <a href="https://status.cloud.google.com/incident/cloud-networking/19009">Google Cloud Networking Incident #19009</a>.</p>
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<blockquote class="wp-block-quote is-layout-flow wp-block-quote-is-layout-flow"><p>
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If we could ignore resource sharing, we could focus SLOs on various risks that arise from poor engineering or operational practices, such as not repairing control-plane outages; SDN designs that allow short-term control-plane failure to disrupt the data plane; failover mechanisms that do not actually work; operational procedures that create correlated risks, such as simultaneous maintenance on two availability zones in a region; routing network packets along surprisingly long WAN paths.
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</p></blockquote>
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<p class="wp-block-paragraph">To be clear though, given how enormously complex these environments are, I think it’s pretty amazing that cloud providers are able to provide the levels of service that they do.</p>
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<h3 class="wp-block-heading">The last word</h3>
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<blockquote class="wp-block-quote is-layout-flow wp-block-quote-is-layout-flow"><p>
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We do not pretend to have a complete solution to the problems of cloud-SLO definition, but we think such a solution could emerge from re-thinking our use of SLOs, and using the combination of SLEs and CBEs to create harmonious cooperation in normal times… Perhaps the most important lesson we can learn from statistics, however, is humility — that the combination of unpredictable workloads, hard-to-model behaviour of complex shared infrastructures, and the infeasibility of collecting all the necessary metrics means that certain kinds of SLOs are beyond our power to deliver, no matter how much we believe we need them.
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Pingback: <a href="https://outsidetheknow.wordpress.com/2019/06/19/new-top-story-on-hacker-news-nines-are-not-enough-meaningful-metrics-for-clouds/" class="url" rel="ugc external nofollow">New top story on Hacker News: Nines are not enough: meaningful metrics for clouds – Outside The Know</a> </div>
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Pingback: <a href="https://worldtimes6.wordpress.com/2019/06/19/new-top-story-on-hacker-news-nines-are-not-enough-meaningful-metrics-for-clouds/" class="url" rel="ugc external nofollow">New top story on Hacker News: Nines are not enough: meaningful metrics for clouds – World Best News</a> </div>
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Pingback: <a href="https://hckrnews.wordpress.com/2019/06/19/new-top-story-on-hacker-news-nines-are-not-enough-meaningful-metrics-for-clouds/" class="url" rel="ugc external nofollow">New top story on Hacker News: Nines are not enough: meaningful metrics for clouds – Hckr News</a> </div>
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Pingback: <a href="https://indian215720559.wordpress.com/2019/06/19/new-top-story-on-hacker-news-nines-are-not-enough-meaningful-metrics-for-clouds/" class="url" rel="ugc external nofollow">New top story on Hacker News: Nines are not enough: meaningful metrics for clouds – Golden News</a> </div>
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Pingback: <a href="https://newsblogie.wordpress.com/2019/06/19/new-top-story-on-hacker-news-nines-are-not-enough-meaningful-metrics-for-clouds/" class="url" rel="ugc external nofollow">New top story on Hacker News: Nines are not enough: meaningful metrics for clouds – News about world</a> </div>
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Pingback: <a href="https://latestnewsdesign.wordpress.com/2019/06/19/new-top-story-on-hacker-news-nines-are-not-enough-meaningful-metrics-for-clouds/" class="url" rel="ugc external nofollow">New top story on Hacker News: Nines are not enough: meaningful metrics for clouds – Latest news</a> </div>
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Pingback: <a href="https://www.markbeazley.com/nines-are-not-enough-meaningful-metrics-for-clouds/" class="url" rel="ugc external nofollow">Nines are not enough: meaningful metrics for clouds | Mark Beazley | MarkBeazley.Com</a> </div>
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Pingback: <a href="https://myindianews1.wordpress.com/2019/06/19/nines-are-not-enough-meaningful-metrics-for-clouds/" class="url" rel="ugc external nofollow">Nines are not enough: meaningful metrics for clouds – INDIA NEWS</a> </div>
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Pingback: <a href="https://mytechblog.blogtown.co.nz/2019/06/nines-are-not-enough-meaningful-metrics-for-clouds/" class="url" rel="ugc external nofollow">Nines are not enough: meaningful metrics for clouds | My Tech Blog</a> </div>
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Pingback: <a href="https://ramnetwork99.com/nines-are-not-enough-meaningful-metrics-for-clouds/" class="url" rel="ugc external nofollow">Nines are not enough: meaningful metrics for clouds - RAM NETWORK</a> </div>
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Pingback: <a href="https://hexbyteinc.com/hexbyte-news-computers-nines-are-not-enough-meaningful-metrics-for-clouds/" class="url" rel="ugc external nofollow">Hexbyte News Computers Nines are not enough: meaningful metrics for clouds - HexByte Inc.</a> </div>
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Pingback: <a href="https://hackernewsrobot.wordpress.com/2019/06/19/nines-are-not-enough-meaningful-metrics-for-clouds/" class="url" rel="ugc external nofollow">Nines are not enough: meaningful metrics for clouds – Hacker News Robot</a> </div>
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<img referrerpolicy="no-referrer" alt='Martin Fenelon's avatar' src='https://2.gravatar.com/avatar/5a498024d5e5f5031c45d56f7274ee940805ddee1768b864197eb88b0f264cfb?s=60&d=identicon&r=G' srcset='https://2.gravatar.com/avatar/5a498024d5e5f5031c45d56f7274ee940805ddee1768b864197eb88b0f264cfb?s=60&d=identicon&r=G 1x, https://2.gravatar.com/avatar/5a498024d5e5f5031c45d56f7274ee940805ddee1768b864197eb88b0f264cfb?s=90&d=identicon&r=G 1.5x, https://2.gravatar.com/avatar/5a498024d5e5f5031c45d56f7274ee940805ddee1768b864197eb88b0f264cfb?s=120&d=identicon&r=G 2x, https://2.gravatar.com/avatar/5a498024d5e5f5031c45d56f7274ee940805ddee1768b864197eb88b0f264cfb?s=180&d=identicon&r=G 3x, https://2.gravatar.com/avatar/5a498024d5e5f5031c45d56f7274ee940805ddee1768b864197eb88b0f264cfb?s=240&d=identicon&r=G 4x' class='avatar avatar-60' height='60' width='60' decoding='async' /> <b class="fn">Martin Fenelon</b> <span class="says">says:</span> </div><!-- .comment-author -->
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<a href="https://blog.acolyer.org/2019/06/19/nines-are-not-enough/#comment-57500"><time datetime="2019-06-19T15:28:18+01:00">June 19, 2019 at 3:28 pm</time></a> </div><!-- .comment-metadata -->
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<p>Thanks for a great selection – very timely article and summary with everything going to the cloud these days.</p>
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Pingback: <a href="https://blog.acolyer.org/2019/06/21/what-bugs-cause-cloud-production-incidents/" class="url" rel="ugc">What bugs cause cloud production incidents? – the morning paper</a> </div>
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