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sreweekly/markdown/138/03-colmmacc-on-twitter-shuffle-sharding.md

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+# @colmmacc on Twitter: shuffle sharding
+
+- **期号**: SRE Weekly Issue #138（2018-09-09）
+- **作者**: Colm MacCárthaigh — AWS (thanks to Thread Reader for the thread rollup)
+- **链接**: https://threadreaderapp.com/thread/1034492056968736768.html?utm_source=last_week_in_AWS&utm_medium=newsletter&utm_campaign=website&utm_source=Last%20Week%20in%20AWS&utm_medium=email
+
+## 简介
+
+Colm MacCárthaigh explains how shuffle sharding improves reliability by acting like some kind of magic lever made of math.
+
+## 正文
+
+![Profile picture](https://threadreaderapp.com/images/avatars/14340150.jpg) 
+
+[@colmmacc](https://twitter.com/colmmacc)
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+
+
+
+![Profile picture](https://threadreaderapp.com/images/Twitter_Logo_Blue.png)
+
+![](https://pbs.twimg.com/media/DltAuMNUYAEJCIQ.jpg) 
+
+![](https://pbs.twimg.com/media/DltBh42U0AAMmPC.jpg) 
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+![](https://pbs.twimg.com/media/DltDnteV4AAbU90.jpg) 
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+![](https://pbs.twimg.com/media/DltD33yUwAEUW0r.jpg) 
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+![](https://pbs.twimg.com/media/DltEIgdUcAAPYNR.jpg) 
+
+![](https://pbs.twimg.com/media/DltEYYJVsAA-skb.jpg) 
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+![](https://pbs.twimg.com/media/DltExMVU4AAeuzQ.jpg) 
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+![](https://pbs.twimg.com/media/DltFB1GU0AAOaOr.jpg) 
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+![](https://pbs.twimg.com/media/DltFUTFU8AArQqH.jpg) 
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+![](https://pbs.twimg.com/media/DltFfyOVAAAmLHD.jpg) 
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+![](https://pbs.twimg.com/media/DltGd1YVsAAfiaS.jpg) 
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+![](https://pbs.twimg.com/media/DltGkZNV4AA1B3v.jpg) 
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+![](https://pbs.twimg.com/media/DltGzsTU0AE5ndd.jpg) 
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+![](https://pbs.twimg.com/media/DltHNnpUcAAIA_A.jpg) 
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+![](https://pbs.twimg.com/media/DltHvLsUYAA9qSO.jpg) 
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+![](https://pbs.twimg.com/media/DltIKmiVAAAwN_u.jpg) 
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+![](https://pbs.twimg.com/media/DltItHJUwAAPz86.jpg) 
+
+[gist.github.com/colmmacc/4a39a…](https://gist.github.com/colmmacc/4a39a6416d2a58b6c70bc73027bea4dc). Try it for Route 53's numbers. There are 2048 Route 53 virtual name servers, and each hosted zone is assigned to 4. So n = 2048, and m = 4.
+
+[github.com/awslabs/route5…](https://github.com/awslabs/route53-infima)
+
+![](https://pbs.twimg.com/media/DltKPTxVsAAQdbp.jpg) 
+
+![](https://pbs.twimg.com/media/DltK8nhVAAAVigC.jpg) 
+
+[en.wikipedia.org/wiki/Lottery_m…](https://en.wikipedia.org/wiki/Lottery_mathematics)has good background on how we then come to this equation ...
+
+![](https://pbs.twimg.com/media/DltL6nmV4AAAdee.jpg) 
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+![](https://pbs.twimg.com/media/DltMSIyUcAA6LqM.jpg) 
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+![](https://pbs.twimg.com/media/DltMc-AU8AAcCWB.jpg) 
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+![](https://pbs.twimg.com/media/DltMur_UwAAeJ0f.jpg) 
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+![](https://pbs.twimg.com/media/DltNCQxUwAAc2xl.jpg)