September 2013
Intermediate to advanced
264 pages
5h
Chinese
Content preview from Bad Data 技術手冊
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遠距備援變成優先
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181
較高的 IO 是有代價的
在接下來的幾個禮拜中，沒有實際的狀況發生。因為發生了這麼多事情，他們不再冒
險。他們持續的監控基礎設施架構，特別是資料庫的部分。藉由 RAID 10 與適當的監
控，他們知道就大部分來說他們已經做得不錯了。隨著時間過去，他們開始注意到一些
奇怪的行為，不太知道要如何解釋它們。整體的效能看起來上升非常多，但有一個特定
動作的效能實際上卻變差了。晚上整批匯入的動作實際上的執行時間要比以往久，就算
被匯入的資料跟以前是差不多的也是一樣。在外部系統將資料處理過後，他們會在一個
大的批次檔案中讀入資料。這個行為跟他們所期望的都相反，而他們希望要對這個狀況
有合理的解釋。用 Google 搜尋到一些論壇的答案，但都沒有清楚的解釋。他們合理的
認為，這可能是因為發生在多租戶（multitenancy）網路上的某些隨機的高度延遲，藉
由加倍輸出以及加倍頻寬應該可以減輕這個問題。在花費許多時間嘗試診斷後，包括嘗
試在別的區域執行他們的叢集，最終他們放棄了，直接假設這可能是監控的問題，或甚
至是一個沒有解決方案的問題。他們接受了效能降低的問題，因為整體效能仍然是增加
的。多數的動作都在可理解且可預期的範圍內增加了效能。
資料量增加
當使用者的量成長時，資料成長的更快。他們主動的發現在這一對機器上無法維持這個
成長，他們必須要分割資料到多台機器上。他們始終知道這件事情，事實上他們也計劃
要做這件事，但之前的停電事件讓他們調整了方法。
遠距備援變成優先
雲端提供者的其中一個優點，就是無縫的在許多不同的區域 ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.