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使⽤用Zookeeper改造舊系統 Matt @ JCConf 2016

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About me ▸ 何適宇 ▸ methodho@gmail.com ▸ https://github.com/methodho ▸ https://www.facebook.com/evermatt ▸ 松凌科技

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⼤大綱 ▸ ZooKeeper 介紹 ▸ 使⽤用 ZooKeeper 前的⽅方法 ▸ Java programming to ZooKeeper ▸ o.a.z.ZooKeeper (3.4.9) ▸ o.a.c.f.r.l.LeaderLatch (2.11.0)

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Because coordinating distributed systems is a Zoo Apache ZooKeeper wiki WHAT IS ZOOKEEPER

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https://zookeeper.apache.org/doc/current/zookeeperOver.html WHAT IS ZOOKEEPER

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▸ 啟動server ▸ /bin/zkServer.sh start ▸ 連結到 zookeeper server ▸ /bin/zkCli.sh [-server localhost:2181] ▸ 關閉server ▸ /bin/zkServer.sh stop ZOOKEEPER CLI

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▸ 新增 znode ▸ create [-s] [-e] path data ▸ 刪除 znode ▸ delete path ▸ rmr path ZOOKEEPER CLI

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▸ 列列出 znode 下的 children ▸ ls path [watch] ▸ ls2 path [watch] ▸ 讀寫 znode data (byte[]) ▸ set path data [watch] ▸ get path [watch] ZOOKEEPER CLI

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CLIENT CLIENT CLIENT ZooKeeper Server ZOOKEEPER WATCH

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ZOOKEEPER WATCH CLIENT CLIENT CLIENT ZooKeeper Server watch watch watch

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ZOOKEEPER WATCH CLIENT CLIENT CLIENT 非同步 由 Server 端推送訊息 ⼀一次性 ZooKeeper Server watch watch watch Event Triggered

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A MCV EXAMPLE (MODEL 2) Controller (Servlet/Filter) View (JSP) Model (Java Bean) ^_^

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故事是這樣⼦子的... ?

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BEFORE ZOOKEEPER ▸ 由ap⾃自⼰己控制 ▸ hardcode ▸ properties ▸ passes argument ... ▸ cons? AP1 (run = false) AP3 (run = false) AP2 (run = true)

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BEFORE ZOOKEEPER ▸ 將控制點抽離ap ▸ db table control ▸ db lock ▸ cons? AP1 AP3 AP2 DB run by AP2

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BEFORE ZOOKEEPER 有⼀一個⽅方法可以實作⾃自⼰己的邏輯: 決定誰要執⾏行行 我們需要的是...

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https://zookeeper.apache.org/doc/trunk/recipes.html BEFORE ZOOKEEPER ZooKeeper Recipes !

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https://zookeeper.apache.org/doc/trunk/recipes.html#sc_leaderElection LEADER ELECTION Zookeeper Server / /SOME-PATH /ZNODE_1 CLIENT_1 /ZNODE_2 CLIENT_2 /ZNODE_3 CLIENT_3 A simple way: Use SEQUENCE & EPHEMERAL znode

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https://zookeeper.apache.org/doc/trunk/recipes.html#sc_leaderElection LEADER ELECTION Zookeeper Server Advance solution / /SOME-PATH

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https://zookeeper.apache.org/doc/trunk/recipes.html#sc_leaderElection LEADER ELECTION Zookeeper Server / /SOME-PATH /ZNODE_1 CLIENT_1 Advance solution

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https://zookeeper.apache.org/doc/trunk/recipes.html#sc_leaderElection LEADER ELECTION Zookeeper Server / /SOME-PATH /ZNODE_1 CLIENT_1 /ZNODE_2 CLIENT_2 Advance solution

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https://zookeeper.apache.org/doc/trunk/recipes.html#sc_leaderElection LEADER ELECTION Zookeeper Server / /SOME-PATH /ZNODE_1 CLIENT_1 /ZNODE_2 CLIENT_2 /ZNODE_3 CLIENT_3 Advance solution

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IMPLEMENTING LEADER ELECTION Start (1) Connect to zookeeper server (2) Create parent if not exist (3) Create -e -s node z Node j found End (6) You are leader (7) Watch for node j Y N (5) Find node j , where j is the largest seq and j < z (4) Get and sort all children Node j deleted

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IMPLEMENTING LEADER ELECTION Start (1) Connect to zookeeper server (2) Create parent if not exist (3) Create -e -s node z Node j found End (6) You are leader (7) Watch for node j Y N (5) Find node j , where j is the largest seq and j < z (4) Get and sort all children Node j deleted

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PROGRAMMING TO ZOOKEEPER http://curator.apache.org/

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PROGRAMMING TO ZOOKEEPER (1) Connect to zookeeper server

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PROGRAMMING TO ZOOKEEPER (2) Create parent if not exist

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PROGRAMMING TO ZOOKEEPER (3) Create -e -s node z

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PROGRAMMING TO ZOOKEEPER (4) Get and sort all children (5) Find node j , where j is the largest seq and j < z

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PROGRAMMING TO ZOOKEEPER (7) Watch for node j

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PROGRAMMING TO ZOOKEEPER

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PROGRAMMING TO ZOOKEEPER 剛寫那麼多都是寫 ____ der…

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怎麼串串接到排程中..? ?

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ADAPTING INTO SCHEDULE FRAMEWORK ADAPTING INTO SCHEDULE FRAMEWORK @Scheduled methods @EnableScheduling

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ADAPTING INTO SCHEDULE FRAMEWORK ADAPTING INTO SCHEDULE FRAMEWORK @Scheduled methods @EnableScheduling ScheduledAnnotation BeanPostProcessor Find & register TaskScheduler [default implementation] ThreadPoolTaskScheduler To be invoked by java.util.concurrent.Scheduled ExecutorService ScheduledMethodRunnable(bean, method) Register

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ADAPTING INTO SCHEDULE FRAMEWORK ADAPTING INTO SCHEDULE FRAMEWORK TaskScheduler decorator Original TaskScheduler [default implementation] ThreadPoolTaskScheduler ZooKeeper Server

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PROGRAMMING TO SCHEDULE FRAMEWORK

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PROGRAMMING TO SCHEDULE FRAMEWORK

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PROGRAMMING TO SCHEDULE FRAMEWORK

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PROGRAMMING TO ZOOKEEPER 來來看看實際的程式碼吧...

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PROGRAMMING TO ZOOKEEPER 還可以做些什什麼?

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LEADER ELECTION Zookeeper Server / /SOME-PATH /ZNODE_1 CLIENT_1 /ZNODE_2 CLIENT_2 /ZNODE_3 CLIENT_3

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LEADER ELECTION Zookeeper Server / /SOME-PATH /ZNODE_1 CLIENT_1 80% /ZNODE_2 CLIENT_2 10% /ZNODE_3 CLIENT_3 55% 看看誰的系統資源 使⽤用率最低的就去 執⾏行行吧

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Please leave your comments ↓ https://github.com/methodho/jcconf2016-zookeeper

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Please leave your comments ↓ https://github.com/methodho/jcconf2016-zookeeper And we’re hiring! http://www.softleader.com.tw/web/career.html