- A+
所属分类:未分类
- ZooKeeper是一个分布式的,开放源码的分布式应用程序协调服务,是Google的Chubby一个开源的实现,是Hadoop和Hbase的重要组件。它是一个为分布式应用提供一致性服务的软件,提供的功能包括:配置维护、域名服务、分布式同步、组服务等。
- ZooKeeper的架构通过冗余服务实现高可用性。因此,如果第一次无应答,客户端就可以询问另一台ZooKeeper主机。ZooKeeper节点将它们的数据存储于一个分层的命名空间,非常类似于一个文件系统或一个前缀树结构。客户端可以在节点读写,从而以这种方式拥有一个共享的配置服务。更新是全序的。
- 基于ZooKeeper分布式锁的流程
- 在zookeeper指定节点(locks)下创建临时顺序节点node_n
- 获取locks下所有子节点children
- 对子节点按节点自增序号从小到大排序
- 判断本节点是不是第一个子节点,若是,则获取锁;若不是,则监听比该节点小的那个节点的删除事件
- 若监听事件生效,则回到第二步重新进行判断,直到获取到锁
- 具体实现
- 下面就具体使用java和zookeeper实现分布式锁,操作zookeeper使用的是apache提供的zookeeper的包。
- 通过实现Watch接口,实现process(WatchedEvent event)方法来实施监控,使CountDownLatch来完成监控,在等待锁的时候使用CountDownLatch来计数,等到后进行countDown,停止等待,继续运行。
- 以下整体流程基本与上述描述流程一致,只是在监听的时候使用的是CountDownLatch来监听前一个节点。
- 下边来看简单的实现源码,不用在乎代码的质量,这里只是简单地做个演示!!!
分布式锁:
import org.apache.zookeeper.*; import org.apache.zookeeper.data.Stat; import java.io.IOException; import java.util.ArrayList; import java.util.Collections; import java.util.List; import java.util.concurrent.CountDownLatch; import java.util.concurrent.TimeUnit; import java.util.concurrent.locks.Condition; import java.util.concurrent.locks.Lock; /** * Created by liuyang on 2017/4/20. */ public class DistributedLock implements Lock, Watcher { private ZooKeeper zk = null; // 根节点 private String ROOT_LOCK = "/locks"; // 竞争的资源 private String lockName; // 等待的前一个锁 private String WAIT_LOCK; // 当前锁 private String CURRENT_LOCK; // 计数器 private CountDownLatch countDownLatch; private int sessionTimeout = 30000; private List<Exception> exceptionList = new ArrayList<Exception>(); /** * 配置分布式锁 * @param config 连接的url * @param lockName 竞争资源 */ public DistributedLock(String config, String lockName) { this.lockName = lockName; try { // 连接zookeeper zk = new ZooKeeper(config, sessionTimeout, this); Stat stat = zk.exists(ROOT_LOCK, false); if (stat == null) { // 如果根节点不存在,则创建根节点 zk.create(ROOT_LOCK, new byte[0], ZooDefs.Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT); } } catch (IOException e) { e.printStackTrace(); } catch (InterruptedException e) { e.printStackTrace(); } catch (KeeperException e) { e.printStackTrace(); } } // 节点监视器 public void process(WatchedEvent event) { if (this.countDownLatch != null) { this.countDownLatch.countDown(); } } public void lock() { if (exceptionList.size() > 0) { throw new LockException(exceptionList.get(0)); } try { if (this.tryLock()) { System.out.println(Thread.currentThread().getName() + " " + lockName + "获得了锁"); return; } else { // 等待锁 waitForLock(WAIT_LOCK, sessionTimeout); } } catch (InterruptedException e) { e.printStackTrace(); } catch (KeeperException e) { e.printStackTrace(); } } public boolean tryLock() { try { String splitStr = "_lock_"; if (lockName.contains(splitStr)) { throw new LockException("锁名有误"); } // 创建临时有序节点 CURRENT_LOCK = zk.create(ROOT_LOCK + "/" + lockName + splitStr, new byte[0], ZooDefs.Ids.OPEN_ACL_UNSAFE, CreateMode.EPHEMERAL_SEQUENTIAL); System.out.println(CURRENT_LOCK + " 已经创建"); // 取所有子节点 List<String> subNodes = zk.getChildren(ROOT_LOCK, false); // 取出所有lockName的锁 List<String> lockObjects = new ArrayList<String>(); for (String node : subNodes) { String _node = node.split(splitStr)[0]; if (_node.equals(lockName)) { lockObjects.add(node); } } Collections.sort(lockObjects); System.out.println(Thread.currentThread().getName() + " 的锁是 " + CURRENT_LOCK); // 若当前节点为最小节点,则获取锁成功 if (CURRENT_LOCK.equals(ROOT_LOCK + "/" + lockObjects.get(0))) { return true; } // 若不是最小节点,则找到自己的前一个节点 String prevNode = CURRENT_LOCK.substring(CURRENT_LOCK.lastIndexOf("/") + 1); WAIT_LOCK = lockObjects.get(Collections.binarySearch(lockObjects, prevNode) - 1); } catch (InterruptedException e) { e.printStackTrace(); } catch (KeeperException e) { e.printStackTrace(); } return false; } public boolean tryLock(long timeout, TimeUnit unit) { try { if (this.tryLock()) { return true; } return waitForLock(WAIT_LOCK, timeout); } catch (Exception e) { e.printStackTrace(); } return false; } // 等待锁 private boolean waitForLock(String prev, long waitTime) throws KeeperException, InterruptedException { Stat stat = zk.exists(ROOT_LOCK + "/" + prev, true); if (stat != null) { System.out.println(Thread.currentThread().getName() + "等待锁 " + ROOT_LOCK + "/" + prev); this.countDownLatch = new CountDownLatch(1); // 计数等待,若等到前一个节点消失,则precess中进行countDown,停止等待,获取锁 this.countDownLatch.await(waitTime, TimeUnit.MILLISECONDS); this.countDownLatch = null; System.out.println(Thread.currentThread().getName() + " 等到了锁"); } return true; } public void unlock() { try { System.out.println("释放锁 " + CURRENT_LOCK); zk.delete(CURRENT_LOCK, -1); CURRENT_LOCK = null; zk.close(); } catch (InterruptedException e) { e.printStackTrace(); } catch (KeeperException e) { e.printStackTrace(); } } public Condition newCondition() { return null; } public void lockInterruptibly() throws InterruptedException { this.lock(); } public class LockException extends RuntimeException { private static final long serialVersionUID = 1L; public LockException(String e){ super(e); } public LockException(Exception e){ super(e); } } }
入口类:
package com.demo.index; import com.demo.utils.DistributedLock; import com.jfinal.core.Controller; import com.jfinal.plugin.activerecord.Db; import com.jfinal.plugin.activerecord.Record; /** * 秒杀/zookeeper 分布式锁 * * @author sun */ public class SecKillForZookeeperController extends Controller { public static int goodsTotalNum = 100; public void index() { //每一次新的请求都会模拟抢购100件商品,所以先恢复商品的数量,这个可以不要,也可以手动去更新数据库 Db.update("update t_goods set num = ? where id = 1", goodsTotalNum); Record goods = Db.findFirst("select * from t_goods where id = 1"); Integer num = 0; if(goods!=null){ num = goods.getInt("num"); } SecKillZookeeper sk = new SecKillZookeeper(num); // 模拟120个人抢购。 模拟120人分别在不同的服务器进行发起请求 for (int i = 1; i <= 120; i++) { new Thread(sk, i + " 号人").start(); } renderHtml("<center><h2>抢购成功!</h2></center>"); } } /** * 这里我们只是简单演示实现方式,至于事务等其他的都不添加了。 * * @author sun */ class SecKillZookeeper implements Runnable { private int num = 0; public SecKillZookeeper(int num) { this.num = num; } @Override public void run() { DistributedLock lock = null; try { lock = new DistributedLock("127.0.0.1:2181", "test1"); lock.lock(); if (num > 0) { sale(lock); return ; } } finally { if (lock != null) { lock.unlock(); } } System.err.println(Thread.currentThread().getName() + " 太悲剧了,没抢到商品..."); } private void sale(DistributedLock lock) { if(num>0){ Db.update("update t_goods set num=num-1 where id = 1"); num--; System.out.println(Thread.currentThread().getName()+" 获取锁:"+lock.CURRENT_LOCK+" 抢到了第"+(SecKillForZookeeperController.goodsTotalNum - num)+" 件商品;"); } } }
打印结果:
39 号人 获取锁:/locks/test1_lock_0000001385 抢到了第1 件商品; 释放锁 /locks/test1_lock_0000001385 35 号人 获取锁:/locks/test1_lock_0000001386 抢到了第2 件商品; 释放锁 /locks/test1_lock_0000001386 25 号人 获取锁:/locks/test1_lock_0000001387 抢到了第3 件商品; 释放锁 /locks/test1_lock_0000001387 42 号人 获取锁:/locks/test1_lock_0000001388 抢到了第4 件商品; 释放锁 /locks/test1_lock_0000001388 19 号人 获取锁:/locks/test1_lock_0000001389 抢到了第5 件商品; 释放锁 /locks/test1_lock_0000001389 38 号人 获取锁:/locks/test1_lock_0000001390 抢到了第6 件商品; 释放锁 /locks/test1_lock_0000001390 22 号人 获取锁:/locks/test1_lock_0000001391 抢到了第7 件商品; 释放锁 /locks/test1_lock_0000001391 18 号人 获取锁:/locks/test1_lock_0000001392 抢到了第8 件商品; 释放锁 /locks/test1_lock_0000001392 27 号人 获取锁:/locks/test1_lock_0000001393 抢到了第9 件商品; 释放锁 /locks/test1_lock_0000001393 28 号人 获取锁:/locks/test1_lock_0000001394 抢到了第10 件商品; 释放锁 /locks/test1_lock_0000001394 2 号人 获取锁:/locks/test1_lock_0000001395 抢到了第11 件商品; 释放锁 /locks/test1_lock_0000001395 14 号人 获取锁:/locks/test1_lock_0000001396 抢到了第12 件商品; 释放锁 /locks/test1_lock_0000001396 20 号人 获取锁:/locks/test1_lock_0000001397 抢到了第13 件商品; 释放锁 /locks/test1_lock_0000001397 11 号人 获取锁:/locks/test1_lock_0000001398 抢到了第14 件商品; 释放锁 /locks/test1_lock_0000001398 6 号人 获取锁:/locks/test1_lock_0000001399 抢到了第15 件商品; 释放锁 /locks/test1_lock_0000001399 7 号人 获取锁:/locks/test1_lock_0000001400 抢到了第16 件商品; 释放锁 /locks/test1_lock_0000001400 29 号人 获取锁:/locks/test1_lock_0000001401 抢到了第17 件商品; 释放锁 /locks/test1_lock_0000001401 3 号人 获取锁:/locks/test1_lock_0000001402 抢到了第18 件商品; 释放锁 /locks/test1_lock_0000001402 8 号人 获取锁:/locks/test1_lock_0000001403 抢到了第19 件商品; 释放锁 /locks/test1_lock_0000001403 32 号人 获取锁:/locks/test1_lock_0000001404 抢到了第20 件商品; 释放锁 /locks/test1_lock_0000001404 33 号人 获取锁:/locks/test1_lock_0000001405 抢到了第21 件商品; 释放锁 /locks/test1_lock_0000001405 23 号人 获取锁:/locks/test1_lock_0000001406 抢到了第22 件商品; 释放锁 /locks/test1_lock_0000001406 12 号人 获取锁:/locks/test1_lock_0000001407 抢到了第23 件商品; 释放锁 /locks/test1_lock_0000001407 15 号人 获取锁:/locks/test1_lock_0000001408 抢到了第24 件商品; 释放锁 /locks/test1_lock_0000001408 13 号人 获取锁:/locks/test1_lock_0000001409 抢到了第25 件商品; 释放锁 /locks/test1_lock_0000001409 34 号人 获取锁:/locks/test1_lock_0000001410 抢到了第26 件商品; 释放锁 /locks/test1_lock_0000001410 41 号人 获取锁:/locks/test1_lock_0000001411 抢到了第27 件商品; 释放锁 /locks/test1_lock_0000001411 37 号人 获取锁:/locks/test1_lock_0000001412 抢到了第28 件商品; 释放锁 /locks/test1_lock_0000001412 1 号人 获取锁:/locks/test1_lock_0000001413 抢到了第29 件商品; 释放锁 /locks/test1_lock_0000001413 52 号人 获取锁:/locks/test1_lock_0000001414 抢到了第30 件商品; 释放锁 /locks/test1_lock_0000001414 56 号人 获取锁:/locks/test1_lock_0000001415 抢到了第31 件商品; 释放锁 /locks/test1_lock_0000001415 26 号人 获取锁:/locks/test1_lock_0000001416 抢到了第32 件商品; 释放锁 /locks/test1_lock_0000001416 17 号人 获取锁:/locks/test1_lock_0000001417 抢到了第33 件商品; 释放锁 /locks/test1_lock_0000001417 40 号人 获取锁:/locks/test1_lock_0000001418 抢到了第34 件商品; 释放锁 /locks/test1_lock_0000001418 4 号人 获取锁:/locks/test1_lock_0000001419 抢到了第35 件商品; 释放锁 /locks/test1_lock_0000001419 46 号人 获取锁:/locks/test1_lock_0000001420 抢到了第36 件商品; 释放锁 /locks/test1_lock_0000001420 5 号人 获取锁:/locks/test1_lock_0000001421 抢到了第37 件商品; 释放锁 /locks/test1_lock_0000001421 54 号人 获取锁:/locks/test1_lock_0000001422 抢到了第38 件商品; 释放锁 /locks/test1_lock_0000001422 24 号人 获取锁:/locks/test1_lock_0000001423 抢到了第39 件商品; 释放锁 /locks/test1_lock_0000001423 48 号人 获取锁:/locks/test1_lock_0000001424 抢到了第40 件商品; 释放锁 /locks/test1_lock_0000001424 50 号人 获取锁:/locks/test1_lock_0000001425 抢到了第41 件商品; 释放锁 /locks/test1_lock_0000001425 21 号人 获取锁:/locks/test1_lock_0000001426 抢到了第42 件商品; 释放锁 /locks/test1_lock_0000001426 49 号人 获取锁:/locks/test1_lock_0000001427 抢到了第43 件商品; 释放锁 /locks/test1_lock_0000001427 36 号人 获取锁:/locks/test1_lock_0000001428 抢到了第44 件商品; 释放锁 /locks/test1_lock_0000001428 43 号人 获取锁:/locks/test1_lock_0000001429 抢到了第45 件商品; 释放锁 /locks/test1_lock_0000001429 44 号人 获取锁:/locks/test1_lock_0000001430 抢到了第46 件商品; 释放锁 /locks/test1_lock_0000001430 30 号人 获取锁:/locks/test1_lock_0000001431 抢到了第47 件商品; 释放锁 /locks/test1_lock_0000001431 47 号人 获取锁:/locks/test1_lock_0000001432 抢到了第48 件商品; 释放锁 /locks/test1_lock_0000001432 10 号人 获取锁:/locks/test1_lock_0000001433 抢到了第49 件商品; 释放锁 /locks/test1_lock_0000001433 9 号人 获取锁:/locks/test1_lock_0000001434 抢到了第50 件商品; 释放锁 /locks/test1_lock_0000001434 51 号人 获取锁:/locks/test1_lock_0000001435 抢到了第51 件商品; 释放锁 /locks/test1_lock_0000001435 31 号人 获取锁:/locks/test1_lock_0000001436 抢到了第52 件商品; 释放锁 /locks/test1_lock_0000001436 16 号人 获取锁:/locks/test1_lock_0000001437 抢到了第53 件商品; 释放锁 /locks/test1_lock_0000001437 45 号人 获取锁:/locks/test1_lock_0000001438 抢到了第54 件商品; 释放锁 /locks/test1_lock_0000001438 55 号人 获取锁:/locks/test1_lock_0000001439 抢到了第55 件商品; 释放锁 /locks/test1_lock_0000001439 53 号人 获取锁:/locks/test1_lock_0000001440 抢到了第56 件商品; 释放锁 /locks/test1_lock_0000001440 61 号人 获取锁:/locks/test1_lock_0000001441 抢到了第57 件商品; 释放锁 /locks/test1_lock_0000001441 59 号人 获取锁:/locks/test1_lock_0000001442 抢到了第58 件商品; 释放锁 /locks/test1_lock_0000001442 58 号人 获取锁:/locks/test1_lock_0000001443 抢到了第59 件商品; 释放锁 /locks/test1_lock_0000001443 57 号人 获取锁:/locks/test1_lock_0000001444 抢到了第60 件商品; 释放锁 /locks/test1_lock_0000001444 60 号人 获取锁:/locks/test1_lock_0000001445 抢到了第61 件商品; 释放锁 /locks/test1_lock_0000001445 92 号人 获取锁:/locks/test1_lock_0000001446 抢到了第62 件商品; 释放锁 /locks/test1_lock_0000001446 95 号人 获取锁:/locks/test1_lock_0000001447 抢到了第63 件商品; 释放锁 /locks/test1_lock_0000001447 94 号人 获取锁:/locks/test1_lock_0000001448 抢到了第64 件商品; 释放锁 /locks/test1_lock_0000001448 96 号人 获取锁:/locks/test1_lock_0000001449 抢到了第65 件商品; 释放锁 /locks/test1_lock_0000001449 98 号人 获取锁:/locks/test1_lock_0000001450 抢到了第66 件商品; 释放锁 /locks/test1_lock_0000001450 100 号人 获取锁:/locks/test1_lock_0000001451 抢到了第67 件商品; 释放锁 /locks/test1_lock_0000001451 101 号人 获取锁:/locks/test1_lock_0000001452 抢到了第68 件商品; 释放锁 /locks/test1_lock_0000001452 102 号人 获取锁:/locks/test1_lock_0000001453 抢到了第69 件商品; 释放锁 /locks/test1_lock_0000001453 104 号人 获取锁:/locks/test1_lock_0000001454 抢到了第70 件商品; 释放锁 /locks/test1_lock_0000001454 117 号人 获取锁:/locks/test1_lock_0000001455 抢到了第71 件商品; 释放锁 /locks/test1_lock_0000001455 116 号人 获取锁:/locks/test1_lock_0000001456 抢到了第72 件商品; 释放锁 /locks/test1_lock_0000001456 113 号人 获取锁:/locks/test1_lock_0000001457 抢到了第73 件商品; 释放锁 /locks/test1_lock_0000001457 119 号人 获取锁:/locks/test1_lock_0000001458 抢到了第74 件商品; 释放锁 /locks/test1_lock_0000001458 120 号人 获取锁:/locks/test1_lock_0000001459 抢到了第75 件商品; 释放锁 /locks/test1_lock_0000001459 111 号人 获取锁:/locks/test1_lock_0000001460 抢到了第76 件商品; 释放锁 /locks/test1_lock_0000001460 115 号人 获取锁:/locks/test1_lock_0000001461 抢到了第77 件商品; 释放锁 /locks/test1_lock_0000001461 107 号人 获取锁:/locks/test1_lock_0000001462 抢到了第78 件商品; 释放锁 /locks/test1_lock_0000001462 114 号人 获取锁:/locks/test1_lock_0000001463 抢到了第79 件商品; 释放锁 /locks/test1_lock_0000001463 109 号人 获取锁:/locks/test1_lock_0000001464 抢到了第80 件商品; 释放锁 /locks/test1_lock_0000001464 63 号人 获取锁:/locks/test1_lock_0000001465 抢到了第81 件商品; 释放锁 /locks/test1_lock_0000001465 62 号人 获取锁:/locks/test1_lock_0000001466 抢到了第82 件商品; 释放锁 /locks/test1_lock_0000001466 88 号人 获取锁:/locks/test1_lock_0000001467 抢到了第83 件商品; 释放锁 /locks/test1_lock_0000001467 81 号人 获取锁:/locks/test1_lock_0000001468 抢到了第84 件商品; 释放锁 /locks/test1_lock_0000001468 82 号人 获取锁:/locks/test1_lock_0000001469 抢到了第85 件商品; 释放锁 /locks/test1_lock_0000001469 87 号人 获取锁:/locks/test1_lock_0000001470 抢到了第86 件商品; 释放锁 /locks/test1_lock_0000001470 64 号人 获取锁:/locks/test1_lock_0000001471 抢到了第87 件商品; 释放锁 /locks/test1_lock_0000001471 84 号人 获取锁:/locks/test1_lock_0000001472 抢到了第88 件商品; 释放锁 /locks/test1_lock_0000001472 68 号人 获取锁:/locks/test1_lock_0000001473 抢到了第89 件商品; 释放锁 /locks/test1_lock_0000001473 67 号人 获取锁:/locks/test1_lock_0000001474 抢到了第90 件商品; 释放锁 /locks/test1_lock_0000001474 99 号人 获取锁:/locks/test1_lock_0000001475 抢到了第91 件商品; 释放锁 /locks/test1_lock_0000001475 78 号人 获取锁:/locks/test1_lock_0000001476 抢到了第92 件商品; 释放锁 /locks/test1_lock_0000001476 73 号人 获取锁:/locks/test1_lock_0000001477 抢到了第93 件商品; 释放锁 /locks/test1_lock_0000001477 71 号人 获取锁:/locks/test1_lock_0000001478 抢到了第94 件商品; 释放锁 /locks/test1_lock_0000001478 83 号人 获取锁:/locks/test1_lock_0000001479 抢到了第95 件商品; 释放锁 /locks/test1_lock_0000001479 91 号人 获取锁:/locks/test1_lock_0000001480 抢到了第96 件商品; 释放锁 /locks/test1_lock_0000001480 90 号人 获取锁:/locks/test1_lock_0000001481 抢到了第97 件商品; 释放锁 /locks/test1_lock_0000001481 65 号人 获取锁:/locks/test1_lock_0000001482 抢到了第98 件商品; 释放锁 /locks/test1_lock_0000001482 77 号人 获取锁:/locks/test1_lock_0000001483 抢到了第99 件商品; 释放锁 /locks/test1_lock_0000001483 76 号人 获取锁:/locks/test1_lock_0000001484 抢到了第100 件商品; 释放锁 /locks/test1_lock_0000001484 释放锁 /locks/test1_lock_0000001485 75 号人 太悲剧了,没抢到商品... 释放锁 /locks/test1_lock_0000001486 69 号人 太悲剧了,没抢到商品... 释放锁 /locks/test1_lock_0000001487 89 号人 太悲剧了,没抢到商品... 释放锁 /locks/test1_lock_0000001488 105 号人 太悲剧了,没抢到商品... 释放锁 /locks/test1_lock_0000001489 85 号人 太悲剧了,没抢到商品... 释放锁 /locks/test1_lock_0000001490 74 号人 太悲剧了,没抢到商品... 释放锁 /locks/test1_lock_0000001491 66 号人 太悲剧了,没抢到商品... 释放锁 /locks/test1_lock_0000001492 112 号人 太悲剧了,没抢到商品... 释放锁 /locks/test1_lock_0000001493 释放锁 /locks/test1_lock_0000001494 释放锁 /locks/test1_lock_0000001495 70 号人 太悲剧了,没抢到商品... 108 号人 太悲剧了,没抢到商品... 79 号人 太悲剧了,没抢到商品... 释放锁 /locks/test1_lock_0000001496 释放锁 /locks/test1_lock_0000001497 93 号人 太悲剧了,没抢到商品... 释放锁 /locks/test1_lock_0000001498 106 号人 太悲剧了,没抢到商品... 释放锁 /locks/test1_lock_0000001499 103 号人 太悲剧了,没抢到商品... 释放锁 /locks/test1_lock_0000001500 释放锁 /locks/test1_lock_0000001501 72 号人 太悲剧了,没抢到商品... 80 号人 太悲剧了,没抢到商品... 118 号人 太悲剧了,没抢到商品... 释放锁 /locks/test1_lock_0000001502 86 号人 太悲剧了,没抢到商品... 释放锁 /locks/test1_lock_0000001503 97 号人 太悲剧了,没抢到商品... 释放锁 /locks/test1_lock_0000001504 110 号人 太悲剧了,没抢到商品...
总体来说,如果了解到整个实现流程,使用zookeeper实现分布式锁并不是很困难,不过这也只是一个简单的实现,与前面实现Redis实现相比,本实现的稳定性更强,这是因为zookeeper的特性所致,在外界看来,zookeeper集群中每一个节点都是一致的。
t_goods表结构:
CREATE TABLE `d_sunjs_test`.`t_goods` ( `id` int(11) NOT NULL AUTO_INCREMENT, `name` varchar(255) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL, `num` int(11) NULL DEFAULT NULL, `version` int(11) NULL DEFAULT 1 COMMENT '乐观锁', PRIMARY KEY (`id`) USING BTREE ) ENGINE = InnoDB AUTO_INCREMENT = 2 CHARACTER SET = utf8 COLLATE = utf8_general_ci ROW_FORMAT = Dynamic;
测试的时候记得启动zookeeper服务!
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