关于Zookeeper，之前有过几篇
文章已经介绍过了，因此本文不赘述。 本次小编对单机部署的Zookeeper的读、写进行了一次简单
性能测试。 性能测试脚本由
java完成，具体请看代码清单：
package com.kiven.test;
import java.util.List;
import java.util.concurrent.CountDownLatch;
import org.apache.log4j.PropertyConfigurator;
import org.apache.zookeeper.CreateMode;
import org.apache.zookeeper.KeeperException;
import org.apache.zookeeper.WatchedEvent;
import org.apache.zookeeper.Watcher;
import org.apache.zookeeper.Watcher.Event.KeeperState;
import org.apache.zookeeper.ZooDefs.Ids;
import org.apache.zookeeper.ZooKeeper;
public class Test{
/**
*
server列表, 以逗号分割
*/
protected static String hosts = "172.16.217.148:2181";
/**
* 连接的超时时间, 毫秒
*/
private final int SESSION_TIMEOUT = 5000;
private CountDownLatch connectedSignal = new CountDownLatch(1);
protected static ZooKeeper zk;
private static String nodePath = "/Test/test1";
//static String data = "a very long string about data to set to zookeeper";
static int threads = 10; //线程数
static int runs = 1000; //迭代次数
static int start = 0; //none
static int size = 1024*4; //写入数据的大小,单位：字节
static byte[] testdata; //测试数据
public static void main(String[] args) throws Exception {
PropertyConfigurator.configure("log4j.properties");
//生成写入的数据，大小size字节
testdata = new byte[size];
for(int i=0;i<size;i++){
testdata[i] = 'A';
}
Test test = new Test();
//连接
test.connect();
WorkerStat[] statArray = new WorkerStat[threads];
Thread[] threadArray = new Thread[threads];
WorkerStat mainStat = new WorkerStat();
mainStat.runs = runs * threads;
long begin = System.currentTimeMillis();
for (int i = 0; i < threads; i++) {
statArray[i] = new WorkerStat();
statArray[i].start = start + i * runs;
statArray[i].runs = runs;
threadArray[i] = new SetterThread(statArray[i]);
threadArray[i].start();
}
for (int i = 0; i < threads; i++) {
threadArray[i].join();
}
mainStat.setterTime = System.currentTimeMillis() - begin;
begin = System.currentTimeMillis();
for (int i = 0; i < threads; i++) {
threadArray[i] = new GetterThread(statArray[i]);
threadArray[i].start();
}
for (int i = 0; i < threads; i++) {
threadArray[i].join();
}
mainStat.getterTime = System.currentTimeMillis() - begin;
WorkerStat totalStat = new WorkerStat();
System.out.println("Test over!!");
System.out.println("Thread("+threads+")\truns\tset time(ms)\tget time(ms)");
for (int i = 0; i < threads; i++) {
totalStat.runs = totalStat.runs + statArray[i].runs;
totalStat.setterTime = totalStat.setterTime + statArray[i].setterTime;
totalStat.getterTime = totalStat.getterTime + statArray[i].getterTime;
}
System.out.println("Total\t\t" + totalStat.runs + "\t"+ totalStat.setterTime + "\t\t" + totalStat.getterTime);
System.out.println("Avg\t\t" + runs + "\t" + totalStat.setterTime/ threads + "\t\t" + totalStat.getterTime / threads);
System.out.println("TPS\t\t\t" + 1000 * totalStat.runs/ totalStat.setterTime + "\t\t" + 1000 * totalStat.runs/ totalStat.getterTime);
System.out.println("\nMain\t\t" + mainStat.runs + "\t"+ mainStat.setterTime + "\t\t" + mainStat.getterTime);
System.out.println("TPS\t\t" + 1000 * mainStat.runs/ mainStat.setterTime + "\t\t" + 1000 * mainStat.runs/ mainStat.getterTime);
}
private static class WorkerStat {
public int start, runs;
public long setterTime, getterTime;
public WorkerStat() {
start = runs = 0;
setterTime = getterTime = 0;
}
}
private static class SetterThread extends Thread {
private WorkerStat stat;
SetterThread(WorkerStat stat) {
this.stat = stat;
}
public void run() {
long begin = System.currentTimeMillis();
for (int i = stat.start; i < stat.start + stat.runs; i++) {
//写入节点数据
try {
zk.setData(nodePath, testdata, -1);
} catch (Exception e) {
e.printStackTrace();
}
}
long end = System.currentTimeMillis();
stat.setterTime = end - begin;
}
}
private static class GetterThread extends Thread {
private WorkerStat stat;
GetterThread(WorkerStat stat) {
this.stat = stat;
}
public void run() {
long begin = System.currentTimeMillis();
for (int i = stat.start; i < stat.start + stat.runs; i++) {
//读取节点数据
try {
zk.getData(nodePath, false, null);
} catch (Exception e) {
e.printStackTrace();
}
}
long end = System.currentTimeMillis();
stat.getterTime = end - begin;
}
}
//===============================================================================
/**
* 连接zookeeper server
*/
public void connect() throws Exception {
zk = new ZooKeeper(hosts, SESSION_TIMEOUT, new ConnWatcher());
// 等待连接完成
connectedSignal.await();
}
/**
*
* @author Kiven
*
*/
public class ConnWatcher implements Watcher{
public void process(WatchedEvent event) {
// 连接建立, 回调process接口时, 其event.getState()为KeeperState.SyncConnected
if (event.getState() == KeeperState.SyncConnected) {
// 放开闸门, wait在connect方法上的线程将被唤醒
connectedSignal.countDown();
}
}
}
/**
以下为各个参数的详细说明:
path. znode的路径.
data. 与znode关联的数据.
acl. 指定权限信息, 如果不想指定权限, 可以传入Ids.OPEN_ACL_UNSAFE.
指定znode类型. CreateMode是一个枚举类, 从中选择一个成员传入即可.
*/
/**
* 创建持久化节点
*/
public void create(String Path, byte[] data) throws Exception {
zk.create(Path, data, Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT);
System.out.println("创建节点:"+Path);
System.out.println("=================");
}
/**
*
*获取节点信息
*@author kiven
*@createDate 2013-01-16 15:17:22
*@param path
*@throws KeeperException
*@throws InterruptedException
*/
public void getChild(String path) throws KeeperException, InterruptedException{
try{
List list=zk.getChildren(path, false);
if(list.isEmpty()){
System.out.println(path+"中没有节点");
}else{
System.out.println(path+"中存在节点");
for(String child:list){
System.out.println("节点为："+child);
}
}
}catch (KeeperException.NoNodeException e) {
e.printStackTrace();
}
}
/**
* 设置节点数据
* @throws Exception
*/
public void setData(String path,String data) throws Exception{
zk.setData(path, data.getBytes(), -1);
System.out.println("set Data:"+"testSetData");
}
/**
* 读取节点数据
* @throws Exception
*/
public void getData() throws Exception{
System.out.println("get Data:");
zk.getData(nodePath, false, null);
}
/**
* 删除节点
* @param path
* @throws Exception
*/
public void delete(String path) throws Exception{
System.out.println("删除节点:"+path);
//如果版本号与znode的版本号不一致，将无法删除，是一种乐观加锁机制；如果将版本号设置为-1，不会去检测版本，直接删除；
zk.delete(path, -1);
}
/**
* 关闭连接
*/
public void close() {
try {
zk.close();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
相关功能代码中都已经注释清楚。我们看一下测试下来的结果： 写入数据：
读取数据：
由上两张图我们可以得知：
1、写入（set）数据时，单个线程执行是最快的，而读取（get）数据则是4或5个线程并发是最快的。
2、每个节点存储的数据不能超过1M（在Zookeeper默认配置的情况下，如果写入的数据为1M会报错，无法写入数据，所以所有应用写入的数据必须<1M）
3、单个写入数据的体积越大，处理速度越慢，响应时间越长。
4、会管应用中写入的数据最大的是16方画面合成的时候，此时写入的数据可能大于4K，另外16方画面合成时候zk节点存放的数据（json）是包含大量空格和换行的（在zk节点中，空格和换行也是占大小的），因此建议压缩json数据。
5、测试过程中产生的log文件对磁盘的消耗和占用较大，建议定时删除历史log和shapshot
最新内容请见作者的GitHub页：http://qaseven.github.io/
相关资源：使用JMeter对ZK性能测试时需要安装的插件
