ZooKeeper是Hadoop的开源子项目(Google Chubby的开源实现),它是一个针对大型分布式系统的可靠协调系统,提供的功能包括:配置管理、命名服务、分布式锁、集群管理等。css
本文主要讲述如何在Windows环境上搭建ZooKeeper集群环境,注意是在一台Windows机器上部署3个ZooKeeper实例。
本文介绍的 Zookeeper 是以 3.4.8 稳定版本为基础,下载连接:http://zookeeper.apache.org/releases.htmlhtml
我在本地Windows机器上部署3个ZooKeeper实例,目录结构以下:
java
其中,Server_A,Server_B,Server_C各自都拥有一个ZooKeeper实例;ZK_data用来存储ZooKeeper数据信息;ZK_log用来存储ZooKeeper日志信息。
解压缩web
将下载下来的zookeeper-3.4.8.tar.gz解压缩到F:\ZooKeeper\ZK_Cluster\Server_A目录下,以下图所示:
apache
修改zoo.cfg服务器
将conf/zoo_sample.cfg 复制一份命名为zoo.cfg,以下图所示:
socket
而后编辑,以下:分布式
# The number of milliseconds of each tick
tickTime=2000
# The number of ticks that the initial
# synchronization phase can take
initLimit=10
# The number of ticks that can pass between
# sending a request and getting an acknowledgement
syncLimit=5
# the directory where the snapshot is stored.
# do not use /tmp for storage, /tmp here is just
# example sakes.
dataDir=F:/ZooKeeper/ZK_Cluster/ZK_data/ServerA/data/
# the port at which the clients will connect
clientPort=2181
# the maximum number of client connections.
# increase this if you need to handle more clients
#maxClientCnxns=60
server.1=localhost:2887:3887
server.2=localhost:2888:3888
server.3=localhost:2889:3889
配置完成后,咱们进入${ZooKeeper}/bin目录,双击zkServer.cmd脚本便可启动,以下图所示:
svg
刚开始启动ZooKeeper时出现Java.NET.ConnectException: Connection refused: connect错误:oop
2016-05-08 22:53:37,188 [myid:1] - WARN [QuorumPeer[myid=1]/0:0:0:0:0:0:0:0:2181:QuorumCnxManager@400] - Cannot open channel to 3 at election address /192.168.1.100:3889
java.net.ConnectException: Connection refused: connect
at java.net.DualStackPlainSocketImpl.waitForConnect(Native Method)
at java.net.DualStackPlainSocketImpl.socketConnect(DualStackPlainSocketImpl.java:85)
at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:172)
at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
at java.net.Socket.connect(Socket.java:589)
at org.apache.zookeeper.server.quorum.QuorumCnxManager.connectOne(QuorumCnxManager.java:381)
at org.apache.zookeeper.server.quorum.QuorumCnxManager.connectAll(QuorumCnxManager.java:426)
at org.apache.zookeeper.server.quorum.FastLeaderElection.lookForLeader(FastLeaderElection.java:843)
at org.apache.zookeeper.server.quorum.QuorumPeer.run(QuorumPeer.java:822)
这个是正常现象,由于此时其它的ZooKeeper实例还未启动,等全部的ZooKeeper实例都启动后集群就正常了。
使用 zkCli.cmd -server 127.0.0.1:2181验证
bin> zkCli.cmd -server 127.0.0.1:2181