ZooKeeper-3.3.4集群安装配置
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ZooKeeper是一个分布式开源框架，提供了协调分布式应用的基本服务，它向外部应用暴露一组通用服务——分布式同步（Distributed Synchronization）、命名服务（Naming Service）、集群维护（Group Maintenance）等，简化分布式应用协调及其管理的难度，提供高性能的分布式服务。ZooKeeper本身可以以Standalone模式安装运行，不过它的长处在于通过分布式ZooKeeper集群（一个Leader，多个Follower），基于一定的策略来保证ZooKeeper集群的稳定性和可用性，从而实现分布式应用的可靠性。
有关ZooKeeper的介绍，网上很多，也可以参考文章后面，我整理的一些相关链接。
ZooKeeper的安装配置还算比较容易的，下面，我们简单说明一下ZooKeeper的配置。
ZooKeeper Standalone模式
从Apache网站上（zookeeper.apache.org）下载ZooKeeper软件包，我选择了3.3.4版本的（zookeeper-3.3.4.tar.gz），在一台Linux机器上安装非常容易，只需要解压缩后，简单配置一下即可以启动ZooKeeper服务器进程。
将zookeeper-3.3.4/conf目录下面的 zoo_sample.cfg修改为zoo.cfg，配置文件内容如下所示：
1tickTime=20002dataDir=/home/hadoop/storage/zookeeper3clientPort=21814initLimit=55syncLimit=2上面各个配置参数的含义也非常简单，引用如下所示：
tickTime —— the basic time unit in milliseconds used by ZooKeeper. It is used to do heartbeats and the minimum session timeout will be twice the tickTime.
dataDir —— the location to store the in-memory database snapshots and, unless specified otherwise, the transaction log of updates to the database.
clientPort —— the port to listen for client connections
下面启动ZooKeeper服务器进程：
1cd zookeeper-3.3.4/2bin/zkServer.sh start通过jps命令可以查看ZooKeeper服务器进程，名称为QuorumPeerMain。
在客户端连接ZooKeeper服务器，执行如下命令：
1bin/zkCli.sh -server dynamic:2181上面dynamic是我的主机名，如果在本机执行，则执行如下命令即可：
1bin/zkCli.sh客户端连接信息如下所示：
01shirdrn@master:~/installation/zookeeper-3.3.4$ bin/zkCli.sh -server dynamic:218102Connecting to dynamic:2181032013-10-28 21:30:06,178 - INFO [main:Environment@97] - Client environment:zookeeper.version=3.3.3-1203054, built on 11/17/2011 05:47 GMT042013-10-28 21:30:06,188 - INFO [main:Environment@97] - Client environment:host.name=master052013-10-28 21:30:06,191 - INFO [main:Environment@97] - Client environment:java.version=1.6.0_30062013-10-28 21:30:06,194 - INFO [main:Environment@97] - Client environment:java.vendor=Sun Microsystems Inc.072013-10-28 21:30:06,200 - INFO [main:Environment@97] - Client environment:java.home=/home/hadoop/installation/jdk1.6.0_30/jre082013-10-28 21:30:06,203 - INFO [main:Environment@97] - Client environment:java.class.path=/home/hadoop/installation/zookeeper-3.3.4/bin/../build/classes:/home/hadoop/installation/zookeeper-3.3.4/bin/../build/lib/*.jar:/home/hadoop/installation/zookeeper-3.3.4/bin/../zookeeper-3.3.4.jar:/home/hadoop/installation/zookeeper-3.3.4/bin/../lib/log4j-1.2.15.jar:/home/hadoop/installation/zookeeper-3.3.4/bin/../lib/jline-0.9.94.jar:/home/hadoop/installation/zookeeper-3.3.4/bin/../lib/commons-lang-2.4.jar:/home/hadoop/installation/zookeeper-3.3.4/bin/../lib/commons-collections-3.2.jar:/home/hadoop/installation/zookeeper-3.3.4/bin/../lib/commons-cli-1.1.jar:/home/hadoop/installation/zookeeper-3.3.4/bin/../lib/apache-rat-tasks-0.6.jar:/home/hadoop/installation/zookeeper-3.3.4/bin/../lib/apache-rat-core-0.6.jar:/home/hadoop/installation/zookeeper-3.3.4/bin/../src/java/lib/*.jar:/home/hadoop/installation/zookeeper-3.3.4/bin/../conf:/home/hadoop/installation/jdk1.6.0_30/lib/*.jar:/home/hadoop/installation/jdk1.6.0_30/jre/lib/*.jar092013-10-28 21:30:06,206 - INFO [main:Environment@97] - Client environment:java.library.path=/home/hadoop/installation/jdk1.6.0_30/jre/lib/i386/client:/home/hadoop/installation/jdk1.6.0_30/jre/lib/i386:/home/hadoop/installation/jdk1.6.0_30/jre/../lib/i386:/usr/java/packages/lib/i386:/lib:/usr/lib102013-10-28 21:30:06,213 - INFO [main:Environment@97] - Client environment:java.io.tmpdir=/tmp112013-10-28 21:30:06,216 - INFO [main:Environment@97] - Client environment:java.compiler=<NA>122013-10-28 21:30:06,235 - INFO [main:Environment@97] - Client environment:os.name=Linux132013-10-28 21:30:06,244 - INFO [main:Environment@97] - Client environment:os.arch=i386142013-10-28 21:30:06,246 - INFO [main:Environment@97] - Client environment:os.version=3.0.0-14-generic152013-10-28 21:30:06,251 - INFO [main:Environment@97] - Client environment:user.name=hadoop162013-10-28 21:30:06,254 - INFO [main:Environment@97] - Client environment:user.home=/home/hadoop172013-10-28 21:30:06,255 - INFO [main:Environment@97] - Client environment:user.dir=/home/hadoop/installation/zookeeper-3.3.4182013-10-28 21:30:06,264 - INFO [main:ZooKeeper@379] - Initiating client connection, connectString=dynamic:2181 sessionTimeout=30000 watcher=org.apache.zookeeper.ZooKeeperMain$MyWatcher@bf32c192013-10-28 21:30:06,339 - INFO [main-SendThread():ClientCnxn$SendThread@1061] - Opening socket connection to server dynamic/192.168.0.107:218120Welcome to ZooKeeper!212013-10-28 21:30:06,397 - INFO [main-SendThread(dynamic:2181):ClientCnxn$SendThread@950] - Socket connection established to dynamic/192.168.0.107:2181, initiating session22JLine support is enabled232013-10-28 21:30:06,492 - INFO [main-SendThread(dynamic:2181):ClientCnxn$SendThread@739] - Session establishment complete on server dynamic/192.168.0.107:2181, sessionid = 0x134b9b714f9000c, negotiated timeout = 300002425WATCHER::2627WatchedEvent state:SyncConnected type:None path:null28[zk: dynamic:2181(CONNECTED) 0]接着，可以使用help查看Zookeeper客户端可以使用的基本操作命令。
ZooKeeper Distributed模式
ZooKeeper分布式模式安装（ZooKeeper集群）也比较容易，这里说明一下基本要点。
首先要明确的是，ZooKeeper集群是一个独立的分布式协调服务集群，“独立”的含义就是说，如果想使用ZooKeeper实现分布式应用的协调与管理，简化协调与管理，任何分布式应用都可以使用，这就要归功于Zookeeper的数据模型（Data Model）和层次命名空间（Hierarchical Namespace）结构，详细可以参考http://zookeeper.apache.org/doc/trunk/zookeeperOver.html。在设计你的分布式应用协调服务时，首要的就是考虑如何组织层次命名空间。
下面说明分布式模式的安装配置，过程如下所示：
第一步：主机名称到IP地址映射配置
ZooKeeper集群中具有两个关键的角色：Leader和Follower。集群中所有的结点作为一个整体对分布式应用提供服务，集群中每个结点之间都互相连接，所以，在配置的ZooKeeper集群的时候，每一个结点的host到IP地址的映射都要配置上集群中其它结点的映射信息。
例如，我的ZooKeeper集群中每个结点的配置，以zk-01为例，/etc/hosts内容如下所示:
1192.168.0.179 zk-012192.168.0.178 zk-023192.168.0.177 zk-03ZooKeeper采用一种称为Leader election的选举算法。在整个集群运行过程中，只有一个Leader，其他的都是Follower，如果ZooKeeper集群在运行过程中Leader出了问题，系统会采用该算法重新选出一个Leader。因此，各个结点之间要能够保证互相连接，必须配置上述映射。
ZooKeeper集群启动的时候，会首先选出一个Leader，在Leader election过程中，某一个满足选举算的结点就能成为Leader。整个集群的架构可以参考http://zookeeper.apache.org/doc/trunk/zookeeperOver.html#sc_designGoals。
第二步：修改ZooKeeper配置文件
在其中一台机器（zk-01）上，解压缩zookeeper-3.3.4.tar.gz，修改配置文件conf/zoo.cfg，内容如下所示：
1tickTime=20002dataDir=/home/hadoop/storage/zookeeper3clientPort=21814initLimit=55syncLimit=26server.1=zk-01:2888:38887server.2=zk-02:2888:38888server.3=zk-03:2888:3888上述配置内容说明，可以参考http://zookeeper.apache.org/doc/trunk/zookeeperStarted.html#sc_RunningReplicatedZooKeeper。
第三步：远程复制分发安装文件
上面已经在一台机器zk-01上配置完成ZooKeeper，现在可以将该配置好的安装文件远程拷贝到集群中的各个结点对应的目录下：
1cd /home/hadoop/installation/2scp -r zookeeper-3.3.4/ shirdrn@zk-02:/home/hadoop/installation/3scp -r zookeeper-3.3.4/ shirdrn@zk-03:/home/hadoop/installation/第四步：设置myid
在我们配置的dataDir指定的目录下面，创建一个myid文件，里面内容为一个数字，用来标识当前主机，conf/zoo.cfg文件中配置的server.X中X为什么数字，则myid文件中就输入这个数字，例如：
1shirdrn@zk-01:~/installation/zookeeper-3.3.4$ echo "1" > /home/hadoop/storage/zookeeper/myid2shirdrn@zk-02:~/installation/zookeeper-3.3.4$ echo "2" > /home/hadoop/storage/zookeeper/myid3shirdrn@zk-03:~/installation/zookeeper-3.3.4$ echo "3" > /home/hadoop/storage/zookeeper/myid按照上述进行配置即可。
第五步：启动ZooKeeper集群
在ZooKeeper集群的每个结点上，执行启动ZooKeeper服务的脚本，如下所示：
1shirdrn@zk-01:~/installation/zookeeper-3.3.4$ bin/zkServer.sh start2shirdrn@zk-02:~/installation/zookeeper-3.3.4$ bin/zkServer.sh start3shirdrn@zk-03:~/installation/zookeeper-3.3.4$ bin/zkServer.sh start以结点zk-01为例，日志如下所示：
001shirdrn@zk-01:~/installation/zookeeper-3.3.4$ tail -500f zookeeper.out0022013-10-28 06:51:19,117 - INFO [main:QuorumPeerConfig@90] - Reading configuration from: /home/hadoop/installation/zookeeper-3.3.4/bin/../conf/zoo.cfg0032013-10-28 06:51:19,133 - INFO [main:QuorumPeerConfig@310] - Defaulting to majority quorums0042013-10-28 06:51:19,167 - INFO [main:QuorumPeerMain@119] - Starting quorum peer0052013-10-28 06:51:19,227 - INFO [main:NIOServerCnxn$Factory@143] - binding to port 0.0.0.0/0.0.0.0:21810062013-10-28 06:51:19,277 - INFO [main:QuorumPeer@819] - tickTime set to 20000072013-10-28 06:51:19,278 - INFO [main:QuorumPeer@830] - minSessionTimeout set to -10082013-10-28 06:51:19,279 - INFO [main:QuorumPeer@841] - maxSessionTimeout set to -10092013-10-28 06:51:19,281 - INFO [main:QuorumPeer@856] - initLimit set to 50102013-10-28 06:51:19,347 - INFO [Thread-1:QuorumCnxManager$Listener@473] - My election bind port: 38880112013-10-28 06:51:19,393 - INFO [QuorumPeer:/0:0:0:0:0:0:0:0:2181:QuorumPeer@621] - LOOKING0122013-10-28 06:51:19,396 - INFO [QuorumPeer:/0:0:0:0:0:0:0:0:2181:FastLeaderElection@663] - New election. My id = 1, Proposed zxid = 00132013-10-28 06:51:19,400 - INFO [WorkerReceiver Thread:FastLeaderElection@496] - Notification: 1 (n.leader), 0 (n.zxid), 1 (n.round), LOOKING (n.state), 1 (n.sid), LOOKING (my state)0142013-10-28 06:51:19,416 - WARN [WorkerSender Thread:QuorumCnxManager@384] - Cannot openchannel to 2 at election address zk-02/192.168.0.178:3888015java.net.ConnectException: Connection refused016 at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method)017 at sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:567)018 at sun.nio.ch.SocketAdaptor.connect(SocketAdaptor.java:100)019 at org.apache.zookeeper.server.quorum.QuorumCnxManager.connectOne(QuorumCnxManager.java:371)020 at org.apache.zookeeper.server.quorum.QuorumCnxManager.toSend(QuorumCnxManager.java:340)021 at org.apache.zookeeper.server.quorum.FastLeaderElection$Messenger$WorkerSender.process(FastLeaderElection.java:360)022 at org.apache.zookeeper.server.quorum.FastLeaderElection$Messenger$WorkerSender.run(FastLeaderElection.java:333)023 at java.lang.Thread.run(Thread.java:662)0242013-10-28 06:51:19,420 - WARN [WorkerSender Thread:QuorumCnxManager@384] - Cannot openchannel to 3 at election address zk-03/192.168.0.177:3888025java.net.ConnectException: Connection refused026 at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method)027 at sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:567)028 at sun.nio.ch.SocketAdaptor.connect(SocketAdaptor.java:100)029 at org.apache.zookeeper.server.quorum.QuorumCnxManager.connectOne(QuorumCnxManager.java:371)030 at org.apache.zookeeper.server.quorum.QuorumCnxManager.toSend(QuorumCnxManager.java:340)031 at org.apache.zookeeper.server.quorum.FastLeaderElection$Messenger$WorkerSender.process(FastLeaderElection.java:360)032 at org.apache.zookeeper.server.quorum.FastLeaderElection$Messenger$WorkerSender.run(FastLeaderElection.java:333)033 at java.lang.Thread.run(Thread.java:662)0342013-10-28 06:51:19,612 - WARN [QuorumPeer:/0:0:0:0:0:0:0:0:2181:QuorumCnxManager@384] - Cannot open channel to 2 at election address zk-02/192.168.0.178:3888035java.net.ConnectException: Connection refused036 at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method)037 at sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:567)038 at sun.nio.ch.SocketAdaptor.connect(SocketAdaptor.java:100)039 at org.apache.zookeeper.server.quorum.QuorumCnxManager.connectOne(QuorumCnxManager.java:371)040 at org.apache.zookeeper.server.quorum.QuorumCnxManager.connectAll(QuorumCnxManager.java:404)041 at org.apache.zookeeper.server.quorum.FastLeaderElection.lookForLeader(FastLeaderElection.java:688)042 at org.apache.zookeeper.server.quorum.QuorumPeer.run(QuorumPeer.java:622)0432013-10-28 06:51:19,615 - WARN [QuorumPeer:/0:0:0:0:0:0:0:0:2181:QuorumCnxManager@384] - Cannot open channel to 3 at election address zk-03/192.168.0.177:3888044java.net.ConnectException: Connection refused045 at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method)046 at sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:567)047 at sun.nio.ch.SocketAdaptor.connect(SocketAdaptor.java:100)048 at org.apache.zookeeper.server.quorum.QuorumCnxManager.connectOne(QuorumCnxManager.java:371)049 at org.apache.zookeeper.server.quorum.QuorumCnxManager.connectAll(QuorumCnxManager.java:404)050 at org.apache.zookeeper.server.quorum.FastLeaderElection.lookForLeader(FastLeaderElection.java:688)051 at org.apache.zookeeper.server.quorum.QuorumPeer.run(QuorumPeer.java:622)0522013-10-28 06:51:19,616 - INFO [QuorumPeer:/0:0:0:0:0:0:0:0:2181:FastLeaderElection@697] - Notification time out: 4000532013-10-28 06:51:20,019 - WARN [QuorumPeer:/0:0:0:0:0:0:0:0:2181:QuorumCnxManager@384] - Cannot open channel to 2 at election address zk-02/192.168.0.178:3888054java.net.ConnectException: Connection refused055 at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method)056 at sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:567)057 at sun.nio.ch.SocketAdaptor.connect(SocketAdaptor.java:100)058 at org.apache.zookeeper.server.quorum.QuorumCnxManager.connectOne(QuorumCnxManager.java:371)059 at org.apache.zookeeper.server.quorum.QuorumCnxManager.connectAll(QuorumCnxManager.java:404)060 at org.apache.zookeeper.server.quorum.FastLeaderElection.lookForLeader(FastLeaderElection.java:688)061 at org.apache.zookeeper.server.quorum.QuorumPeer.run(QuorumPeer.java:622)0622013-10-28 06:51:20,021 - WARN [QuorumPeer:/0:0:0:0:0:0:0:0:2181:QuorumCnxManager@384] - Cannot open channel to 3 at election address zk-03/192.168.0.177:3888063java.net.ConnectException: Connection refused064 at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method)065 at sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:567)066 at sun.nio.ch.SocketAdaptor.connect(SocketAdaptor.java:100)067 at org.apache.zookeeper.server.quorum.QuorumCnxManager.connectOne(QuorumCnxManager.java:371)068 at org.apache.zookeeper.server.quorum.QuorumCnxManager.connectAll(QuorumCnxManager.java:404)069 at org.apache.zookeeper.server.quorum.FastLeaderElection.lookForLeader(FastLeaderElection.java:688)070 at org.apache.zookeeper.server.quorum.QuorumPeer.run(QuorumPeer.java:622)0712013-10-28 06:51:20,022 - INFO [QuorumPeer:/0:0:0:0:0:0:0:0:2181:FastLeaderElection@697] - Notification time out: 8000722013-10-28 06:51:20,825 - WARN [QuorumPeer:/0:0:0:0:0:0:0:0:2181:QuorumCnxManager@384] - Cannot open channel to 2 at election address zk-02/192.168.0.178:3888073java.net.ConnectException: Connection refused074 at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method)075 at sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:567)076 at sun.nio.ch.SocketAdaptor.connect(SocketAdaptor.java:100)077 at org.apache.zookeeper.server.quorum.QuorumCnxManager.connectOne(QuorumCnxManager.java:371)078 at org.apache.zookeeper.server.quorum.QuorumCnxManager.connectAll(QuorumCnxManager.java:404)079 at org.apache.zookeeper.server.quorum.FastLeaderElection.lookForLeader(FastLeaderElection.java:688)080 at org.apache.zookeeper.server.quorum.QuorumPeer.run(QuorumPeer.java:622)0812013-10-28 06:51:20,827 - WARN [QuorumPeer:/0:0:0:0:0:0:0:0:2181:QuorumCnxManager@384] - Cannot open channel to 3 at election address zk-03/192.168.0.177:3888082java.net.ConnectException: Connection refused083 at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method)084 at sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:567)085 at sun.nio.ch.SocketAdaptor.connect(SocketAdaptor.java:100)086 at org.apache.zookeeper.server.quorum.QuorumCnxManager.connectOne(QuorumCnxManager.java:371)087 at org.apache.zookeeper.server.quorum.QuorumCnxManager.connectAll(QuorumCnxManager.java:404)088 at org.apache.zookeeper.server.quorum.FastLeaderElection.lookForLeader(FastLeaderElection.java:688)089 at org.apache.zookeeper.server.quorum.QuorumPeer.run(QuorumPeer.java:622)0902013-10-28 06:51:20,828 - INFO [QuorumPeer:/0:0:0:0:0:0:0:0:2181:FastLeaderElection@697] - Notification time out: 16000912013-10-28 06:51:22,435 - WARN [QuorumPeer:/0:0:0:0:0:0:0:0:2181:QuorumCnxManager@384] - Cannot open channel to 2 at election address zk-02/192.168.0.178:3888092java.net.ConnectException: Connection refused093 at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method)094 at sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:567)095 at sun.nio.ch.SocketAdaptor.connect(SocketAdaptor.java:100)096 at org.apache.zookeeper.server.quorum.QuorumCnxManager.connectOne(QuorumCnxManager.java:371)097 at org.apache.zookeeper.server.quorum.QuorumCnxManager.connectAll(QuorumCnxManager.java:404)098 at org.apache.zookeeper.server.quorum.FastLeaderElection.lookForLeader(FastLeaderElection.java:688)099 at org.apache.zookeeper.server.quorum.QuorumPeer.run(QuorumPeer.java:622)1002013-10-28 06:51:22,439 - WARN [QuorumPeer:/0:0:0:0:0:0:0:0:2181:QuorumCnxManager@384] - Cannot open channel to 3 at election address zk-03/192.168.0.177:3888101java.net.ConnectException: Connection refused102 at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method)103 at sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:567)104 at sun.nio.ch.SocketAdaptor.connect(SocketAdaptor.java:100)105 at org.apache.zookeeper.server.quorum.QuorumCnxManager.connectOne(QuorumCnxManager.java:371)106 at org.apache.zookeeper.server.quorum.QuorumCnxManager.connectAll(QuorumCnxManager.java:404)107 at org.apache.zookeeper.server.quorum.FastLeaderElection.lookForLeader(FastLeaderElection.java:688)108 at org.apache.zookeeper.server.quorum.QuorumPeer.run(QuorumPeer.java:622)1092013-10-28 06:51:22,441 - INFO [QuorumPeer:/0:0:0:0:0:0:0:0:2181:FastLeaderElection@697] - Notification time out: 32001102013-10-28 06:51:22,945 - INFO [WorkerReceiver Thread:FastLeaderElection@496] - Notification: 2 (n.leader), 0 (n.zxid), 1 (n.round), LOOKING (n.state), 2 (n.sid), LOOKING (my state)1112013-10-28 06:51:22,946 - INFO [QuorumPeer:/0:0:0:0:0:0:0:0:2181:FastLeaderElection@721] - Updating proposal1122013-10-28 06:51:22,949 - WARN [WorkerSender Thread:QuorumCnxManager@384] - Cannot openchannel to 3 at election address zk-03/192.168.0.177:3888113java.net.ConnectException: Connection refused114 at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method)115 at sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:567)116 at sun.nio.ch.SocketAdaptor.connect(SocketAdaptor.java:100)117 at org.apache.zookeeper.server.quorum.QuorumCnxManager.connectOne(QuorumCnxManager.java:371)118 at org.apache.zookeeper.server.quorum.QuorumCnxManager.toSend(QuorumCnxManager.java:340)119 at org.apache.zookeeper.server.quorum.FastLeaderElection$Messenger$WorkerSender.process(FastLeaderElection.java:360)120 at org.apache.zookeeper.server.quorum.FastLeaderElection$Messenger$WorkerSender.run(FastLeaderElection.java:333)121 at java.lang.Thread.run(Thread.java:662)1222013-10-28 06:51:22,951 - INFO [WorkerReceiver Thread:FastLeaderElection@496] - Notification: 2 (n.leader), 0 (n.zxid), 1 (n.round), LOOKING (n.state), 1 (n.sid), LOOKING (my state)1232013-10-28 06:51:23,156 - INFO [QuorumPeer:/0:0:0:0:0:0:0:0:2181:QuorumPeer@643] - FOLLOWING1242013-10-28 06:51:23,170 - INFO [QuorumPeer:/0:0:0:0:0:0:0:0:2181:Learner@80] - TCP NoDelayset to: true1252013-10-28 06:51:23,206 - INFO [QuorumPeer:/0:0:0:0:0:0:0:0:2181:Environment@97] - Server environment:zookeeper.version=3.3.3-1203054, built on 11/17/2011 05:47 GMT1262013-10-28 06:51:23,207 - INFO [QuorumPeer:/0:0:0:0:0:0:0:0:2181:Environment@97] - Server environment:host.name=zk-011272013-10-28 06:51:23,207 - INFO [QuorumPeer:/0:0:0:0:0:0:0:0:2181:Environment@97] - Server environment:java.version=1.6.0_301282013-10-28 06:51:23,208 - INFO [QuorumPeer:/0:0:0:0:0:0:0:0:2181:Environment@97] - Server environment:java.vendor=Sun Microsystems Inc.1292013-10-28 06:51:23,208 - INFO [QuorumPeer:/0:0:0:0:0:0:0:0:2181:Environment@97] - Server environment:java.home=/home/hadoop/installation/jdk1.6.0_30/jre1302013-10-28 06:51:23,209 - INFO [QuorumPeer:/0:0:0:0:0:0:0:0:2181:Environment@97] - Server environment:java.class.path=/home/hadoop/installation/zookeeper-3.3.4/bin/../build/classes:/home/hadoop/installation/zookeeper-3.3.4/bin/../build/lib/*.jar:/home/hadoop/installation/zookeeper-3.3.4/bin/../zookeeper-3.3.4.jar:/home/hadoop/installation/zookeeper-3.3.4/bin/../lib/log4j-1.2.15.jar:/home/hadoop/installation/zookeeper-3.3.4/bin/../lib/jline-0.9.94.jar:/home/hadoop/installation/zookeeper-3.3.4/bin/../lib/commons-lang-2.4.jar:/home/hadoop/installation/zookeeper-3.3.4/bin/../lib/commons-collections-3.2.jar:/home/hadoop/installation/zookeeper-3.3.4/bin/../lib/commons-cli-1.1.jar:/home/hadoop/installation/zookeeper-3.3.4/bin/../lib/apache-rat-tasks-0.6.jar:/home/hadoop/installation/zookeeper-3.3.4/bin/../lib/apache-rat-core-0.6.jar:/home/hadoop/installation/zookeeper-3.3.4/bin/../src/java/lib/*.jar:/home/hadoop/installation/zookeeper-3.3.4/bin/../conf:/home/hadoop/installation/jdk1.6.0_30/lib/*.jar:/home/hadoop/installation/jdk1.6.0_30/jre/lib/*.jar1312013-10-28 06:51:23,210 - INFO [QuorumPeer:/0:0:0:0:0:0:0:0:2181:Environment@97] - Server environment:java.library.path=/home/hadoop/installation/jdk1.6.0_30/jre/lib/i386/client:/home/hadoop/installation/jdk1.6.0_30/jre/lib/i386:/home/hadoop/installation/jdk1.6.0_30/jre/../lib/i386:/usr/java/packages/lib/i386:/lib:/usr/lib1322013-10-28 06:51:23,210 - INFO [QuorumPeer:/0:0:0:0:0:0:0:0:2181:Environment@97] - Server environment:java.io.tmpdir=/tmp1332013-10-28 06:51:23,212 - INFO [QuorumPeer:/0:0:0:0:0:0:0:0:2181:Environment@97] - Server environment:java.compiler=<NA>1342013-10-28 06:51:23,212 - INFO [QuorumPeer:/0:0:0:0:0:0:0:0:2181:Environment@97] - Server environment:os.name=Linux1352013-10-28 06:51:23,212 - INFO [QuorumPeer:/0:0:0:0:0:0:0:0:2181:Environment@97] - Server environment:os.arch=i3861362013-10-28 06:51:23,213 - INFO [QuorumPeer:/0:0:0:0:0:0:0:0:2181:Environment@97] - Server environment:os.version=3.0.0-14-generic1372013-10-28 06:51:23,213 - INFO [QuorumPeer:/0:0:0:0:0:0:0:0:2181:Environment@97] - Server environment:user.name=hadoop1382013-10-28 06:51:23,214 - INFO [QuorumPeer:/0:0:0:0:0:0:0:0:2181:Environment@97] - Server environment:user.home=/home/hadoop1392013-10-28 06:51:23,214 - INFO [QuorumPeer:/0:0:0:0:0:0:0:0:2181:Environment@97] - Server environment:user.dir=/home/hadoop/installation/zookeeper-3.3.41402013-10-28 06:51:23,223 - INFO [QuorumPeer:/0:0:0:0:0:0:0:0:2181:ZooKeeperServer@151] - Created server with tickTime 2000 minSessionTimeout 4000 maxSessionTimeout 40000 datadir /home/hadoop/storage/zookeeper/version-2 snapdir /home/hadoop/storage/zookeeper/version-21412013-10-28 06:51:23,339 - INFO [QuorumPeer:/0:0:0:0:0:0:0:0:2181:Learner@294] - Getting a snapshot from leader1422013-10-28 06:51:23,358 - INFO [QuorumPeer:/0:0:0:0:0:0:0:0:2181:Learner@325] - Setting leader epoch 11432013-10-28 06:51:23,358 - INFO [QuorumPeer:/0:0:0:0:0:0:0:0:2181:FileTxnSnapLog@254] - Snapshotting: 01442013-10-28 06:51:25,511 - INFO [WorkerReceiver Thread:FastLeaderElection@496] - Notification: 3 (n.leader), 0 (n.zxid), 1 (n.round), LOOKING (n.state), 3 (n.sid), FOLLOWING (my state)1452013-10-28 06:51:42,584 - INFO [WorkerReceiver Thread:FastLeaderElection@496] - Notification: 3 (n.leader), 0 (n.zxid), 2 (n.round), LOOKING (n.state), 3 (n.sid), FOLLOWING (my state)我启动的顺序是zk-01>zk-02>zk-03，由于ZooKeeper集群启动的时候，每个结点都试图去连接集群中的其它结点，先启动的肯定连不上后面还没启动的，所以上面日志前面部分的异常是可以忽略的。通过后面部分可以看到，集群在选出一个Leader后，最后稳定了。
其他结点可能也出现类似问题，属于正常。
第六步：安装验证
可以通过ZooKeeper的脚本来查看启动状态，包括集群中各个结点的角色（或是Leader，或是Follower），如下所示，是在ZooKeeper集群中的每个结点上查询的结果：
01shirdrn@zk-01:~/installation/zookeeper-3.3.4$ bin/zkServer.sh status02JMX enabled by default03Using config: /home/hadoop/installation/zookeeper-3.3.4/bin/../conf/zoo.cfg04Mode: follower0506shirdrn@zk-02:~/installation/zookeeper-3.3.4$ bin/zkServer.sh status07JMX enabled by default08Using config: /home/hadoop/installation/zookeeper-3.3.4/bin/../conf/zoo.cfg09Mode: leader1011shirdrn@zk-03:~/installation/zookeeper-3.3.4$ bin/zkServer.sh status12JMX enabled by default13Using config: /home/hadoop/installation/zookeeper-3.3.4/bin/../conf/zoo.cfg14Mode: follower通过上面状态查询结果可见，zk-02是集群的Leader，其余的两个结点是Follower。
另外，可以通过客户端脚本，连接到ZooKeeper集群上。对于客户端来说，ZooKeeper是一个整体（ensemble），连接到ZooKeeper集群实际上感觉在独享整个集群的服务，所以，你可以在任何一个结点上建立到服务集群的连接，例如：
01shirdrn@zk-03:~/installation/zookeeper-3.3.4$ bin/zkCli.sh -server zk-01:218102Connecting to zk-01:2181032013-10-28 07:14:21,068 - INFO [main:Environment@97] - Client environment:zookeeper.version=3.3.3-1203054, built on 11/17/2011 05:47 GMT042013-10-28 07:14:21,080 - INFO [main:Environment@97] - Client environment:host.name=zk-03052013-10-28 07:14:21,085 - INFO [main:Environment@97] - Client environment:java.version=1.6.0_30062013-10-28 07:14:21,089 - INFO [main:Environment@97] - Client environment:java.vendor=Sun Microsystems Inc.072013-10-28 07:14:21,095 - INFO [main:Environment@97] - Client environment:java.home=/home/hadoop/installation/jdk1.6.0_30/jre082013-10-28 07:14:21,104 - INFO [main:Environment@97] - Client environment:java.class.path=/home/hadoop/installation/zookeeper-3.3.4/bin/../build/classes:/home/hadoop/installation/zookeeper-3.3.4/bin/../build/lib/*.jar:/home/hadoop/installation/zookeeper-3.3.4/bin/../zookeeper-3.3.4.jar:/home/hadoop/installation/zookeeper-3.3.4/bin/../lib/log4j-1.2.15.jar:/home/hadoop/installation/zookeeper-3.3.4/bin/../lib/jline-0.9.94.jar:/home/hadoop/installation/zookeeper-3.3.4/bin/../lib/commons-lang-2.4.jar:/home/hadoop/installation/zookeeper-3.3.4/bin/../lib/commons-collections-3.2.jar:/home/hadoop/installation/zookeeper-3.3.4/bin/../lib/commons-cli-1.1.jar:/home/hadoop/installation/zookeeper-3.3.4/bin/../lib/apache-rat-tasks-0.6.jar:/home/hadoop/installation/zookeeper-3.3.4/bin/../lib/apache-rat-core-0.6.jar:/home/hadoop/installation/zookeeper-3.3.4/bin/../src/java/lib/*.jar:/home/hadoop/installation/zookeeper-3.3.4/bin/../conf:/home/hadoop/installation/jdk1.6.0_30/lib/*.jar:/home/hadoop/installation/jdk1.6.0_30/jre/lib/*.jar092013-10-28 07:14:21,111 - INFO [main:Environment@97] - Client environment:java.library.path=/home/hadoop/installation/jdk1.6.0_30/jre/lib/i386/client:/home/hadoop/installation/jdk1.6.0_30/jre/lib/i386:/home/hadoop/installation/jdk1.6.0_30/jre/../lib/i386:/usr/java/packages/lib/i386:/lib:/usr/lib102013-10-28 07:14:21,116 - INFO [main:Environment@97] - Client environment:java.io.tmpdir=/tmp112013-10-28 07:14:21,124 - INFO [main:Environment@97] - Client environment:java.compiler=<NA>122013-10-28 07:14:21,169 - INFO [main:Environment@97] - Client environment:os.name=Linux132013-10-28 07:14:21,175 - INFO [main:Environment@97] - Client environment:os.arch=i386142013-10-28 07:14:21,177 - INFO [main:Environment@97] - Client environment:os.version=3.0.0-14-generic152013-10-28 07:14:21,185 - INFO [main:Environment@97] - Client environment:user.name=hadoop162013-10-28 07:14:21,188 - INFO [main:Environment@97] - Client environment:user.home=/home/hadoop172013-10-28 07:14:21,190 - INFO [main:Environment@97] - Client environment:user.dir=/home/hadoop/installation/zookeeper-3.3.4182013-10-28 07:14:21,197 - INFO [main:ZooKeeper@379] - Initiating client connection, connectString=zk-01:2181 sessionTimeout=30000 watcher=org.apache.zookeeper.ZooKeeperMain$MyWatcher@bf32c192013-10-28 07:14:21,305 - INFO [main-SendThread():ClientCnxn$SendThread@1061] - Opening socket connection to server zk-01/192.168.0.179:218120Welcome to ZooKeeper!212013-10-28 07:14:21,376 - INFO [main-SendThread(zk-01:2181):ClientCnxn$SendThread@950] - Socket connection established to zk-01/192.168.0.179:2181, initiating session22JLine support is enabled23[zk: zk-01:2181(CONNECTING) 0] 2013-10-28 07:14:21,872 - INFO [main-SendThread(zk-01:2181):ClientCnxn$SendThread@739] - Session establishment complete on server zk-01/192.168.0.179:2181, sessionid = 0x134bdcd6b730000, negotiated timeout = 300002425WATCHER::2627WatchedEvent state:SyncConnected type:None path:null2829[zk: zk-01:2181(CONNECTED) 0] ls /30[zookeeper]当前根路径为/zookeeper。
总结说明
主机名与IP地址映射配置问题
启动ZooKeeper集群时，如果ZooKeeper集群中zk-01结点的日志出现如下错误：
01java.net.SocketTimeoutException02 at sun.nio.ch.SocketAdaptor.connect(SocketAdaptor.java:109)03 at org.apache.zookeeper.server.quorum.QuorumCnxManager.connectOne(QuorumCnxManager.java:371)04 at org.apache.zookeeper.server.quorum.QuorumCnxManager.connectAll(QuorumCnxManager.java:404)05 at org.apache.zookeeper.server.quorum.FastLeaderElection.lookForLeader(FastLeaderElection.java:688)06 at org.apache.zookeeper.server.quorum.QuorumPeer.run(QuorumPeer.java:622)072013-10-28 06:37:46,026 - INFO [QuorumPeer:/0:0:0:0:0:0:0:0:2181:FastLeaderElection@697] - Notification time out: 6400082013-10-28 06:37:57,431 - WARN [QuorumPeer:/0:0:0:0:0:0:0:0:2181:QuorumCnxManager@384] - Cannot open channel to 2 at election address zk-02/202.106.199.35:388809java.net.SocketTimeoutException10 at sun.nio.ch.SocketAdaptor.connect(SocketAdaptor.java:109)11 at org.apache.zookeeper.server.quorum.QuorumCnxManager.connectOne(QuorumCnxManager.java:371)12 at org.apache.zookeeper.server.quorum.QuorumCnxManager.connectAll(QuorumCnxManager.java:404)13 at org.apache.zookeeper.server.quorum.FastLeaderElection.lookForLeader(FastLeaderElection.java:688)14 at org.apache.zookeeper.server.quorum.QuorumPeer.run(QuorumPeer.java:622)152013-10-28 06:38:02,442 - WARN [QuorumPeer:/0:0:0:0:0:0:0:0:2181:QuorumCnxManager@384] - Cannot open channel to 3 at election address zk-03/202.106.199.35:3888很显然，zk-01在启动时连接集群中其他结点（zk-02、zk-03）时，主机名映射的IP与我们实际配置的不一致，所以集群中各个结点之间无法建立链路，整个ZooKeeper集群启动是失败的。
上面错误日志中zk-02/202.106.199.35:3888实际应该是zk-02/202.192.168.0.178:3888就对了，但是在进行域名解析的时候映射有问题，修改每个结点的/etc/hosts文件，将ZooKeeper集群中所有结点主机名到IP地址的映射配置上。
参考链接
下面是我整理搜集的有关ZooKeeper相关内容的网址，可以学习参考。
中文链接：
- http://agapple.iteye.com/blog/1111377
- http://agapple.iteye.com/blog/1112032
- http://agapple.iteye.com/blog/1292129
- http://agapple.iteye.com/blog/1184023
- http://agapple.iteye.com/blog/1184040
- http://www.ibm.com/developerworks/cn/opensource/os-cn-zookeeper/
- http://luzengyi.blog.163.com/blog/static/529188201064113744373/
- http://luzengyi.blog.163.com/blog/static/529188201061155444869/
英文链接：
- http://zookeeper.apache.org/doc/trunk/zookeeperStarted.html
- http://zookeeper.apache.org/doc/r3.3.4/zookeeperOver.html
- http://zookeeper.apache.org/doc/r3.3.4/recipes.html
- http://zookeeper.apache.org/doc/trunk/
- http://wiki.apache.org/hadoop/ZooKeeper/Tutorial
- http://wiki.apache.org/hadoop/ZooKeeper/FAQ
- http://wiki.apache.org/hadoop/ZooKeeper/Troubleshooting
本文基于署名-非商业性使用-相同方式共享 4.0许可协议发布，欢迎转载、使用、重新发布，但务必保留文章署名时延军（包含链接：http://shiyanjun.cn），不得用于商业目的，基于本文修改后的作品务必以相同的许可发布。如有任何疑问，请与我联系。
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