ZooKeeper分享之集群安装配置
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、名字服务、分布式同步、组服务等。
ZooKeeper的目标就是封装好复杂易出错的关键服务，将简单易用的接口和性能高效、功能稳定的系统提供给用户。
ZooKeeper代码版本中，提供了分布式独享锁、选举、队列的接口，代码在zookeeper-3.4.6\src\recipes。其中分布锁和队列有Java和C两个版本，选举只有Java版本。
环境：centos6.5 64位 三台
zookeeper：3.4.6
IP：10.161.217.220 iZ23qc8j36hZ（主机名）
10.162.80.105 iZ23er03f1bZ
10.117.7.209 iZ23ea7avfrZ
开始安装前需要修改hosts
vim /etc/hosts
在host下面添加
10.117.7.209 iZ23ea7avfrZ
10.161.217.220 iZ23qc8j36hZ
10.162.80.105 iZ23er03f1bZ
1、三台主机安装java
yum -y install java-1.7.0-openjdk*
2、三台主机下载解压
wget http://www.us.apache.org/dist/zookeeper/zookeeper-3.4.6/zookeeper-3.4.6.tar.gz
tar -zxvf zookeeper-3.4.6.tar.gz
3、三台主机配置zoo.cfg
a) cp zoo_sample.cfg zoo.cfg
b) 修改zoo.cfg
tickTime=2000
initLimit=10
syncLimit=5
clientPort=2181
dataDir=/usr/local/zookeeper-3.4.6/pid
server.1=iZ23qc8j36hZ:2888:3888
server.2=iZ23er03f1bZ:2888:3888
server.3=iZ23ea7avfrZ:2888:3888
#注释： 集群的 节点配置 必须是 server.X=Host:2888:3888
其中 ：2888、3888用于zookeeper之间的通讯
server.X 中的 X 用于 下面myid中的值
tickTime：这个时间是作为 Zookeeper 服务器之间或客户端与服务器之间维持心跳的时间间隔，也就是每个 tickTime 时间就会发送一个心跳。
dataDir：顾名思义就是 Zookeeper 保存数据的目录，默认情况下，Zookeeper 将写数据的日志文件也保存在这个目录里。
clientPort：这个端口就是客户端连接 Zookeeper 服务器的端口，Zookeeper 会监听这个端口，接受客户端的访问请求。
initLimit: zookeeper集群中的包含多台server, 其中一台为leader, 集群中其余的server为follower. initLimit参数配置初始化连接时, follower和leader之间的最长心跳时间. 此时该参数设置为5, 说明时间限制为5倍tickTime, 即5*2000=10000ms=10s.
syncLimit: 该参数配置leader和follower之间发送消息, 请求和应答的最大时间长度. 此时该参数设置为2, 说明时间限制为2倍tickTime, 即4000ms.
server.X=A:B:C 其中X是一个数字, 表示这是第几号server. A是该server所在的IP地址. B配置该server和集群中的leader交换消息所使用的端口. C配置选举leader时所使用的端口. 由于配置的是伪集群模式, 所以各个server的B, C参数必须不同.
4、 创建myid
三台主机下面分别创建目录pid
mkdir pid （本人安装在/usr/local/zookeeper-3.4.6）
cd /usr/local/zookeeper-3.4.6/pid
echo 1 > myid
注意： echo 1 中的 1 对应着server.X中的X的值 如果是在iZ23er03f1bZ服务器上需要执行echo 1 > myid
5、启动zookeeper server
分别在/usr/local/zookeeper-3.4.6/bin目录下启动服务
zkServer.sh start
6、 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：
[root@iZ23qc8j36hZ bin]# ./zkServer.sh status JMX enabled by default Using config: /usr/local/zookeeper-3.4.6/bin/../conf/zoo.cfg Mode: follower [root@iZ23er03f1bZ bin]# ./zkServer.sh status JMX enabled by default Using config: /usr/local/zookeeper-3.4.6/bin/../conf/zoo.cfg Mode: leader [root@iZ23ea7avfrZ bin]# ./zkServer.sh status JMX enabled by default Using config: /usr/local/zookeeper-3.4.6/bin/../conf/zoo.cfg Mode: follower
通过上面状态查询结果可见，iZ23er03f1bZ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。
总结说明
日志查看在/usr/local/zookeeper-3.4.6/bin/zookeeper.out （系统默认的）
启动ZooKeeper集群时，如果ZooKeeper集群中iZ23er03f1bZ结点的日志出现如下错误：
2015-10-29 13:46:12,581 [myid:1] - INFO [Thread-1:QuorumCnxManager$Listener@504] - My election bind port: iZ23qc8j36hZ/10.161.217.220:3888 2015-10-29 13:46:12,598 [myid:1] - INFO [QuorumPeer[myid=1]/0.0.0.0:2181:QuorumPeer@714] - LOOKING 2015-10-29 13:46:12,603 [myid:1] - INFO [QuorumPeer[myid=1]/0.0.0.0:2181:FastLeaderElection@815] - New election. My id = 1, proposed zxid=0x0 2015-10-29 13:46:12,608 [myid:1] - INFO [WorkerReceiver[myid=1]:FastLeaderElection@597] - Notification: 1 (message format version), 1 (n.leader), 0x0 (n.zxid), 0x1 (n.round), LOOKING (n.state), 1 (n.sid), 0x0 (n.peerEpoch) LOOKING (my state) 2015-10-29 13:46:12,622 [myid:1] - WARN [WorkerSender[myid=1]:QuorumCnxManager@382] - Cannot open channel to 2 at election address iZ23er03f1bZ/10.162.80.105:3888 java.net.ConnectException: Connection refused at java.net.PlainSocketImpl.socketConnect(Native Method) at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:339) at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:200) at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:182) at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392) at java.net.Socket.connect(Socket.java:579) at org.apache.zookeeper.server.quorum.QuorumCnxManager.connectOne(QuorumCnxManager.java:368) at org.apache.zookeeper.server.quorum.QuorumCnxManager.toSend(QuorumCnxManager.java:341) at org.apache.zookeeper.server.quorum.FastLeaderElection$Messenger$WorkerSender.process(FastLeaderElection.java:449) at org.apache.zookeeper.server.quorum.FastLeaderElection$Messenger$WorkerSender.run(FastLeaderElection.java:430) at java.lang.Thread.run(Thread.java:745) 2015-10-29 13:46:12,627 [myid:1] - WARN [WorkerSender[myid=1]:QuorumCnxManager@382] - Cannot open channel to 3 at election address iZ23ea7avfrZ/10.117.7.209:3888 java.net.ConnectException: Connection refused at java.net.PlainSocketImpl.socketConnect(Native Method) at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:339) at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:200) at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:182) at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392) at java.net.Socket.connect(Socket.java:579) at org.apache.zookeeper.server.quorum.QuorumCnxManager.connectOne(QuorumCnxManager.java:368) at org.apache.zookeeper.server.quorum.QuorumCnxManager.toSend(QuorumCnxManager.java:341) at org.apache.zookeeper.server.quorum.FastLeaderElection$Messenger$WorkerSender.process(FastLeaderElection.java:449) at org.apache.zookeeper.server.quorum.FastLeaderElection$Messenger$WorkerSender.run(FastLeaderElection.java:430) at java.lang.Thread.run(Thread.java:745) 2015-10-29 13:46:12,812 [myid:1] - WARN [QuorumPeer[myid=1]/0.0.0.0:2181:QuorumCnxManager@382] - Cannot open channel to 2 at election address iZ23er03f1bZ/10.162.80.105:3888 java.net.ConnectException: Connection refused at java.net.PlainSocketImpl.socketConnect(Native Method) at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:339) at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:200) at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:182) at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392) at java.net.Socket.connect(Socket.java:579) at org.apache.zookeeper.server.quorum.QuorumCnxManager.connectOne(QuorumCnxManager.java:368) at org.apache.zookeeper.server.quorum.QuorumCnxManager.connectAll(QuorumCnxManager.java:402) at org.apache.zookeeper.server.quorum.FastLeaderElection.lookForLeader(FastLeaderElection.java:840) at org.apache.zookeeper.server.quorum.QuorumPeer.run(QuorumPeer.java:762) 2015-10-29 13:46:12,815 [myid:1] - WARN [QuorumPeer[myid=1]/0.0.0.0:2181:QuorumCnxManager@382] - Cannot open channel to 3 at election address iZ23ea7avfrZ/10.117.7.209:3888 java.net.ConnectException: Connection refused at java.net.PlainSocketImpl.socketConnect(Native Method) at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:339) at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:200) at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:182) at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392) at java.net.Socket.connect(Socket.java:579) at org.apache.zookeeper.server.quorum.QuorumCnxManager.connectOne(QuorumCnxManager.java:368) at org.apache.zookeeper.server.quorum.QuorumCnxManager.connectAll(QuorumCnxManager.java:402) at org.apache.zookeeper.server.quorum.FastLeaderElection.lookForLeader(FastLeaderElection.java:840) at org.apache.zookeeper.server.quorum.QuorumPeer.run(QuorumPeer.java:762) 2015-10-29 13:46:12,815 [myid:1] - INFO [QuorumPeer[myid=1]/0.0.0.0:2181:FastLeaderElection@849] - Notification time out: 400 2015-10-29 13:46:13,217 [myid:1] - WARN [QuorumPeer[myid=1]/0.0.0.0:2181:QuorumCnxManager@382] - Cannot open channel to 2 at election address iZ23er03f1bZ/10.162.80.105:3888 java.net.ConnectException: Connection refused at java.net.PlainSocketImpl.socketConnect(Native Method) at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:339) at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:200) at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:182) at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392) at java.net.Socket.connect(Socket.java:579) at org.apache.zookeeper.server.quorum.QuorumCnxManager.connectOne(QuorumCnxManager.java:368) at org.apache.zookeeper.server.quorum.QuorumCnxManager.connectAll(QuorumCnxManager.java:402) at org.apache.zookeeper.server.quorum.FastLeaderElection.lookForLeader(FastLeaderElection.java:840) at org.apache.zookeeper.server.quorum.QuorumPeer.run(QuorumPeer.java:762) 2015-10-29 13:46:13,220 [myid:1] - WARN [QuorumPeer[myid=1]/0.0.0.0:2181:QuorumCnxManager@382] - Cannot open channel to 3 at election address iZ23ea7avfrZ/10.117.7.209:3888 java.net.ConnectException: Connection refused at java.net.PlainSocketImpl.socketConnect(Native Method) at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:339) at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:200) at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:182) at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392) at java.net.Socket.connect(Socket.java:579) at org.apache.zookeeper.server.quorum.QuorumCnxManager.connectOne(QuorumCnxManager.java:368) at org.apache.zookeeper.server.quorum.QuorumCnxManager.connectAll(QuorumCnxManager.java:402) at org.apache.zookeeper.server.quorum.FastLeaderElection.lookForLeader(FastLeaderElection.java:840) at org.apache.zookeeper.server.quorum.QuorumPeer.run(QuorumPeer.java:762) 2015-10-29 13:46:13,220 [myid:1] - INFO [QuorumPeer[myid=1]/0.0.0.0:2181:FastLeaderElection@849] - Notification time out: 800 2015-10-29 13:46:14,022 [myid:1] - WARN [QuorumPeer[myid=1]/0.0.0.0:2181:QuorumCnxManager@382] - Cannot open channel to 2 at election address iZ23er03f1bZ/10.162.80.105:3888 java.net.ConnectException: Connection refused at java.net.PlainSocketImpl.socketConnect(Native Method) at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:339) at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:200) at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:182) at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392) at java.net.Socket.connect(Socket.java:579) at org.apache.zookeeper.server.quorum.QuorumCnxManager.connectOne(QuorumCnxManager.java:368) at org.apache.zookeeper.server.quorum.QuorumCnxManager.connectAll(QuorumCnxManager.java:402) at org.apache.zookeeper.server.quorum.FastLeaderElection.lookForLeader(FastLeaderElection.java:840) at org.apache.zookeeper.server.quorum.QuorumPeer.run(QuorumPeer.java:762) 2015-10-29 13:46:14,025 [myid:1] - WARN [QuorumPeer[myid=1]/0.0.0.0:2181:QuorumCnxManager@382] - Cannot open channel to 3 at election address iZ23ea7avfrZ/10.117.7.209:3888 java.net.ConnectException: Connection refused at java.net.PlainSocketImpl.socketConnect(Native Method) at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:339) at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:200) at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:182) at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392) at java.net.Socket.connect(Socket.java:579) at org.apache.zookeeper.server.quorum.QuorumCnxManager.connectOne(QuorumCnxManager.java:368) at org.apache.zookeeper.server.quorum.QuorumCnxManager.connectAll(QuorumCnxManager.java:402) at org.apache.zookeeper.server.quorum.FastLeaderElection.lookForLeader(FastLeaderElection.java:840) at org.apache.zookeeper.server.quorum.QuorumPeer.run(QuorumPeer.java:762) 2015-10-29 13:46:14,030 [myid:1] - INFO [QuorumPeer[myid=1]/0.0.0.0:2181:FastLeaderElection@849] - Notification time out: 1600 2015-10-29 13:46:15,633 [myid:1] - WARN [QuorumPeer[myid=1]/0.0.0.0:2181:QuorumCnxManager@382] - Cannot open channel to 2 at election address iZ23er03f1bZ/10.162.80.105:3888 java.net.ConnectException: Connection refused at java.net.PlainSocketImpl.socketConnect(Native Method) at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:339) at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:200) at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:182) at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392) at java.net.Socket.connect(Socket.java:579) at org.apache.zookeeper.server.quorum.QuorumCnxManager.connectOne(QuorumCnxManager.java:368) at org.apache.zookeeper.server.quorum.QuorumCnxManager.connectAll(QuorumCnxManager.java:402) at org.apache.zookeeper.server.quorum.FastLeaderElection.lookForLeader(FastLeaderElection.java:840) at org.apache.zookeeper.server.quorum.QuorumPeer.run(QuorumPeer.java:762) 2015-10-29 13:46:15,636 [myid:1] - WARN [QuorumPeer[myid=1]/0.0.0.0:2181:QuorumCnxManager@382] - Cannot open channel to 3 at election address iZ23ea7avfrZ/10.117.7.209:3888 java.net.ConnectException: Connection refused at java.net.PlainSocketImpl.socketConnect(Native Method) at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:339) at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:200) at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:182) at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392) at java.net.Socket.connect(Socket.java:579) at org.apache.zookeeper.server.quorum.QuorumCnxManager.connectOne(QuorumCnxManager.java:368) at org.apache.zookeeper.server.quorum.QuorumCnxManager.connectAll(QuorumCnxManager.java:402) at org.apache.zookeeper.server.quorum.FastLeaderElection.lookForLeader(FastLeaderElection.java:840) at org.apache.zookeeper.server.quorum.QuorumPeer.run(QuorumPeer.java:762) 2015-10-29 13:46:15,640 [myid:1] - INFO [QuorumPeer[myid=1]/0.0.0.0:2181:FastLeaderElection@849] - Notification time out: 3200 2015-10-29 13:46:18,842 [myid:1] - WARN [QuorumPeer[myid=1]/0.0.0.0:2181:QuorumCnxManager@382] - Cannot open channel to 2 at election address iZ23er03f1bZ/10.162.80.105:3888 java.net.ConnectException: Connection refused at java.net.PlainSocketImpl.socketConnect(Native Method) at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:339) at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:200) at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:182) at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392) at java.net.Socket.connect(Socket.java:579) at org.apache.zookeeper.server.quorum.QuorumCnxManager.connectOne(QuorumCnxManager.java:368) at org.apache.zookeeper.server.quorum.QuorumCnxManager.connectAll(QuorumCnxManager.java:402) at org.apache.zookeeper.server.quorum.FastLeaderElection.lookForLeader(FastLeaderElection.java:840) at org.apache.zookeeper.server.quorum.QuorumPeer.run(QuorumPeer.java:762) 2015-10-29 13:46:18,845 [myid:1] - WARN [QuorumPeer[myid=1]/0.0.0.0:2181:QuorumCnxManager@382] - Cannot open channel to 3 at election address iZ23ea7avfrZ/10.117.7.209:3888 java.net.ConnectException: Connection refused at java.net.PlainSocketImpl.socketConnect(Native Method) at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:339) at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:200) at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:182) at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392) at java.net.Socket.connect(Socket.java:579) at org.apache.zookeeper.server.quorum.QuorumCnxManager.connectOne(QuorumCnxManager.java:368) at org.apache.zookeeper.server.quorum.QuorumCnxManager.connectAll(QuorumCnxManager.java:402) at org.apache.zookeeper.server.quorum.FastLeaderElection.lookForLeader(FastLeaderElection.java:840) at org.apache.zookeeper.server.quorum.QuorumPeer.run(QuorumPeer.java:762) 2015-10-29 13:46:18,846 [myid:1] - INFO [QuorumPeer[myid=1]/0.0.0.0:2181:FastLeaderElection@849] - Notification time out: 6400 2015-10-29 13:46:19,749 [myid:1] - INFO [iZ23qc8j36hZ/10.161.217.220:3888:QuorumCnxManager$Listener@511] - Received connection request /10.162.80.105:51983 2015-10-29 13:46:19,760 [myid:1] - INFO [WorkerReceiver[myid=1]:FastLeaderElection@597] - Notification: 1 (message format version), 2 (n.leader), 0x0 (n.zxid), 0x1 (n.round), LOOKING (n.state), 2 (n.sid), 0x0 (n.peerEpoch) LOOKING (my state) 2015-10-29 13:46:19,760 [myid:1] - INFO [WorkerReceiver[myid=1]:FastLeaderElection@597] - Notification: 1 (message format version), 2 (n.leader), 0x0 (n.zxid), 0x1 (n.round), LOOKING (n.state), 1 (n.sid), 0x0 (n.peerEpoch) LOOKING (my state) 2015-10-29 13:46:19,762 [myid:1] - WARN [WorkerSender[myid=1]:QuorumCnxManager@382] - Cannot open channel to 3 at election address iZ23ea7avfrZ/10.117.7.209:3888 java.net.ConnectException: Connection refused at java.net.PlainSocketImpl.socketConnect(Native Method) at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:339) at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:200) at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:182) at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392) at java.net.Socket.connect(Socket.java:579) at org.apache.zookeeper.server.quorum.QuorumCnxManager.connectOne(QuorumCnxManager.java:368) at org.apache.zookeeper.server.quorum.QuorumCnxManager.toSend(QuorumCnxManager.java:341) at org.apache.zookeeper.server.quorum.FastLeaderElection$Messenger$WorkerSender.process(FastLeaderElection.java:449) at org.apache.zookeeper.server.quorum.FastLeaderElection$Messenger$WorkerSender.run(FastLeaderElection.java:430) at java.lang.Thread.run(Thread.java:745) 2015-10-29 13:46:19,961 [myid:1] - INFO [QuorumPeer[myid=1]/0.0.0.0:2181:QuorumPeer@784] - FOLLOWING 2015-10-29 13:46:19,969 [myid:1] - INFO [QuorumPeer[myid=1]/0.0.0.0:2181:Learner@86] - TCP NoDelay set to: true 2015-10-29 13:46:19,979 [myid:1] - INFO [QuorumPeer[myid=1]/0.0.0.0:2181:Environment@100] - Server environment:zookeeper.version=3.4.6-1569965, built on 02/20/2014 09:09 GMT
这个是正常现象，因为你在启动过程中一定有先后的，当你第一台启动的时候后面的还没启动 所有就报错了。所有都启动后就
最后推荐大家几个管理工具 Node_Zookeeper_Admin 、node-zk-browser 具体请大家自己google吧
本人私人blog希望大家光临 http://www.ccblog.cn/index.htm
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1.7 zk 的配置管理服务 1.8 zk 的集群管理 1.9 zk 的分布式锁 2.0 zk 队列管理 2.1 zk 数据复制 2.2 zk 的工作原理 2.3 zk 是如何保证事物的顺序一致性 2.4 zk 集群下 server 工作状态 2.5 zk 是如何选举 Leader 的...
1. **安装与配置**：介绍如何在不同操作系统上安装配置ZooKeeper，并设置集群环境。 2. **基本操作**：讲解如何进行读写操作、创建节点以及删除节点等基本操作。 3. **高级特性**：深入探讨ZooKeeper提供的高级功能...
【Zookeeper】：Zookeeper是Apache的一个开源项目，它是为分布式应用提供一致性服务的软件，如命名服务、配置管理、集群管理等。在Dubbo中，Zookeeper常被用作服务注册与发现的注册中心。每个服务提供者启动时，会将...
Zookeeper 是一个分布式的，开放源码的分布式应用程序协调服务，它是集群的管理者，监视着集群中各个节点的状态根据节点提交的反馈进行下一步合理操作。最终将简单易用的接口和性能高效、功能稳定的系统提供给用户。...
Zookeeper的主要功能包括命名服务、配置管理、集群同步、领导者选举等。它的设计目标是简化分布式系统的开发，提供了一套简单易用的API，使得开发者可以轻松实现分布式锁、队列、事件监听等功能。 在《Paxos到...
2. **Zookeeper架构**：讲解Zookeeper的集群架构，包括服务器角色（Leader、Follower、Observer）、数据复制和选举机制。学习者会理解到Zookeeper如何通过Paxos算法实现高可用和一致性。 3. **API使用**：视频会...
ZooKeeper是一款分布式的、开放源码的分布式应用程序协调服务，最初是由Google设计实现...作者提到了自己最初对ZooKeeper的认识，以及通过学习和实践逐渐深入理解的过程，鼓励大家分享知识，共同促进知识的更新与进步。
1. **安装**：解压`zookeeper-3.5.3-beta.tar.gz`，配置环境变量，启动ZooKeeper服务。 2. **客户端操作**：使用命令行客户端`zkCli.sh`，或者集成到Java应用程序中，通过ZooKeeper的Java API进行数据操作。 3. **...
书中的具体内容包括了ZooKeeper集群的部署和配置，以及如何在集群中创建、更新、删除和查询数据节点。此外，还介绍了ZooKeeper在分布式环境中解决常见问题的方案，例如分布式锁的实现、配置管理的最佳实践以及如何...
Zookeeper是Apache的一个分布式协调服务，它是基于分布式应用程序的配置管理、命名服务、集群管理和同步服务的工具。在Dubbo中，Zookeeper作为服务注册中心，负责存储和查找服务提供者和消费者的信息。 在这个...
### HBase 1.2 分布式安装分享 #### 一、概述 HBase是Apache Hadoop生态系统中的一个重要的组成部分，它提供了一种分布式的、面向列的存储系统，能够处理非常大量的数据，并且可以实时地进行读写操作。本文档主要...
安装HBase时，需要考虑集群的Zookeeper配置，因为Zookeeper用于协调HBase的各个组件。 Oozie是Hadoop的工作流调度器，用于管理Hadoop作业（包括MapReduce、Pig、Hive、Sqoop等）和Spark作业的调度。配置Oozie时，...
由于作者在实践中发现许多书籍中的安装步骤存在一些问题，尤其是权限问题，所以作者根据个人的环境总结出了一套安装流程，并分享了从VMware虚拟机环境到HBase集群搭建的整个过程，但没有深入解释每个步骤的原理。...
总结来说，这个教程覆盖了从基础环境准备到集群配置、启动、监控和故障恢复的整个流程，对理解Hadoop HA和Zookeeper的角色至关重要。在实践中，需要按照步骤仔细操作，确保每个环节都正确无误，才能构建出一个可靠的...
同时，书中也会介绍如何在实际项目中部署和运维Zookeeper集群，以及如何处理常见的故障和性能优化问题。 在分布式一致性实践部分，作者可能会分享实际案例，展示如何利用Zookeeper解决实际问题，如数据库复制、负载...