Zookeeper學習筆記

$tar xvzf zookeeper-3.4.6.tar.gz
....
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$ tree -L 1
|-- zookeeper1
|-- zookeeper2
|-- zookeeper3
|-- zookeeper4
`-- zookeeper5
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# 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=/home/xxxx/programs/zoo/zookeeper1/data
# the port at which the clients will connect
clientPort=2181
server.1=127.0.0.1:2888:3888
server.2=127.0.0.1:2889:3889
server.3=127.0.0.1:2890:3890
server.4=127.0.0.1:2891:3891
server.5=127.0.0.1:2892:3892
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# 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=/home/xxxx/programs/zoo/zookeeper2/data
# the port at which the clients will connect
clientPort=2182
server.1=127.0.0.1:2888:3888
server.2=127.0.0.1:2889:3889
server.3=127.0.0.1:2890:3890
server.4=127.0.0.1:2891:3891
server.5=127.0.0.1:2892:3892
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server.serverid=serverhost:leader_listent_port:quorum_port
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$ echo "1" > /home/xxxx/programs/zoo/zookeeper1/data/myid
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java.lang.IllegalArgumentException: /home/xxxx/programs/zoo/zookeeper1/data/myid file is missing
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$ zookeeper1/bin/zkServer.sh start
$ zookeeper2/bin/zkServer.sh start
$ zookeeper3/bin/zkServer.sh start
$ zookeeper4/bin/zkServer.sh start
$ zookeeper5/bin/zkServer.sh start
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$ zookeeper1/bin/zkServer.sh status
JMX enabled by default
Using config: /home/xxxx/programs/zoo/zookeeper1/bin/../conf/zoo.cfg
Error contacting service. It is probably not running.
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$ zookeeper3/bin/zkServer.sh status
JMX enabled by default
Using config: /home/xxxx/programs/zoo/zookeeper3/bin/../conf/zoo.cfg
Mode: leader
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$ zookeeper2/bin/zkServer.sh status
JMX enabled by default
Using config: /home/xxxx/programs/zoo/zookeeper2/bin/../conf/zoo.cfg
Mode: follower
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$ zookeeper3/bin/zkServer.sh stop
$ zookeeper3/bin/zkServer.sh restart
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 <dependency>
      <groupId>org.apache.zookeeper</groupId>
       <artifactId>zookeeper</artifactId>
       <version>3.4.6</version>
 </dependency>
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public class ZookeeperTest {

    final public static String IP = "10.2.38.198";
    final public static String CLIENTPORT = "2181";
    final public static int CONNECTION_TIMEOUT = 2000;

    public static void main(String[] args) throws InterruptedException {
        ZooKeeper zk = null;
        try {
            //和zookeeper伺服器叢集建立連線，並設定Watcher
             zk = new ZooKeeper(IP + ":" + CLIENTPORT, CONNECTION_TIMEOUT, new Watcher() {

                @Override
                public void process(WatchedEvent watchedEvent) {

        System.out.println("事件" + watchedEvent.getType() + "發生");
                }
            });
            //建立永久節點
            zk.create("/testPath", "testData".getBytes(), ZooDefs.Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT);
            //建立永久子節點
            zk.create("/testPath/testChildPath1", "testChildData1".getBytes(),
                    ZooDefs.Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT);
            //獲取/testPath節點的資料
            System.out.println(new String(zk.getData("/testPath", true, null)));
            //獲取/testPath/testChildPath1節點資料
String(zk.getData("/testPath/testChildPath1", true, null), "utf-8"));
            //修改/testPath/testChildPath1節點資料
            zk.setData("/testPath/testChildPath1", "修改後testChildData1".getBytes("utf-8"), -1);
            //獲取/testPath/testChildPath1節點資料
            System.out.println(new String(zk.getData("/testPath/testChildPath1", true, null), "utf-8"));
            //建立永久子節點
            zk.create("/testPath/testChildPath2", "testChildDataTwo".getBytes(),
                    ZooDefs.Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT);
            //獲取/testPath/testChildPath2節點資料
            System.out.println(new String(zk.getData("/testPath/testChildPath2", true, null)));
            // 刪除子目錄節點
            zk.delete("/testPath/testChildPath2", -1);
            zk.delete("/testPath/testChildPath1", -1);
            // 刪除父目錄節點
            zk.delete("/testPath", -1);
        } catch (IOException e) {
            e.printStackTrace();
        } catch (InterruptedException e) {
            e.printStackTrace();
        } catch (KeeperException e) {
            e.printStackTrace();
        } finally {
            if(zk != null) {
                //關閉連線
                zk.close();
            }
        }
    }
}
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