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  • zookeeper相关操作

    zookeeper相关命令

    zk服务器端命令

    命令 功能
    zkServer.sh start 启动zookeeper
    zkServer.sh stop 关闭zookeeper
    zkServer.sh restart 重启zookeeper
    zkServer.sh status 查看zookeeper服务状态
    zkCli.sh [-server] [ip:port] 启动zookeeper客户端

    zk客户端命令

    命令 功能
    help 显示所有操作命令
    ls path 查看当前znode子结点
    ls2 path 查看当前znode子结点并显示znode元数据
    create [-s] [-e] path data

    创建znode,并添加数据
    -s:序列节点

    -e:临时节点

    get path 获得znode的值
    set 重新设置znode的值
    stat 查看znode状态
    delete 删除znode
    rmr 递归删除znode
    quit 退出客户端

    znode操作

    普通结点

    [root@zk01 zookeeper]# zkCli.sh -server zk02:2181
    
    [zk: zk02:2181(CONNECTED) 5] ls /
    [zookeeper]
    [zk: zk02:2181(CONNECTED) 6] create /a "abc"
    Created /a
    [zk: zk02:2181(CONNECTED) 7] get /a
    abc

    临时结点

    [zk: zk02:2181(CONNECTED) 8] create -e /b 'bcd'
    Created /b
    [zk: zk02:2181(CONNECTED) 9] ls /
    [a, b, zookeeper]
    
    退出客户端
    [zk: zk02:2181(CONNECTED) 10] quit
    
    WATCHER::
    WatchedEvent state:Closed type:None path:null
    2021-03-06 21:12:34,506 [myid:] - INFO  [main:ZooKeeper@1422] - Session: 0x200002280f00000 closed
    2021-03-06 21:12:34,506 [myid:] - INFO  [main-EventThread:ClientCnxn$EventThread@524] - EventThread shut down for session: 0x200002280f00000
    
    重新连接客户端查看结点
    
    [root@zk01 zookeeper]# zkCli.sh -server zk02:2181
    
    [zk: zk02:2181(CONNECTED) 0] ls /
    [a, zookeeper]

    序列结点

    [zk: zk02:2181(CONNECTED) 0] ls /
    [a, zookeeper]
    [zk: zk02:2181(CONNECTED) 1] create -s /c 'abc'
    Created /c0000000003
    [zk: zk02:2181(CONNECTED) 2] ls /
    [a, c0000000003, zookeeper]
    [zk: zk02:2181(CONNECTED) 3] create -s /c 'abc'
    Created /c0000000004
    
    [zk: zk02:2181(CONNECTED) 8] ls /
    [a, c0000000003, c0000000004, zookeeper]
    
    [zk: zk02:2181(CONNECTED) 10] get /c0000000004
    abc

    查看zookeeper的事务日志

    在ZooKeeper集群启动后,当第一个客户端连接到某个服务器节点时,会创建一个会话,这个会话也是事务,于是创建第一个事务日志,一般名为log.100000001,这里的100000001是这次会话的事务id(zxid)。之后的事务都将写入到这个文件中,直到拍下一个快照。

    [root@zk02 zookeeper]# ll zk*/*
    -rw-r--r-- 1 root root  2 Mar  6 22:51 zkSnapshot/myid
    -rw-r--r-- 1 root root  4 Mar  6 22:52 zkSnapshot/zookeeper_server.pid
    -rw-r--r-- 1 root root  2 Mar  6 22:50 zkTxData/myid
    
    zkSnapshot/version-2:
    total 12
    -rw-r--r-- 1 root root   1 Mar  6 22:52 acceptedEpoch
    -rw-r--r-- 1 root root   1 Mar  6 22:52 currentEpoch
    -rw-r--r-- 1 root root 541 Mar  6 22:52 snapshot.0

    客户端连接zookeeper后查看

    [root@zk02 zookeeper]# ll zk*/*
    -rw-r--r-- 1 root root  2 Mar  6 22:51 zkSnapshot/myid
    -rw-r--r-- 1 root root  4 Mar  6 22:52 zkSnapshot/zookeeper_server.pid
    -rw-r--r-- 1 root root  2 Mar  6 22:50 zkTxData/myid
    
    zkSnapshot/version-2:
    total 12
    -rw-r--r-- 1 root root   1 Mar  6 22:52 acceptedEpoch
    -rw-r--r-- 1 root root   1 Mar  6 22:52 currentEpoch
    -rw-r--r-- 1 root root 541 Mar  6 22:52 snapshot.0
    
    zkTxData/version-2:
    total 8
    -rw-r--r-- 1 root root 67108880 Mar  6 23:07 log.100000001

    如果是事务ZXID5触发的拍快照,那么快照名就是snapshot.ZXID5,拍完后,下一个事务的ID就是ZXID6,于是新的事务日志名为log.ZXID6。

    [root@zk03 zookeeper]# java -cp /opt/module/zookeeper/lib/zookeeper-3.5.5.jar:/opt/module/zookeeper/lib/slf4j-api-1.7.25.jar:/opt/module/zookeeper/lib/zookeeper-jute-3.5.5.jar org.apache.zookeeper.server.LogFormatter /opt/module/zookeeper/zkTxData/version-2/log.100000001 
    SLF4J: Failed to load class "org.slf4j.impl.StaticLoggerBinder".
    SLF4J: Defaulting to no-operation (NOP) logger implementation
    SLF4J: See http://www.slf4j.org/codes.html#StaticLoggerBinder for further details.
    ZooKeeper Transactional Log File with dbid 0 txnlog format version 2
    3/6/21 11:07:22 PM EST session 0x200008a6df70000 cxid 0x0 zxid 0x100000001 createSession 30000
    
    3/6/21 11:09:41 PM EST session 0x200008a6df70000 cxid 0x2 zxid 0x100000002 create '/a,,v{s{31,s{'world,'anyone}}},F,1
    
    3/6/21 11:09:48 PM EST session 0x2
    00008a6df70000
    cxid 0x3 zxid 0x100000003 create '/b,,v{s{31,s{'world,'anyone}}},F,2 3/6/21 11:10:04 PM EST session 0x200008a6df70000 cxid 0x4 zxid 0x100000004 closeSession null 3/6/21 11:10:13 PM EST session 0x200008a6df70001 cxid 0x0 zxid 0x100000005 createSession 30000 EOF reached after 5 txns.
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  • 原文地址:https://www.cnblogs.com/zh-dream/p/14495771.html
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