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zookeeper learn

参数配置

  • tickTime

Length of a single tick, in milliseconds. ZooKeeper uses tick as the basic time unit to regulate timeouts. Default is 2000.

  • initLimit

Number of ticks after which the ZooKeeper server times out during the synchronization process. Default is 10.

  • syncLimit

Maximum number of ticks for the followers to wait to synchronize with the leader before the followers time out. Default is 5.

  • dataDir

Absolute path for the ZooKeeper to store the in-memory snapshots of the data and the transactional log of updates to the database.

  • clientPort

Port on which the ZooKeeper server listens for client connections.

  • maxClientCnxns

Maximum number of concurrent connections that a single client can make to a single member of the ZooKeeper ensemble. Default is 10.

终端操作

新増节点

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create [-s] [-e] path data #其中-s 为有序节点,-e临时节点。不写 -s/-e 默认为创建持久化节点

查看节点

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get path

  • 查看节点状态
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    stat path  #返回结果和get命令类似,但不会返回节点数据内容。

修改节点

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set path data [dataVersion]

可以用set命令修改节点数据。也可以基于版本号进行修改,当传入的dataVersion与当前版本号不一致时,zookeeper会拒绝修改。

返回节点列表

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ls   path
ls2 path

删除节点

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delete path [dataVersion]

 与更新节点类似,删除也可以传入版本号,当传入的dataVersion与当前版本号不一致时,zookeeper会拒绝删除。

  • 要想删除某个节点及其后代节点,可以使用递归删除
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    rmr path