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

登录

zkCli.sh -server 127.0.0.1:2181

新増节点

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

get path

• 查看节点状态

  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

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

ls   path
ls2  path

删除节点

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

  rmr path