Shulou(Shulou.com)06/03 Report--

Why does ZooKeeper (1) use ZooKeeper: https://blog.csdn.net/qq_39468795/article/details/78394253

What is the use of zookeeper command line client and its function testing

First of all, under the bin directory of the zookeeper installation directory, / usr/local/apps/zookeeper-3.4.6/bin has a zkCli.sh command that is used for the client. / zkCli.sh-server hadoop-server-01 (boot 01 this machine) this indicates a successful link [zk: hadoop-server-01 (CONNECTED) 0]. We can use help to see the command zookeeper. Storage data is similar to the tree structure set path data [version] (specify the child node information under this path) such as: ls / (root node) create [- s] [- e] path data acl (create a node) such as: cerate / itcast 500000 get path [watch] (used to view the contents of the node) such as: get / Itcast (that is, look at the contents of the itcast node) set path data [version] (modify the contents of the node) for example, set / itcast 1000000 changes the previous 500000 to 1000000 heartbeat to feel that the other party still exists? Modify the data immediately get path [watch] for example: get / itcast watch (view the contents of itcast and create a listener) once the data is modified, the listener will be notified that the listener will also play a role. After you change the data once, the listener will not work. To re-create the listener (the listener registers once and wants to register again) We use the java program to implement the specific zookeeper function rmr / itcast (delete the itcast in the root directory)

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