Shulou(Shulou.com)06/02 Report--

This article mainly introduces "the installation and use of zookeeper". In the daily operation, I believe that many people have doubts about the installation and use of zookeeper. The editor consulted all kinds of materials and sorted out simple and easy-to-use operation methods. I hope it will be helpful to answer the doubts about "installation and use of zookeeper". Next, please follow the editor to study!

1 zookeeper data storage form

The user's data is stored in kv form in zookeeper.

Key: it is expressed in the form of a path, and each key has a parent-child relationship, such as / top-level key

The key created by the user can only be used as a child node under /. For example, the key of building a key: / aa can carry value data.

You can also build a key: / bb

You can also build multiple key: / aa/xx

In zookeeper, the key for each data is called a znode.

2 znode Typ

There are several types of znode in zookeeper:

1. PERSISTENT persistent: even if the creator is disconnected from the cluster, such nodes will persist in the zk cluster.

2. EPHEMERAL is short-lived: once the creator disconnects from the cluster, zk will delete this node

3. SEQUENTIAL with sequence number: for this kind of nodes, zk will automatically assemble a sequence number, and the sequence number is incremented.

Type of combination:

PERSISTENT: persistent without serial number

EPHEMERAL: temporarily without serial number

PERSISTENT and SEQUENTIAL: persistent and numbered

EPHEMERAL and SEQUENTIAL: short and numbered

3 install zookeeper

Extract the installation package zookeeper-3.4.6.tar.gz

Modify conf/zoo.cfg

# The number of milliseconds of each ticktickTime=2000# The number of ticks that the initial # synchronization phase can takeinitLimit=10# The number of ticks that can pass between # sending a request and getting an acknowledgementsyncLimit=5# the directory where the snapshot is stored.# do not use / tmp for storage / tmp here is just # example sakes.dataDir=/usr/local/bigdata/data/zkdata# the port at which the clients will connectclientPort=2181# the maximum number of client connections.# increase this if you need to handle more clients#maxClientCnxns=60## Be sure to read the maintenance section of the # administrator guide before turning on autopurge.## http://zookeeper.apache.org/doc/current/zookeeperAdmin.html#sc_maintenance## The number of snapshots to retain in dataDir#autopurge.snapRetainCount=3# Purge task interval in hours# Set to "0" to disable Autopurge feature#autopurge.purgeInterval=1server.1=Master:2888:3888server.2=Slave01:2888:3888server.3=Slave02:2888:3888

Create a directory / usr/local/bigdata/data/zkdata for all three nodes

For 3 nodes, generate myid files in the working directory, but the contents should be their respective id: 1, 2, 3

On Master: echo 1 > / usr/local/bigdata/data/zkdata/myidSlave01: echo 2 > / usr/local/bigdata/data/zkdata/myidSlave02: echo 3 > / usr/local/bigdata/data/zkdata/myid4 start the zookeeper cluster

Zookeeper does not provide automatic batch startup scripts, so you need to manually start the zookeeper process one by one on each node and run the command:

$bin/zkServer.sh start

After startup, you should be able to see a process with jps: QuorumPeerMain

View statu

$bin/zkServer.sh status5 write startup script zkmanage.sh

Zookeeper does not provide batch scripts, like hadoop can not start all nodes on a machine at the same time, you can write your own scripts to start batch.

$1: refers to receiving the first parameter

Run the command:

Sh zkmanage.sh start # start sh zkmanage.sh stop # stop 6 zookeeper command line client

Start the local client:

$bin/zkCli.sh

Start the client of another machine:

$bin/zkCli.sh-server Master:2181

Basic commands:

View help: help

Check the directory: ls /

View node data: get / zookeeper

Insert data: create / node data, such as create / aa hello

Change the data of a node: set / aa helloworld

Delete data: rmr / aa/bb

Register listener: get / aa watch-- > data changes will be notified; ls / aa watch-- > directories will also be notified of changes

At this point, the study on "installation and use of zookeeper" is over. I hope to be able to solve your doubts. The collocation of theory and practice can better help you learn, go and try it! If you want to continue to learn more related knowledge, please continue to follow the website, the editor will continue to work hard to bring you more practical articles!

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