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This article mainly introduces how to install and deploy ZooKeeper, which has a certain reference value, interested friends can refer to, I hope you can learn a lot after reading this article, the following let the editor take you to understand it.

1. Introduction of Zookeeper

Is a reliable coordination system for large-scale distributed systems; the functions include: configuration maintenance, name service, distributed synchronization, group services, etc.; the goal is to encapsulate complex and error-prone key jobs, and provide users with easy-to-use interfaces and systems with efficient performance and stable functions; Zookeeper has become a basic component in the Hadoop ecosystem.

II. Characteristics of Zookeeper

Ultimate consistency: show the client the same view, which is the most important performance of Zookeeper; reliability: if a message is accepted by one server, it will be accepted by all servers; atomicity: updates can only succeed or fail, without intermediate state

2.1 installation of Zookeeper

Zookeeper needs to be installed before JDK is installed. Configure the environment variables.

Download: zookeeper-3.4.5-cdh6.7.0.tar.gz

Decompression

Tar-zxvf zookeeper-3.4.5-cdh6.7.0.tar.gz-C ~ / app/

After decompressing, go to the zookeeper directory and find the conf directory, copy the configuration file and edit it.

Cp zoo_sample.cfg zoo.cfg vi zoo.cfg

Add the following to zoo.cfg

DataDir=/home/hadoop/app/zookeeper-3.4.5-cdh6.7.0/datadataLogDir=/home/hadoop/app/zookeeper-3.4.5-cdh6.7.0/logs

After configuration, enter the bin directory to run

. / zkServer.sh start

View running status

. / zkServer.sh statusJMX enabled by defaultUsing config: / home/hadoop/app/zookeeper-3.4.5-cdh6.7.0/bin/../conf/zoo.cfgMode: standalone

Stop running

. / zkServer.sh stopUsing config: / home/hadoop/app/zookeeper-3.4.5-cdh6.7.0/bin/../conf/zoo.cfgStopping zookeeper... STOPPED

2.2 zoo.cfg configuration

TickTime: the unit of time used for computing, such as session timeout: N* tickTime ·initLimit: for clusters, the initial connection time that allows slave nodes to connect and synchronize to master nodes, expressed in multiples of tickTime: syncLimit: for clusters, the length of request and reply time for sending messages between master master and slave nodes. (heartbeat mechanism) dataDir: dataLogDir: log directory must be configured. If not, it will share clientPort with dataDir: the port to connect to the server. Default is 2181.

2.3 Zookeeper main directory structure

Some of bin's main running commands, conf, store the configuration file, in which what needs to be modified is zk.cfg ·contrib: additional functions dist-maven: mvn compiled directory docs: documentation lib: jar package to rely on recipes: case demo code src: source code

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