Zookeeper ~ Deployment in Linux, zookeeperlinux

Zookeeper ~ Deployment in Linux, zookeeperlinux
Introduction

ZooKeeper is a distributed, open-source distributed application Coordination Service. It is an open-source implementation of Google's Chubby and an important component of Hadoop and Hbase. It is a software that provides consistency services for distributed applications. It provides functions such as configuration maintenance, Domain Name Service, distributed synchronization, and group service.
The goal of ZooKeeper is to encapsulate key services that are complex and error-prone, and provide users with easy-to-use interfaces and systems with high performance and stable functions.
ZooKeeper contains a simple primitive set that provides Java and C interfaces.
ZooKeeper code version provides distributed exclusive lock, election, queue interface, code in the zookeeper-3.4.3 \ src \ recipes. The distribution locks and queues have Java and C versions, and only Java versions are selected.

 
 

  
  

    Foreign Name 
  
  
  

    ZooKeeper 
  
  
  

    Class 
  
  
  

    Reliable coordination system for Distributed Systems 
  
 
 
 
 

  
  

    Subordinate 
  
  
  
 
   Official subproject of Hadoop 
  
  
  

    Special Points 
  
  
  

    Efficient and reliable 
  
 
 

Principle

ZooKeeper is based on the Fast Paxos algorithm. The Paxos algorithm has a live lock problem. That is, when multiple proposer are submitted in a staggered manner, they may be mutually exclusive. As a result, no proposer can be submitted successfully, fast Paxos has made some optimizations. By selecting a leader, only the leader can submit the proposer. The specific algorithm can be seen in Fast Paxos. Therefore, to understand ZooKeeper, you must first understand Fast Paxos.
The basic operation process of ZooKeeper:
1. Select the Leader.
2. synchronize data.
3. There are many algorithms in the election Leader process, but the election standards to be met are consistent.
4. The Leader must have the highest execution ID, similar to the root permission.
5. Most machines in the cluster receive the response and select the Leader as follow.

Zookeeper is a coordinator.

Installation and deployment on Linux-centos

Download from the official website:

Http://zookeeper.apache.org/

Decompress:

Tar-xzvf zookeeper-3.5.2-alpha.tar.gz

Install JDK:

Yum install java-1.7.0-openjdk-src.x86_64

Configuration directory JAVA_HOME:

Vi/etc/profile. After opening the file, append the following content.

Export JAVA_HOME =/usr/lib/jvm/java-1.7.0-openjdk-1.7.0.9
Export CLASSPATH =.: $ JAVA_HOME/jre/lib/rt. jar: $ JAVA_HOME/lib/dt. jar: $ JAVA_HOME/lib/tools. jar
Export PATH = $ PATH: $ JAVA_HOME/bin

Run the zookeeper service:

Bin/zkServer. sh start conf/zoo. cfg

Result

 

Thank you for your support and technology. We will continue!