Difference between ensemble and quorum in zookeeper

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Hi,

I am new to zookeeper, but I came across the terms ensemble and quorum in Zookeeper. Can anyone please let me know the difference in this?

May 24, 2019 in Big Data Hadoop by Nisha

edited May 24, 2019 by Gitika 297 views

1 answer to this question.

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Hey,

When you want to have high availability in zookeeper server you use multiple zookeeper servers to create an ensemble. Basically, Zookeeper has a master-slave architecture. In an ensemble, there will be one master and the rest will be the slaves. If the master fails one of the salves will act as a master.

The sequence in which a master is called a quorum. When you create an ensemble, zookeeper internally creates a sequence ID for the slave servers. When the main master fails, it will check the next sequence ID to create a new master. This concept of quorum also used while creating nodes in zookeeper. 

answered May 24, 2019 by Gitika
• 65,870 points

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