Zookeeper configurations

Let's assume you have installed Zookeeper on all three Zookeeper nodes; now we will walk you through the configurations so that you have a better understanding of them.

An excerpt from zoo.cfg, in our case, is located at <zookeeper_installation_dir>/ zookeeper-3.4.5/conf/. The Zookeeper configurations are as follows:

• dataDir=/usr/local/zookeeper/tmp: This is the path where Zookeeper stores its snapshots; these snapshots are actually the state log where the current cluster state is maintained for the purpose of coordination. In the event of a failure, these snapshots are used to restore the cluster to the last stable state. This directory also contains a file containing a single entry called myID. This value starts from 1 and is different for each Zookeeper node, so we will keep it as follows:

  zkp-1.mydomain.net – value of myId =1
  zkp-2.mydomain.net – value of myId =2
  zkp-3.mydomain.net – value of myId =3

  Whenever you want to start from scratch, or when you upscale...