Getting Started with Cloudera Upgrade and MigrationPDF version

ZooKeeper

Understand the resource requirements for ZooKeeper before making the resource configuration changes in Cloudera Manager.

Component Java Heap CPU Disk
 ZooKeeper Server 
  • Minimum: 1 GB
  • Increase heap size when watching 10,000 - 100,000 ephemeral znodes and are using 1,000 or more clients.

Set this value using the Java Heap Size of ZooKeeper Server in Bytes ZooKeeper configuration property.

 Minimum: 4 cores

ZooKeeper was not designed to be a low-latency service and does not benefit from the use of SSD drives. The ZooKeeper access patterns – append-only writes and sequential reads – were designed with spinning disks in mind. Therefore Cloudera recommends using HDD drives.