Cloudera Docs

Apache Hadoop YARN default value changes

A list of default value changes when upgrading from CDH to CDP.

  • Scheduler: In CDP, Capacity Scheduler is the supported and default scheduler. For more information about scheduler migration and post-upgrade fine tuning, see Manual configuration of scheduler properties.
  • YARN and MapReduce daemons: YARN daemons (ResourceManager, NodeManager) and the JobHistory Server runs with unix group hadoop instead of yarn:yarn and mapred:mapred.
  • Cross-Origin Resource Sharing: CORS is enabled for every role by default.
  • YARN admin commands: By default YARN admin commands can be run only as yarn. In Cloudera Private Cloud Base 7.1.7 and higher a placeholder value ${yarn_user} is also supported. In such cases Cloudera Manager replace the placeholder value with the collected principal name.
  • ResourceManager recovery: ResourceManager recovery is enabled by default.
  • Filter entity list by use (filter-entity-list-by-user): Enabled by default, meaning that users can see only those applications on the UI which they have access to.
  • Log aggregation: IFile is the default file controller.
  • MapReduce shuffle connection keep-alive (mapreduce.shuffle.connection-keep-alive.enabled):: Set to true by default because Auto TLS requires it.
  • YARN Admin ACL: If the yarn.admin.acl property is not configured before the upgrade, its default value is changed from * to yarn. In Cloudera Private Cloud Base 7.1.7 and higher a placeholder value ${yarn_user} is also supported. In such cases Cloudera Manager replace the placeholder value with the collected principal name.