Apache Hadoop YARN default value changes
A list of default value changes when upgrading from CDH to CDP.
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- 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 MapReduce daemon (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: YARN admin commands can be run only as
yarn
user by default. - ResourceManager recovery: ResourceManager recovery is enabled by default.
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.enabled
: Set totrue
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*
toyarn
.