Jason Lowe created YARN-4047:
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Summary: ClientRMService getApplications has high scheduler lock
contention
Key: YARN-4047
URL: https://issues.apache.org/jira/browse/YARN-4047
Project: Hadoop YARN
Issue Type: Bug
Components: resourcemanager
Reporter: Jason Lowe
The getApplications call can be particuarly expensive because the code can call
checkAccess on every application being tracked by the RM. checkAccess will
often call scheduler.checkAccess which will grab the big scheduler lock. This
can cause a lot of contention with the scheduler thread which is busy trying to
process node heartbeats, app allocation requests, etc.
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