[ https://issues.apache.org/jira/browse/YARN-4047?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Vinod Kumar Vavilapalli closed YARN-4047. ----------------------------------------- > 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 > Assignee: Jason Lowe > Labels: 2.6.1-candidate > Fix For: 2.6.1, 2.7.2 > > Attachments: YARN-4047.001.patch > > > 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. -- This message was sent by Atlassian JIRA (v6.3.4#6332)