Jason Lowe created YARN-3136:

             Summary: getTransferredContainers can be a bottleneck during AM 
                 Key: YARN-3136
                 URL: https://issues.apache.org/jira/browse/YARN-3136
             Project: Hadoop YARN
          Issue Type: Bug
          Components: scheduler
    Affects Versions: 2.6.0
            Reporter: Jason Lowe

While examining RM stack traces on a busy cluster I noticed a pattern of AMs 
stuck waiting for the scheduler lock trying to call getTransferredContainers.  
The scheduler lock is highly contended, especially on a large cluster with many 
nodes heartbeating, and it would be nice if we could find a way to eliminate 
the need to grab this lock during this call.  We've already done similar work 
during AM allocate calls to make sure they don't needlessly grab the scheduler 
lock, and it would be good to do so here as well, if possible.

This message was sent by Atlassian JIRA

Reply via email to