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Vinod Kumar Vavilapalli commented on YARN-2171: ----------------------------------------------- The code changes look fine enough to me. The test is not so useful beyond validating this ticket, but that's okay. I see that we don't have any test validating the number of nodes itself explicitly, shall we add that here? > AMs block on the CapacityScheduler lock during allocate() > --------------------------------------------------------- > > Key: YARN-2171 > URL: https://issues.apache.org/jira/browse/YARN-2171 > Project: Hadoop YARN > Issue Type: Bug > Components: capacityscheduler > Affects Versions: 0.23.10, 2.4.0 > Reporter: Jason Lowe > Assignee: Jason Lowe > Priority: Critical > Attachments: YARN-2171.patch > > > When AMs heartbeat into the RM via the allocate() call they are blocking on > the CapacityScheduler lock when trying to get the number of nodes in the > cluster via getNumClusterNodes. -- This message was sent by Atlassian JIRA (v6.2#6252)