Jason Lowe created YARN-2171:
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Summary: 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: 2.4.0, 0.23.10
Reporter: Jason Lowe
Assignee: Jason Lowe
Priority: Critical
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.
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