[YARN-2171] AMs block on the CapacityScheduler lock during allocate()

• Type: Bug
• Status: Closed
• Priority: Critical
• Resolution: Fixed
• Affects Version/s: 0.23.10, 2.4.0
• Fix Version/s: 2.5.0
• Component/s: capacityscheduler
• Target Version/s: 2.5.0
• Hadoop Flags: Reviewed
• Assignee: Jason Darrell Lowe
• Reporter: Jason Darrell Lowe
• Created: 17/Jun/14 14:39
• Updated: 15/Aug/14 05:44
• Resolved: 25/Jun/14 21:57

Description

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.