Fix the 'cluster drain' problem in the Capacity Scheduler wrt High RAM Jobs
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Key: HADOOP-5964
URL: https://issues.apache.org/jira/browse/HADOOP-5964
Project: Hadoop Core
Issue Type: Bug
Components: contrib/capacity-sched
Affects Versions: 0.20.0
Reporter: Arun C Murthy
Fix For: 0.21.0
When a HighRAMJob turns up at the head of the queue, the current implementation
of support for HighRAMJobs in the Capacity Scheduler has problem in that the
scheduler stops assigning tasks to all TaskTrackers in the cluster until a
HighRAMJob finds a suitable TaskTrackers for all its tasks.
This causes a severe utilization problem since effectively no new tasks are
allowed to run until the HighRAMJob (at the head of the queue) gets slots.
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