Corner case in headroom calculation
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Key: MAPREDUCE-3631
URL: https://issues.apache.org/jira/browse/MAPREDUCE-3631
Project: Hadoop Map/Reduce
Issue Type: Task
Components: mrv2
Affects Versions: 0.23.0
Reporter: Amol Kekre
Fix For: 0.23.1
When there is a single queue and a large job fills up the whole cluster, a lost
NM can lead to wrong headroom when all
slots are taken up by reduces since at that point headroom isn't recomputed.
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