mr job stuck because reducers using all slots and mapper isn't scheduled
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Key: MAPREDUCE-3126
URL: https://issues.apache.org/jira/browse/MAPREDUCE-3126
Project: Hadoop Map/Reduce
Issue Type: Bug
Components: mrv2
Affects Versions: 0.23.0
Reporter: Thomas Graves
Priority: Blocker
Fix For: 0.23.0
The command in MAPREDUCE-3124 run and this job got hung with 1 Map task waiting
for resources and 7 Reducers running (2 waiting). The mapper got scheduler,
then AM scheduled the reducers, the map task failed and tried to start a new
attempt but reducers were using all the slots.
I will try to add some more info from the logs.
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