Race condition in MR App Master Preemtion can cause a dead lock
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Key: MAPREDUCE-3274
URL: https://issues.apache.org/jira/browse/MAPREDUCE-3274
Project: Hadoop Map/Reduce
Issue Type: Bug
Components: mrv2, scheduler
Affects Versions: 0.23.0, 0.24.0
Reporter: Robert Joseph Evans
Assignee: Robert Joseph Evans
Priority: Critical
Fix For: 0.23.0, 0.24.0
There appears to be a race condition in the MR App Master in relation to
preempting reducers to let a mapper run. In the particular case that I have
been debugging a reducer was selected for preemption that did not have a
container assigned to it yet. When the container became available that reduce
started running and the previous TA_KILL event appears to have been ignored.
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