Jason Lowe created MAPREDUCE-5002:
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Summary: AM could potentially allocate a reduce container to a map
attempt
Key: MAPREDUCE-5002
URL: https://issues.apache.org/jira/browse/MAPREDUCE-5002
Project: Hadoop Map/Reduce
Issue Type: Bug
Components: mr-am
Affects Versions: 2.0.3-alpha, 0.23.7
Reporter: Jason Lowe
As discussed in MAPREDUCE-4982, after MAPREDUCE-4893 it is theoretically
possible for the AM to accidentally assign a reducer container to a map attempt
if the AM doesn't find a reduce attempt actively looking for the container
(e.g.: the RM accidentally allocated too many reducer containers).
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