[jira] [Created] (MAPREDUCE-6721) mapreduce.reduce.shuffle.memory.limit.percent=0.0 should be legal to enforce shuffle to disk

["Gera Shegalov (JIRA)" <ji...@apache.org>]

Gera Shegalov created MAPREDUCE-6721:
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             Summary: mapreduce.reduce.shuffle.memory.limit.percent=0.0 should be legal to enforce shuffle to disk
                 Key: MAPREDUCE-6721
                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-6721
             Project: Hadoop Map/Reduce
          Issue Type: Bug
          Components: mrv2, task
    Affects Versions: 2.6.4
            Reporter: Gera Shegalov
            Assignee: Gera Shegalov


We are potentially hitting an in-memory-shuffle-related reservation starvation resembling MAPREDUCE-6445. To work it around, we wanted to disable in memory shuffle via mapreduce.reduce.shuffle.memory.limit.percent=0.0 that turned out to be disallowed by the current logic. So we had to resort to another small float value such as 0.0001. However, zero is more logical imo.





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