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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