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https://issues.apache.org/jira/browse/MAPREDUCE-6721?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15345457#comment-15345457
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Tsuyoshi Ozawa commented on MAPREDUCE-6721:
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[~jira.shegalov] +1. It's a straight-forward extension of the configuration.
Checking this in into trunk and branch-2.
> 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: Improvement
> Components: mrv2, task
> Affects Versions: 2.6.4
> Reporter: Gera Shegalov
> Assignee: Gera Shegalov
> Attachments: MAPREDUCE-6721.001.patch, MAPREDUCE-6721.002.patch
>
>
> 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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