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https://issues.apache.org/jira/browse/PIG-3044?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13494382#comment-13494382
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Dmitriy V. Ryaboy commented on PIG-3044:
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Since this is preventing some jobs from migrating from Pig 9 to Pig 11 in our
environment, I would like to add it to 11, but an argument can be made that
this is not a critical bug and should therefore not be applied to the 0.11
branch. Committers, please weigh in if you have an opinion on this.
> Trigger POPartialAgg compaction under GC pressure
> -------------------------------------------------
>
> Key: PIG-3044
> URL: https://issues.apache.org/jira/browse/PIG-3044
> Project: Pig
> Issue Type: Improvement
> Affects Versions: 0.10.0, 0.11, 0.10.1
> Reporter: Dmitriy V. Ryaboy
> Assignee: Dmitriy V. Ryaboy
> Fix For: 0.12
>
>
> If partial aggregation is turned on in pig 10 and 11, 20% (by default) of the
> available heap can be consumed by the POPartialAgg operator. This can cause
> memory issues for jobs that use all, or nearly all, of the heap already.
> If we make POPartialAgg "spillable" (trigger compaction when memory reduction
> is required), we would be much nicer to high-memory jobs.
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