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https://issues.apache.org/jira/browse/PIG-3044?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Dmitriy V. Ryaboy resolved PIG-3044.
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Resolution: Fixed
Fix Version/s: 0.11
Release Note: When pig.exec.mapPartAgg, previously the memory reserved for
in-memory aggregation was roughly 1/3 the value of pig.cachedbag.memusage per
POPartialAgg operator. Reserving that much RAM could cause problems for jobs
that required a lot of memory. POPartialAgg is now spillable, and regardless of
the setting of pig.cachedbag.memusage, will happily shrink when memory is
needed.
> 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: 0.11, 0.12
>
> Attachments: PIG-3044.2.diff, PIG-3404.diff
>
>
> 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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