[jira] [Resolved] (PIG-3044) Trigger POPartialAgg compaction under GC pressure

["Dmitriy V. Ryaboy (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/PIG-3044?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Dmitriy V. Ryaboy resolved PIG-3044.
------------------------------------

       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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