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From "Cheolsoo Park (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (PIG-4001) POPartialAgg aggregates too aggressively when multiple values aggregated
Date Wed, 18 Jun 2014 19:40:26 GMT

    [ https://issues.apache.org/jira/browse/PIG-4001?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14036254#comment-14036254
] 

Cheolsoo Park commented on PIG-4001:
------------------------------------

+1. Will commit this later today.

> POPartialAgg aggregates too aggressively when multiple values aggregated
> ------------------------------------------------------------------------
>
>                 Key: PIG-4001
>                 URL: https://issues.apache.org/jira/browse/PIG-4001
>             Project: Pig
>          Issue Type: Bug
>    Affects Versions: 0.13.0
>            Reporter: Travis Woodruff
>            Assignee: Travis Woodruff
>            Priority: Minor
>         Attachments: PIG-4001.patch
>
>
> {{POPartialAgg.aggregateRawRow()}} is counting values in {{numEntriesInTarget}}, but
all the values that {{numEntriesInTarget}} is compared to count tuples.
> This is similar to PIG-3649 but has less of a performance impact, as it generally does
not cause map-side aggregation to be disabled entirely (since {{aggregateRawRow()}} is unlikely
to be called before {{checkSizeReduction()}}; however, it can cause second-level aggregation
to be run too often.



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