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From "Daniel Dai (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (PIG-2610) GC errors on using FILTER within nested FOREACH
Date Mon, 26 Mar 2012 08:34:27 GMT

    [ https://issues.apache.org/jira/browse/PIG-2610?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13238205#comment-13238205
] 

Daniel Dai commented on PIG-2610:
---------------------------------

Yes, we shall open a Jira for the new rule. For now, you can try to manually optimize the
script by moving filter before group and project necessary columns before group. The GC exception
is not from bag but from POProject, my suspicion is hadoop shuffle/sorting use too much memory
and there is no memory for Pig to turn around.
                
> GC errors on using FILTER within nested FOREACH
> -----------------------------------------------
>
>                 Key: PIG-2610
>                 URL: https://issues.apache.org/jira/browse/PIG-2610
>             Project: Pig
>          Issue Type: Bug
>    Affects Versions: 0.9.1
>            Reporter: Prashant Kommireddi
>
> User has reported running into GC overhead errors while trying to use FILTER within FOREACH
and aggregating the filtered field. Here is the sample PigLatin script provided by the user
that generated this issue. 
> {code}
> raw = LOAD 'input' using MyCustomLoader();
> searches = FOREACH raw GENERATE
>                day, searchType,
>                FLATTEN(impBag) AS (adType, clickCount)
>            ;
> groupedSearches = GROUP searches BY (day, searchType) PARALLEL 50;
> counts = FOREACH groupedSearches{
>                type1 = FILTER searches BY adType == 'type1';
>                type2 = FILTER searches BY adType == 'type2';
>                GENERATE
>                    FLATTEN(group) AS (day, searchType),
>                    COUNT(searches) numSearches,
>                    SUM(clickCount) AS clickCountPerSearchType,
>                    SUM(type1.clickCount) AS type1ClickCount,
>                    SUM(type2.clickCount) AS type2ClickCount;
>        };
> {code}
> Pig should be able to handle this case.

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