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From "Rohini Palaniswamy (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (PIG-5083) CombinerPackager and LitePackager should not materialize bags
Date Fri, 06 Jan 2017 21:46:59 GMT

     [ https://issues.apache.org/jira/browse/PIG-5083?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Rohini Palaniswamy updated PIG-5083:
------------------------------------
    Summary: CombinerPackager and LitePackager should not materialize bags  (was: CombinerPackager
uses twice the memory due to materializing of bags)

Found that https://github.com/apache/pig/blob/branch-0.12/src/org/apache/pig/backend/hadoop/executionengine/physicalLayer/relationalOperators/POPackageLite.java#L170-L180
also was not materializing bags earlier.

> CombinerPackager and LitePackager should not materialize bags
> -------------------------------------------------------------
>
>                 Key: PIG-5083
>                 URL: https://issues.apache.org/jira/browse/PIG-5083
>             Project: Pig
>          Issue Type: Bug
>            Reporter: Rohini Palaniswamy
>            Assignee: Rohini Palaniswamy
>             Fix For: 0.17.0
>
>
> Before PIG-3591 and creation of CombinerPackager, POCombinerPackage directly read from
the combiner/reducer input instead of materializing the bag.
> https://github.com/apache/pig/blob/branch-0.12/src/org/apache/pig/backend/hadoop/executionengine/physicalLayer/relationalOperators/POCombinerPackage.java#L140-L161
> The unnecessary materialization leads to lot of spills and OOMs in some cases.



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