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