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https://issues.apache.org/jira/browse/HIVE-9658?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14357601#comment-14357601
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Brock Noland commented on HIVE-9658:
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My patch to make pre-commits working on branches is nearly ready but for now
the patch must work on trunk...
> Reduce parquet memory use by bypassing java primitive objects on
> ETypeConverter
> -------------------------------------------------------------------------------
>
> Key: HIVE-9658
> URL: https://issues.apache.org/jira/browse/HIVE-9658
> Project: Hive
> Issue Type: Sub-task
> Reporter: Sergio Peña
> Assignee: Sergio Peña
> Attachments: HIVE-9658.1.patch, HIVE-9658.2.patch, HIVE-9658.3.patch
>
>
> The ETypeConverter class passes Writable objects to the collection converters
> in order to be read later by the map/reduce functions. These objects are all
> wrapped in a unique ArrayWritable object.
> We can save some memory by returning the java primitive objects instead in
> order to prevent memory allocation. The only writable object needed by
> map/reduce is ArrayWritable. If we create another writable class where to
> store primitive objects (Object), then we can stop using all primitive
> wirtables.
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