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From "Brock Noland (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-9658) Reduce parquet memory use by bypassing java primitive objects on ETypeConverter
Date Wed, 11 Mar 2015 21:06:42 GMT

    [ https://issues.apache.org/jira/browse/HIVE-9658?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14357601#comment-14357601
] 

Brock Noland commented on HIVE-9658:
------------------------------------

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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