[jira] [Reopened] (HIVE-9658) Reduce parquet memory usage by bypassing java primitive objects on ETypeConverter

["Sergio Peña (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HIVE-9658?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Sergio Peña reopened HIVE-9658:
-------------------------------

Reopening this issue to attach patch that will be committed to master.

> Reduce parquet memory usage 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, HIVE-9658.4.patch, HIVE-9658.5.patch
>
>
> NO PRECOMMIT TESTS
> 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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