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From "Prasanth J (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-7250) Adaptive compression buffer size for wide tables in ORC
Date Thu, 19 Jun 2014 01:06:24 GMT

    [ https://issues.apache.org/jira/browse/HIVE-7250?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14036773#comment-14036773
] 

Prasanth J commented on HIVE-7250:
----------------------------------

The qfile test was added just to make sure the wide table creation runs with any OOM with
the default heap settings. I will add a unit test in the next patch that will check for buffer
sizes.

> Adaptive compression buffer size for wide tables in ORC
> -------------------------------------------------------
>
>                 Key: HIVE-7250
>                 URL: https://issues.apache.org/jira/browse/HIVE-7250
>             Project: Hive
>          Issue Type: Improvement
>          Components: File Formats
>    Affects Versions: 0.14.0
>            Reporter: Prasanth J
>            Assignee: Prasanth J
>              Labels: orcfile
>         Attachments: HIVE-7250.1.patch, HIVE-7250.2.patch, HIVE-7250.3.patch
>
>
> If the input table is wide (in the order of 1000s), ORC compression buffer size overhead
becomes significant causing OOM issues. To overcome this issue, buffer size should be adaptively
chosen based on the available memory and the number of columns.



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