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From "Prasanth Jayachandran (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HIVE-12450) OrcFileMergeOperator does not use correct compression buffer size
Date Wed, 18 Nov 2015 03:00:15 GMT

     [ https://issues.apache.org/jira/browse/HIVE-12450?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Prasanth Jayachandran updated HIVE-12450:
-----------------------------------------
    Component/s: ORC

> OrcFileMergeOperator does not use correct compression buffer size
> -----------------------------------------------------------------
>
>                 Key: HIVE-12450
>                 URL: https://issues.apache.org/jira/browse/HIVE-12450
>             Project: Hive
>          Issue Type: Bug
>          Components: ORC
>    Affects Versions: 1.2.0, 1.3.0, 1.2.1, 2.0.0
>            Reporter: Prasanth Jayachandran
>            Assignee: Prasanth Jayachandran
>         Attachments: HIVE-12450.1.patch
>
>
> OrcFileMergeOperator checks for compatibility before merging orc files. This compatibility
check include checking compression buffer size. But the output file that is created does not
honor the compression buffer size and always defaults to 256KB. This will not be a problem
when reading the orc file but can create unwanted memory pressure because of wasted space
within compression buffer.



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