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From "Prasanth J (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HIVE-7859) Tune zlib compression in ORC to account for the encoding strategy
Date Thu, 11 Sep 2014 18:18:36 GMT

     [ https://issues.apache.org/jira/browse/HIVE-7859?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Prasanth J updated HIVE-7859:
-----------------------------
       Resolution: Fixed
    Fix Version/s: 0.14.0
           Status: Resolved  (was: Patch Available)

Committed to trunk. Thanks [~gopalv] for the patch.

> Tune zlib compression in ORC to account for the encoding strategy
> -----------------------------------------------------------------
>
>                 Key: HIVE-7859
>                 URL: https://issues.apache.org/jira/browse/HIVE-7859
>             Project: Hive
>          Issue Type: Bug
>          Components: File Formats
>            Reporter: Gopal V
>            Assignee: Gopal V
>             Fix For: 0.14.0
>
>         Attachments: HIVE-7859.1.patch, HIVE-7859.2.patch, HIVE-7859.3.patch
>
>
> Currently ORC Zlib is slow because several compression strategies ZLib uses is already
done by ORC in itself (dictionary, RLE, bit-packing).
> We need to pick between Z_FILTERED, Z_HUFFMAN_ONLY, Z_RLE, Z_FIXED and Z_DEFAULT_STRATEGY
according to column stream type.
> For instance an RLE_V2 stream could a use Z_FILTERED compression without invoking the
rest of the strategies.
> The string streams can use Z_FIXED compression strategies and so on.
> The core limitation to stick to retain compatibility with the default decompressor, so
that these are automatically backward compatible.



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