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From "Ankit Modi (JIRA)" <j...@apache.org>
Subject [jira] Updated: (PIG-960) Using Hadoop's optimized LineRecordReader for reading Tuples in PigStorage
Date Tue, 15 Sep 2009 01:25:57 GMT

     [ https://issues.apache.org/jira/browse/PIG-960?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Ankit Modi updated PIG-960:
---------------------------

    Patch Info:   (was: [Patch Available])

Performance improvement numbers obtained by running PigMix

||Script||svn Trunk||LineRecordReader Patch||
||L1|186|147|
||L2|73|33|
||L3|195|165|
||L4|116|76|
||L5|93|59|
||L6|102|63|
||L7|91|69|
||L8|84|44|
||L9|189|148|
||L10|285|268|
||L11|108|51|
||L12|112|73|
||Sum|1634|1196|
||% Improvement| ||26.81|



> Using Hadoop's optimized LineRecordReader for reading Tuples in PigStorage 
> ---------------------------------------------------------------------------
>
>                 Key: PIG-960
>                 URL: https://issues.apache.org/jira/browse/PIG-960
>             Project: Pig
>          Issue Type: Improvement
>          Components: impl
>            Reporter: Ankit Modi
>
> PigStorage's reading of Tuples ( lines ) can be optimized using Hadoop's {{LineRecordReader}}.
> This can help in following areas
> - Improving performance reading of Tuples (lines) in {{PigStorage}}
> - Any future improvements in line reading done in Hadoop's {{LineRecordReader}} is automatically
carried over to Pig
> Issues that are handled by this patch
> - BZip uses internal buffers and positioning for determining the number of bytes read.
Hence buffering done by {{LineRecordReader}} has to be turned off
> - Current implementation of {{LocalSeekableInputStream}} does not implement {{available}}
method. This method has to be implemented.

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