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From "Chris Douglas (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-4640) Add ability to split text files compressed with lzo
Date Wed, 19 Nov 2008 22:10:44 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-4640?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12649179#action_12649179
] 

Chris Douglas commented on HADOOP-4640:
---------------------------------------

+1 Patch looks good.

You might want to try running test-patch and the unit tests on your machine; Hudson looks
backed up.

> Add ability to split text files compressed with lzo
> ---------------------------------------------------
>
>                 Key: HADOOP-4640
>                 URL: https://issues.apache.org/jira/browse/HADOOP-4640
>             Project: Hadoop Core
>          Issue Type: Improvement
>          Components: io, mapred
>            Reporter: Johan Oskarsson
>            Assignee: Johan Oskarsson
>            Priority: Trivial
>             Fix For: 0.20.0
>
>         Attachments: HADOOP-4640.patch, HADOOP-4640.patch, HADOOP-4640.patch, HADOOP-4640.patch
>
>
> Right now any file compressed with lzop will be processed by one mapper. This is a shame
since the lzo algorithm would be very suitable for large log files and similar common hadoop
data sets. The compression rate is not the best out there but the decompression speed is amazing.
 Since lzo writes compressed data in blocks it would be possible to make an input format that
can split the files.

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