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From "Johan Oskarsson (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HADOOP-4640) Add ability to split text files compressed with lzo
Date Wed, 12 Nov 2008 17:21:44 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-4640?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Johan Oskarsson updated HADOOP-4640:
------------------------------------

    Attachment: HADOOP-4622.patch

First version of the lzo splittable input format. Please review.

I decided to write a unit test that doesn't require the lzo native libs to be loaded, it's
not ideal but it works.
The other option would be to write one that needs the native libs and otherwise doesn't run
the test. What is our policy on this?

There will probably be one findbugs error, the same one exists in the LineRecordReader I based
this off, I don't think it will cause any harm.

> 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
>         Attachments: HADOOP-4622.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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