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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 Tue, 18 Nov 2008 14:27:44 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-4640.patch

Replaced the TreeSet with long[], fixed the incorrect checksum count, fixed the indexer loop
termination.
As for the close() I did as suggested, although it rubs me the wrong way to read all those
bytes without needing to. I guess the practical performance impact will be minimal though.

> 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
>
>
> 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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