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Posted to common-dev@hadoop.apache.org by "eric baldeschwieler (JIRA)" <ji...@apache.org> on 2006/05/03 02:10:47 UTC

[jira] Updated: (HADOOP-54) SequenceFile should compress blocks, not individual entries

     [ http://issues.apache.org/jira/browse/HADOOP-54?page=all ]

eric baldeschwieler updated HADOOP-54:
--------------------------------------

    Fix Version: 0.4
                     (was: 0.3)

> SequenceFile should compress blocks, not individual entries
> -----------------------------------------------------------
>
>          Key: HADOOP-54
>          URL: http://issues.apache.org/jira/browse/HADOOP-54
>      Project: Hadoop
>         Type: Improvement

>   Components: io
>     Versions: 0.2
>     Reporter: Doug Cutting
>     Assignee: Michel Tourn
>      Fix For: 0.4

>
> SequenceFile will optionally compress individual values.  But both compression and performance would be much better if sequences of keys and values are compressed together.  Sync marks should only be placed between blocks.  This will require some changes to MapFile too, so that all file positions stored there are the positions of blocks, not entries within blocks.  Probably this can be accomplished by adding a getBlockStartPosition() method to SequenceFile.Writer.

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