[ http://issues.apache.org/jira/browse/HADOOP-54?page=all ]
Doug Cutting updated HADOOP-54:
-------------------------------
Fix Version: 0.5.0
(was: 0.4.0)
> 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: 0.2.0
> Reporter: Doug Cutting
> Assignee: Michel Tourn
> Fix For: 0.5.0
>
> 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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