[ http://issues.apache.org/jira/browse/HADOOP-54?page=all ]
Doug Cutting updated HADOOP-54:
-------------------------------
Status: Resolved (was: Patch Available)
Resolution: Fixed
I just committed this.
Owen, when you converted things to use the Java 1.5 enum you also threw out
most of the javadoc on that class. I restored & improved this before I
committed.
> SequenceFile should compress blocks, not individual entries
> -----------------------------------------------------------
>
> Key: HADOOP-54
> URL: http://issues.apache.org/jira/browse/HADOOP-54
> Project: Hadoop
> Issue Type: Improvement
> Components: io
> Affects Versions: 0.2.0
> Reporter: Doug Cutting
> Assigned To: Arun C Murthy
> Fix For: 0.6.0
>
> Attachments: enum-54.patch, SequenceFile.20060821.patch,
> SequenceFile.20060821.perfomance.txt, SequenceFile.20060822.tgz,
> SequenceFile.updated.final.patch, SequenceFile20060824.tgz,
> SequenceFiles.final.patch, SequenceFiles.patch, SequenceFilesII.patch,
> VIntCompressionResults.txt
>
>
> 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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