[ http://issues.apache.org/jira/browse/HADOOP-522?page=all ]
Doug Cutting updated HADOOP-522:
--------------------------------
Attachment: (was: block-compress-map-file.patch)
> MapFile should support block compression
> ----------------------------------------
>
> Key: HADOOP-522
> URL: http://issues.apache.org/jira/browse/HADOOP-522
> Project: Hadoop
> Issue Type: New Feature
> Components: io
> Reporter: Doug Cutting
> Assigned To: Doug Cutting
>
> MapFile is layered on SequenceFile and permits random-access to sorted data
> files (typically reduce output) through a parallel index file. This is used
> widely in Nutch (e.g. at search time for displaying cached pages, incoming
> links, etc). Such sorted data should benefit from block compression, but the
> current MapFile API does not support specification of block compression.
> Also, even if it did, the semantics of SequenceFile methods like seek() and
> getPosition() are changed under block compression so that MapFile may not
> work.
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