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From "Doug Cutting (JIRA)" <j...@apache.org>
Subject [jira] Created: (HADOOP-522) MapFile should support block compression
Date Mon, 11 Sep 2006 23:12:22 GMT
MapFile should support block compression
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                 Key: HADOOP-522
                 URL: http://issues.apache.org/jira/browse/HADOOP-522
             Project: Hadoop
          Issue Type: New Feature
          Components: io
            Reporter: 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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