Extend Codec with a SegmentInfos writer / reader
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                 Key: LUCENE-2491
                 URL: https://issues.apache.org/jira/browse/LUCENE-2491
             Project: Lucene - Java
          Issue Type: Improvement
          Components: Index
    Affects Versions: 4.0
            Reporter: Andrzej Bialecki 


I'm trying to implement a Codec that works with append-only filesystems (HDFS). 
It's _almost_ done, except for the SegmentInfos.write(dir), which uses 
ChecksumIndexOutput, which in turn uses IndexOutput.seek() - and seek is not 
supported on append-only output. I propose to extend the Codec interface to 
encapsulate also the details of SegmentInfos writing / reading. Patch to follow 
after some feedback ;)

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