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https://issues.apache.org/jira/browse/LUCENE-2491?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12876203#action_12876203
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Earwin Burrfoot commented on LUCENE-2491:
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Or we can force the same Codec for the whole index. Which really makes sense.

> Extend Codec with a SegmentInfos writer / reader
> ------------------------------------------------
>
>                 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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