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https://issues.apache.org/jira/browse/LUCENE-1618?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12703415#action_12703415
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Michael McCandless commented on LUCENE-1618:
--------------------------------------------

bq. Would also further suggest that this Directory implementation would take 
one or more directories to store documents, along with one or more directories 
to store the index itself

You mean an opened IndexOutput would write its output to two (or more) 
different places?  So you could "write through" a RAMDir down to an FSDir?  
(This way both the RAMDir and FSDir have a copy of the index).

> Allow setting the IndexWriter docstore to be a different directory
> ------------------------------------------------------------------
>
>                 Key: LUCENE-1618
>                 URL: https://issues.apache.org/jira/browse/LUCENE-1618
>             Project: Lucene - Java
>          Issue Type: Improvement
>          Components: Index
>    Affects Versions: 2.4.1
>            Reporter: Jason Rutherglen
>            Priority: Minor
>             Fix For: 2.9
>
>   Original Estimate: 336h
>  Remaining Estimate: 336h
>
> Add an IndexWriter.setDocStoreDirectory method that allows doc
> stores to be placed in a different directory than the IW default
> dir.

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