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https://issues.apache.org/jira/browse/LUCENE-1618?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12703370#action_12703370
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Michael McCandless commented on LUCENE-1618:
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Yeah I also think this should be an "under the hood" (done only by NRT)
optimization inside IndexWriter.
The only possible non-NRT case I can think of is when users make temporary
indices in RAM, it's possible one would want to write the docStore files to an
FSDirectory (because they are so large) but keep postings, norms, deletes, etc
in RAM. But going down that road opens up a can of worms... eg does segments_N
somehow have to keep track of which dir has which parts of a segment? Suddenly
IndexReader must also know to look in different dirs for different parts of a
segment, etc.
it might be cleaner to make a Directory impl that dispatches certain files to a
RAMDir and others to an FSDir, so IndexWriter/IndexReader still see a single
Directory API.
> 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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