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https://issues.apache.org/jira/browse/LUCENE-1618?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12703683#action_12703683
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Michael McCandless commented on LUCENE-1618:
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bq. by "diff" I meant the difference in search performance on a RAMDirectory vs
NIOFSDirectory where the files are all cached by the OS.
It's a good question -- I haven't tested it directly. I'd love to know too...
For an NRT writer using RAMDir for recently flushed tiny segments
(LUCENE-1313), the gains are more about the speed of reading/writing many tiny
files. Probably we should try [somehow] to test this case, to see if
LUCENE-1313 is even a worthwhile optimization.
> 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
>
> Attachments: MemoryCachedDirectory.java
>
> 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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