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From "Michael McCandless (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-1618) Allow setting the IndexWriter docstore to be a different directory
Date Tue, 28 Apr 2009 15:41:30 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-1618?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12703683#action_12703683
] 

Michael McCandless commented on LUCENE-1618:
--------------------------------------------

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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