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https://issues.apache.org/jira/browse/LUCENE-1618?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12703656#action_12703656
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Earwin Burrfoot commented on LUCENE-1618:
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bq. You mean an opened IndexOutput would write its output to two (or more)
different places?
Except the best way is to write directly to FSDir.IndexOutput, and when it is
closed, read back into memory.
That way, if FSDir.IO hits an exception while writing, you don't have to jump
through the hoops to keep your RAMDir in consistent state (we had real troubles
when some files were 'written' to RAMDir, but failed to persist in FSDir).
Also, when reading the file back you already know it's exact size and can
allocate appropriate buffer, saving on resizings (my draft impl) / chunking
(lucene's current impl) overhead.
> 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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