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https://issues.apache.org/jira/browse/LUCENE-1313?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12714522#action_12714522
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Jason Rutherglen commented on LUCENE-1313:
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I guess I'm confused about the doc stores. We keep one open on
disk for multiple segments being created in the via FSD, which
means the IndexOutput isn't closed, however for each new
SegmentReader that's opened, we're creating a new IndexInput
only after the segment is flushed (to FSD, docstore to disk).
So the concurrent docstores may work without too much changing
of FSDir internals, as the portion of the docstore file that the
SR needs to know about has been flushed to disk when SR is
opened. The SR should then be able to open the docstore file
cleanly regardless of the open IndexOutput adding more to the
file for the next rambuf segment?
> Realtime Search
> ---------------
>
> Key: LUCENE-1313
> URL: https://issues.apache.org/jira/browse/LUCENE-1313
> Project: Lucene - Java
> Issue Type: New Feature
> Components: Index
> Affects Versions: 2.4.1
> Reporter: Jason Rutherglen
> Priority: Minor
> Fix For: 2.9
>
> Attachments: LUCENE-1313.jar, LUCENE-1313.patch, LUCENE-1313.patch,
> LUCENE-1313.patch, LUCENE-1313.patch, LUCENE-1313.patch, LUCENE-1313.patch,
> LUCENE-1313.patch, LUCENE-1313.patch, LUCENE-1313.patch, LUCENE-1313.patch,
> LUCENE-1313.patch, lucene-1313.patch, lucene-1313.patch, lucene-1313.patch,
> lucene-1313.patch
>
>
> Enable near realtime search in Lucene without external
> dependencies. When RAM NRT is enabled, the implementation adds a
> RAMDirectory to IndexWriter. Flushes go to the ramdir unless
> there is no available space. Merges are completed in the ram
> dir until there is no more available ram.
> IW.optimize and IW.commit flush the ramdir to the primary
> directory, all other operations try to keep segments in ram
> until there is no more space.
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