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https://issues.apache.org/jira/browse/LUCENE-1313?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12714491#action_12714491
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Jason Rutherglen commented on LUCENE-1313:
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I had forgotten about concurrency with the docstores (keeping an
open IndexInput and IndexOutput) when using an FSDirectory. I
wrote a test (which fails) so getting this functionality to work
could require some reworking of FSDirectory internals?
(Something on the order of auto updating IndexInput's buffers
and file length as IndexOutput is flushed?)
We need simultaneous IndexInput and IndexOutput ops to work as
docstore is streamed to FSDir for multiple segments. After a
segment is flushed to the ramdir it can be read from, including
the docstore which is still actively being written to (for the
new segments)?
> 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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