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https://issues.apache.org/jira/browse/LUCENE-1313?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12714924#action_12714924
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Jason Rutherglen commented on LUCENE-1313:
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I want to run the Lucene unit tests in NRT mode without creating and/or
modifying all the test cases. In lieu of adding a
System.property that turns NRT on, have we settled on a
different mechanism for global settings? Perhaps the back compat
type of system can be used here? Or for now a static variable on
IW?
{quote}can we open a new IndexInput, while an IndexOutput is
still writing to the file?{quote}
I ran a test case successfully that writes to a file while
opening threads that read from flushed sections on windows.
Closing docstores for every flush would seem to cause a lot of
overhead. With NRT + FSD aren't termvector files merged on disk for
every segment?
{quote}We also should [separately] consider having multiple
SegmentReaders that share the same docStores{quote}
Doesn't FSDir open only one FD per file?
> 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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