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https://issues.apache.org/jira/browse/LUCENE-1313?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12715628#action_12715628
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Jason Rutherglen commented on LUCENE-1313:
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{quote}For IW.resolveRAMSegments, maybe we should make a single
merge that merges everything down? Why even bother interacting
with a merge policy, here?{quote}
LogMergePolicy.findMergesForOptimize I assumed would merge
segments to a single segment, in testing resolveRAMSegments that
doesn't always seem to be the case?
When I created a mergeAllSegments to one, the
ensureContiguousMerge would throw an exception. I thought about
avoiding ensureContiguousMerge but it required reworking a bunch
of code. Why does ensureContiguousMerge exist? Is it for
assertions or is there a reason segments need to be next to each
other when merging?
> 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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