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https://issues.apache.org/jira/browse/LUCENE-6849?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14998665#comment-14998665
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ASF subversion and git services commented on LUCENE-6849:
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Commit 1713646 from [~mikemccand] in branch 'dev/trunk'
[ https://svn.apache.org/r1713646 ]
LUCENE-6849: expose IndexWriter.flush to move in-memory segments to disk
> Add IndexWriter API to write segment(s) without refreshing them
> ---------------------------------------------------------------
>
> Key: LUCENE-6849
> URL: https://issues.apache.org/jira/browse/LUCENE-6849
> Project: Lucene - Core
> Issue Type: New Feature
> Reporter: Michael McCandless
> Assignee: Michael McCandless
> Fix For: Trunk, 5.4
>
> Attachments: LUCENE-6849.patch
>
>
> Today, the only way to have {{IndexWriter}} free up some heap is to invoke
> refresh or flush or close it, but these are all quite costly, and do much
> more than simply "move bytes to disk".
> I think we should add a simple API, e.g. "move the biggest in-memory segment
> to disk" to 1) give more granularity (there could be multiple in-memory
> segments), and 2) only move bytes to disk (not refresh, not fsync, etc.).
> This way apps that want to be more careful on how heap is used can have more
> control.
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