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https://issues.apache.org/jira/browse/LUCENE-8068?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16271084#comment-16271084
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Michael McCandless commented on LUCENE-8068:
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+1, new patch looks great, except still has "non" typo :)
> Allow IndexWriter to write a single DWPT to disk
> ------------------------------------------------
>
> Key: LUCENE-8068
> URL: https://issues.apache.org/jira/browse/LUCENE-8068
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Simon Willnauer
> Fix For: master (8.0), 7.2
>
> Attachments: LUCENE-8068.patch, LUCENE-8068.patch, LUCENE-8068.patch
>
>
> Today we IW can only flush a DWPT to disk if an external resource calls
> flush() or refreshes a NRT reader or if a DWPT is selected as flush pending.
> Yet, the latter has the problem that it always ties up an indexing thread and
> if flush / NRT refresh is called a whole bunch of indexing threads is tied
> up. If IW could offer a simple `flushNextBuffer()` method that synchronously
> flushes the next pending or biggest active buffer to disk memory could be
> controlled in a more fine granular fashion from outside of the IW. This is
> for instance useful if more than one IW (shards) must be maintained in a
> single JVM / system.
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