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https://issues.apache.org/jira/browse/LUCENE-8799?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16839994#comment-16839994
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Atri Sharma commented on LUCENE-8799:
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[~jpountz] The primary difference is not flushing in memory segments to disk.
The idea is to have a method which just fsyncs what is already flushed and
allows IndexReaders to see the changes. This can be useful for controlling the
visibility of segments in fine grained tests i.e. a test might want some
specific data to be visible, but may have some other document in flight that
should not yet surface in searches.
> Add Force Commit Method to RandomIndexWriter
> --------------------------------------------
>
> Key: LUCENE-8799
> URL: https://issues.apache.org/jira/browse/LUCENE-8799
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Atri Sharma
> Priority: Minor
> Attachments: LUCENE-8799.patch
>
>
> A test convenience would be to add a force commit method in
> RandomIndexWriter. This will allow writing tests where segment sizes can be
> accurately controlled.
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