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https://issues.apache.org/jira/browse/LUCENE-2809?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12970308#action_12970308
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Michael McCandless commented on LUCENE-2809:
--------------------------------------------
Committed to 4.0, 3.x... I'll leave this open to remind us to backport if we
ever do another 2.9.x/3.0.x release.
> IndexWriter.numDocs doesn't take into account applied but not flushed deletes
> -----------------------------------------------------------------------------
>
> Key: LUCENE-2809
> URL: https://issues.apache.org/jira/browse/LUCENE-2809
> Project: Lucene - Java
> Issue Type: Bug
> Components: Index
> Reporter: Michael McCandless
> Assignee: Michael McCandless
> Priority: Minor
> Fix For: 2.9.5, 3.0.4, 3.1, 4.0
>
>
> The javadoc states that buffered deletes are not taken into account and so
> you must call commit first.
> But, if you do that, and you're using CMS, and you're unlucky enough to have
> a background merge commit just after you call commit but before you call
> .numDocs, you can still get a wrong count back.
> The fix is trivial -- numDocs should also consult any pooled readers for
> their current del count.
> This is causing an intermittent failure in the new TestNRTThreads.
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