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https://issues.apache.org/jira/browse/LUCENE-5079?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13694103#comment-13694103
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Uwe Schindler commented on LUCENE-5079:
---------------------------------------

Alternatively you can make the whole method synchronized. sync(this) is just 
more explicit and goes in line with the other uses of lastCommitChangeCount
                
> allow IndexWriter user to tell if there are uncommitted changes.
> ----------------------------------------------------------------
>
>                 Key: LUCENE-5079
>                 URL: https://issues.apache.org/jira/browse/LUCENE-5079
>             Project: Lucene - Core
>          Issue Type: Improvement
>            Reporter: Yonik Seeley
>         Attachments: LUCENE-5079.patch
>
>
> IndexWriter already currently tracks if there are uncommitted changes.  We 
> should expose this somehow... perhaps a boolean hasUncommittedChanges()?

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