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https://issues.apache.org/jira/browse/LUCENE-9453?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17175651#comment-17175651
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ASF subversion and git services commented on LUCENE-9453:
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Commit 092076ec39e0f71ae92d36cd4ebe69e21a97ce4e in lucene-solr's branch
refs/heads/master from Mike Drob
[ https://gitbox.apache.org/repos/asf?p=lucene-solr.git;h=092076e ]
LUCENE-9453 Assert lock held before volatile write (#1734)
Found via IntelliJ warnings.
> DocumentWriterFlushControl missing explicit sync on write
> ---------------------------------------------------------
>
> Key: LUCENE-9453
> URL: https://issues.apache.org/jira/browse/LUCENE-9453
> Project: Lucene - Core
> Issue Type: Bug
> Components: core/index
> Reporter: Mike Drob
> Priority: Trivial
> Time Spent: 0.5h
> Remaining Estimate: 0h
>
> checkoutAndBlock is not synchronized, but has a non-atomic write to
> {{numPending}}. Meanwhile, all of the other writes to numPending are in sync
> methods.
> In this case it turns out to be ok because all of the code paths calling this
> method are already sync:
> {{synchronized doAfterDocument -> checkout -> checkoutAndBlock}}
> {{checkoutLargestNonPendingWriter -> synchronized(this) -> checkout ->
> checkoutAndBlock}}
> If we make {{synchronized checkoutAndBlock}} that protects us against future
> changes, shouldn't cause any performance impact since the code paths will
> already be going through a sync block, and will make an IntelliJ warning go
> away.
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