Mike Drob created LUCENE-9453:
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Summary: 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
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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