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https://issues.apache.org/jira/browse/LUCENE-5362?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13841645#comment-13841645
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Michael McCandless commented on LUCENE-5362:
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It's somewhat crazy for an app to be closing AND trying to reopen at the same
time (i.e. results can be "unpredictable", just like in IW), but I agree we
should make a best effort here if the code changes are minor.
I think we can just change incRef to call tryIncRef, and then throw ACE if
tryIncRef returns false?
> IndexReader and friends should check ref count when incrementing
> ----------------------------------------------------------------
>
> Key: LUCENE-5362
> URL: https://issues.apache.org/jira/browse/LUCENE-5362
> Project: Lucene - Core
> Issue Type: Improvement
> Affects Versions: 4.6
> Reporter: Simon Willnauer
> Fix For: 5.0, 4.7
>
>
> IndexReader and SegmentCoreReaders blindly increments it's refcount which
> could already be counted down to 0 which might allow an IndexReader to "rise
> from the dead" and use an already closed SCR instance. Even if that is caught
> we should try best effort to raise ACE asap.
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