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https://issues.apache.org/jira/browse/LUCENE-6499?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14558940#comment-14558940
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Uwe Schindler commented on LUCENE-6499:
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bq. he first one keeps an even starting line for all the threads involved; with
countdownlatch you could have the countDown() thread proceed long before any
other threads reach await.
I agree, if you would have multiple threads starting - you don't know which one
comes first. But the main thread here is already running; the "assumption" for
the shotgun approach used in other tests is that spawning a thread takes some
time, while a already running thread just runs so always comes earlier to the
barrier point. I am fine with both solutions :-)
In any case, neither the cyclic barrier nor the latch guarantee that all
threads really start at same time :-) It is just like with horses waiting for
the starting gun to be fired. If one of the horses breaks its leg while
starting or wants to drink something...
> WindowsFS misses to remove open file handle if file is concurrently deleted
> ---------------------------------------------------------------------------
>
> Key: LUCENE-6499
> URL: https://issues.apache.org/jira/browse/LUCENE-6499
> Project: Lucene - Core
> Issue Type: Bug
> Components: modules/test-framework
> Affects Versions: 5.1
> Reporter: Simon Willnauer
> Fix For: Trunk, 5.3
>
> Attachments: LUCENE-6499.patch, LUCENE-6499.patch
>
>
> WindowsFs has some race conditions when files are concurrently opened and
> deleted. A file might be successfully opened while concurrently deleted which
> should be prevented by the WindowsFS with an IOException / access denied. The
> problem is that we try to remove the leaked file handle form the internal map
> on close which fails since we fail to read the key from the filesystem since
> it has already been deleted. This manifests in subsequent `access denied`
> exceptions even though all streams on the file are closed.
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