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https://issues.apache.org/jira/browse/LUCENE-5612?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13974205#comment-13974205
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Uwe Schindler commented on LUCENE-5612:
---------------------------------------

Mike, soon a completely new server and client code will come. The current one 
is bullshit because the child consumes all your port numbers... The new server 
will not have any timeout stuff anymore, it creates exactly one connection with 
every client.

bq. Can we remove this delay option (just don't sleep)? If you want to have 
some confidence locking is working, you should fully stress it out.

Without the delay it is no longer a real use-case. The test does not fail 
always, because under real circumstances it is unlikely that you hit the bug. 
With reducing the time to zero, we may hide other bugs.

But if we have another lock factory it could fail for another reason, so we 
should really hold the lock for a certain time.

> LockStressTest fails always with NativeFSLockFactory
> ----------------------------------------------------
>
>                 Key: LUCENE-5612
>                 URL: https://issues.apache.org/jira/browse/LUCENE-5612
>             Project: Lucene - Core
>          Issue Type: Bug
>            Reporter: Robert Muir
>            Priority: Blocker
>             Fix For: 4.8
>
>         Attachments: LUCENE-5612-instant-crush.patch, 
> LUCENE-5612-instant-crush.patch, 
> LUCENE-5612-more-sophisticated-crusher.patch, 
> LUCENE-5612-more-sophisticated-crusher.patch, 
> LUCENE-5612-more-sophisticated-crusher.patch, LUCENE-5612-tester.patch, 
> LUCENE-5612-tester.patch, LUCENE-5612.patch
>
>
> I was looking at this, because i wanted to remove the static map inside 
> NativeFSLockFactory (no particular reason: it just smells bad, we require 
> java7, and you get overlappingexception as of java6 so its unnecessary).
> Before changing any code, i wanted to run lockstresstest first, just to 
> ensure it works: but it fails always. Simple works fine always.
> Exception in thread "main" java.lang.RuntimeException: 
> java.lang.RuntimeException: lock was double acquired at 
> org.apache.lucene.store.VerifyingLockFactory$CheckedLock.verify(VerifyingLockFactory.java:67)



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