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https://issues.apache.org/jira/browse/UIMA-4210?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Marshall Schor updated UIMA-4210:
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Component/s: (was: Eclipse plugins)
Async Scaleout
> Client hangs with more than 1 time-out
> --------------------------------------
>
> Key: UIMA-4210
> URL: https://issues.apache.org/jira/browse/UIMA-4210
> Project: UIMA
> Issue Type: Bug
> Components: Async Scaleout
> Affects Versions: 2.4.2AS
> Environment: Java 7, Mac OS
> Reporter: Frank Xu
> Labels: client, hangs
> Original Estimate: 504h
> Remaining Estimate: 504h
>
> The client hangs if the execution has two time-outs. After debugging into the
> issue, we figure out that the resending mechanism has some bugs in it. Here
> are the detailed description.
> Please review the necessity for the invocation of sendCAS(). In our system,
> we don't have to resend the CAS to process again. Please provide a
> configuration so that we don't have to resend the CAS every time there is a
> time out.
> Whenever there is the first time-out,
> BaseUIMAAsynchronousEngine_impl#notifyOnTimout() is invoked and it hangs when
> it tries to invoke sendCas() at line 2385. I believe the reason is that the
> sendCAS() is a synchronized method and a potential threading issue causes
> this thread hang over there. Please be noted that this block is also
> synchronized.
> Then when there is a second time-out, it will be hanging in the very
> beginning of the method notifyOnTimeout() and cannot clear the time-out CAS
> from the CAS list, which hangs the entire client.
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