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From "Jerry Cwiklik (JIRA)" <...@uima.apache.org>
Subject [jira] [Closed] (UIMA-4210) Client hangs with more than 1 time-out
Date Fri, 16 Sep 2016 20:53:20 GMT

     [ https://issues.apache.org/jira/browse/UIMA-4210?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Jerry Cwiklik closed UIMA-4210.
-------------------------------
    Resolution: Cannot Reproduce

Closing since I am not able to reproduce the problem. The cause of the hang was fixed in one
of the other JIRAs mentioned in the thread.

> 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
>             Fix For: 2.9.0AS
>
>   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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