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https://issues.apache.org/jira/browse/UIMA-1540?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12751346#action_12751346
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Jörn Kottmann commented on UIMA-1540:
-------------------------------------
Its always nice to refactore things, but I would like to keep the focus on
finding the bugs related to this issue,
if you think it should be refactored please open a new jira issue for that.
The current status is that the implementation now uses a semaphore to wait for
a free CAS. The change caused two new
errors in my client which occur depending on the timing.
Exception in thread "main" org.apache.uima.cas.CASRuntimeException: Data for
Sofa feature setLocalSofaData(String) has already been set.
at org.apache.uima.cas.impl.SofaFSImpl.setLocalSofaData(SofaFSImpl.java:105)
at org.apache.uima.cas.impl.CASImpl.setSofaDataString(CASImpl.java:4102)
at org.apache.uima.cas.impl.CASImpl.setDocumentText(CASImpl.java:4087)
at Retag.main(Retag.java:89)
or
Exception in thread "main" java.lang.NullPointerException
at Retag.main(Retag.java:89)
To find these errors Jerry added a test TestUimaASExtended.testClientProcess
which runs fine on my machine. I will now further investigate what could cause
the issue and report back.
Jörn
> Uima AS client consumes too much CPU while waiting for a free CAS
> ------------------------------------------------------------------
>
> Key: UIMA-1540
> URL: https://issues.apache.org/jira/browse/UIMA-1540
> Project: UIMA
> Issue Type: Bug
> Components: Async Scaleout
> Affects Versions: 2.2.2AS
> Reporter: Jerry Cwiklik
> Assignee: Jerry Cwiklik
> Fix For: 2.3AS
>
>
> The UIMA AS client enters a busy loop in the getCAS() in
> BaseUIMAAsynchronousEngineCommon_impl. Since a CAS instance may not be
> available for awhile, this code wastes CPU cycles by continuously testing for
> null and trying again. Put the thread to sleep for some time before testing
> for CAS availability again.
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