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https://issues.apache.org/jira/browse/UIMA-5883?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Lou DeGenaro closed UIMA-5883.
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> DUCC JobDriver (JD) may cause job to never process all work items if
> JobProcess (JP) is preempted
> -------------------------------------------------------------------------------------------------
>
> Key: UIMA-5883
> URL: https://issues.apache.org/jira/browse/UIMA-5883
> Project: UIMA
> Issue Type: Bug
> Components: DUCC
> Reporter: Lou DeGenaro
> Assignee: Lou DeGenaro
> Priority: Major
> Fix For: 2.2.3-Ducc
>
>
> Noticed on Apache DUCC demo that Job 14493 had work items total=10001,
> completed=9986, dispatch=15, and made no further progress. Looking in
> work-item-state.json we see the 9986 that have completed and can infer
> precisely those that did not. Then looking in the JD log for those not yet
> complete work items, we see entries similar to:
> 25 Sep 2018 23:28:28,042 WARN ActionGet - T[14] engage seqNo=?
> remote=uima-ducc-demo-6.8448.25 node=uima-ducc-demo-6 pid=8448 text=process
> discontinued
> Looking at the code, we see that under this condition that the JD has
> obtained a CAS from the CR, but chooses not to give it to the requesting JP
> process since JD knows that the requester has been targeted for termination
> (e.g. preempted). But the JD forgets to put the CAS back into the queue!
> And therefore those CASes never get processed and the Job is hung forevermore.
>
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