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https://issues.apache.org/jira/browse/UIMA-1800?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jerry Cwiklik reopened UIMA-1800:
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Revert to previous version that is not using BlockingThreadExecutor.
> UIMA AS should block msg submitter thread if a thread pool is empty
> -------------------------------------------------------------------
>
> Key: UIMA-1800
> URL: https://issues.apache.org/jira/browse/UIMA-1800
> Project: UIMA
> Issue Type: Bug
> Components: Async Scaleout
> Affects Versions: 2.3AS
> Reporter: Jerry Cwiklik
> Assignee: Jerry Cwiklik
>
> If a queue scaleout factor > 1, the UIMA AS creates a thread pool and a
> managing Executor object. The threads in a pool are used to process incoming
> messages. A submitter thread receives a jms message via a callback from
> Spring and delivers it to the Executor for processing in one of the threads
> from the pool. If a thread pool is empty, the Executor policy is to use the
> submitter thread to process the message. Since there is a single submitter
> thread (per queue) this policy slows down the submitter thread and prevents
> it from delivering messages for processing by other threads.
>
> Change the code to prevent the submitter thread from doing processing.
> Instead, block the submitter thread if the thread pool becomes empty. As soon
> as a thread becomes available, the submitter thread should deliver a message
> and wait for a callback from Spring.
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