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https://issues.apache.org/jira/browse/UIMA-1799?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jerry Cwiklik closed UIMA-1799.
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Resolution: Fixed
Modified UIMA AS listener code to override prefetch on a reply queue. The
override value comes from the scaleout factor defined on a reply queue in the
deployment descriptor.
> UIMA AS should provide a way to increase prefetch size on a reply queue
> -----------------------------------------------------------------------
>
> Key: UIMA-1799
> URL: https://issues.apache.org/jira/browse/UIMA-1799
> Project: UIMA
> Issue Type: Improvement
> Components: Async Scaleout
> Affects Versions: 2.3AS
> Reporter: Jerry Cwiklik
> Assignee: Jerry Cwiklik
>
> UIMA AS currently provides no way to change prefetch size on a reply queue. A
> default of 1 is used. This slows down the rate of processing messages by a
> service. Each UIMA AS service has a dedicated submitter thread whose main job
> is to deliver a message to a thread pool for processing. Since the submitter
> thread executes very fast and the prefetch=1 , the submitter thread is
> constantly waiting for the Broker to deliver the next message. Increasing
> prefetch forces the Broker to deliver multiple messages to a service which
> buffers them until the submitter thread is ready. The size of the prefetch
> should be equal to a scalout factor defined on each reply queue. The default
> is still 1.
> NOTE: increasing prefetch effects memory requirement for the service. The
> larger the prefetch the more messages are buffered taking up more memory.
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