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Posted to dev@uima.apache.org by "Jerry Cwiklik (JIRA)" <de...@uima.apache.org> on 2010/06/04 17:44:56 UTC
[jira] Closed: (UIMA-1799) UIMA AS should provide a way to increase
prefetch size on a reply queue
[ https://issues.apache.org/jira/browse/UIMA-1799?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Jerry Cwiklik closed UIMA-1799.
-------------------------------
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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