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From "Jerry Cwiklik (JIRA)" <...@uima.apache.org>
Subject [jira] Created: (UIMA-1799) UIMA AS should provide a way to increase prefetch size on a reply queue
Date Fri, 04 Jun 2010 13:58:55 GMT
UIMA AS should provide a way to increase prefetch size on a reply queue
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                 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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