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From "Jerry Cwiklik (JIRA)" <...@uima.apache.org>
Subject [jira] Created: (UIMA-1800) UIMA AS should block msg submitter thread if a thread pool is empty
Date Fri, 04 Jun 2010 14:34:58 GMT
UIMA AS should block msg submitter thread if a thread pool is empty
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                 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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