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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