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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