The default setting of prefetch=1 is causing problems
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Key: UIMA-1110
URL: https://issues.apache.org/jira/browse/UIMA-1110
Project: UIMA
Issue Type: Bug
Components: Async Scaleout
Reporter: Eddie Epstein
The new JMX monitor occasionally shows idle times of many seconds for a scaled
out remote delegate that is getting many CASes per second. Assuming the monitor
is correct, the problem is that AMQ is not evenly distributing the work to all
the service instances. Other recent experiences have demonstrated that uneven
distribution is solved with prefetch=0.
While there is some possibility that prefetch > 0 may be useful in some
situations for remote delegates, for colocated delegates there is little doubt
that a prefetch greater than 0 cannot help performance and can only screw up
load balancing.
prefetch=0 should be the default everywhere.
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