Add support for prefetchSize = 0
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Key: AMQ-855
URL: https://issues.apache.org/activemq/browse/AMQ-855
Project: ActiveMQ
Issue Type: New Feature
Components: Broker
Affects Versions: 4.0.2, 4.0.1, 4.0
Environment: any
Reporter: Vadim Pesochinskiy
Priority: Critical
Fix For: 4.2
This feature would enable to support following test case:
2 servers are processing 3 submitted jobs with following processing times 10
min, 1 min, 1 min. This sequence should finish in 10 minutes as one service
will pick up the 10 minutes job, meanwhile the other one should manage the two
1 minute jobs. Since I cannot set prefetchSize=0, one of the 1 minute jobs is
sitting in prefetch buffer and the jobs are processed in 11 minutes instead of
10.
This is simplification of the real scenario where I have about 30 consumers
submitting jobs to 20 consumers through AMQ 4.0.1. I have following problems:
Messages are sitting in prefetch buffer are not available to processors,
which results in a lot of idle time.
Order of processing is random. For some reason Job # 20 is processed after
Job # 1500. Since senders are synchronously blocked this can result in
time-outs.
Some requests are real-time, i.e. there is a user waiting, so the system
cannot wait, so AMQ-850 does not fix this issue.
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