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From "Vadim Pesochinskiy (JIRA)" <>
Subject [jira] Created: (AMQ-855) Add support for prefetchSize = 0
Date Tue, 01 Aug 2006 17:29:23 GMT
Add support for prefetchSize = 0

                 Key: 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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