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From "Gary Tully (JIRA)" <j...@apache.org>
Subject [jira] Created: (AMQ-2020) Messages are arriving out of sequence with large message volumes
Date Tue, 02 Dec 2008 13:02:05 GMT
Messages are arriving out of sequence with large message volumes
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                 Key: AMQ-2020
                 URL: https://issues.apache.org/activemq/browse/AMQ-2020
             Project: ActiveMQ
          Issue Type: Bug
          Components: Broker
    Affects Versions: 5.2.0
         Environment: all
            Reporter: Gary Tully
            Assignee: Gary Tully
             Fix For: 5.3.0


With large volumes of messages, some messages can arrive out of order on occasion. Scenario
is hard to reproduce but a single producer and single consumer can cause the problem if the
volume is sufficiently high. The Producer needs to exceed the memory limit such that the cache
is filled and when the broker moves over to the store from the cache, the consumer need to
ack a message that will be redelivered from the store but would normally be suppressed as
a duplicate. 
One way to avoid the problem is to disable the cache for a Queue:
{code}
<amq:policyEntry queue=">" useCache="false" >
{code}

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