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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