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https://issues.apache.org/jira/browse/AMQ-5279?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Gary Tully resolved AMQ-5279.
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Resolution: Fixed
fix in http://git-wip-us.apache.org/repos/asf/activemq/commit/c34851fd
> failover redelivery to alternative consumers with pending transaction causes
> rollback *and* dlq processing
> -----------------------------------------------------------------------------------------------------------
>
> Key: AMQ-5279
> URL: https://issues.apache.org/jira/browse/AMQ-5279
> Project: ActiveMQ
> Issue Type: Bug
> Components: JMS client
> Affects Versions: 5.10.0
> Reporter: Gary Tully
> Assignee: Gary Tully
> Labels: dlq, failover, redelivery, transaction
> Fix For: 5.11.0
>
>
> failover isolates the application client from transport failures. For a
> single consumer, if there is a pending transaction and an ack is lost the
> transaction can still commit after failover if the messages is redispatched.
> If it is not redispatched, then the transaction will rollback.
> With multiple consumers it is possible that an alternative consumer will get
> redelivery. If the alternative consumer is on a different connection the
> duplicate dispatch (tracked by a connection) is not identified, redelivery
> ensues and the pending transaction rolls back.
> If the consumer is on the same connection, the redelivery is treated as a
> duplicate, the message gets a poison ack and the pending transaction rolls
> back. This is a double whammy and results in a delivery to the DLQ in error.
> The redelivery should be routed to the alternative consumer as if it were on
> a different connection so that the message can be consumed.
> We should DLQ only when the redispatch is not pending on any consumer.
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