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https://issues.apache.org/jira/browse/QPID-2876?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Rajith Attapattu resolved QPID-2876.
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Resolution: Fixed
The failover test cases in testkit.py covers this issue.
> Design issues in Java client failover
> -------------------------------------
>
> Key: QPID-2876
> URL: https://issues.apache.org/jira/browse/QPID-2876
> Project: Qpid
> Issue Type: Bug
> Components: Java Client
> Reporter: Rajith Attapattu
> Assignee: Rajith Attapattu
> Fix For: 0.7
>
>
> The java client keeps AMQP commands in it's replay buffer in case it needs to
> replay them during failover.
> However this could cause several issues. For example,
> 1. The failover code at the JMS layer recreates subscriptions after failing
> over to a new node. However if there were message subscriptions present in
> the replay buffer and were replayed after failing over it can cause the
> subscription attempt by the JMS layer to fail if using exclusive
> subscriptions.
> 2. If there were ExchangeQuery/QueueQuery (or any command that expects a
> response) gets replayed, it will cause the broker to respond, but the JMS
> client may not have the command in it's internal map that manages
> request-response coordination. This can cause errors. See QPID-2861
> Since we are not implementing full session resume for the 0-10 client, I
> don't think there is any advantage in replaying anything other than the
> message transfers.
> The JMS client should also attempt to shrink it's in doubt window by
> periodically calling flush to get the broker to confirm the completion of the
> commands.
> This will prevent in message being duplicated unnecessarily.
> There maybe a potential bug where the Java client may not be removing
> commands even after the broker confirming them. I will create a new JIRA if
> this is confirmed.
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