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From "Gary Tully (JIRA)" <j...@apache.org>
Subject [jira] Created: (AMQ-2542) Tidy up store duplicate suppression from failover recovery - consistent store implementation with help from transportConnection
Date Mon, 21 Dec 2009 11:27:55 GMT
Tidy up store duplicate suppression from failover recovery - consistent store implementation
with help from transportConnection
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                 Key: AMQ-2542
                 URL: https://issues.apache.org/activemq/browse/AMQ-2542
             Project: ActiveMQ
          Issue Type: Improvement
          Components: Broker
    Affects Versions: 5.3.0
            Reporter: Gary Tully
             Fix For: 5.4.0


With failover - with a failure before a reply is received to a send or a transaction commit,
the send or transaction will be replayed and will be a duplicate.
The transportConnector should know that recovery/reconnection has happened and should enforce
duplicate suppression based on obtaining the last producer sequence number from the store.
Currently, duplicate suppression happens at the jdbc message store add, amq store reference
store etc... it is not consistent and it is abased on a suitable audit window which may be
non deterministic. Would be best to be fully deterministic and consistent (as in a single
persistence adapter api)

To make this perform, a transportConnection needs to be flagged as a reconnect which can precipitate
the duplicate suppression, possibly needing a wireformat update. This flag would also help
with unmatched acks after failover but maybe that flag can be in an ack...

This is relevant both when the broker is restarted or when a connection is dropped.

related issue with relevant test : https://issues.apache.org/activemq/browse/AMQ-2540

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