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From "Gary Tully (JIRA)" <j...@apache.org>
Subject [jira] Resolved: (AMQ-2704) Non durable TopicSubscriptions can get duplicate messages in a network of brokers ring - suppression works in the stores and for durables
Date Wed, 21 Apr 2010 16:49:22 GMT

     [ https://issues.apache.org/activemq/browse/AMQ-2704?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Gary Tully resolved AMQ-2704.
-----------------------------

    Resolution: Fixed

resolved in r936390

TopicSubscription now respects the PolicyEntry.enableAudit (enabled once a matching policy
entry is found) which allows duplicates to be suppressed in the same way as the message stores
and cursors suppress duplicates.
A topic sub in a ring network will not now get duplicate messages.

> Non durable TopicSubscriptions can get duplicate messages in a network of brokers ring
- suppression works in the stores and for durables
> -----------------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: AMQ-2704
>                 URL: https://issues.apache.org/activemq/browse/AMQ-2704
>             Project: ActiveMQ
>          Issue Type: Bug
>    Affects Versions: 5.3.1
>            Reporter: Gary Tully
>            Assignee: Gary Tully
>             Fix For: 5.4.0
>
>
> With a ring topology some duplicates are inevitable, Brokers A,B,C,D - producer on A,
consumer on C, paths A-B-C and A-D-C are identical. When the subscription is backed by a store,
the store traps/suppresses the duplicate. A regular Topic sub does not have such suppression
as it does not use a message cursor, just regular direct dispatch.
> A regular topic sub needs some duplicate suppression in line with the PolicyEntry enableAudit.

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