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From "Gary Tully (JIRA)" <>
Subject [jira] Commented: (AMQ-1845) Message loss in network of brokers when network connection break
Date Mon, 21 Jul 2008 16:24:01 GMT


Gary Tully commented on AMQ-1845:

great, thanks for the detail. From looking at the consumer, my guess is that you are getting
duplicate messages. If you change your test to use a map and verify map.size matches what
was produced I think your test will pass. Duplicates are expected in this failure case, any
message that was dispatched but not fully acknowledged when the network dies will eventually
be redispatched as a duplicate. It is seen as in-flight by the broker.

> Message loss in network of brokers when network connection break
> ----------------------------------------------------------------
>                 Key: AMQ-1845
>                 URL:
>             Project: ActiveMQ
>          Issue Type: Bug
>          Components: Broker
>    Affects Versions: 5.1.0
>         Environment: Two brokers connected via TCP with one persistent distributed queue
and a producer and a consumer on each broker.
>            Reporter: Bryan Shaw
> Producer on broker A send 2500 message on the distributed queue at broker A.
> Producer B starts to receive message from distributed queue on broker B.
> During the receiving process, the network between these two brokers down and later brought
up again.
> In this senario, we found that some messages are lost. 
> It seems the broker A are sending message to broker B when the network is down and these
messages are removed from queue in broker A but never received by broker B which causing message
> Is this a bug or a configuration problem? 
> I thought the configuration like this is the store/forward pattern which should ensure
the message reliability in an unstable network.

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