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https://issues.apache.org/jira/browse/ARTEMIS-4555?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Justin Bertram resolved ARTEMIS-4555.
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Resolution: Information Provided
> ActiveMq Artemis can have two live brokers in one cluster at one time
> ---------------------------------------------------------------------
>
> Key: ARTEMIS-4555
> URL: https://issues.apache.org/jira/browse/ARTEMIS-4555
> Project: ActiveMQ Artemis
> Issue Type: Bug
> Components: Broker, Clustering
> Affects Versions: 2.30.0
> Reporter: Sophia
> Priority: Major
>
> An ActiveMq Artemis cluster can have two live brokers that can receive
> requests at the same time. This happens if the communication drops between
> the live broker and the passive broker.
>
> We deploy ActiveMQ Artemis v(2.30.0) on a five nodes cluster with Ubuntu
> 18.04. The cluster consists of a master broker and three backup brokers. We
> deploy classic replication with three backups for the master broker. One of
> the backup brokers announces its status as a passive backup for the live
> broker.
>
> If the communication breaks between the live and the passive broker, the
> passive broker changes its status to live and starts accepting messages. A
> warning message appears on all nodes telling that there are two live brokers
> in the cluster. When we fix the network problem, the cluster still has two
> live brokers that can accept requests. Although we set allow-fail-back to
> true on the backups config which should force the backup that has become live
> to automatically stop when the live is back.
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