Sophia created ARTEMIS-4555:
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Summary: 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
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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