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https://issues.apache.org/jira/browse/ARTEMIS-1427?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16173672#comment-16173672
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Justin Bertram commented on ARTEMIS-1427:
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I believe this is due to a misconfiguration. If you want to start your live
again then you either need to shut-down the backup first or add
<check-for-live-server> to your live server's configuration to ensure the live
will check for another live on the network with its same node ID.
> Warning messages in broker logs upon restarting "master" broker.
> ----------------------------------------------------------------
>
> Key: ARTEMIS-1427
> URL: https://issues.apache.org/jira/browse/ARTEMIS-1427
> Project: ActiveMQ Artemis
> Issue Type: Bug
> Components: Broker
> Affects Versions: 1.5.3
> Environment: Linux 2.6.18-419.el5 #1 SMP Wed Feb 22 22:40:57 EST 2017
> x86_64 x86_64 x86_64 GNU/Linux
> Reporter: Boris Godunov
>
> I have 2 brokers, one is master and another one is slave. When i stop master,
> slave becomes live and everything looks fine. But when i start master back
> up, the logs of both brokers are flooded with the following warning messages:
> 13:54:24,106 WARN [org.apache.activemq.artemis.core.client] AMQ212034: There
> are more than one servers on the network broadcasting the same node id. You
> will see this message exactly once (per node) if a node is restarted, in
> which case it can be safely ignored. But if it is logged continuousl
> y it means you really do have more than one node on the same network active
> concurrently with the same node id. This could occur if you have a backup
> node active at the same time as its live node.
> nodeID=ef2c7a0d-9e24-11e7-8dd6-e83935127c4c
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