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https://issues.apache.org/jira/browse/ARTEMIS-473?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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clebert suconic updated ARTEMIS-473:
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Summary: Resolve split brain data after split brains scenarios. (was:
Activate server with most up-to-date journal from live/backup pair)
> Resolve split brain data after split brains scenarios.
> ------------------------------------------------------
>
> Key: ARTEMIS-473
> URL: https://issues.apache.org/jira/browse/ARTEMIS-473
> Project: ActiveMQ Artemis
> Issue Type: New Feature
> Components: Broker
> Affects Versions: 1.2.0
> Reporter: Miroslav Novak
> Priority: Critical
>
> if there are 2 live/backup pairs with replicated journal in colocated
> topology Artemis1(L1/B2) <-> Artemis2(L2/B1) then there is no easy way to
> start them if they're all shutdown.
> Problem is that there is no way how to start the servers with most up-to-date
> journal. If administrator shutdown servers in sequence Artemis1 and then
> Artemis 2. Then Artemis 2 has the most up-to-date journals because backup B1
> on server2 activated.
> Then If administrator decides to start Artemis2 then live L2 activates and
> backup B1 waits for live L1 in Artemis 1 to start. But once L1 starts then L1
> replicates its own "old" journal to B1.
> So L1 started with bad old journal. I would suggest that L1 and B1 compares
> theirs journals and figure out which one is more up-to-date. Then server with
> more up-to-date journal activates.
> In scenario described above it would be backup B1 which will activate first.
> Live L1 will synchronize its own journal from B1 and then failback happens.
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