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Miroslav Novak commented on ARTEMIS-473: ---------------------------------------- Sorry, the title says something different then there is in the description. I'll change description per tittle and create new jira for problem in description. > 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. -- This message was sent by Atlassian JIRA (v6.3.4#6332)