Miroslav Novak created ARTEMIS-473:
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Summary: Activate server with most up-to-date journal from
live/backup pair
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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