On středa 17. května 2017 16:56:25 CEST Tristan Tarrant wrote: > 2) Need a way to "rollback" the process in case of failures during the > migration: redirecting the clients back to the original cluster without > data loss. This would use the above L4 strategy.
it's not only about redirecting clients - IIRC newly created entries on target cluster are not propagated back to source cluster during rolling upgrade, so we need also somehow sync these new data back to source cluster during the rollback to avoid data losses. Same applies to "cancel process" feature
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