Tomasz Gański created KAFKA-4760:
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Summary: Restarting one MirrorMaker causes a global pause in
mirroring.
Key: KAFKA-4760
URL: https://issues.apache.org/jira/browse/KAFKA-4760
Project: Kafka
Issue Type: Improvement
Reporter: Tomasz Gański
Attachments: 1_mm_stop.png
When 1 MirrorMaker is restarted in consumer group, the whole consumer group
stop working and lead to big consumer lag.
!1_mm_stop.png|thumbnail!
It becoming huge problem when you want keep system stable and guarantee that
crucial messages come as soon as possible. In this case each deployment or
setting change is risky.
It would be grate if MirrorMaker could rejoin to previous assigned partitions
and not caused consumer group rebalance.
The rejoins to existing consumer group is based on *memberId* and *group
generation id*. I would nice if it would be possible to make them persistence
and keep this variable during MirrorMaker restart.
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