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https://issues.apache.org/jira/browse/KAFKA-12150?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Chris Egerton resolved KAFKA-12150.
-----------------------------------
Resolution: Duplicate
> Consumer group refresh not working with clustered MM2 setup
> -----------------------------------------------------------
>
> Key: KAFKA-12150
> URL: https://issues.apache.org/jira/browse/KAFKA-12150
> Project: Kafka
> Issue Type: Bug
> Components: mirrormaker
> Affects Versions: 2.7.0
> Reporter: Ara Zarifian
> Priority: Major
>
> I'm running MM2 with Kafka 2.7 with the following configuration:
> {code}
> clusters = eastus2, westus
> eastus2.bootstrap.servers = clusrter1.example.com:9092
> westus.bootstrap.servers = cluster2.example.com:9092
> eastus2->westus.enabled = true
> eastus2->westus.topics = .*
> westus->eastus2.enabled = true
> westus->eastus2.topics = .*
> refresh.topics.enabled = true
> refresh.topics.interval.seconds = 5
> refresh.groups.enabled = true
> refresh.groups.interval.seconds = 5
> sync.topic.configs.enabled = true
> sync.topic.configs.interval.seconds = 5
> sync.topic.acls.enabled = false
> sync.topic.acls.interval.seconds = 5
> sync.group.offsets.enabled = true
> sync.group.offsets.interval.seconds = 5
> emit.checkpoints.enabled = true
> emit.checkpoints.interval.seconds = 5
> emit.heartbeats.enabled = true
> emit.heartbeats.interval.seconds = 5
> replication.factor = 3
> checkpoints.topic.replication.factor = 3
> heartbeats.topic.replication.factor = 3
> offset-syncs.topic.replication.factor = 3
> offset.storage.replication.factor = 3
> status.storage.replication.factor = 3
> config.storage.replication.factor = 3
> {code}
> More specifically, I'm running multiple instances of MM2 with the above
> configuration within Kubernetes pods. I was testing the new automatic
> consumer group offset translation functionality and noticed what appears to
> be a problem when running more than 1 instance of MM2 in this fashion.
> Based on [the
> KEP|https://cwiki.apache.org/confluence/display/KAFKA/KIP-382%3A+MirrorMaker+2.0],
> I should be able to run multiple instances in this manner (see "Running a
> dedicated MirrorMaker cluster"), however, I noticed that when enabling
> replication using a 3-instance MM2 cluster, consumer groups were not
> synchronizing across clusters at all.
> When running through my test case with a single MM2 instance, consumer group
> synchronization appears to work as expected consistently. When running
> through my 3-node test case, synchronization begins as soon as I scale the
> number of replicas to 1.
> Am I misinterpreting the manner in which the KEP describes MM2 clusters or is
> this interaction an unexpected one?
>
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