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https://issues.apache.org/jira/browse/KAFKA-12498?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Olumide Ajiboye updated KAFKA-12498:
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Summary: Consumer Group Lag is zero when MirrorMaker 2.0 is running (was:
Consumer Group is zero when MirrorMaker 2.0 is running)
> Consumer Group Lag is zero when MirrorMaker 2.0 is running
> ----------------------------------------------------------
>
> Key: KAFKA-12498
> URL: https://issues.apache.org/jira/browse/KAFKA-12498
> Project: Kafka
> Issue Type: Bug
> Components: consumer, replication
> Affects Versions: 2.7.0
> Environment: Kubernetes 1.19.7
> Strimzi 0.21.1
> Reporter: Olumide Ajiboye
> Priority: Major
>
> I have two Kafka clusters in Active\Passive replication using MM 2.0.
> When I produce messages to a topic and try to read from it in the same
> cluster, the consumer group lag is already set to zero. The replica topic
> also has the same lag and log-end-offset.
> My MM2 is using a superuser account and I am using a separate consumer-group
> with permission just to read and write to this topic.
> Just to elaborate further, * Write 10 messages to a topic without any active
> consumers but with MM2 replicating the topic to a passive Cluster.
> * Attempt to read 3 messages from the topic, this creates my consumer group
> and adds an active consumer. The result is no messages are read
> * Describe the consumer group, the result shows Log-End-Offset with correct
> number of messages, but Lag shows 0
> * Attempt to read 3 messages from passive cluster using same consumer-group.
> Result: no messages consumed, Lag shows 0, Log-End-Offset shows correct
> number of messages (i.e. same as active cluster)
> * Keep consumer running
> * Write a few more messages.
> * Consumer is now reading latest messages
> * Stop consumer
> * Keep writing new messages
> * Lag shows correct value.
> In the absence of MM2, Kafka operation is as expected.
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