Philipp Dallig created KAFKA-15985:
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             Summary: Mirrormaker 2 offset sync is incomplete
                 Key: KAFKA-15985
                 URL: https://issues.apache.org/jira/browse/KAFKA-15985
             Project: Kafka
          Issue Type: Bug
    Affects Versions: 3.5.1
            Reporter: Philipp Dallig


We are currently trying to migrate between two Kafka clusters using Mirrormaker2

new kafka cluster version: 7.5.2-ccs
old kafka cluster version: kafka_2.13-2.8.0

The Mirrormaker 2 process runs on the new cluster (target cluster)

My main problem: The lag in the target cluster is not the same as in the source 
cluster.

target cluster
{code}
GROUP           TOPIC                    PARTITION  CURRENT-OFFSET  
LOG-END-OFFSET  LAG             CONSUMER-ID     HOST            CLIENT-ID
test-sync-5     kafka-replication-test-5 0          3637            3668        
    31              -               -               -
{code}

source cluster
{code]
GROUP           TOPIC                    PARTITION  CURRENT-OFFSET  
LOG-END-OFFSET  LAG             CONSUMER-ID     HOST            CLIENT-ID
test-sync-5     kafka-replication-test-5 0          3668            3668        
    0               -               -               -
{code}



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