[jira] [Created] (KAFKA-14797) MM2 does not emit offset syncs when conservative translation logic exceeds positive max.offset.lag

["Greg Harris (Jira)" <ji...@apache.org>]

Greg Harris created KAFKA-14797:
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             Summary: MM2 does not emit offset syncs when conservative translation logic exceeds positive max.offset.lag
                 Key: KAFKA-14797
                 URL: https://issues.apache.org/jira/browse/KAFKA-14797
             Project: Kafka
          Issue Type: Bug
          Components: mirrormaker
            Reporter: Greg Harris
            Assignee: Greg Harris


This is a regression in MirrorMaker 2 introduced by KAFKA-12468.

Reproduction steps:
1. Set max.offset.lag to a non-zero value.
2. Set up a 1-1 replication flow which does not skip upstream offsets or have a concurrent producer to the target topic.
3. Produce more than max.offset.lag records to the source topic and allow replication to proceed.
4. Examine end offsets, checkpoints and/or target consumer group lag

Expected behavior:
Consumer group lag should be at most max.offset.lag.

Actual behavior:
Consumer group lag is significantly larger than max.offset.lag.



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