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Edoardo Comar commented on KAFKA-15144: --------------------------------------- producing 1 record at a time with th console producer, while a consumer is polling (on source) the MM2 logs report : {{[2023-07-03 17:44:49,479] DEBUG [MirrorCheckpointConnector|task-0] translateDownstream(edogroup,vf-mirroring-test-edo-0,0): Translated 0 (relative to OffsetSync\{topicPartition=vf-mirroring-test-edo-0, upstreamOffset=0, downstreamOffset=0}) (org.apache.kafka.connect.mirror.OffsetSyncStore:161)}} {{[2023-07-03 17:44:49,479] TRACE [MirrorCheckpointConnector|task-0] Emitting Checkpoint\{consumerGroupId=edogroup, topicPartition=source.vf-mirroring-test-edo-0, upstreamOffset=0, downstreamOffset=0, metadata=} (first for this partition) (org.apache.kafka.connect.mirror.MirrorCheckpointTask:204)}} {{...}} {{[2023-07-03 17:44:54,510] DEBUG [MirrorCheckpointConnector|task-0] translateDownstream(edogroup,vf-mirroring-test-edo-0,1): Translated 1 (relative to OffsetSync\{topicPartition=vf-mirroring-test-edo-0, upstreamOffset=0, downstreamOffset=0}) (org.apache.kafka.connect.mirror.OffsetSyncStore:161)}} {{[2023-07-03 17:44:54,511] TRACE [MirrorCheckpointConnector|task-0] Emitting Checkpoint\{consumerGroupId=edogroup, topicPartition=source.vf-mirroring-test-edo-0, upstreamOffset=1, downstreamOffset=1, metadata=} (downstream offset advanced) (org.apache.kafka.connect.mirror.MirrorCheckpointTask:214)}} {{...}} {{[2023-07-03 17:45:04,547] DEBUG [MirrorCheckpointConnector|task-0] translateDownstream(edogroup,vf-mirroring-test-edo-0,2): Translated 1 (relative to OffsetSync\{topicPartition=vf-mirroring-test-edo-0, upstreamOffset=0, downstreamOffset=0}) (org.apache.kafka.connect.mirror.OffsetSyncStore:161)}} {{[2023-07-03 17:45:04,548] TRACE [MirrorCheckpointConnector|task-0] *Skipping* Checkpoint{consumerGroupId=edogroup, topicPartition=source.vf-mirroring-test-edo-0, u{*}pstreamOffset=2, downstreamOffset=1{*}, metadata=} (repeated checkpoint) (org.apache.kafka.connect.mirror.MirrorCheckpointTask:220)}} > MM2 Checkpoint downstreamOffset stuck to 1 > ------------------------------------------ > > Key: KAFKA-15144 > URL: https://issues.apache.org/jira/browse/KAFKA-15144 > Project: Kafka > Issue Type: Bug > Components: mirrormaker > Reporter: Edoardo Comar > Assignee: Edoardo Comar > Priority: Major > Attachments: edo-connect-mirror-maker-sourcetarget.properties > > > Steps to reproduce : > 1.Start the source cluster > 2.Start the target cluster > 3.Start connect-mirror-maker.sh using a config like the attached > 4.Create a topic in source cluster > 5.produce a few messages > 6.consume them all with autocommit enabled > > 7. then dump the Checkpoint topic content e.g. > {{% bin/kafka-console-consumer.sh --bootstrap-server localhost:9192 --topic > source.checkpoints.internal --from-beginning --formatter > org.apache.kafka.connect.mirror.formatters.CheckpointFormatter}} > {{{}Checkpoint{consumerGroupId=edogroup, > topicPartition=source.vf-mirroring-test-edo-0, upstreamOffset=3, > {*}downstreamOffset=1{*}, metadata={}}}} > > the downstreamOffset remains at 1, while, in a fresh cluster pair like with > the source topic created while MM2 is running, > I'd expect the downstreamOffset to match the upstreamOffset. > Note that dumping the offset sync topic, shows matching initial offsets > {{% bin/kafka-console-consumer.sh --bootstrap-server localhost:9192 --topic > mm2-offset-syncs.source.internal --from-beginning --formatter > org.apache.kafka.connect.mirror.formatters.OffsetSyncFormatter}} > {{{}OffsetSync{topicPartition=vf-mirroring-test-edo-0, upstreamOffset=0, > downstreamOffset=0{}}}} > > > -- This message was sent by Atlassian Jira (v8.20.10#820010)