Known issues#
MirrorMaker 2 may translate offsets incorrectly if LAG shows negative on the target cluster#
The following are known issues that are expected to be resolved in version 3.3.0. See recommended tuning parameters to mitigate the impact of these issues.
MirrorMaker 2 offset sync is incorrect if the target partition is empty: https://issues.apache.org/jira/browse/KAFKA-12635
Kafka-12635: Don’t emit checkpoints for partitions without any offset: https://github.com/apache/kafka/pull/11748MM2 creates invalid checkpoint when offset mapping is not available: https://issues.apache.org/jira/browse/KAFKA-13452
Kafka-13452: MM2 shouldn’t checkpoint when offset mapping is unavailable: https://github.com/apache/kafka/pull/11492
MirrorMaker 2 is always set min.insync.replicas = 1 in destination cluster topics#
If a topic on the destination cluster is updated or pre-created with min.insync.replicas > 1 , MirrorMaker 2 would always be overwritten with min.insync.replicas = 1 in target topics.
The replication factor of target topics does not match the replication factor of source topics either when they are newly created by MirrorMaker 2, or when they exist beforehand.
MirrorMaker 2 does not update
replicas.MirrorMaker 2 always overwrites
min.insync.replicasas 1.