Hi, We run 0.11.01 and there was a problem with 1 ReplicationFetcher on one of the brokers - it experience out of order sequence problem for one topic/partition and was stopped. It stayed stopped over the weekend. During this time log cleanup was working and by now it has cleaned up all the data in the partitions that this fetcher was responsible for - including other partitions that didnt have out of order sequence problem at first place. It is not completely clear to me why this initial problem occurred, but at this moment there is a borker with no data for few partitions and replication fetcher fails upon restart with "org.apache.kafka.common.errors.OutOfOrderSequenceException: Invalid sequence number for new epoch: 0 (request epoch), 154277489 (seq. number)". I believe this is https://issues.apache.org/jira/browse/KAFKA-5793. However I wonder what is the easiest way of bringing this replicas back online?
Best regards, Stanislav.
