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Lillian commented on KAFKA-8608: -------------------------------- It appears that there is not enough context in order to deduce what the warning was triggered by. [~xmar], Is it possible for you to provide the log (with redactions)? > Broker shows WARN on reassignment partitions on new brokers: Replica LEO, > follower position & Cache truncation > -------------------------------------------------------------------------------------------------------------- > > Key: KAFKA-8608 > URL: https://issues.apache.org/jira/browse/KAFKA-8608 > Project: Kafka > Issue Type: Improvement > Components: core > Affects Versions: 2.1.1 > Environment: Kafka 2.1.1 > Reporter: Di Campo > Priority: Minor > Labels: broker, reassign, repartition > > I added two brokers (brokerId 4,5) to a 3-node (brokerId 1,2,3) cluster where > there were 32 topics and 64 partitions on each, replication 3. > Running reassigning partitions. > On each run, I can see the following WARN messages, but when the reassignment > partition process finishes, it all seems OK. ISR is OK (count is 3 in every > partition). > But I get the following messages types, one per partition: > > {code:java} > [2019-06-27 12:42:03,946] WARN [LeaderEpochCache visitors-0.0.1-10] New epoch > entry EpochEntry(epoch=24, startOffset=51540) caused truncation of > conflicting entries ListBuffer(EpochEntry(epoch=22, startOffset=51540)). > Cache now contains 5 entries. (kafka.server.epoch.LeaderEpochFileCache) {code} > -> This relates to cache, so I suppose it's pretty safe. > {code:java} > [2019-06-27 12:42:04,250] WARN [ReplicaManager broker=1] Leader 1 failed to > record follower 3's position 47981 since the replica is not recognized to be > one of the assigned replicas 1,2,5 for partition visitors-0.0.1-28. Empty > records will be returned for this partition. > (kafka.server.ReplicaManager){code} > -> This is scary. I'm not sure about the severity of this, but it looks like > it may be missing records? > {code:java} > [2019-06-27 12:42:03,709] WARN [ReplicaManager broker=1] While recording the > replica LEO, the partition visitors-0.0.1-58 hasn't been created. > (kafka.server.ReplicaManager){code} > -> Here, these partitions are created. > First of all - am I supposed to be missing data here? I am assuming I don't, > and so far I don't see traces of losing anything. > If so, I'm not sure what these messages are trying to say here. Should they > really be at WARN level? If so - should the message clarify better the > different risks involved? > > -- This message was sent by Atlassian JIRA (v7.6.14#76016)