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https://issues.apache.org/jira/browse/KAFKA-8608?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16891715#comment-16891715
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Di Campo commented on KAFKA-8608:
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Hi Lillian,
I'm afraid I can't, If it happens again, which context do you need? Full broker
logs for that amount of time?
> 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?
>
>
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