Di Campo created KAFKA-8608:
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Summary: Broker shows WARN on reassignment partitions on new
brokers: Replica LEO & 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
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 - what are they warning about?
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