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Posted to jira@kafka.apache.org by "Zhang Jianguo (Jira)" <ji...@apache.org> on 2021/03/19 02:43:00 UTC
[jira] [Comment Edited] (KAFKA-8608) Broker shows WARN on
reassignment partitions on new brokers: Replica LEO, follower position &
Cache truncation
[ https://issues.apache.org/jira/browse/KAFKA-8608?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17304601#comment-17304601 ]
Zhang Jianguo edited comment on KAFKA-8608 at 3/19/21, 2:42 AM:
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[~LillianY]
I meet the same issue.
[2021-03-18 17:37:30,799] WARN [ReplicaManager broker=15] Leader 15 failed to record follower 18's position 308399, and last sent HW since the replica is not recognized to be one of the assigned replicas 15,16 for partition Collect-gnodeb-24. Empty records will be returned for this partition. (kafka.server.ReplicaManager)
After controller switched from 14 to 15, it looks like kafka became abnormal. It didn't work even if I restart brokers.
*Logs of Broker 14*
!image-2021-03-19-10-36-04-328.png!
!image-2021-03-19-10-41-44-952.png!
!image-2021-03-19-10-42-16-296.png!
!image-2021-03-19-10-42-32-759.png!
*producer LOG*
!image-2021-03-19-10-41-03-203.png!
*Consumer got timeout exception:*
*!image-2021-03-19-10-39-24-728.png!*
was (Author: alberyzjg):
[~LillianY]
I meet the same issue.
[2021-03-18 17:37:30,799] WARN [ReplicaManager broker=15] Leader 15 failed to record follower 18's position 308399, and last sent HW since the replica is not recognized to be one of the assigned replicas 15,16 for partition Collect-gnodeb-24. Empty records will be returned for this partition. (kafka.server.ReplicaManager)
After controller switched from 14 to 15, it looks like kafka became abnormal. It didn't work even if I restart brokers.
!image-2021-03-19-10-36-04-328.png!
!image-2021-03-19-10-37-35-183.png!
!image-2021-03-19-10-38-11-280.png!
!image-2021-03-19-10-38-22-154.png!
*producer LOG*
*!image-2021-03-19-10-38-38-396.png!*
*Consumer got timeout exception:*
*!image-2021-03-19-10-39-24-728.png!*
> 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
> Attachments: image-2021-03-19-10-36-04-328.png, image-2021-03-19-10-39-24-728.png, image-2021-03-19-10-41-03-203.png, image-2021-03-19-10-41-44-952.png, image-2021-03-19-10-42-16-296.png, image-2021-03-19-10-42-32-759.png
>
>
> 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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