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https://issues.apache.org/jira/browse/KAFKA-7704?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16711009#comment-16711009
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Yu Yang commented on KAFKA-7704:
--------------------------------
[~huxi_2b], [~junrao] I verified that
https://github.com/apache/kafka/pull/5998 does fix the maxlag metric issue.
Thanks for the quick fix!
> kafka.server.ReplicaFetechManager.MaxLag.Replica metric is reported
> incorrectly
> -------------------------------------------------------------------------------
>
> Key: KAFKA-7704
> URL: https://issues.apache.org/jira/browse/KAFKA-7704
> Project: Kafka
> Issue Type: Bug
> Components: metrics
> Affects Versions: 2.1.0
> Reporter: Yu Yang
> Assignee: huxihx
> Priority: Major
> Attachments: Screen Shot 2018-12-03 at 4.33.35 PM.png
>
>
> We recently deployed kafka 2.1, and noticed a jump in
> kafka.server.ReplicaFetcherManager.MaxLag.Replica metric. At the same time,
> there is no under-replicated partitions for the cluster.
> The initial analysis shows that kafka 2.1.0 does not report metric correctly
> for topics that have no incoming traffic right now, but had traffic earlier.
> For those topics, ReplicaFetcherManager will consider the maxLag be the
> latest offset.
> For instance, we have a topic named `test_topic`:
> {code}
> [root@kafkabroker03002:/mnt/kafka/test_topic-0]# ls -l
> total 8
> -rw-rw-r-- 1 kafka kafka 10485760 Dec 4 00:13 00000000099043947579.index
> -rw-rw-r-- 1 kafka kafka 0 Sep 23 03:01 00000000099043947579.log
> -rw-rw-r-- 1 kafka kafka 10 Dec 4 00:13 00000000099043947579.snapshot
> -rw-rw-r-- 1 kafka kafka 10485756 Dec 4 00:13 00000000099043947579.timeindex
> -rw-rw-r-- 1 kafka kafka 4 Dec 4 00:13 leader-epoch-checkpoint
> {code}
> kafka reports ReplicaFetcherManager.MaxLag.Replica be 99043947579
> !Screen Shot 2018-12-03 at 4.33.35 PM.png|width=720px!
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