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https://issues.apache.org/jira/browse/KAFKA-2530?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14990953#comment-14990953
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Otis Gospodnetic commented on KAFKA-2530:
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[~junrao] would you consider getting this into 0.9.x if we can provide a patch?
> metrics for old replica fetcher thread need to be deregistered
> --------------------------------------------------------------
>
> Key: KAFKA-2530
> URL: https://issues.apache.org/jira/browse/KAFKA-2530
> Project: Kafka
> Issue Type: Bug
> Components: core
> Affects Versions: 0.8.2.1
> Reporter: Jun Rao
>
> Currently, the lag metrics in the replica fetcher has the following format
> where the leader broker id is included in the clientId tag.
> clientId="ReplicaFetcherThread-0-101",partition="0",topic="test",mbean_property_type="FetcherLagMetrics",Value="262"
> There are a couple of issues. (1) When the replica changes from a follower to
> a leader, we will need to set the lag to 0 or deregister the metric. (2)
> Similarly, when the follower switch to another leader, we should deregister
> the metric or clear the value. Also, we probably should remove the leader
> broker id from the clientId tag. That way, the metric name doesn't change
> when the follower switches leaders.
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