[jira] [Created] (KAFKA-2530) metrics for old replica fetcher thread need to be deregistered

["Jun Rao (JIRA)" <ji...@apache.org>]

Jun Rao created KAFKA-2530:
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             Summary: 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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