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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