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From "Sam Lendle (JIRA)" <j...@apache.org>
Subject [jira] [Created] (KAFKA-7176) State store metrics for migrated tasks are not removed
Date Wed, 18 Jul 2018 01:28:00 GMT
Sam Lendle created KAFKA-7176:

             Summary: State store metrics for migrated tasks are not removed
                 Key: KAFKA-7176
                 URL: https://issues.apache.org/jira/browse/KAFKA-7176
             Project: Kafka
          Issue Type: Bug
          Components: streams
    Affects Versions: 1.1.0
            Reporter: Sam Lendle

I observed that state store metrics for tasks that have been migrated to other instances are
not removed and are still being updated with phantom values, (when viewed for example via
jmx mbeans). 

For all tasks/threads on the same instance (including for migrated tasks), the values of state
store metrics are all (nearly) the same. For the rate metrics at least, the value reported
for each task is the rate I expect for all active tasks on that instance, so things are apparently
being counted multiple times. Presumably, this is how migrated task metrics are being updated.

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