[jira] [Created] (KAFKA-3632) ConsumerLag metrics persist after partition migration

["Brian Lueck (JIRA)" <ji...@apache.org>]

Brian Lueck created KAFKA-3632:
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             Summary: ConsumerLag metrics persist after partition migration
                 Key: KAFKA-3632
                 URL: https://issues.apache.org/jira/browse/KAFKA-3632
             Project: Kafka
          Issue Type: Bug
          Components: core
    Affects Versions: 0.9.0.1, 0.8.2.2
         Environment: JDK 1.8, Linux
            Reporter: Brian Lueck
            Priority: Minor


When a partition is migrated away from a broker, the ConsumerLag metric for the topic/partition gets 'stuck' at the current value. The only way to remove the metric is to restart the broker.

This appears to be because in AbstractFetcherThread.scala there is no way of removing a metric. See...

{code}
class FetcherLagStats(metricId: ClientIdAndBroker) { 
private val valueFactory = (k: ClientIdTopicPartition) => new FetcherLagMetrics(k) 
val stats = new Pool[ClientIdTopicPartition, FetcherLagMetrics](Some(valueFactory))

def getFetcherLagStats(topic: String, partitionId: Int): FetcherLagMetrics = { 
stats.getAndMaybePut(new ClientIdTopicPartition(metricId.clientId, topic, partitionId)) 
} 
}
{code}




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