Jun Rao created KAFKA-4811:
------------------------------

             Summary: ReplicaFetchThread may fail to create due to existing 
metric
                 Key: KAFKA-4811
                 URL: https://issues.apache.org/jira/browse/KAFKA-4811
             Project: Kafka
          Issue Type: Bug
    Affects Versions: 0.10.2.0
            Reporter: Jun Rao


Someone reported the following error.

java.lang.IllegalArgumentException: A metric named 'MetricName 
[name=connection-close-rate, group=replica-fetcher-metrics, 
description=Connections closed per second in the window., tags={broker-id=1, 
fetcher-id=0}]' already exists, can't register another one.
        at 
org.apache.kafka.common.metrics.Metrics.registerMetric(Metrics.java:433)
        at org.apache.kafka.common.metrics.Sensor.add(Sensor.java:249)
        at org.apache.kafka.common.metrics.Sensor.add(Sensor.java:234)
        at 
org.apache.kafka.common.network.Selector$SelectorMetrics.<init>(Selector.java:680)
        at org.apache.kafka.common.network.Selector.<init>(Selector.java:140)
        at 
kafka.server.ReplicaFetcherThread.<init>(ReplicaFetcherThread.scala:86)
        at 
kafka.server.ReplicaFetcherManager.createFetcherThread(ReplicaFetcherManager.scala:35)
        at 
kafka.server.AbstractFetcherManager$$anonfun$addFetcherForPartitions$2.apply(AbstractFetcherManager.scala:83)
        at 
kafka.server.AbstractFetcherManager$$anonfun$addFetcherForPartitions$2.apply(AbstractFetcherManager.scala:78)
        at 
scala.collection.TraversableLike$WithFilter$$anonfun$foreach$1.apply(TraversableLike.scala:772)
        at scala.collection.immutable.Map$Map1.foreach(Map.scala:109)
        at 
scala.collection.TraversableLike$WithFilter.foreach(TraversableLike.scala:771)
        at 
kafka.server.AbstractFetcherManager.addFetcherForPartitions(AbstractFetcherManager.scala:78)
        at kafka.server.ReplicaManager.makeFollowers(ReplicaManager.scala:882)
        at 
kafka.server.ReplicaManager.becomeLeaderOrFollower(ReplicaManager.scala:700)
        at kafka.server.KafkaApis.handleLeaderAndIsrRequest(KafkaApis.scala:148)
        at kafka.server.KafkaApis.handle(KafkaApis.scala:84)
        at kafka.server.KafkaRequestHandler.run(KafkaRequestHandler.scala:62)
        at java.lang.Thread.run(Thread.java:745)




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