[jira] [Created] (KAFKA-6252) A metric named 'XX' already exists, can't register another one.

["Alexis Sellier (JIRA)" <ji...@apache.org>]

Alexis Sellier created KAFKA-6252:
-------------------------------------

             Summary: A metric named 'XX' already exists, can't register another one.
                 Key: KAFKA-6252
                 URL: https://issues.apache.org/jira/browse/KAFKA-6252
             Project: Kafka
          Issue Type: Bug
          Components: KafkaConnect
    Affects Versions: 1.0.0
         Environment: Linux
            Reporter: Alexis Sellier


When a connector crashes, It cannot be restarted and an exception like this is thrown 


{code:java}
java.lang.IllegalArgumentException: A metric named 'MetricName [name=offset-commit-max-time-ms, group=connector-task-metrics, description=The maximum time in milliseconds taken by this task to commit offsets., tags={connector=hdfs-sink-connector-recover, task=0}]' already exists, can't register another one.
	at org.apache.kafka.common.metrics.Metrics.registerMetric(Metrics.java:532)
	at org.apache.kafka.common.metrics.Sensor.add(Sensor.java:256)
	at org.apache.kafka.common.metrics.Sensor.add(Sensor.java:241)
	at org.apache.kafka.connect.runtime.WorkerTask$TaskMetricsGroup.<init>(WorkerTask.java:328)
	at org.apache.kafka.connect.runtime.WorkerTask.<init>(WorkerTask.java:69)
	at org.apache.kafka.connect.runtime.WorkerSinkTask.<init>(WorkerSinkTask.java:98)
	at org.apache.kafka.connect.runtime.Worker.buildWorkerTask(Worker.java:449)
	at org.apache.kafka.connect.runtime.Worker.startTask(Worker.java:404)
	at org.apache.kafka.connect.runtime.distributed.DistributedHerder.startTask(DistributedHerder.java:852)
	at org.apache.kafka.connect.runtime.distributed.DistributedHerder.access$1600(DistributedHerder.java:108)
	at org.apache.kafka.connect.runtime.distributed.DistributedHerder$13.call(DistributedHerder.java:866)
	at org.apache.kafka.connect.runtime.distributed.DistributedHerder$13.call(DistributedHerder.java:862)
	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
	at java.lang.Thread.run(Thread.java:745)
{code}


I guess it's because the function taskMetricsGroup.close in not call in all the cases



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