[jira] [Created] (KAFKA-2250) ConcurrentModificationException in metrics reporting

[Jason Rosenberg (JIRA)]

Jason Rosenberg created KAFKA-2250:
--------------------------------------

             Summary: ConcurrentModificationException in metrics reporting
                 Key: KAFKA-2250
                 URL: https://issues.apache.org/jira/browse/KAFKA-2250
             Project: Kafka
          Issue Type: Bug
            Reporter: Jason Rosenberg


This occurred in a broker log (we're running 0.8.2.1):

{code}
java.util.ConcurrentModificationException
        at java.util.HashMap$HashIterator.nextNode(HashMap.java:1429)
        at java.util.HashMap$KeyIterator.next(HashMap.java:1453)
        at 
java.util.Collections$UnmodifiableCollection$1.next(Collections.java:1042)
        at 
kafka.network.AbstractServerThread.countInterestOps(SocketServer.scala:188)
        at 
kafka.network.SocketServer$$anon$1$$anonfun$value$1.apply(SocketServer.scala:79)
        at 
kafka.network.SocketServer$$anon$1$$anonfun$value$1.apply(SocketServer.scala:79)
        at 
scala.collection.IndexedSeqOptimized$class.foldl(IndexedSeqOptimized.scala:57)
        at 
scala.collection.IndexedSeqOptimized$class.foldLeft(IndexedSeqOptimized.scala:66)
        at scala.collection.mutable.ArrayOps$ofRef.foldLeft(ArrayOps.scala:186)
        at kafka.network.SocketServer$$anon$1.value(SocketServer.scala:79)
        at kafka.network.SocketServer$$anon$1.value(SocketServer.scala:78)
{code}



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