Details
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Bug
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Status: Resolved
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Critical
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Resolution: Fixed
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1.0.3
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None
Description
The following issue was reported by a user:
2016-07-05 01:32:25,113 INFO org.apache.flink.runtime.taskmanager.Task - Freeing task resources for Sink: KafkaOutput (59/72) 2016-07-05 01:32:25,113 INFO org.apache.flink.runtime.taskmanager.Task - Sink: KafkaOutput (53/72) switched to CANCELED 2016-07-05 01:32:25,113 INFO org.apache.flink.runtime.taskmanager.Task - Freeing task resources for Sink: KafkaOutput (53/72) 2016-07-05 01:32:25,144 ERROR akka.actor.OneForOneStrategy - java.util.ConcurrentModificationException at java.util.HashMap$HashIterator.nextNode(HashMap.java:1429) at java.util.HashMap$ValueIterator.next(HashMap.java:1458) at org.apache.kafka.clients.InFlightRequests.inFlightRequestCount(InFlightRequests.java:106) at org.apache.kafka.clients.NetworkClient.inFlightRequestCount(NetworkClient.java:211) at org.apache.kafka.clients.producer.internals.Sender$SenderMetrics$1.measure(Sender.java:383) at org.apache.kafka.common.metrics.KafkaMetric.value(KafkaMetric.java:57) at org.apache.kafka.common.metrics.KafkaMetric.value(KafkaMetric.java:52) at org.apache.flink.streaming.connectors.kafka.internals.metrics.DefaultKafkaMetricAccumulator.writeObject(DefaultKafkaMetricAccumulator.java:152) at sun.reflect.GeneratedMethodAccessor20859.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:497) at java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:988) at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1496) at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1432) at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1178) at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:348) at java.util.HashMap.internalWriteEntries(HashMap.java:1777) at java.util.HashMap.writeObject(HashMap.java:1354) at sun.reflect.GeneratedMethodAccessor42.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:497) at java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:988) at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1496) at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1432) at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1178) at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1548) at java.io.ObjectOutputStream.defaultWriteObject(ObjectOutputStream.java:441) at java.util.Collections$SynchronizedMap.writeObject(Collections.java:2691) at sun.reflect.GeneratedMethodAccessor226.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:497) at java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:988) at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1496) at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1432) at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1178) at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:348) at org.apache.flink.util.InstantiationUtil.serializeObject(InstantiationUtil.java:300) at org.apache.flink.util.SerializedValue.<init>(SerializedValue.java:48) at org.apache.flink.runtime.accumulators.AccumulatorSnapshot.<init>(AccumulatorSnapshot.java:58) at org.apache.flink.runtime.accumulators.AccumulatorRegistry.getSnapshot(AccumulatorRegistry.java:78) at org.apache.flink.runtime.taskmanager.TaskManager.unregisterTaskAndNotifyFinalState(TaskManager.scala:1150) at org.apache.flink.runtime.taskmanager.TaskManager.org$apache$flink$runtime$taskmanager$TaskManager$$handleTaskMessage(TaskManager.scala:407) at org.apache.flink.runtime.taskmanager.TaskManager$$anonfun$handleMessage$1.applyOrElse(TaskManager.scala:265) at scala.runtime.AbstractPartialFunction$mcVL$sp.apply$mcVL$sp(AbstractPartialFunction.scala:33) at scala.runtime.AbstractPartialFunction$mcVL$sp.apply(AbstractPartialFunction.scala:33) at scala.runtime.AbstractPartialFunction$mcVL$sp.apply(AbstractPartialFunction.scala:25) at org.apache.flink.runtime.LeaderSessionMessageFilter$$anonfun$receive$1.applyOrElse(LeaderSessionMessageFilter.scala:44) at scala.runtime.AbstractPartialFunction$mcVL$sp.apply$mcVL$sp(AbstractPartialFunction.scala:33) at scala.runtime.AbstractPartialFunction$mcVL$sp.apply(AbstractPartialFunction.scala:33) at scala.runtime.AbstractPartialFunction$mcVL$sp.apply(AbstractPartialFunction.scala:25) at org.apache.flink.runtime.LogMessages$$anon$1.apply(LogMessages.scala:33) at org.apache.flink.runtime.LogMessages$$anon$1.apply(LogMessages.scala:28) at scala.PartialFunction$class.applyOrElse(PartialFunction.scala:118) at org.apache.flink.runtime.LogMessages$$anon$1.applyOrElse(LogMessages.scala:28) at akka.actor.Actor$class.aroundReceive(Actor.scala:465) at org.apache.flink.runtime.taskmanager.TaskManager.aroundReceive(TaskManager.scala:119) at akka.actor.ActorCell.receiveMessage(ActorCell.scala:516) at akka.actor.ActorCell.invoke(ActorCell.scala:487) at akka.dispatch.Mailbox.processMailbox(Mailbox.scala:254) at akka.dispatch.Mailbox.run(Mailbox.scala:221) at akka.dispatch.Mailbox.exec(Mailbox.scala:231) at scala.concurrent.forkjoin.ForkJoinTask.doExec(ForkJoinTask.java:260) at scala.concurrent.forkjoin.ForkJoinPool$WorkQueue.pollAndExecAll(ForkJoinPool.java:1253) at scala.concurrent.forkjoin.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1346) at scala.concurrent.forkjoin.ForkJoinPool.runWorker(ForkJoinPool.java:1979) at scala.concurrent.forkjoin.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:107)
An immediate workaround is to disable the Kafka metrics by setting "flink.disable-metrics" to "true".
I'll make the metrics serialization more robust by catching and logging the exceptions. Metrics should never cause system failures, or even worse shutdowns.
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