Robert Metzger created FLINK-4157:
-------------------------------------
Summary: FlinkKafkaMetrics cause TaskManager shutdown during
cancellation
Key: FLINK-4157
URL: https://issues.apache.org/jira/browse/FLINK-4157
Project: Flink
Issue Type: Bug
Components: Kafka Connector
Affects Versions: 1.0.3
Reporter: Robert Metzger
Assignee: Robert Metzger
Priority: Critical
Fix For: 1.1.0
The following issue was reported by a user:
{code}
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)
{code}
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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