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https://issues.apache.org/jira/browse/FLINK-9258?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16486911#comment-16486911
]
ASF GitHub Bot commented on FLINK-9258:
---------------------------------------
Github user StefanRRichter commented on the issue:
https://github.com/apache/flink/pull/5959
I have two quick questions:
- Why does `ComponentMetricGroup` even override the method
`getAllVariables` from `AbstractMetricGroup` with essentially the exact same
code?
-Why is it only fixed in `ComponentMetricGroup`? Could it make sense to fix
it in `AbstractMetricGroup` and remove the overriding method in the subclass?
> ConcurrentModificationException in ComponentMetricGroup.getAllVariables
> -----------------------------------------------------------------------
>
> Key: FLINK-9258
> URL: https://issues.apache.org/jira/browse/FLINK-9258
> Project: Flink
> Issue Type: Bug
> Components: Metrics
> Affects Versions: 1.4.2
> Reporter: Narayanan Arunachalam
> Assignee: Chesnay Schepler
> Priority: Major
> Fix For: 1.5.0, 1.4.3
>
>
> Seeing this exception at the job startup time. Looks like there is a race
> condition when the metrics variables are constructed.
> The error is intermittent.
> Exception in thread "main"
> org.apache.flink.runtime.client.JobExecutionException: Job execution failed.
> at
> org.apache.flink.runtime.jobmanager.JobManager$$anonfun$handleMessage$1$$anonfun$applyOrElse$6.apply$mcV$sp(JobManager.scala:897)
> at
> org.apache.flink.runtime.jobmanager.JobManager$$anonfun$handleMessage$1$$anonfun$applyOrElse$6.apply(JobManager.scala:840)
> at
> org.apache.flink.runtime.jobmanager.JobManager$$anonfun$handleMessage$1$$anonfun$applyOrElse$6.apply(JobManager.scala:840)
> at
> scala.concurrent.impl.Future$PromiseCompletingRunnable.liftedTree1$1(Future.scala:24)
> at
> scala.concurrent.impl.Future$PromiseCompletingRunnable.run(Future.scala:24)
> at akka.dispatch.TaskInvocation.run(AbstractDispatcher.scala:39)
> at
> akka.dispatch.ForkJoinExecutorConfigurator$AkkaForkJoinTask.exec(AbstractDispatcher.scala:415)
> at
> scala.concurrent.forkjoin.ForkJoinTask.doExec(ForkJoinTask.java:260)
> at
> scala.concurrent.forkjoin.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1339)
> at
> scala.concurrent.forkjoin.ForkJoinPool.runWorker(ForkJoinPool.java:1979)
> at
> scala.concurrent.forkjoin.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:107)
> Caused by: java.util.ConcurrentModificationException
> at java.util.HashMap$HashIterator.nextNode(HashMap.java:1437)
> at java.util.HashMap$EntryIterator.next(HashMap.java:1471)
> at java.util.HashMap$EntryIterator.next(HashMap.java:1469)
> at java.util.HashMap.putMapEntries(HashMap.java:511)
> at java.util.HashMap.putAll(HashMap.java:784)
> at
> org.apache.flink.runtime.metrics.groups.ComponentMetricGroup.getAllVariables(ComponentMetricGroup.java:63)
> at
> org.apache.flink.runtime.metrics.groups.ComponentMetricGroup.getAllVariables(ComponentMetricGroup.java:63)
> at
> com.netflix.spaas.metrics.MetricsReporterRegistry.getTags(MetricsReporterRegistry.java:147)
> at
> com.netflix.spaas.metrics.MetricsReporterRegistry.mergeWithSourceAndSinkTags(MetricsReporterRegistry.java:170)
> at
> com.netflix.spaas.metrics.MetricsReporterRegistry.addReporter(MetricsReporterRegistry.java:75)
> at
> com.netflix.spaas.nfflink.connector.kafka.source.Kafka010Consumer.createFetcher(Kafka010Consumer.java:69)
> at
> org.apache.flink.streaming.connectors.kafka.FlinkKafkaConsumerBase.run(FlinkKafkaConsumerBase.java:549)
> at
> org.apache.flink.streaming.api.operators.StreamSource.run(StreamSource.java:86)
> at
> org.apache.flink.streaming.api.operators.StreamSource.run(StreamSource.java:55)
> at
> org.apache.flink.streaming.runtime.tasks.SourceStreamTask.run(SourceStreamTask.java:94)
> at
> org.apache.flink.streaming.runtime.tasks.StreamTask.invoke(StreamTask.java:264)
> at org.apache.flink.runtime.taskmanager.Task.run(Task.java:718)
> at java.lang.Thread.run(Thread.java:748)
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