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Stephan Ewen commented on FLINK-1930: ------------------------------------- And this is the only exception that you see, it is not a followup exception? > NullPointerException in vertex-centric iteration > ------------------------------------------------ > > Key: FLINK-1930 > URL: https://issues.apache.org/jira/browse/FLINK-1930 > Project: Flink > Issue Type: Bug > Affects Versions: 0.9 > Reporter: Vasia Kalavri > > Hello to my Squirrels, > I came across this exception when having a vertex-centric iteration output > followed by a group by. > I'm not sure if what is causing it, since I saw this error in a rather large > pipeline, but I managed to reproduce it with [this code example | > https://github.com/vasia/flink/commit/1b7bbca1a6130fbcfe98b4b9b43967eb4c61f309] > and a sufficiently large dataset, e.g. [this one | > http://snap.stanford.edu/data/com-DBLP.html] (I'm running this locally). > It seems like a null Buffer in RecordWriter. > The exception message is the following: > Exception in thread "main" > org.apache.flink.runtime.client.JobExecutionException: Job execution failed. > at > org.apache.flink.runtime.jobmanager.JobManager$anonfun$receiveWithLogMessages$1.applyOrElse(JobManager.scala:319) > at > scala.runtime.AbstractPartialFunction$mcVL$sp.apply$mcVL$sp(AbstractPartialFunction.scala:33) > at > scala.runtime.AbstractPartialFunction$mcVL$sp.apply(AbstractPartialFunction.scala:33) > at > scala.runtime.AbstractPartialFunction$mcVL$sp.apply(AbstractPartialFunction.scala:25) > at > org.apache.flink.runtime.ActorLogMessages$anon$1.apply(ActorLogMessages.scala:37) > at > org.apache.flink.runtime.ActorLogMessages$anon$1.apply(ActorLogMessages.scala:30) > at scala.PartialFunction$class.applyOrElse(PartialFunction.scala:118) > at > org.apache.flink.runtime.ActorLogMessages$anon$1.applyOrElse(ActorLogMessages.scala:30) > at akka.actor.Actor$class.aroundReceive(Actor.scala:465) > at > org.apache.flink.runtime.jobmanager.JobManager.aroundReceive(JobManager.scala:94) > 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.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.lang.NullPointerException > at > org.apache.flink.runtime.io.network.api.serialization.SpanningRecordSerializer.setNextBuffer(SpanningRecordSerializer.java:93) > at > org.apache.flink.runtime.io.network.api.writer.RecordWriter.emit(RecordWriter.java:92) > at > org.apache.flink.runtime.operators.shipping.OutputCollector.collect(OutputCollector.java:65) > at > org.apache.flink.runtime.iterative.task.IterationHeadPactTask.streamSolutionSetToFinalOutput(IterationHeadPactTask.java:405) > at > org.apache.flink.runtime.iterative.task.IterationHeadPactTask.run(IterationHeadPactTask.java:365) > at > org.apache.flink.runtime.operators.RegularPactTask.invoke(RegularPactTask.java:360) > at > org.apache.flink.runtime.execution.RuntimeEnvironment.run(RuntimeEnvironment.java:221) > at java.lang.Thread.run(Thread.java:745) -- This message was sent by Atlassian JIRA (v6.3.4#6332)