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From "lamber-ken (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (FLINK-12247) fix NPE when writing an archive file to a FileSystem
Date Fri, 19 Apr 2019 09:40:00 GMT

     [ https://issues.apache.org/jira/browse/FLINK-12247?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

lamber-ken updated FLINK-12247:
-------------------------------
    Attachment: fix-nep.patch

> fix NPE when writing an archive file to a FileSystem
> ----------------------------------------------------
>
>                 Key: FLINK-12247
>                 URL: https://issues.apache.org/jira/browse/FLINK-12247
>             Project: Flink
>          Issue Type: Bug
>          Components: Deployment / YARN
>    Affects Versions: 1.6.3, 1.8.0
>            Reporter: lamber-ken
>            Assignee: lamber-ken
>            Priority: Major
>             Fix For: 1.9.0
>
>         Attachments: fix-nep.patch
>
>
> h3. *Issue detail info*
> In our hadoop product env, we use fixed-delay restart-strategy.
> {code:java}
> restart-strategy: fixed-delay
> restart-strategy.fixed-delay.attempts: 20
> restart-strategy.fixed-delay.delay: 2 s
> {code}
> if a flink-job reaches the max attempt count, the flink job will write an archive file
to +FileSystem+ and shut down.
> but when +SubtaskExecutionAttemptDetailsHandler+ handle the detail attempt info of subtask,
met NEP.
> h3. *Detailed reasons are as follows:*
> 0. Assume a scenario, a flink job {color:#ff0000}reaches the max attempt count, ( 20
){color}
> 1. +ExecutionVertex+ is a parallel subtask of the execution. Each +ExecutionVertex+ was
created with {color:#660e7a}MAX_ATTEMPTS_HISTORY_SIZE( default value: 16 ).{color}
> 2. when +SubtaskExecutionAttemptDetailsHandler+ hand will get the attempt from ++priorExecutions,
>    but priorExecutions just retained {color:#660e7a}MAX_ATTEMPTS_HISTORY_SIZE{color}
elemets, so some element
>    was dropped from the head of the list(FIFO). so may return null.
> h3. *Detailed StackTrace*
> {code:java}
> java.lang.NullPointerException
>    at org.apache.flink.runtime.rest.handler.util.MutableIOMetrics.addIOMetrics(MutableIOMetrics.java:88)
>    at org.apache.flink.runtime.rest.handler.job.SubtaskExecutionAttemptDetailsHandler.createDetailsInfo(SubtaskExecutionAttemptDetailsHandler.java:140)
>    at org.apache.flink.runtime.rest.handler.job.SubtaskExecutionAttemptDetailsHandler.archiveJsonWithPath(SubtaskExecutionAttemptDetailsHandler.java:120)
>    at org.apache.flink.runtime.webmonitor.WebMonitorEndpoint.archiveJsonWithPath(WebMonitorEndpoint.java:780)
>    at org.apache.flink.runtime.dispatcher.JsonResponseHistoryServerArchivist.archiveExecutionGraph(JsonResponseHistoryServerArchivist.java:57)
>    at org.apache.flink.runtime.dispatcher.Dispatcher.archiveExecutionGraph(Dispatcher.java:758)
>    at org.apache.flink.runtime.dispatcher.Dispatcher.jobReachedGloballyTerminalState(Dispatcher.java:730)
>    at org.apache.flink.runtime.dispatcher.MiniDispatcher.jobReachedGloballyTerminalState(MiniDispatcher.java:138)
>    at org.apache.flink.runtime.dispatcher.Dispatcher.lambda$startJobManagerRunner$6(Dispatcher.java:341)
>    at java.util.concurrent.CompletableFuture.uniWhenComplete(CompletableFuture.java:760)
>    at java.util.concurrent.CompletableFuture$UniWhenComplete.tryFire(CompletableFuture.java:736)
>    at java.util.concurrent.CompletableFuture$Completion.run(CompletableFuture.java:442)
>    at org.apache.flink.runtime.rpc.akka.AkkaRpcActor.handleRunAsync(AkkaRpcActor.java:332)
>    at org.apache.flink.runtime.rpc.akka.AkkaRpcActor.handleRpcMessage(AkkaRpcActor.java:158)
>    at org.apache.flink.runtime.rpc.akka.FencedAkkaRpcActor.handleRpcMessage(FencedAkkaRpcActor.java:70)
>    at org.apache.flink.runtime.rpc.akka.AkkaRpcActor.onReceive(AkkaRpcActor.java:142)
>    at org.apache.flink.runtime.rpc.akka.FencedAkkaRpcActor.onReceive(FencedAkkaRpcActor.java:40)
>    at akka.actor.UntypedActor$$anonfun$receive$1.applyOrElse(UntypedActor.scala:165)
>    at akka.actor.Actor$class.aroundReceive(Actor.scala:502)
>    at akka.actor.UntypedActor.aroundReceive(UntypedActor.scala:95)
>    at akka.actor.ActorCell.receiveMessage(ActorCell.scala:526)
>    at akka.actor.ActorCell.invoke(ActorCell.scala:495)
>    at akka.dispatch.Mailbox.processMailbox(Mailbox.scala:257)
>    at akka.dispatch.Mailbox.run(Mailbox.scala:224)
>    at akka.dispatch.Mailbox.exec(Mailbox.scala:234)
>    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)
> {code}
> h3. *Minimal reproducible example*
> {code:java}
> public static void main(String[] args) throws Exception {
>     StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment();
>     DataStream<String> text = env.addSource(new SourceFunction<String>()
{
>         @Override
>         public void run(SourceContext<String> ctx) throws Exception {
>             while (true) {
>                 ctx.collect("aaaa");
>                 Thread.sleep(100);
>             }
>         }
>         @Override
>         public void cancel() {
>         }
>     });
>     text.addSink(new SinkFunction<String>() {
>         @Override
>         public void invoke(String value, Context context) throws Exception {
>             System.out.println(1 / 0);
>         }
>     });
>     env.execute();
> }
> {code}
>  



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