[jira] [Created] (FLINK-22966) NPE in StateAssignmentOperation when rescaling

[Shang Yuanchun (Jira)]

Roman Khachatryan created FLINK-22966:
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             Summary: NPE in StateAssignmentOperation when rescaling
                 Key: FLINK-22966
                 URL: https://issues.apache.org/jira/browse/FLINK-22966
             Project: Flink
          Issue Type: Bug
          Components: Runtime / Checkpointing
    Affects Versions: 1.13.1
            Reporter: Roman Khachatryan
             Fix For: 1.14.0, 1.13.2


[Reported|http://apache-flink-user-mailing-list-archive.2336050.n4.nabble.com/NPE-when-restoring-from-savepoint-in-Flink-1-13-1-application-td44345.html] on user ML.

From the code, it looks like if an operator doesn't have at least one subtask with state , then some variables in StateAssignmentOperation.reAssignSubKeyedStates can be null:
{code}
subManagedKeyedState.isEmpty() && subRawKeyedState.isEmpty()
{code}

{code}
    2021-06-09 13:08:59,849 WARN  org.apache.flink.client.deployment.application.DetachedApplicationRunner [] - Could not execute application:
    org.apache.flink.client.program.ProgramInvocationException: The main method caused an error: Failed to execute job '<censored>'.
            at org.apache.flink.client.program.PackagedProgram.callMainMethod(PackagedProgram.java:372) ~[flink-dist_2.12-1.13.1.jar:1.13.1]
            at org.apache.flink.client.program.PackagedProgram.invokeInteractiveModeForExecution(PackagedProgram.java:222) ~[flink-dist_2.12-1.13.1.jar:1.13.1]
            at org.apache.flink.client.ClientUtils.executeProgram(ClientUtils.java:114) ~[flink-dist_2.12-1.13.1.jar:1.13.1]
            at org.apache.flink.client.deployment.application.DetachedApplicationRunner.tryExecuteJobs(DetachedApplicationRunner.java:84) ~[flink-dist_2.12-1.13.1.jar:1.13.1]
            at org.apache.flink.client.deployment.application.DetachedApplicationRunner.run(DetachedApplicationRunner.java:70) ~[flink-dist_2.12-1.13.1.jar:1.13.1]
            at org.apache.flink.runtime.webmonitor.handlers.JarRunHandler.lambda$handleRequest$0(JarRunHandler.java:102) ~[flink-dist_2.12-1.13.1.jar:1.13.1]
            at java.util.concurrent.CompletableFuture$AsyncSupply.run(CompletableFuture.java:1700) [?:?]
            at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:515) [?:?]
            at java.util.concurrent.FutureTask.run(FutureTask.java:264) [?:?]
            at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:304) [?:?]
            at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128) [?:?]
            at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628) [?:?]
            at java.lang.Thread.run(Thread.java:834) [?:?]
    Caused by: org.apache.flink.util.FlinkException: Failed to execute job '<censored>'.
            at org.apache.flink.streaming.api.environment.StreamExecutionEnvironment.executeAsync(StreamExecutionEnvironment.java:1970) ~[flink-dist_2.12-1.13.1.jar:1.13.1]
            at org.apache.flink.client.program.StreamContextEnvironment.executeAsync(StreamContextEnvironment.java:135) ~[flink-dist_2.12-1.13.1.jar:1.13.1]
            at org.apache.flink.client.program.StreamContextEnvironment.execute(StreamContextEnvironment.java:76) ~[flink-dist_2.12-1.13.1.jar:1.13.1]
            at org.apache.flink.streaming.api.environment.StreamExecutionEnvironment.execute(StreamExecutionEnvironment.java:1834) ~[flink-dist_2.12-1.13.1.jar:1.13.1]
            at org.apache.flink.streaming.api.scala.StreamExecutionEnvironment.execute(StreamExecutionEnvironment.scala:801) ~[flink-dist_2.12-1.13.1.jar:1.13.1]
            at <censored> ~[?:?]
            at <censored> ~[?:?]
            at jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:?]
            at jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:?]
            at jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:?]
            at java.lang.reflect.Method.invoke(Method.java:566) ~[?:?]
            at org.apache.flink.client.program.PackagedProgram.callMainMethod(PackagedProgram.java:355) ~[flink-dist_2.12-1.13.1.jar:1.13.1]
            ... 12 more
    Caused by: java.lang.RuntimeException: org.apache.flink.runtime.client.JobInitializationException: Could not start the JobMaster.
            at org.apache.flink.util.ExceptionUtils.rethrow(ExceptionUtils.java:316) ~[flink-dist_2.12-1.13.1.jar:1.13.1]
            at org.apache.flink.util.function.FunctionUtils.lambda$uncheckedFunction$2(FunctionUtils.java:75) ~[flink-dist_2.12-1.13.1.jar:1.13.1]
            at java.util.concurrent.CompletableFuture$UniApply.tryFire(CompletableFuture.java:642) ~[?:?]
            at java.util.concurrent.CompletableFuture$Completion.run(CompletableFuture.java:478) ~[?:?]
            ... 1 more
    Caused by: org.apache.flink.runtime.client.JobInitializationException: Could not start the JobMaster.
            at org.apache.flink.runtime.jobmaster.DefaultJobMasterServiceProcess.lambda$new$0(DefaultJobMasterServiceProcess.java:97) ~[flink-dist_2.12-1.13.1.jar:1.13.1]
            at java.util.concurrent.CompletableFuture.uniWhenComplete(CompletableFuture.java:859) ~[?:?]
            at java.util.concurrent.CompletableFuture$UniWhenComplete.tryFire(CompletableFuture.java:837) ~[?:?]
            at java.util.concurrent.CompletableFuture.postComplete(CompletableFuture.java:506) ~[?:?]
            at java.util.concurrent.CompletableFuture$AsyncSupply.run(CompletableFuture.java:1705) ~[?:?]
            ... 6 more
    Caused by: java.util.concurrent.CompletionException: java.lang.NullPointerException
            at java.util.concurrent.CompletableFuture.encodeThrowable(CompletableFuture.java:314) ~[?:?]
            at java.util.concurrent.CompletableFuture.completeThrowable(CompletableFuture.java:319) ~[?:?]
            at java.util.concurrent.CompletableFuture$AsyncSupply.run(CompletableFuture.java:1702) ~[?:?]
            ... 6 more
    Caused by: java.lang.NullPointerException
            at org.apache.flink.runtime.checkpoint.StateAssignmentOperation.reAssignSubKeyedStates(StateAssignmentOperation.java:300) ~[flink-dist_2.12-1.13.1.jar:1.13.1]
            at org.apache.flink.runtime.checkpoint.StateAssignmentOperation.lambda$reDistributeKeyedStates$0(StateAssignmentOperation.java:260) ~[flink-dist_2.12-1.13.1.jar:1.13.1]
            at java.util.HashMap.forEach(HashMap.java:1336) ~[?:?]
            at org.apache.flink.runtime.checkpoint.StateAssignmentOperation.reDistributeKeyedStates(StateAssignmentOperation.java:252) ~[flink-dist_2.12-1.13.1.jar:1.13.1]
            at org.apache.flink.runtime.checkpoint.StateAssignmentOperation.assignAttemptState(StateAssignmentOperation.java:196) ~[flink-dist_2.12-1.13.1.jar:1.13.1]
            at org.apache.flink.runtime.checkpoint.StateAssignmentOperation.assignStates(StateAssignmentOperation.java:139) ~[flink-dist_2.12-1.13.1.jar:1.13.1]
            at org.apache.flink.runtime.checkpoint.CheckpointCoordinator.restoreLatestCheckpointedStateInternal(CheckpointCoordinator.java:1562) ~[flink-dist_2.12-1.13.1.jar:1.13.1]
            at org.apache.flink.runtime.checkpoint.CheckpointCoordinator.restoreSavepoint(CheckpointCoordinator.java:1642) ~[flink-dist_2.12-1.13.1.jar:1.13.1]
            at org.apache.flink.runtime.scheduler.DefaultExecutionGraphFactory.tryRestoreExecutionGraphFromSavepoint(DefaultExecutionGraphFactory.java:163) ~[flink-dist_2.12-1.13.1.jar:1.13.1]
            at org.apache.flink.runtime.scheduler.DefaultExecutionGraphFactory.createAndRestoreExecutionGraph(DefaultExecutionGraphFactory.java:138) ~[flink-dist_2.12-1.13.1.jar:1.13.1]
            at org.apache.flink.runtime.scheduler.SchedulerBase.createAndRestoreExecutionGraph(SchedulerBase.java:342) ~[flink-dist_2.12-1.13.1.jar:1.13.1]
            at org.apache.flink.runtime.scheduler.SchedulerBase.<init>(SchedulerBase.java:190) ~[flink-dist_2.12-1.13.1.jar:1.13.1]
            at org.apache.flink.runtime.scheduler.DefaultScheduler.<init>(DefaultScheduler.java:120) ~[flink-dist_2.12-1.13.1.jar:1.13.1]
            at org.apache.flink.runtime.scheduler.DefaultSchedulerFactory.createInstance(DefaultSchedulerFactory.java:132) ~[flink-dist_2.12-1.13.1.jar:1.13.1]
            at org.apache.flink.runtime.jobmaster.DefaultSlotPoolServiceSchedulerFactory.createScheduler(DefaultSlotPoolServiceSchedulerFactory.java:110) ~[flink-dist_2.12-1.13.1.jar:1.13.1]
            at org.apache.flink.runtime.jobmaster.JobMaster.createScheduler(JobMaster.java:340) ~[flink-dist_2.12-1.13.1.jar:1.13.1]
            at org.apache.flink.runtime.jobmaster.JobMaster.<init>(JobMaster.java:317) ~[flink-dist_2.12-1.13.1.jar:1.13.1]
            at org.apache.flink.runtime.jobmaster.factories.DefaultJobMasterServiceFactory.internalCreateJobMasterService(DefaultJobMasterServiceFactory.java:107) ~[flink-dist_2.12-1.13.1.jar:1.13.1]
            at org.apache.flink.runtime.jobmaster.factories.DefaultJobMasterServiceFactory.lambda$createJobMasterService$0(DefaultJobMasterServiceFactory.java:95) ~[flink-dist_2.12-1.13.1.jar:1.13.1]
            at org.apache.flink.util.function.FunctionUtils.lambda$uncheckedSupplier$4(FunctionUtils.java:112) ~[flink-dist_2.12-1.13.1.jar:1.13.1]
            ... 7 more
    2021-06-09 13:08:59,852 ERROR org.apache.flink.runtime.webmonitor.handlers.JarRunHandler   [] - Exception occurred in REST handler: Could not execute application.
{code}




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