NullPointerException in RescalingITCase.testSavepointRescalingOutKeyedState

12:17:36,702 [AsyncOperations-thread-1] INFO  org.apache.flink.streaming.runtime.tasks.AsyncCheckpointRunnable [] - Flat Map -> Sink: Unnamed (4/4)#0 - asynchronous part of checkpoint 5 could not be completed.
java.util.concurrent.ExecutionException: org.apache.flink.runtime.checkpoint.CheckpointException: Checkpoint was canceled because a barrier from newer checkpoint was received.
        at java.util.concurrent.CompletableFuture.reportGet(CompletableFuture.java:357) ~[?:1.8.0_292]
        at java.util.concurrent.CompletableFuture.get(CompletableFuture.java:1908) ~[?:1.8.0_292]
        at org.apache.flink.streaming.api.operators.OperatorSnapshotFinalizer.<init>(OperatorSnapshotFinalizer.java:69) ~[flink-streaming-java-1.15-SNAPSHOT.jar:1.15-SNAPSHOT]
        at org.apache.flink.streaming.runtime.tasks.AsyncCheckpointRunnable.finalizeNonFinishedSnapshots(AsyncCheckpointRunnable.java:191) ~[flink-streaming-java-1.15-SNAPSHOT.jar:1.15-SNAPSHOT]
        at org.apache.flink.streaming.runtime.tasks.AsyncCheckpointRunnable.run(AsyncCheckpointRunnable.java:124) [flink-streaming-java-1.15-SNAPSHOT.jar:1.15-SNAPSHOT]
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) [?:1.8.0_292]
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) [?:1.8.0_292]
        at java.lang.Thread.run(Thread.java:748) [?:1.8.0_292]
Caused by: org.apache.flink.runtime.checkpoint.CheckpointException: Checkpoint was canceled because a barrier from newer checkpoint was received.
        at org.apache.flink.streaming.runtime.io.checkpointing.SingleCheckpointBarrierHandler.abortInternal(SingleCheckpointBarrierHandler.java:376) ~[flink-streaming-java-1.15-SNAPSHOT.jar:1.15-SNAPSHOT]
        at org.apache.flink.streaming.runtime.io.checkpointing.SingleCheckpointBarrierHandler.cancelSubsumedCheckpoint(SingleCheckpointBarrierHandler.java:463) ~[flink-streaming-java-1.15-SNAPSHOT.jar:1.15-SNAPSHOT]
        at org.apache.flink.streaming.runtime.io.checkpointing.SingleCheckpointBarrierHandler.checkNewCheckpoint(SingleCheckpointBarrierHandler.java:347) ~[flink-streaming-java-1.15-SNAPSHOT.jar:1.15-SNAPSHOT]
        at org.apache.flink.streaming.runtime.io.checkpointing.SingleCheckpointBarrierHandler.processBarrier(SingleCheckpointBarrierHandler.java:228) ~[flink-streaming-java-1.15-SNAPSHOT.jar:1.15-SNAPSHOT]
        at org.apache.flink.streaming.runtime.io.checkpointing.CheckpointedInputGate.handleEvent(CheckpointedInputGate.java:181) ~[flink-streaming-java-1.15-SNAPSHOT.jar:1.15-SNAPSHOT]
        at org.apache.flink.streaming.runtime.io.checkpointing.CheckpointedInputGate.pollNext(CheckpointedInputGate.java:159) ~[flink-streaming-java-1.15-SNAPSHOT.jar:1.15-SNAPSHOT]
        at org.apache.flink.streaming.runtime.io.checkpointing.CheckpointedInputGate.processPriorityEvents(CheckpointedInputGate.java:112) ~[flink-streaming-java-1.15-SNAPSHOT.jar:1.15-SNAPSHOT]
        at org.apache.flink.streaming.runtime.tasks.StreamTaskActionExecutor$1.runThrowing(StreamTaskActionExecutor.java:50) ~[flink-streaming-java-1.15-SNAPSHOT.jar:1.15-SNAPSHOT]
        at org.apache.flink.streaming.runtime.tasks.mailbox.Mail.run(Mail.java:90) ~[flink-streaming-java-1.15-SNAPSHOT.jar:1.15-SNAPSHOT]
        at org.apache.flink.streaming.runtime.tasks.mailbox.MailboxProcessor.processMailsNonBlocking(MailboxProcessor.java:353) ~[flink-streaming-java-1.15-SNAPSHOT.jar:1.15-SNAPSHOT]
        at org.apache.flink.streaming.runtime.tasks.mailbox.MailboxProcessor.processMail(MailboxProcessor.java:317) ~[flink-streaming-java-1.15-SNAPSHOT.jar:1.15-SNAPSHOT]
        at org.apache.flink.streaming.runtime.tasks.mailbox.MailboxProcessor.runMailboxLoop(MailboxProcessor.java:201) ~[flink-streaming-java-1.15-SNAPSHOT.jar:1.15-SNAPSHOT]
        at org.apache.flink.streaming.runtime.tasks.StreamTask.runMailboxLoop(StreamTask.java:802) ~[flink-streaming-java-1.15-SNAPSHOT.jar:1.15-SNAPSHOT]
        at org.apache.flink.streaming.runtime.tasks.StreamTask.invoke(StreamTask.java:751) ~[flink-streaming-java-1.15-SNAPSHOT.jar:1.15-SNAPSHOT]
        at org.apache.flink.runtime.taskmanager.Task.runWithSystemExitMonitoring(Task.java:948) ~[flink-runtime-1.15-SNAPSHOT.jar:1.15-SNAPSHOT]
        at org.apache.flink.runtime.taskmanager.Task.restoreAndInvoke(Task.java:927) ~[flink-runtime-1.15-SNAPSHOT.jar:1.15-SNAPSHOT]
        at org.apache.flink.runtime.taskmanager.Task.doRun(Task.java:741) ~[flink-runtime-1.15-SNAPSHOT.jar:1.15-SNAPSHOT]
        at org.apache.flink.runtime.taskmanager.Task.run(Task.java:563) ~[flink-runtime-1.15-SNAPSHOT.jar:1.15-SNAPSHOT]
        ... 1 more
12:17:36,707 [Flat Map -> Sink: Unnamed (1/4)#0] INFO  org.apache.flink.state.changelog.ChangelogKeyedStateBackend  [] - snapshot of Flat Map -> Sink: Unnamed (1/4)#0 for checkpoint 6, change range: 0..13306
12:17:36,710 [Flat Map -> Sink: Unnamed (4/4)#0] INFO  org.apache.flink.state.changelog.ChangelogKeyedStateBackend  [] - snapshot of Flat Map -> Sink: Unnamed (4/4)#0 for checkpoint 6, change range: 0..9002
12:17:36,720 [Flat Map -> Sink: Unnamed (4/4)#0] INFO  org.apache.flink.state.changelog.PeriodicMaterializationManager [] - Shutting down PeriodicMaterializationManager.
12:17:36,720 [AsyncOperations-thread-1] INFO  org.apache.flink.streaming.runtime.tasks.AsyncCheckpointRunnable [] - Flat Map -> Sink: Unnamed (4/4)#0 - asynchronous part of checkpoint 6 could not be completed.
java.util.concurrent.CancellationException: null
        at java.util.concurrent.CompletableFuture.cancel(CompletableFuture.java:2276) ~[?:1.8.0_292]
        at org.apache.flink.runtime.state.StateUtil.discardStateFuture(StateUtil.java:78) ~[flink-runtime-1.15-SNAPSHOT.jar:1.15-SNAPSHOT]
        at org.apache.flink.streaming.api.operators.OperatorSnapshotFutures.lambda$cancel$0(OperatorSnapshotFutures.java:173) ~[flink-streaming-java-1.15-SNAPSHOT.jar:1.15-SNAPSHOT]
        at org.apache.flink.shaded.guava30.com.google.common.io.Closer.close(Closer.java:213) ~[flink-shaded-guava-30.1.1-jre-14.0.jar:30.1.1-jre-14.0]
        at org.apache.flink.streaming.api.operators.OperatorSnapshotFutures.cancel(OperatorSnapshotFutures.java:185) ~[flink-streaming-java-1.15-SNAPSHOT.jar:1.15-SNAPSHOT]
        at org.apache.flink.streaming.runtime.tasks.AsyncCheckpointRunnable.cleanup(AsyncCheckpointRunnable.java:391) ~[flink-streaming-java-1.15-SNAPSHOT.jar:1.15-SNAPSHOT]
        at org.apache.flink.streaming.runtime.tasks.AsyncCheckpointRunnable.close(AsyncCheckpointRunnable.java:356) ~[flink-streaming-java-1.15-SNAPSHOT.jar:1.15-SNAPSHOT]
        at org.apache.flink.util.IOUtils.closeQuietly(IOUtils.java:294) ~[flink-core-1.15-SNAPSHOT.jar:1.15-SNAPSHOT]
        at org.apache.flink.util.IOUtils.closeAllQuietly(IOUtils.java:281) ~[flink-core-1.15-SNAPSHOT.jar:1.15-SNAPSHOT]
        at org.apache.flink.streaming.runtime.tasks.SubtaskCheckpointCoordinatorImpl.close(SubtaskCheckpointCoordinatorImpl.java:480) ~[flink-streaming-java-1.15-SNAPSHOT.jar:1.15-SNAPSHOT]
        at org.apache.flink.util.IOUtils.closeQuietly(IOUtils.java:294) ~[flink-core-1.15-SNAPSHOT.jar:1.15-SNAPSHOT]
        at org.apache.flink.util.IOUtils.closeAllQuietly(IOUtils.java:281) ~[flink-core-1.15-SNAPSHOT.jar:1.15-SNAPSHOT]
        at org.apache.flink.core.fs.CloseableRegistry.doClose(CloseableRegistry.java:74) ~[flink-core-1.15-SNAPSHOT.jar:1.15-SNAPSHOT]
        at org.apache.flink.util.AbstractAutoCloseableRegistry.close(AbstractAutoCloseableRegistry.java:127) ~[flink-core-1.15-SNAPSHOT.jar:1.15-SNAPSHOT]
        at org.apache.flink.util.IOUtils.closeAll(IOUtils.java:254) ~[flink-core-1.15-SNAPSHOT.jar:1.15-SNAPSHOT]
        at org.apache.flink.core.fs.AutoCloseableRegistry.doClose(AutoCloseableRegistry.java:72) ~[flink-core-1.15-SNAPSHOT.jar:1.15-SNAPSHOT]
        at org.apache.flink.util.AbstractAutoCloseableRegistry.close(AbstractAutoCloseableRegistry.java:127) ~[flink-core-1.15-SNAPSHOT.jar:1.15-SNAPSHOT]
        at org.apache.flink.streaming.runtime.tasks.StreamTask.cleanUp(StreamTask.java:914) ~[flink-streaming-java-1.15-SNAPSHOT.jar:1.15-SNAPSHOT]
        at org.apache.flink.runtime.taskmanager.Task.lambda$restoreAndInvoke$0(Task.java:930) ~[flink-runtime-1.15-SNAPSHOT.jar:1.15-SNAPSHOT]
        at org.apache.flink.runtime.taskmanager.Task.runWithSystemExitMonitoring(Task.java:948) ~[flink-runtime-1.15-SNAPSHOT.jar:1.15-SNAPSHOT]
        at org.apache.flink.runtime.taskmanager.Task.restoreAndInvoke(Task.java:930) ~[flink-runtime-1.15-SNAPSHOT.jar:1.15-SNAPSHOT]
        at org.apache.flink.runtime.taskmanager.Task.doRun(Task.java:741) ~[flink-runtime-1.15-SNAPSHOT.jar:1.15-SNAPSHOT]
        at org.apache.flink.runtime.taskmanager.Task.run(Task.java:563) ~[flink-runtime-1.15-SNAPSHOT.jar:1.15-SNAPSHOT]
        at java.lang.Thread.run(Thread.java:748) [?:1.8.0_292]
12:17:36,722 [Channel state writer Flat Map -> Sink: Unnamed (4/4)#0] INFO  org.apache.flink.runtime.checkpoint.channel.ChannelStateWriteRequestExecutorImpl [] - Flat Map -> Sink: Unnamed (4/4)#0 discarding 0 drained requests
12:17:36,722 [Flat Map -> Sink: Unnamed (4/4)#0] INFO  org.apache.flink.runtime.checkpoint.channel.ChannelStateWriteRequestExecutorImpl [] - Flat Map -> Sink: Unnamed (4/4)#0 discarding 1 drained requests
12:17:36,723 [Flat Map -> Sink: Unnamed (4/4)#0] WARN  org.apache.flink.runtime.taskmanager.Task                    [] - Flat Map -> Sink: Unnamed (4/4)#0 (185244134ae888669016a5f2b4282d26) switched from RUNNING to FAILED with failure cause: java.lang.Nu
llPointerException
        at org.apache.flink.state.changelog.ChangelogKeyedStateBackend.notifyCheckpointAborted(ChangelogKeyedStateBackend.java:536)
        at org.apache.flink.streaming.api.operators.StreamOperatorStateHandler.notifyCheckpointAborted(StreamOperatorStateHandler.java:298)
        at org.apache.flink.streaming.api.operators.AbstractStreamOperator.notifyCheckpointAborted(AbstractStreamOperator.java:383)
        at org.apache.flink.streaming.api.operators.AbstractUdfStreamOperator.notifyCheckpointAborted(AbstractUdfStreamOperator.java:132)
        at org.apache.flink.streaming.runtime.tasks.RegularOperatorChain.notifyCheckpointAborted(RegularOperatorChain.java:158)
        at org.apache.flink.streaming.runtime.tasks.SubtaskCheckpointCoordinatorImpl.notifyCheckpoint(SubtaskCheckpointCoordinatorImpl.java:406)
        at org.apache.flink.streaming.runtime.tasks.SubtaskCheckpointCoordinatorImpl.notifyCheckpointAborted(SubtaskCheckpointCoordinatorImpl.java:352)
        at org.apache.flink.streaming.runtime.tasks.StreamTask.lambda$notifyCheckpointAbortAsync$15(StreamTask.java:1327)
        at org.apache.flink.streaming.runtime.tasks.StreamTask.lambda$notifyCheckpointOperation$17(StreamTask.java:1350)
        at org.apache.flink.streaming.runtime.tasks.StreamTaskActionExecutor$1.runThrowing(StreamTaskActionExecutor.java:50)
        at org.apache.flink.streaming.runtime.tasks.mailbox.Mail.run(Mail.java:90)
        at org.apache.flink.streaming.runtime.tasks.mailbox.MailboxProcessor.processMailsNonBlocking(MailboxProcessor.java:353)
        at org.apache.flink.streaming.runtime.tasks.mailbox.MailboxProcessor.processMail(MailboxProcessor.java:317)
        at org.apache.flink.streaming.runtime.tasks.mailbox.MailboxProcessor.runMailboxLoop(MailboxProcessor.java:201)
        at org.apache.flink.streaming.runtime.tasks.StreamTask.runMailboxLoop(StreamTask.java:802)
        at org.apache.flink.streaming.runtime.tasks.StreamTask.invoke(StreamTask.java:751)
        at org.apache.flink.runtime.taskmanager.Task.runWithSystemExitMonitoring(Task.java:948)
        at org.apache.flink.runtime.taskmanager.Task.restoreAndInvoke(Task.java:927)
        at org.apache.flink.runtime.taskmanager.Task.doRun(Task.java:741)
        at org.apache.flink.runtime.taskmanager.Task.run(Task.java:563)
        at java.lang.Thread.run(Thread.java:748)12:17:36,723 [Flat Map -> Sink: Unnamed (4/4)#0] INFO  org.apache.flink.runtime.taskmanager.Task                    [] - Freeing task resources for Flat Map -> Sink: Unnamed (4/4)#0 (185244134ae888669016a5f2b4282d26).
12:17:36,727 [flink-akka.actor.default-dispatcher-8] INFO  org.apache.flink.runtime.taskexecutor.TaskExecutor           [] - Un-registering task and sending final execution state FAILED to JobManager for task Flat Map -> Sink: Unnamed (4/4)#0 185244134ae
888669016a5f2b4282d26.
12:17:36,728 [flink-akka.actor.default-dispatcher-8] INFO  org.apache.flink.runtime.executiongraph.ExecutionGraph       [] - Flat Map -> Sink: Unnamed (4/4) (185244134ae888669016a5f2b4282d26) switched from RUNNING to FAILED on 04d463f4-6c87-415e-b8ad-dd4
20195d7cf @ localhost (dataPort=40473).
java.lang.NullPointerException: null
        at org.apache.flink.state.changelog.ChangelogKeyedStateBackend.notifyCheckpointAborted(ChangelogKeyedStateBackend.java:536) ~[flink-statebackend-changelog-1.15-SNAPSHOT.jar:1.15-SNAPSHOT]
        at org.apache.flink.streaming.api.operators.StreamOperatorStateHandler.notifyCheckpointAborted(StreamOperatorStateHandler.java:298) ~[flink-streaming-java-1.15-SNAPSHOT.jar:1.15-SNAPSHOT]
        at org.apache.flink.streaming.api.operators.AbstractStreamOperator.notifyCheckpointAborted(AbstractStreamOperator.java:383) ~[flink-streaming-java-1.15-SNAPSHOT.jar:1.15-SNAPSHOT]
        at org.apache.flink.streaming.api.operators.AbstractUdfStreamOperator.notifyCheckpointAborted(AbstractUdfStreamOperator.java:132) ~[flink-streaming-java-1.15-SNAPSHOT.jar:1.15-SNAPSHOT]
        at org.apache.flink.streaming.runtime.tasks.RegularOperatorChain.notifyCheckpointAborted(RegularOperatorChain.java:158) ~[flink-streaming-java-1.15-SNAPSHOT.jar:1.15-SNAPSHOT]
        at org.apache.flink.streaming.runtime.tasks.SubtaskCheckpointCoordinatorImpl.notifyCheckpoint(SubtaskCheckpointCoordinatorImpl.java:406) ~[flink-streaming-java-1.15-SNAPSHOT.jar:1.15-SNAPSHOT]
        at org.apache.flink.streaming.runtime.tasks.SubtaskCheckpointCoordinatorImpl.notifyCheckpointAborted(SubtaskCheckpointCoordinatorImpl.java:352) ~[flink-streaming-java-1.15-SNAPSHOT.jar:1.15-SNAPSHOT]
        at org.apache.flink.streaming.runtime.tasks.StreamTask.lambda$notifyCheckpointAbortAsync$15(StreamTask.java:1327) ~[flink-streaming-java-1.15-SNAPSHOT.jar:1.15-SNAPSHOT]
        at org.apache.flink.streaming.runtime.tasks.StreamTask.lambda$notifyCheckpointOperation$17(StreamTask.java:1350) ~[flink-streaming-java-1.15-SNAPSHOT.jar:1.15-SNAPSHOT]
        at org.apache.flink.streaming.runtime.tasks.StreamTaskActionExecutor$1.runThrowing(StreamTaskActionExecutor.java:50) ~[flink-streaming-java-1.15-SNAPSHOT.jar:1.15-SNAPSHOT]
        at org.apache.flink.streaming.runtime.tasks.mailbox.Mail.run(Mail.java:90) ~[flink-streaming-java-1.15-SNAPSHOT.jar:1.15-SNAPSHOT]
        at org.apache.flink.streaming.runtime.tasks.mailbox.MailboxProcessor.processMailsNonBlocking(MailboxProcessor.java:353) ~[flink-streaming-java-1.15-SNAPSHOT.jar:1.15-SNAPSHOT]
        at org.apache.flink.streaming.runtime.tasks.mailbox.MailboxProcessor.processMail(MailboxProcessor.java:317) ~[flink-streaming-java-1.15-SNAPSHOT.jar:1.15-SNAPSHOT]
        at org.apache.flink.streaming.runtime.tasks.mailbox.MailboxProcessor.runMailboxLoop(MailboxProcessor.java:201) ~[flink-streaming-java-1.15-SNAPSHOT.jar:1.15-SNAPSHOT]
        at org.apache.flink.streaming.runtime.tasks.StreamTask.runMailboxLoop(StreamTask.java:802) ~[flink-streaming-java-1.15-SNAPSHOT.jar:1.15-SNAPSHOT]
        at org.apache.flink.streaming.runtime.tasks.StreamTask.invoke(StreamTask.java:751) ~[flink-streaming-java-1.15-SNAPSHOT.jar:1.15-SNAPSHOT]
        at org.apache.flink.runtime.taskmanager.Task.runWithSystemExitMonitoring(Task.java:948) ~[flink-runtime-1.15-SNAPSHOT.jar:1.15-SNAPSHOT]
        at org.apache.flink.runtime.taskmanager.Task.restoreAndInvoke(Task.java:927) ~[flink-runtime-1.15-SNAPSHOT.jar:1.15-SNAPSHOT]
        at org.apache.flink.runtime.taskmanager.Task.doRun(Task.java:741) ~[flink-runtime-1.15-SNAPSHOT.jar:1.15-SNAPSHOT]
        at org.apache.flink.runtime.taskmanager.Task.run(Task.java:563) ~[flink-runtime-1.15-SNAPSHOT.jar:1.15-SNAPSHOT]
        at java.lang.Thread.run(Thread.java:748) ~[?:1.8.0_292]