Yun Tang created FLINK-25816:
--------------------------------

             Summary: Changelog keyed state backend would come across NPE 
during notification
                 Key: FLINK-25816
                 URL: https://issues.apache.org/jira/browse/FLINK-25816
             Project: Flink
          Issue Type: Bug
          Components: Runtime / Checkpointing, Runtime / State Backends
            Reporter: Yun Tang
            Assignee: Yun Tang
             Fix For: 1.15.0


Instance: 
https://dev.azure.com/apache-flink/apache-flink/_build/results?buildId=30158&view=logs&j=a57e0635-3fad-5b08-57c7-a4142d7d6fa9&t=2ef0effc-1da1-50e5-c2bd-aab434b1c5b7

{code:java}
Caused by: java.lang.NullPointerException
        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)

{code}




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