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https://issues.apache.org/jira/browse/FLINK-25816?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17482342#comment-17482342
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Roman Khachatryan commented on FLINK-25816:
-------------------------------------------
I think the bug confirms my previous
[apprehension|https://github.com/apache/flink/pull/18382#discussion_r788780719]
that abortion notification adds risk and complexity while being absolutely not
necessary.
So I'd propose to just remove them (for the nested state backend).
> 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
> Affects Versions: 1.15.0
> Reporter: Yun Tang
> Assignee: Yun Tang
> Priority: Major
> Labels: pull-request-available
> 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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