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https://issues.apache.org/jira/browse/FLINK-29397?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17608298#comment-17608298
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Chesnay Schepler commented on FLINK-29397:
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This is trivially reproducible by disabling the changelog int he StreamTaskTest.
> Race condition in StreamTask can lead to NPE if changelog is disabled
> ---------------------------------------------------------------------
>
> Key: FLINK-29397
> URL: https://issues.apache.org/jira/browse/FLINK-29397
> Project: Flink
> Issue Type: Bug
> Components: Runtime / Task
> Affects Versions: 1.16.0
> Reporter: Chesnay Schepler
> Assignee: Chesnay Schepler
> Priority: Blocker
> Fix For: 1.16.0
>
>
> {{StreamTask#processInput}} contains a branch where the
> changelogWriterAvailabilityProvider is accessed without a null check; this
> field however is nullable in case the changelog is disabled.
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