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https://issues.apache.org/jira/browse/FLINK-31268?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Qingsheng Ren resolved FLINK-31268.
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Resolution: Fixed
> OperatorCoordinator.Context#metricGroup will return null when restore from a
> savepoint
> --------------------------------------------------------------------------------------
>
> Key: FLINK-31268
> URL: https://issues.apache.org/jira/browse/FLINK-31268
> Project: Flink
> Issue Type: Improvement
> Components: Runtime / Metrics
> Reporter: Hang Ruan
> Assignee: Hang Ruan
> Priority: Blocker
> Labels: pull-request-available
> Fix For: 1.18.0
>
>
> The `metricGroup` is initialized lazily in the method
> `OperatorCoordinatorHandler#initializeOperatorCoordinators`.
> This will cause the NullPointerException when we use it in the method like
> `Source#restoreEnumerator`, which will be invoked through
> `SchedulerBase#createAndRestoreExecutionGraph` before
> `OperatorCoordinatorHandler#initializeOperatorCoordinators` in class
> `SchedulerBase#<init>`.
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