Hang Ruan created FLINK-31268:
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Summary: 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
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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