GroupByKeyTest$WindowTests.testWindowFnInvalidation breaks on Flink runner in batch mode
Open
bug
flink
P3
runners
- Dominant language
- Java
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Description
```
java.lang.NullPointerException
:
(No message provided)
Close stacktrace
at org.apache.beam.runners.core.metrics.MetricsContainerStepMap.asMetricResults(MetricsContainerStepMap.java:129)
at
org.apache.beam.runners.core.metrics.MetricsContainerStepMap.asAttemptedOnlyMetricResults(MetricsContainerStepMap.java:113)
at
org.apache.beam.runners.flink.FlinkRunnerResult.metrics(FlinkRunnerResult.java:76)
```
Imported from Jira [BEAM-7324](https://issues.apache.org/jira/browse/BEAM-7324). Original Jira may contain additional context.
Reported by: iemejia.
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