chummyhe89 opened a new pull request #24556: [SPARK-27641][CORE] Fix MetricsSystem to remove unregistered source correctly URL: https://github.com/apache/spark/pull/24556 ## What changes were proposed in this pull request? * check whether the source is registered before remove it. * return the registered source from `LongAccumulatorSource` and `DoubleAccumulatorSource`'s register method,then we can remove it use `metricsSystem.removeSource` ## How was this patch tested? add new unit tests
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