chummyhe89 opened a new pull request #26984: [SPARK-27641][CORE] Fix MetricsSystem to remove metrics of the specif… URL: https://github.com/apache/spark/pull/26984 ## 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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