weixiuli opened a new pull request #23393: [SPARK-26288][CORE]add initRegisteredExecutorsDB URL: https://github.com/apache/spark/pull/23393 ## What changes were proposed in this pull request? As we all know that spark on Yarn uses DB to record RegisteredExecutors information which can be reloaded and used again when the ExternalShuffleService is restarted . The RegisteredExecutors information can't be recorded both in the mode of spark's standalone and spark on k8s , which will cause the RegisteredExecutors information to be lost ,when the ExternalShuffleService is restarted. To solve the problem above, a method is proposed and is committed . ## How was this patch tested? new unit tests
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