bsidhom opened a new pull request #24462: [SPARK-26268][CORE] Do not resubmit 
tasks when executors are lost
URL: https://github.com/apache/spark/pull/24462
 
 
   The DAGScheduler assumes that shuffle data is lost if an executor is lost 
and the Spark external shuffle service is not enabled. However, external 
shuffle managers other than the default external shuffle service can store 
shuffle data outside of the Spark cluster itself. In this case, completed map 
taks are not rerun even if the corresponding executors are lost.
   
   The new `spark.shuffle.external.enabled` property allows this new external 
shuffle behavior to be toggled (independently off the built-in Spark external 
shuffle service).

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