Github user sryza commented on a diff in the pull request:
https://github.com/apache/spark/pull/3806#discussion_r22447830
--- Diff:
yarn/src/main/scala/org/apache/spark/scheduler/cluster/YarnClientSchedulerBackend.scala
---
@@ -70,6 +70,8 @@ private[spark] class YarnClientSchedulerBackend(
List(
("--driver-memory", "SPARK_MASTER_MEMORY", "spark.master.memory"),
("--driver-memory", "SPARK_DRIVER_MEMORY", "spark.driver.memory"),
+ ("--driver-cores", "SPARK_MASTER_CORES", "spark.yarn.am.cores"),
--- End diff --
No need to add in a deprecated SPARK_MASTER_CORES env var.
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