Github user li-zhihui commented on a diff in the pull request:
https://github.com/apache/spark/pull/900#discussion_r14225397
--- Diff:
yarn/stable/src/main/scala/org/apache/spark/deploy/yarn/ApplicationMaster.scala
---
@@ -164,6 +164,7 @@ class ApplicationMaster(args:
ApplicationMasterArguments, conf: Configuration,
private def startUserClass(): Thread = {
logInfo("Starting the user JAR in a separate Thread")
+ System.setProperty("spark.executor.instances",
args.numExecutors.toString)
--- End diff --
It's for yarn-cluster mode.
In yarn-cluster mode, Driver run in yarn container and lost System config
which set in client.
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