Github user vanzin commented on a diff in the pull request:
https://github.com/apache/spark/pull/7657#discussion_r36487340
--- Diff: yarn/src/main/scala/org/apache/spark/deploy/yarn/Client.scala ---
@@ -958,6 +957,8 @@ object Client extends Logging {
val sparkConf = new SparkConf
val args = new ClientArguments(argStrings, sparkConf)
+ // to maintan backwards-compatibility
+ sparkConf.setIfMissing("spark.executor.instances",
args.numExecutors.toString)
--- End diff --
Ah, good catch. This should only be done if dynamic allocation is not
enabled (to maintain compatibility for code that calls the `Client` object
directly, instead of going through spark-submit).
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