Github user gatorsmile commented on a diff in the pull request: https://github.com/apache/spark/pull/20136#discussion_r159252410 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/internal/SQLConf.scala --- @@ -1087,6 +1089,11 @@ object SQLConf { class SQLConf extends Serializable with Logging { import SQLConf._ + if (Utils.isTesting && SparkEnv.get != null) { + // assert that we're only accessing it on the driver. + assert(SparkEnv.get.executorId == SparkContext.DRIVER_IDENTIFIER) --- End diff -- Also with a reasonable error message?
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