Github user maropu commented on a diff in the pull request: https://github.com/apache/spark/pull/20136#discussion_r159239867 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/internal/SQLConf.scala --- @@ -70,7 +71,10 @@ object SQLConf { * Default config. Only used when there is no active SparkSession for the thread. * See [[get]] for more information. */ - private val fallbackConf = new ThreadLocal[SQLConf] { + private lazy val fallbackConf = new ThreadLocal[SQLConf] { + // assert that we're only accessing it on the driver. + assert(SparkEnv.get.executorId == SparkContext.DRIVER_IDENTIFIER) --- End diff -- Need null checks for `SparkEnv`?
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