Github user andrewor14 commented on a diff in the pull request: https://github.com/apache/spark/pull/8710#discussion_r39345043 --- Diff: core/src/main/scala/org/apache/spark/SparkContext.scala --- @@ -348,10 +348,24 @@ class SparkContext(config: SparkConf) extends Logging with ExecutorAllocationCli // Thread Local variable that can be used by users to pass information down the stack private val localProperties = new InheritableThreadLocal[Properties] { - override protected def childValue(parent: Properties): Properties = new Properties(parent) + override protected def childValue(parent: Properties): Properties = { + // Note: make a clone such that changes in the parent properties aren't reflected in + // the those of the children threads, which has confusing semantics (SPARK-10564). + val p = new Properties + val filtered = parent.asScala.filter { case (k, _) => + !nonInheritedLocalProperties.contains(k) + } + p.putAll(filtered.asJava) + p + } override protected def initialValue(): Properties = new Properties() } + /** + * Keys of local properties that should not be inherited by children threads. + */ + private[spark] val nonInheritedLocalProperties: HashSet[String] = new HashSet[String] --- End diff -- the whole point of SPARK-10548 is to avoid inheriting the SQL execution ID. How can we avoid that with just cloning?
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