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[SPARK-20558][CORE] clear InheritableThreadLocal variables in SparkContext when stopping it #17833

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[SPARK-20558][CORE] clear InheritableThreadLocal variables in SparkContext when stopping it #17833

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3 changes: 3 additions & 0 deletions core/src/main/scala/org/apache/spark/SparkContext.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -1938,6 +1938,9 @@ class SparkContext(config: SparkConf) extends Logging {
}
SparkEnv.set(null)
}
// Clear this `InheritableThreadLocal`, or it will still be inherited in child threads even this
// `SparkContext` is stopped.
localProperties.remove()
// Unset YARN mode system env variable, to allow switching between cluster types.
System.clearProperty("SPARK_YARN_MODE")
SparkContext.clearActiveContext()
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