Github user jerryshao commented on a diff in the pull request:
https://github.com/apache/spark/pull/8710#discussion_r39241760
--- Diff: core/src/main/scala/org/apache/spark/SparkContext.scala ---
@@ -348,10 +348,27 @@ 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)
--- End diff --
Hi @zsxwing , reasons to use `InheritableThreadLocal` can be seen here
(https://github.com/mesos/spark/pull/937). mainly it is used for Spark
Streaming with FIFO scheduling strategy.
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