Github user uncleGen commented on a diff in the pull request:
https://github.com/apache/spark/pull/16827#discussion_r99776850
--- Diff:
streaming/src/main/scala/org/apache/spark/streaming/Checkpoint.scala ---
@@ -63,6 +63,8 @@ class Checkpoint(ssc: StreamingContext, val
checkpointTime: Time)
val newReloadConf = new SparkConf(loadDefaults = true)
propertiesToReload.foreach { prop =>
newReloadConf.getOption(prop).foreach { value =>
+ // (trick) avoid SPARK-19482.
+ newSparkConf.remove(prop)
newSparkConf.set(prop, value)
--- End diff --
here, we should remove properties which will be reloaded, otherwise will
fail for some special properties, like 'spark.master'
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