Github user tanyatik commented on a diff in the pull request:
https://github.com/apache/spark/pull/2062#discussion_r16532536
--- Diff:
core/src/main/scala/org/apache/spark/deploy/master/DriverInfo.scala ---
@@ -33,4 +33,17 @@ private[spark] class DriverInfo(
@transient var exception: Option[Exception] = None
/* Most recent worker assigned to this driver */
@transient var worker: Option[WorkerInfo] = None
+
+ init()
+
+ private def readObject(in: java.io.ObjectInputStream): Unit = {
+ in.defaultReadObject()
+ init()
+ }
+
+ private def init(): Unit = {
+ state = DriverState.SUBMITTED
+ worker = None
+ exception = None
+ }
--- End diff --
When a field is deserialized, transient fields become null value, not None,
thats why NullPointerException happens.
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