Github user CodingCat commented on a diff in the pull request:
https://github.com/apache/spark/pull/186#discussion_r11975921
--- Diff: core/src/main/scala/org/apache/spark/scheduler/DAGScheduler.scala
---
@@ -322,6 +289,14 @@ class DAGScheduler(
missing.toList
}
+ private def startDAGSchedulerActors() {
+ dagSchedulerActorSupervisor = env.actorSystem.actorOf(Props(
+ new DAGSchedulerActorSupervisor(this)))
+ while (dagSchedulerActorSupervisor == null || eventProcessActor ==
null) {
--- End diff --
the process is like, akka firstly builds a object with only a mailbox (no
other functionalities), and returns....then in a separate thread it initializes
the other components, the messages received during this are queued in that
mailbox...upon the completion of the initialization, the old mailbox is copied
to the new one and processing of the messages starts....(my understanding)
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