Github user li-zhihui commented on a diff in the pull request:
https://github.com/apache/spark/pull/900#discussion_r13688559
--- Diff:
core/src/main/scala/org/apache/spark/scheduler/TaskSchedulerImpl.scala ---
@@ -431,6 +431,16 @@ private[spark] class TaskSchedulerImpl(
// By default, rack is unknown
def getRackForHost(value: String): Option[String] = None
+ override def waitBackendReady():Unit={
+ if(backend.isReady){
+ return
+ }
+ while(!backend.isReady){
+ synchronized{
+ this.wait(100)
--- End diff --
Just for programming simply. :)
If someone would like to implement more backend implementations or change
backend.isReady somewhere, they needn't to call NOTIFY().
But, waiting 100 milliseconds maybe too long, is 10 milliseconds OK?
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