Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/4055#discussion_r23437961
--- Diff: core/src/main/scala/org/apache/spark/scheduler/Task.scala ---
@@ -106,7 +106,22 @@ private[spark] abstract class Task[T](val stageId:
Int, var partitionId: Int) ex
if (interruptThread && taskThread != null) {
taskThread.interrupt()
}
- }
+ }
+
+ override def hashCode(): Int = {
+ val state = Seq(stageId, partitionId)
+ state.map(_.hashCode()).foldLeft(0)((a, b) => 31 * a + b)
--- End diff --
Maybe a better way is `(stageId + partitionId) * (stageId + partitionId +
1) / 2 + partitionId`.
See http://en.wikipedia.org/wiki/Pairing_function#Cantor_pairing_function
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