Github user jerryshao commented on a diff in the pull request:
https://github.com/apache/spark/pull/7786#discussion_r40236632
--- Diff:
yarn/src/main/scala/org/apache/spark/deploy/yarn/ApplicationMaster.scala ---
@@ -346,7 +347,16 @@ private[spark] class ApplicationMaster(
"Max number of executor failures reached")
} else {
logDebug("Sending progress")
- allocator.allocateResources()
+ allocator.updateResources()
+
+ // Get the preemption executors from YarnAllocator, if
preemption executor list is
+ // changed compared to last time, notify scheduler backend
this preemption executor
+ // list.
+ val preemptionExecutors = allocator.getPreemptionExecutors
+ if (preemptionExecutors != lastPreemptionExecutors) {
+ amEndpoint.send(PreemptionExecutors(preemptionExecutors))
--- End diff --
I would incline to use `amEndpoint` here as to keep consistent with other
places like `AddWebFIlter`.
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