Github user vanzin commented on a diff in the pull request:
https://github.com/apache/spark/pull/7786#discussion_r40031211
--- 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 --
If you plumb `driverRef` from `registerAM` into this method
(`launchReporterThread`), then you can send the message to the driver directly,
instead of making an extra hop in the AM for no reason.
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