Github user sryza commented on a diff in the pull request:
https://github.com/apache/spark/pull/6394#discussion_r35148227
--- Diff:
core/src/main/scala/org/apache/spark/ExecutorAllocationManager.scala ---
@@ -295,7 +295,9 @@ private[spark] class ExecutorAllocationManager(
// If the new target has not changed, avoid sending a message to the
cluster manager
if (numExecutorsTarget < oldNumExecutorsTarget) {
- client.requestTotalExecutors(numExecutorsTarget)
+ val (localityAwarePendingTasks, preferredLocalities) =
listener.executorPlacementHints()
--- End diff --
Can we cache the result of `executorPlacementHints` and only update it when
stages come or go?
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