Github user vanzin commented on a diff in the pull request:
https://github.com/apache/spark/pull/20604#discussion_r170102063
--- Diff:
core/src/main/scala/org/apache/spark/ExecutorAllocationManager.scala ---
@@ -334,6 +336,11 @@ private[spark] class ExecutorAllocationManager(
// If the new target has not changed, avoid sending a message to the
cluster manager
if (numExecutorsTarget < oldNumExecutorsTarget) {
+ // We lower the target number of executors but don't actively kill
any yet. Killing is
+ // controlled separately by an idle timeout. Its still helpful to
reduce the target number
--- End diff --
nit: it's
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