Github user vanzin commented on a diff in the pull request:
https://github.com/apache/spark/pull/20604#discussion_r169420133
--- Diff:
core/src/main/scala/org/apache/spark/ExecutorAllocationManager.scala ---
@@ -334,6 +336,10 @@ 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. We do this
--- End diff --
I'm not sure I follow this comment.
From my reading of it, it's saying that you don't want to kill executors
because you don't want to immediately get a new one to replace it. But how can
that happen, if you're also lowering the target number?
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