Github user vanzin commented on a diff in the pull request:
    --- 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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