Github user andrewor14 commented on a diff in the pull request:
https://github.com/apache/spark/pull/4141#discussion_r24210976
--- Diff:
yarn/src/main/scala/org/apache/spark/deploy/yarn/YarnAllocator.scala ---
@@ -124,10 +123,12 @@ private[yarn] class YarnAllocator(
amClient.getMatchingRequests(RM_REQUEST_PRIORITY, location,
resource).map(_.size).sum
/**
- * Request as many executors from the ResourceManager as needed to reach
the desired total.
+ * Request as many executors from the ResourceManager as needed to reach
the desired total. If
+ * the requested total is smaller than the current number of running
executors, no executors will
+ * be killed.
--- End diff --
never mind, I guess the semantics of `amClient.removeContainerRequest`
refers only to the request itself, but not allocated containers.
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