Github user tgravescs commented on a diff in the pull request:

    https://github.com/apache/spark/pull/18651#discussion_r128827627
  
    --- Diff: 
resource-managers/yarn/src/main/scala/org/apache/spark/deploy/yarn/YarnAllocator.scala
 ---
    @@ -525,9 +534,11 @@ private[yarn] class YarnAllocator(
                   } catch {
                     case NonFatal(e) =>
                       logError(s"Failed to launch executor $executorId on 
container $containerId", e)
    -                  // Assigned container should be released immediately to 
avoid unnecessary resource
    -                  // occupation.
    +                  // Assigned container should be released immediately
    +                  // to avoid unnecessary resource occupation.
                       amClient.releaseAssignedContainer(containerId)
    +              } finally {
    +                numExecutorsStarting.decrementAndGet()
    --- End diff --
    
    sorry don't follow. updateInternalState is called right after the run if it 
succeeds.  You do still need to handle the failure as well but in the failure 
the running is never incremented


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