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

    https://github.com/apache/spark/pull/18414#discussion_r123889666
  
    --- Diff: core/src/main/scala/org/apache/spark/deploy/master/Master.scala 
---
    @@ -566,10 +566,15 @@ private[deploy] class Master(
         // Update application state if executors are accepted and RUNNING
         apps.foreach(appInfo => {
           val app = idToApp(appInfo.id)
    -      if(app.executors.filter(_._2.state != 
ExecutorState.RUNNING).isEmpty) {
    -        app.state = ApplicationState.RUNNING
    -        logInfo(s"Application :: ${app.id} status updated to RUNNING 
state")
    -      }})
    +      apps.foreach(f = appInfo => {
    +        val app = idToApp(appInfo.id)
    +        if (app.executors.size > 0 &&
    --- End diff --
    
    It might be more clear to write this condition like this
    ```scala
    if (app.executors.nonEmpty && app.executors.forall(_._2.state == 
ExecutorState.RUNNING))
    ```



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