Github user andrewor14 commented on a diff in the pull request:
https://github.com/apache/spark/pull/3548#discussion_r21142103
--- Diff: core/src/main/scala/org/apache/spark/deploy/DeployMessage.scala
---
@@ -101,6 +101,14 @@ private[deploy] object DeployMessages {
case class MasterChangeAcknowledged(appId: String)
+ /**
+ * Periodic heartbeat from the app client to the master, used to detect
driver death and to
+ * detect drivers that have not obtained any usable executors.
+ * @param appId the application id.
+ * @param hasExecutors true if the app client has at least one running
executor, false otherwise.
--- End diff --
maybe `hasRegisteredExecutors` to be more specific. We don't actually care
if they're running any tasks
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