Github user sryza commented on a diff in the pull request:
https://github.com/apache/spark/pull/4363#discussion_r24107971
--- Diff: core/src/main/scala/org/apache/spark/HeartbeatReceiver.scala ---
@@ -32,18 +33,56 @@ private[spark] case class Heartbeat(
taskMetrics: Array[(Long, TaskMetrics)], // taskId -> TaskMetrics
blockManagerId: BlockManagerId)
+private[spark] case object ExpireDeadHosts
+
private[spark] case class HeartbeatResponse(reregisterBlockManager:
Boolean)
/**
* Lives in the driver to receive heartbeats from executors..
--- End diff --
We should add a header comment that communicates that one of the functions
of the HeartbeatReceiver is to expire executors.
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