Github user sryza commented on a diff in the pull request:
https://github.com/apache/spark/pull/4363#discussion_r24212924
--- Diff: core/src/main/scala/org/apache/spark/HeartbeatReceiver.scala ---
@@ -17,33 +17,85 @@
package org.apache.spark
-import akka.actor.Actor
+import scala.concurrent.duration._
+import scala.collection.mutable
+
+import akka.actor.{Actor, Cancellable}
+
import org.apache.spark.executor.TaskMetrics
import org.apache.spark.storage.BlockManagerId
-import org.apache.spark.scheduler.TaskScheduler
+import org.apache.spark.scheduler.{SlaveLost, TaskScheduler}
import org.apache.spark.util.ActorLogReceive
/**
* A heartbeat from executors to the driver. This is a shared message used
by several internal
- * components to convey liveness or execution information for in-progress
tasks.
+ * components to convey liveness or execution information for in-progress
tasks. It will also
+ * expiry the hosts that have no heartbeat for more than
spark.executor.heartbeat.timeoutMs.
--- End diff --
minor grammer nit: "expiry" should be "expire" and "no heartbeat" should be
"not heartbeated".
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