cloud-fan commented on a change in pull request #26980: [SPARK-27348][CORE]
HeartbeatReceiver should remove lost executors from
CoarseGrainedSchedulerBackend
URL: https://github.com/apache/spark/pull/26980#discussion_r361574984
##########
File path: core/src/main/scala/org/apache/spark/HeartbeatReceiver.scala
##########
@@ -199,14 +202,27 @@ private[spark] class HeartbeatReceiver(sc: SparkContext,
clock: Clock)
if (now - lastSeenMs > executorTimeoutMs) {
logWarning(s"Removing executor $executorId with no recent heartbeats:
" +
s"${now - lastSeenMs} ms exceeds timeout $executorTimeoutMs ms")
- scheduler.executorLost(executorId, SlaveLost("Executor heartbeat " +
- s"timed out after ${now - lastSeenMs} ms"))
- // Asynchronously kill the executor to avoid blocking the current
thread
+ // Asynchronously kill the executor to avoid blocking the current
thread
killExecutorThread.submit(new Runnable {
override def run(): Unit = Utils.tryLogNonFatalError {
// Note: we want to get an executor back after expiring this one,
// so do not simply call `sc.killExecutor` here (SPARK-8119)
sc.killAndReplaceExecutor(executorId)
+ // SPARK-27348: in case of the executors which are not gracefully
shut down,
+ // we should remove lost executors from
CoarseGrainedSchedulerBackend manually
+ // here to guarantee two things:
+ // 1) call scheduler.executorLost() underlying to fail any tasks
assigned to
+ // those executors to avoid app hang
+ // 2) always remove executor information from
CoarseGrainedSchedulerBackend for
+ // a lost executor
+ sc.schedulerBackend match {
+ case backend: CoarseGrainedSchedulerBackend =>
+ backend.driverEndpoint.send(RemoveExecutor(executorId,
+ SlaveLost(s"Executor heartbeat timed out after ${now -
lastSeenMs} ms")))
+ case _: LocalSchedulerBackend =>
+ // LocalSchedulerBackend is used locally and only has one
single executor
+ case _ =>
Review comment:
let's throw an exception here.
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