Github user dragos commented on a diff in the pull request:
https://github.com/apache/spark/pull/4984#discussion_r30055643
--- Diff:
core/src/main/scala/org/apache/spark/scheduler/cluster/mesos/CoarseMesosSchedulerBackend.scala
---
@@ -281,4 +319,38 @@ private[spark] class CoarseMesosSchedulerBackend(
super.applicationId
}
+ override def doRequestTotalExecutors(requestedTotal: Int): Boolean = {
+ // We don't truly know if we can fulfill the full amount of executors
+ // since at coarse grain it depends on the amount of slaves available.
+ logInfo("Capping the total amount of executors to " + requestedTotal)
+ executorLimitOption = Option(requestedTotal)
+ true
+ }
+
+ override def doKillExecutors(executorIds: Seq[String]): Boolean = {
+ if (mesosDriver == null) {
+ logWarning("Asked to kill executors before the executor was
started.")
+ return false
+ }
+
+ val slaveIdToTaskId = taskIdToSlaveId.inverse()
+ for (executorId <- executorIds) {
+ val slaveId = executorId.split("/")(0)
+ if (slaveIdToTaskId.contains(slaveId)) {
+ mesosDriver.killTask(
+
TaskID.newBuilder().setValue(slaveIdToTaskId.get(slaveId).toString).build)
+ pendingRemovedSlaveIds += slaveId
+ } else {
+ logWarning("Unable to find executor Id '" + executorId + "' in
Mesos scheduler")
+ }
+ }
+
+ // We cannot simply decrement from the existing executor limit as we
may not able to
+ // launch as much executors as the limit. But we assume if we are
notified to kill
+ // executors, that means the scheduler wants to set the limit that is
less than
+ // the amount of the executors that has been launched. Therefore, we
take the existing
+ // amount of executors launched and deduct the executors killed as the
new limit.
+ executorLimitOption = Option(taskIdToSlaveId.size -
pendingRemovedSlaveIds.size)
--- End diff --
Oh, I forgot to push my latest changes. Yes, it's `max` now, as you
suggested
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