squito commented on a change in pull request #25236: [SPARK-28487][k8s] More
responsive dynamic allocation with K8S.
URL: https://github.com/apache/spark/pull/25236#discussion_r311217419
##########
File path:
resource-managers/kubernetes/core/src/main/scala/org/apache/spark/scheduler/cluster/k8s/KubernetesClusterSchedulerBackend.scala
##########
@@ -134,14 +129,37 @@ private[spark] class KubernetesClusterSchedulerBackend(
super.getExecutorIds()
}
- override def doKillExecutors(executorIds: Seq[String]): Future[Boolean] =
Future[Boolean] {
- kubernetesClient
- .pods()
- .withLabel(SPARK_APP_ID_LABEL, applicationId())
- .withLabel(SPARK_ROLE_LABEL, SPARK_POD_EXECUTOR_ROLE)
- .withLabelIn(SPARK_EXECUTOR_ID_LABEL, executorIds: _*)
- .delete()
- // Don't do anything else - let event handling from the Kubernetes API do
the Spark changes
+ override def doKillExecutors(executorIds: Seq[String]): Future[Boolean] = {
+ executorIds.foreach { id =>
+ removeExecutor(id, ExecutorKilled)
+ }
+
+ // Give some time for the executors to shut themselves down, then
forcefully kill any
+ // remaining ones. This intentionally ignores the configuration about
whether pods
+ // should be deleted; only executors that shut down gracefully (and are
then collected
+ // by the ExecutorPodsLifecycleManager) will respect that configuration.
+ val killTask = new Runnable() {
+ override def run(): Unit = Utils.tryLogNonFatalError {
+ val running = kubernetesClient
+ .pods()
+ .withField("status.phase", "Running")
+ .withLabel(SPARK_APP_ID_LABEL, applicationId())
+ .withLabel(SPARK_ROLE_LABEL, SPARK_POD_EXECUTOR_ROLE)
+ .withLabelIn(SPARK_EXECUTOR_ID_LABEL, executorIds: _*)
+
+ if (!running.list().getItems().isEmpty()) {
+ logInfo(s"Forcefully deleting ${running.list().getItems().size()}
pods " +
+ s"(out of ${executorIds.size}) that are still running after
graceful shutdown period.")
+ running.delete()
+ }
+ }
+ }
+ executorService.schedule(killTask,
conf.get(KUBERNETES_DYN_ALLOC_KILL_GRACE_PERIOD),
+ TimeUnit.MILLISECONDS)
+
+ // Return an immediate success, since we can't confirm or deny that
executors have been
+ // actually shut down without waiting too long and blocking the allocation
thread.
+ Future.successful(true)
Review comment:
ok, thanks, I buy that explanation
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