Github user liyinan926 commented on a diff in the pull request:
https://github.com/apache/spark/pull/19717#discussion_r153366772
--- Diff:
resource-managers/kubernetes/core/src/main/scala/org/apache/spark/deploy/k8s/submit/LoggingPodStatusWatcher.scala
---
@@ -0,0 +1,184 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.spark.deploy.k8s.submit
+
+import java.util.concurrent.{CountDownLatch, TimeUnit}
+
+import scala.collection.JavaConverters._
+
+import io.fabric8.kubernetes.api.model.{ContainerStateRunning,
ContainerStateTerminated, ContainerStateWaiting, ContainerStatus, Pod, Time}
+import io.fabric8.kubernetes.client.{KubernetesClientException, Watcher}
+import io.fabric8.kubernetes.client.Watcher.Action
+
+import org.apache.spark.SparkException
+import org.apache.spark.internal.Logging
+import org.apache.spark.util.ThreadUtils
+
+private[k8s] trait LoggingPodStatusWatcher extends Watcher[Pod] {
+ def awaitCompletion(): Unit
+}
+
+/**
+ * A monitor for the running Kubernetes pod of a Spark application. Status
logging occurs on
+ * every state change and also at an interval for liveness.
+ *
+ * @param appId application ID.
+ * @param maybeLoggingInterval ms between each state request. If provided,
must be a positive
+ * number.
+ */
+private[k8s] class LoggingPodStatusWatcherImpl(
+ appId: String, maybeLoggingInterval: Option[Long])
--- End diff --
Done.
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