Github user edwinalu commented on a diff in the pull request:
https://github.com/apache/spark/pull/21221#discussion_r198682779
--- Diff: core/src/main/scala/org/apache/spark/Heartbeater.scala ---
@@ -0,0 +1,69 @@
+/*
+ * 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
+
+import java.util.concurrent.TimeUnit
+
+import org.apache.spark.internal.Logging
+import org.apache.spark.memory.MemoryManager
+import org.apache.spark.metrics.MetricGetter
+import org.apache.spark.util.{ThreadUtils, Utils}
+
+/**
+ * Creates a heartbeat thread which will call the specified
reportHeartbeat function at
+ * intervals of intervalMs.
+ *
+ * @param memoryManager the memory manager for execution and storage
memory.
+ * @param reportHeartbeat the heartbeat reporting function to call.
+ * @param name the thread name for the heartbeater.
+ * @param intervalMs the interval between heartbeats.
+ */
+private[spark] class Heartbeater(
+ memoryManager: MemoryManager,
+ reportHeartbeat: () => Unit,
+ name: String,
+ intervalMs: Long) extends Logging {
+ // Executor for the heartbeat task
+ private val heartbeater =
ThreadUtils.newDaemonSingleThreadScheduledExecutor(name)
+
+ /** Schedules a task to report a heartbeat. */
+ private[spark] def start(): Unit = {
--- End diff --
Removed.
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