spark Heartbeater 源码
spark Heartbeater 代码
文件路径：/core/src/main/scala/org/apache/spark/Heartbeater.scala
/*
* 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.util.{ThreadUtils, Utils}
/**
* Creates a heartbeat thread which will call the specified reportHeartbeat function at
* intervals of intervalMs.
*
* @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(
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. */
def start(): Unit = {
// Wait a random interval so the heartbeats don't end up in sync
val initialDelay = intervalMs + (math.random * intervalMs).asInstanceOf[Int]
val heartbeatTask = new Runnable() {
override def run(): Unit = Utils.logUncaughtExceptions(reportHeartbeat())
}
heartbeater.scheduleAtFixedRate(heartbeatTask, initialDelay, intervalMs, TimeUnit.MILLISECONDS)
}
/** Stops the heartbeat thread. */
def stop(): Unit = {
heartbeater.shutdown()
heartbeater.awaitTermination(10, TimeUnit.SECONDS)
}
}
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