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Spark中Worker源码分析(二)

标签:
Spark

4.receive方法,
receive方法中消息类型主要分为以下14种情况:

(1)worker向master注册成功后,详见代码
(2)worker向master发送心跳消息,如果还没有注册到master上,该消息将被忽略,详见代码
(3)worker的工作空间的清理,详见代码
(4)更换master,详见代码
(5)worker注册失败,详见代码
(6)再次连接worker,详见代码
(7)创建executor,详见代码
(8)executor的转态发生改变时,详见代码
(9)kill executor,详见代码
(10)创建driver,详见代码
(11)kill driver,详见代码
(12)driver的状态发生变化时,详见代码
(13)将worker注册到master上,详见代码
(14)app执行完毕,详见代码
worker与master相关的交互为(1)(2)(4)(6)(13)
worker与driver相关的交互为(10)(11)(12)
worker与executor相关的交互为(3)(7)(8)(9)(14),需要说明的是(3)(14)它们的完成都与executor有着密切的联系。

<code>
override def receive: PartialFunction[Any, Unit] = {
//(1)注册成功的Woker
case RegisteredWorker(masterRef, masterWebUiUrl) =>
logInfo("Successfully registered with master " + masterRef.address.toSparkURL)
registered = true
changeMaster(masterRef, masterWebUiUrl)
//守护线程15s发送一次心跳消息
forwordMessageScheduler.scheduleAtFixedRate(new Runnable {
override def run(): Unit = Utils.tryLogNonFatalError {
self.send(SendHeartbeat)
}
}, 0, HEARTBEAT_MILLIS, TimeUnit.MILLISECONDS)
//如果允许清理
if (CLEANUP_ENABLED) {
logInfo(s"Worker cleanup enabled; old application directories will be deleted in: $workDir")
forwordMessageScheduler.scheduleAtFixedRate(new Runnable {
override def run(): Unit = Utils.tryLogNonFatalError {
//守护线程30min清理app文件夹
self.send(WorkDirCleanup)
}
}, CLEANUP_INTERVAL_MILLIS, CLEANUP_INTERVAL_MILLIS, TimeUnit.MILLISECONDS)
}
//(2)worker向master发送心跳消息,如果还没有注册到master上,该消息将被忽略
case SendHeartbeat =>
if (connected) { sendToMaster(Heartbeat(workerId, self)) }
//(3)worker的工作空间的清理
case WorkDirCleanup =>
//为了加快独立将来独立线程的清理工作,不要占用worker rpcEndpoint的端口号,拷贝ids所以它可以被清理线程使用
val appIds = executors.values.map(.appId).toSet
val cleanupFuture = concurrent.future {
val appDirs = workDir.listFiles()
if (appDirs == null) {
throw new IOException("ERROR: Failed to list files in " + appDirs)
}
appDirs.filter { dir =>
//目录正在被app使用-当清理时检查app是否在运行
val appIdFromDir = dir.getName
val isAppStillRunning = appIds.contains(appIdFromDir)
dir.isDirectory && !isAppStillRunning &&
!Utils.doesDirectoryContainAnyNewFiles(dir, APP_DATA_RETENTION_SECONDS)
}.foreach { dir =>
logInfo(s"Removing directory: ${dir.getPath}")
Utils.deleteRecursively(dir)
}
}(cleanupThreadExecutor)
cleanupFuture.onFailure {
case e: Throwable =>
logError("App dir cleanup failed: " + e.getMessage, e)
}(cleanupThreadExecutor)
//(4)更换master
case MasterChanged(masterRef, masterWebUiUrl) =>
logInfo("Master has changed, new master is at " + masterRef.address.toSparkURL)
changeMaster(masterRef, masterWebUiUrl)
val execs = executors.values.
map(e => new ExecutorDescription(e.appId, e.execId, e.cores, e.state))
masterRef.send(WorkerSchedulerStateResponse(workerId, execs.toList, drivers.keys.toSeq))
//(5)worker注册失败
case RegisterWorkerFailed(message) =>
if (!registered) {
logError("Worker registration failed: " + message)
System.exit(1)
}
//(6)再次连接Worker
case ReconnectWorker(masterUrl) =>
logInfo(s"Master with url $masterUrl requested this worker to reconnect.")
//再次将worker注册到masters上
registerWithMaster()
//(7)创建Executor
case LaunchExecutor(masterUrl, appId, execId, appDesc, cores
, memory_) =>if (masterUrl != activeMasterUrl) {
logWarning("Invalid Master (" + masterUrl + ") attempted to launch executor.")
} else {
try {
logInfo("Asked to launch executor %s/%d for %s".format(appId, execId, appDesc.name))
//创建executor的工作目录
val executorDir = new File(workDir, appId + "/" + execId)
if (!executorDir.mkdirs()) {
throw new IOException("Failed to create directory " + executorDir)
}
//为executors创建本地目录,通过SPARK_EXECUTOR_DIRS环境变量设置,当app执行完后并删除
val appLocalDirs = appDirectories.get(appId).getOrElse {
Utils.getOrCreateLocalRootDirs(conf).map { dir =>
val appDir = Utils.createDirectory(dir, namePrefix = "executor")
Utils.chmod700(appDir)
appDir.getAbsolutePath()
}.toSeq
}
appDirectories(appId) = appLocalDirs
val manager = new ExecutorRunner(
appId,
execId,
appDesc.copy(command = Worker.maybeUpdateSSLSettings(appDesc.command, conf)),
cores_,
memory_,
self,
workerId,
host,
webUi.boundPort,
publicAddress,
sparkHome,
executorDir,
workerUri,
conf,
appLocalDirs, ExecutorState.LOADING)
executors(appId + "/" + execId) = manager
manager.start()
coresUsed += cores_
memoryUsed += memory_
sendToMaster(ExecutorStateChanged(appId, execId, manager.state, None, None))
} catch {
case e: Exception => {
logError(s"Failed to launch executor $appId/$execId for ${appDesc.name}.", e)
if (executors.contains(appId + "/" + execId)) {
executors(appId + "/" + execId).kill()
executors -= appId + "/" + execId
}
sendToMaster(ExecutorStateChanged(appId, execId, ExecutorState.FAILED,
Some(e.toString), None))
}
}
}
//(8)executor的转态发生改变时
case executorStateChanged @ ExecutorStateChanged(appId, execId, state, message, exitStatus) =>
handleExecutorStateChanged(executorStateChanged)
//(9)kill executor
case KillExecutor(masterUrl, appId, execId) =>
if (masterUrl != activeMasterUrl) {
logWarning("Invalid Master (" + masterUrl + ") attempted to launch executor " + execId)
} else {
val fullId = appId + "/" + execId
executors.get(fullId) match {
case Some(executor) =>
logInfo("Asked to kill executor " + fullId)
executor.kill()
case None =>
logInfo("Asked to kill unknown executor " + fullId)
}
}
//(10)创建Driver
case LaunchDriver(driverId, driverDesc) => {
logInfo(s"Asked to launch driver $driverId")
val driver = new DriverRunner(
conf,
driverId,
workDir,
sparkHome,
driverDesc.copy(command = Worker.maybeUpdateSSLSettings(driverDesc.command, conf)),
self,
workerUri,
securityMgr)
drivers(driverId) = driver
driver.start(
coresUsed += driverDesc.cores
memoryUsed += driverDesc.mem
}
//(11)kill Driver
case KillDriver(driverId) => {
logInfo(s"Asked to kill driver $driverId")
drivers.get(driverId) match {
case Some(runner) =>
runner.kill()
case None =>
logError(s"Asked to kill unknown driver $driverId")
}
}
//(12)driver的状态发生变化时
case driverStateChanged @ DriverStateChanged(driverId, state, exception) => {
handleDriverStateChanged(driverStateChanged)
}
//(13)将worker注册到master上
case ReregisterWithMaster =>
reregisterWithMaster()
//(14)app执行完毕
case ApplicationFinished(id) =>
finishedApps += id
//删除执行完的app在执行过程中创建的本地文件
maybeCleanupApplication(id)
}
</code>



作者:lehi
链接:https://www.jianshu.com/p/5719f4d29d23


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