Flink源码解析(standalone)之taskmanager启动

1、简单粗暴，flink-daemon.sh脚本可知taskmanager执行类为:org.apache.flink.runtime.taskmanager.TaskManager
2、main方法里面，最主要的就是启动taskmanager

try {
      SecurityUtils.getInstalledContext.runSecured(new Callable[Unit] {
        override def call(): Unit = {
        //运行taskmanager，记住classOf[TaskManager]，这是taksManagerActor的启动类，生命周期方法在此类中
          selectNetworkInterfaceAndRunTaskManager(configuration, resourceId, classOf[TaskManager])
        }
      })
    }

3、selectNetworkInterfaceAndRunTaskManager里面主要做了三件事:
a、创建高可用服务
b、给taskmanager分配主机、端口范围
c、启动taskmanager

  def selectNetworkInterfaceAndRunTaskManager(
      configuration: Configuration,
      resourceID: ResourceID,
      taskManagerClass: Class[_ <: TaskManager])
    : Unit = {

    val highAvailabilityServices = HighAvailabilityServicesUtils.createHighAvailabilityServices(
      configuration,
      Executors.directExecutor(),
      AddressResolution.TRY_ADDRESS_RESOLUTION)
	//选择网络接口和端口范围
    val (taskManagerHostname, actorSystemPortRange) = selectNetworkInterfaceAndPortRange(
      configuration,
      highAvailabilityServices)

    try {
    //启动taksmanager
      runTaskManager(
        taskManagerHostname,
        resourceID,
        actorSystemPortRange,
        configuration,
        highAvailabilityServices,
        taskManagerClass)
    } finally {
      try {
        highAvailabilityServices.close()
      } catch {
        case t: Throwable => LOG.warn("Could not properly stop the high availability services.", t)
      }
    }
  }

4、进入runTaskManager方法，里面主要是根据上面分配的端口范围，找到可用的端口分配给taskmanager通信使用，然后调用重载的runTaskManager方法启动taskmanager

def runTaskManager(
    taskManagerHostname: String,
    resourceID: ResourceID,
    actorSystemPortRange: java.util.Iterator[Integer],
    configuration: Configuration,
    highAvailabilityServices: HighAvailabilityServices,
    taskManagerClass: Class[_ <: TaskManager])
    : Unit = {
	//通过创建socket，找到可用的端口
    val result = AkkaUtils.retryOnBindException({
      // Try all ports in the range until successful
      val socket = N