HadoopSourceAnalyse --- Nodemanager Application FSM

overview

INIT_APPLICATION Handle

收到 该 事件通知，Application 保存当前的用户的ACL信息，并通知logHandler，记录用户信息，App进入INITING状态：

 app.applicationACLs = initEvent.getApplicationACLs();
      app.aclsManager.addApplication(app.getAppId(), app.applicationACLs);
      // Inform the logAggregator
      app.dispatcher.getEventHandler().handle(
          new LogHandlerAppStartedEvent(app.appId, app.user,
              app.credentials, ContainerLogsRetentionPolicy.ALL_CONTAINERS,
              app.applicationACLs)); 

LogHandler记录用户信息之后，发送事件通知：APPLICATION_LOG_HANDLING_INITED 到App

this.appOwners.put(appStartedEvent.getApplicationId(),
            appStartedEvent.getUser());
        this.dispatcher.getEventHandler().handle(
            new ApplicationEvent(appStartedEvent.getApplicationId(),
                ApplicationEventType.APPLICATION_LOG_HANDLING_INITED));

APPLICATION_LOG_HANDLING_INITED Handle

收到该事件之后，App 发送ApplicationLocalizationEvent 去请求Localization Resource 信息。在请求的resource 返回之前，App一直停留在INITING状态：

 app.dispatcher.getEventHandler().handle(
          new ApplicationLocalizationEvent(
              LocalizationEventType.INIT_APPLICATION_RESOURCES, app));

ResourceLocalizationService收到该事件之后，为前用户初始化LocalResourceTracker对像，并发送：APPLICATION_INITED 通知App：

 privateRsrc.putIfAbsent(userName, new LocalResourcesTrackerImpl(userName,
      dispatcher, true, super.getConfig()));
    if (null != appRsrc.putIfAbsent(
      ConverterUtils.toString(app.getAppId()),
      new LocalResourcesTrackerImpl(app.getUser(), dispatcher, false, super
        .getConfig()))) {
      LOG.warn("Initializing application " + app + " already present");
      assert false; // TODO: FIXME assert doesn't help
                    // ^ The condition is benign. Tests should fail and it
                    // should appear in logs, but it's an internal error
                    // that should have no effect on applications
    }
    // 1) Signal container init
    //
    // This is handled by the ApplicationImpl state machine and allows
    // containers to proceed with launching.
    dispatcher.getEventHandler().handle(new ApplicationInitedEvent(
          app.getAppId()));

APPLICATION_INITED Handle

收到该事件，App将发送INIT_CONTAINER 通知container初始化， App进入Running状态：

 // Start all the containers waiting for ApplicationInit
      for (Container container : app.containers.values()) {
        app.dispatcher.getEventHandler().handle(new ContainerInitEvent(
              container.getContainer().getId()));
      }

之后App 等待Finish事件，并 执行保存清理工作， 并退出 。