import org.apache.hadoop.yarn.server.applicationhistoryservice.webapp.AHSWebApp; //导入依赖的package包/类
protected void startWebApp() {
  String bindAddress = WebAppUtils.getAHSWebAppURLWithoutScheme(getConfig());
  LOG.info("Instantiating AHSWebApp at " + bindAddress);
  try {
    webApp =
        WebApps
          .$for("applicationhistory", ApplicationHistoryClientService.class,
            ahsClientService, "ws")
          .with(getConfig())
          .withHttpSpnegoPrincipalKey(
            YarnConfiguration.TIMELINE_SERVICE_WEBAPP_SPNEGO_USER_NAME_KEY)
          .withHttpSpnegoKeytabKey(
            YarnConfiguration.TIMELINE_SERVICE_WEBAPP_SPNEGO_KEYTAB_FILE_KEY)
          .at(bindAddress)
          .start(new AHSWebApp(historyManager, timelineStore));
  } catch (Exception e) {
    String msg = "AHSWebApp failed to start.";
    LOG.error(msg, e);
    throw new YarnRuntimeException(msg, e);
  }
}
 

import org.apache.hadoop.yarn.server.applicationhistoryservice.webapp.AHSWebApp; //导入依赖的package包/类
private void startWebApp() {
  Configuration conf = getConfig();
  TimelineAuthenticationFilter.setTimelineDelegationTokenSecretManager(
      secretManagerService.getTimelineDelegationTokenSecretManager());
  // Always load pseudo authentication filter to parse "user.name" in an URL
  // to identify a HTTP request's user in insecure mode.
  // When Kerberos authentication type is set (i.e., secure mode is turned on),
  // the customized filter will be loaded by the timeline server to do Kerberos
  // + DT authentication.
  String initializers = conf.get("hadoop.http.filter.initializers");
  boolean modifiedInitializers = false;

  initializers =
      initializers == null || initializers.length() == 0 ? "" : initializers;

  if (!initializers.contains(CrossOriginFilterInitializer.class.getName())) {
    if(conf.getBoolean(YarnConfiguration
        .TIMELINE_SERVICE_HTTP_CROSS_ORIGIN_ENABLED, YarnConfiguration
            .TIMELINE_SERVICE_HTTP_CROSS_ORIGIN_ENABLED_DEFAULT)) {
      initializers = CrossOriginFilterInitializer.class.getName() + ","
          + initializers;
      modifiedInitializers = true;
    }
  }

  if (!initializers.contains(TimelineAuthenticationFilterInitializer.class
    .getName())) {
    initializers =
        TimelineAuthenticationFilterInitializer.class.getName() + ","
            + initializers;
    modifiedInitializers = true;
  }

  String[] parts = initializers.split(",");
  ArrayList<String> target = new ArrayList<String>();
  for (String filterInitializer : parts) {
    filterInitializer = filterInitializer.trim();
    if (filterInitializer.equals(AuthenticationFilterInitializer.class
      .getName())) {
      modifiedInitializers = true;
      continue;
    }
    target.add(filterInitializer);
  }
  String actualInitializers =
      org.apache.commons.lang.StringUtils.join(target, ",");
  if (modifiedInitializers) {
    conf.set("hadoop.http.filter.initializers", actualInitializers);
  }
  String bindAddress = WebAppUtils.getWebAppBindURL(conf,
                        YarnConfiguration.TIMELINE_SERVICE_BIND_HOST,
                        WebAppUtils.getAHSWebAppURLWithoutScheme(conf));
  LOG.info("Instantiating AHSWebApp at " + bindAddress);
  try {
    webApp =
        WebApps
          .$for("applicationhistory", ApplicationHistoryClientService.class,
              ahsClientService, "ws")
          .with(conf).at(bindAddress).start(
              new AHSWebApp(timelineDataManager, ahsClientService));
  } catch (Exception e) {
    String msg = "AHSWebApp failed to start.";
    LOG.error(msg, e);
    throw new YarnRuntimeException(msg, e);
  }
}
 

import org.apache.hadoop.yarn.server.applicationhistoryservice.webapp.AHSWebApp; //导入依赖的package包/类
private void startWebApp() {
  Configuration conf = getConfig();
  TimelineAuthenticationFilter.setTimelineDelegationTokenSecretManager(
      secretManagerService.getTimelineDelegationTokenSecretManager());
  // Always load pseudo authentication filter to parse "user.name" in an URL
  // to identify a HTTP request's user in insecure mode.
  // When Kerberos authentication type is set (i.e., secure mode is turned on),
  // the customized filter will be loaded by the timeline server to do Kerberos
  // + DT authentication.
  String initializers = conf.get("hadoop.http.filter.initializers");
  boolean modifiedInitializers = false;

  initializers =
      initializers == null || initializers.length() == 0 ? "" : initializers;

  if (!initializers.contains(CrossOriginFilterInitializer.class.getName())) {
    if(conf.getBoolean(YarnConfiguration
        .TIMELINE_SERVICE_HTTP_CROSS_ORIGIN_ENABLED, YarnConfiguration
            .TIMELINE_SERVICE_HTTP_CROSS_ORIGIN_ENABLED_DEFAULT)) {
      initializers = CrossOriginFilterInitializer.class.getName() + ","
          + initializers;
      modifiedInitializers = true;
    }
  }

  if (!initializers.contains(TimelineAuthenticationFilterInitializer.class
    .getName())) {
    initializers =
        TimelineAuthenticationFilterInitializer.class.getName() + ","
            + initializers;
    modifiedInitializers = true;
  }

  String[] parts = initializers.split(",");
  ArrayList<String> target = new ArrayList<String>();
  for (String filterInitializer : parts) {
    filterInitializer = filterInitializer.trim();
    if (filterInitializer.equals(AuthenticationFilterInitializer.class
      .getName())) {
      modifiedInitializers = true;
      continue;
    }
    target.add(filterInitializer);
  }
  String actualInitializers =
      org.apache.commons.lang.StringUtils.join(target, ",");
  if (modifiedInitializers) {
    conf.set("hadoop.http.filter.initializers", actualInitializers);
  }
  String bindAddress = WebAppUtils.getWebAppBindURL(conf,
                        YarnConfiguration.TIMELINE_SERVICE_BIND_HOST,
                        WebAppUtils.getAHSWebAppURLWithoutScheme(conf));
  LOG.info("Instantiating AHSWebApp at " + bindAddress);
  try {
    webApp =
        WebApps
          .$for("applicationhistory", ApplicationHistoryClientService.class,
              ahsClientService, "ws")
          .with(conf).at(bindAddress).start(
              new AHSWebApp(timelineDataManager, historyManager));
  } catch (Exception e) {
    String msg = "AHSWebApp failed to start.";
    LOG.error(msg, e);
    throw new YarnRuntimeException(msg, e);
  }
}