goiri commented on code in PR #4594:
URL: https://github.com/apache/hadoop/pull/4594#discussion_r929108932


##########
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-router/src/main/java/org/apache/hadoop/yarn/server/router/webapp/RouterWebServices.java:
##########
@@ -206,50 +179,20 @@ protected Map<String, RequestInterceptorChainWrapper> 
getPipelines() {
    */
   @VisibleForTesting
   protected RESTRequestInterceptor createRequestInterceptorChain() {
-
-    List<String> interceptorClassNames = getInterceptorClassNames(conf);
-
-    RESTRequestInterceptor pipeline = null;
-    RESTRequestInterceptor current = null;
-    for (String interceptorClassName : interceptorClassNames) {
-      try {
-        Class<?> interceptorClass = conf.getClassByName(interceptorClassName);
-        if (RESTRequestInterceptor.class.isAssignableFrom(interceptorClass)) {
-          RESTRequestInterceptor interceptorInstance =
-              (RESTRequestInterceptor) ReflectionUtils
-                  .newInstance(interceptorClass, conf);
-          if (pipeline == null) {
-            pipeline = interceptorInstance;
-            current = interceptorInstance;
-            continue;
-          } else {
-            current.setNextInterceptor(interceptorInstance);
-            current = interceptorInstance;
-          }
-        } else {
-          throw new YarnRuntimeException(
-              "Class: " + interceptorClassName + " not instance of "
-                  + RESTRequestInterceptor.class.getCanonicalName());
-        }
-      } catch (ClassNotFoundException e) {
-        throw new YarnRuntimeException(
-            "Could not instantiate RESTRequestInterceptor: "
-                + interceptorClassName,
-            e);
-      }
-    }
-
-    if (pipeline == null) {
-      throw new YarnRuntimeException(
-          "RequestInterceptor pipeline is not configured in the system");
+    try {
+      return RouterServerUtil.createRequestInterceptorChain(conf,
+          YarnConfiguration.ROUTER_WEBAPP_INTERCEPTOR_CLASS_PIPELINE,
+          YarnConfiguration.DEFAULT_ROUTER_WEBAPP_INTERCEPTOR_CLASS,
+          RESTRequestInterceptor.class);
+    } catch (YarnRuntimeException ex) {
+      throw new YarnRuntimeException("Create RequestInterceptor Chain error.", 
ex);

Review Comment:
   We catch the exception to throw it?



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