fix failed unit test.

Author: hfutatzhanghb

hadoop-hdfs-project/hadoop-hdfs-rbf/src/main/java/org/apache/hadoop/hdfs/server/federation/router/DFSRouterFaultInjector.java

@@ -26,18 +26,18 @@ public class DFSRouterFaultInjector {
   @VisibleForTesting
   private static DFSRouterFaultInjector instance =
       new DFSRouterFaultInjector();
-  
+
   @VisibleForTesting
   public static DFSRouterFaultInjector get() {
     return instance;
   }
 
   public static void set(DFSRouterFaultInjector injector) {
     instance = injector;
-  } 
-  
+  }
+
   @VisibleForTesting
   public boolean shouldSkipShutdownAsyncExecutors() {
-    return false;
+    return true;
   }
 }

hadoop-hdfs-project/hadoop-hdfs-rbf/src/main/java/org/apache/hadoop/hdfs/server/federation/router/RouterRpcServer.java

@@ -510,6 +510,7 @@ private void shutdownAsyncRouterRpcExecutors() {
 
   /**
    * Init router async handlers and router async responders.
+   * @param configuration the configuration.
    */
   public void initAsyncThreadPools(Configuration configuration) {
     LOG.info("Begin initialize asynchronous handler and responder thread pool.");

hadoop-hdfs-project/hadoop-hdfs-rbf/src/main/resources/hdfs-rbf-default.xml

@@ -136,15 +136,15 @@
   </property>
 
   <property>
-    <name>dfs.federation.router.rpc.async.handler.count</name>
-    <value>2</value>
+    <name>dfs.federation.router.async.rpc.handler.count</name>
+    <value>10</value>
     <description>
       The number of async handler for the router to handle RPC client requests.
     </description>
   </property>
 
   <property>
-    <name>dfs.federation.router.rpc.async.responder.count</name>
+    <name>dfs.federation.router.async.rpc.responder.count</name>
     <value>10</value>
     <description>
       The number of async responder for the router to handle responses.