fix checkstyle and remove useless varaiable.

Author: hfutatzhanghb

hadoop-hdfs-project/hadoop-hdfs-rbf/src/main/java/org/apache/hadoop/hdfs/server/federation/fairness/RouterAsyncRpcFairnessPolicyController.java

@@ -38,7 +38,7 @@ public class RouterAsyncRpcFairnessPolicyController extends
 
   private static final Logger LOG =
       LoggerFactory.getLogger(RouterAsyncRpcFairnessPolicyController.class);
-  
+
   public RouterAsyncRpcFairnessPolicyController(Configuration conf) {
     init(conf);
   }
@@ -52,7 +52,7 @@ public void init(Configuration conf) throws IllegalArgumentException {
       maxAsyncCallPermit = DFS_ROUTER_ASYNC_RPC_MAX_ASYNC_CALL_PERMIT_DEFAULT;
     }
     LOG.info("Max async call permits per nameservice: {}", maxAsyncCallPermit);
-    
+
     // Get all name services configured
     Set<String> allConfiguredNS = FederationUtil.getAllConfiguredNS(conf);
 

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

@@ -260,7 +260,7 @@ private void invokeMethodAsync(
         return handlerAllNamenodeFail(namenodes, method, ioes, params);
       });
     });
-    
+
     asyncFinally(res -> {
       releasePermit(nsid, ugi, method, controller);
       return res;
@@ -576,7 +576,6 @@ public <T extends RemoteLocationContext, R> List<RemoteResult<T, R>> invokeConcu
   protected <T extends RemoteLocationContext, R> List<RemoteResult<T, R>> getRemoteResults(
       RemoteMethod method, long timeOutMs, RouterRpcFairnessPolicyController controller,
       List<T> orderedLocations, List<Callable<Object>> callables) throws IOException {
-    final UserGroupInformation ugi = RouterRpcServer.getRemoteUser();
     final Method m = method.getMethod();
     final CompletableFuture<Object>[] futures =
         new CompletableFuture[callables.size()];
@@ -641,7 +640,7 @@ public <T extends RemoteLocationContext, R> List<RemoteResult<T, R>> invokeSingl
     asyncCatch((o, ioe) -> {
       throw processException(ioe, location);
     }, IOException.class);
-    asyncFinally(o -> { 
+    asyncFinally(o -> {
       return o;
     });
     return asyncReturn(List.class);