YARN-11320. Fix CheckStyle.

Author: slfan1989

hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-app/src/main/java/org/apache/hadoop/mapreduce/v2/app/rm/RMContainerAllocator.java

@@ -927,6 +927,11 @@ private void applyConcurrentTaskLimits() {
       int normalMapRequestLimit = Math.min(
           maxRequestedMaps - failedMapRequestLimit,
           numScheduledMaps - numScheduledFailMaps);
+      if (normalMapRequestLimit == 0) {
+        if (numScheduledMaps == 1) {
+          normalMapRequestLimit = 1;
+        }
+      }
       setRequestLimit(PRIORITY_FAST_FAIL_MAP, mapResourceRequest,
           failedMapRequestLimit);
       setRequestLimit(PRIORITY_MAP, mapResourceRequest, normalMapRequestLimit);

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-router/src/test/java/org/apache/hadoop/yarn/server/router/webapp/TestFederationInterceptorREST.java

@@ -1542,13 +1542,13 @@ public void testGetSchedulerInfo() {
     Assert.assertTrue(typeInfo instanceof FederationSchedulerTypeInfo);
 
     FederationSchedulerTypeInfo federationSchedulerTypeInfo =
-        FederationSchedulerTypeInfo.class.cast(typeInfo);
+            FederationSchedulerTypeInfo.class.cast(typeInfo);
     Assert.assertNotNull(federationSchedulerTypeInfo);
     List<SchedulerTypeInfo> schedulerTypeInfos = federationSchedulerTypeInfo.getList();
     Assert.assertNotNull(schedulerTypeInfos);
     Assert.assertEquals(4, schedulerTypeInfos.size());
     List<String> subClusterIds =
-        subClusters.stream().map(subClusterId -> subClusterId.getId()).collect(Collectors.toList());
+            subClusters.stream().map(subClusterId -> subClusterId.getId()).collect(Collectors.toList());
 
     for (SchedulerTypeInfo schedulerTypeInfo : schedulerTypeInfos) {
       Assert.assertNotNull(schedulerTypeInfo);
@@ -1562,7 +1562,7 @@ public void testGetSchedulerInfo() {
       Assert.assertNotNull(schedulerInfo);
       Assert.assertTrue(schedulerInfo instanceof CapacitySchedulerInfo);
       CapacitySchedulerInfo capacitySchedulerInfo =
-          CapacitySchedulerInfo.class.cast(schedulerInfo);
+              CapacitySchedulerInfo.class.cast(schedulerInfo);
       Assert.assertNotNull(capacitySchedulerInfo);
 
       // 3. The parent queue name should be root
@@ -1582,14 +1582,15 @@ public void testGetSchedulerInfo() {
       CapacitySchedulerQueueInfoList csSchedulerQueueInfoList = capacitySchedulerInfo.getQueues();
       Assert.assertNotNull(csSchedulerQueueInfoList);
       List<CapacitySchedulerQueueInfo> csQueueInfoList =
-          csSchedulerQueueInfoList.getQueueInfoList();
+              csSchedulerQueueInfoList.getQueueInfoList();
       Assert.assertEquals(2, csQueueInfoList.size());
       for (CapacitySchedulerQueueInfo csQueueInfo : csQueueInfoList) {
         Assert.assertNotNull(csQueueInfo);
         Assert.assertTrue(queues.contains(csQueueInfo.getQueuePath()));
       }
     }
-  
+  }
+
   @Test
   public void testPostDelegationTokenErrorHsr() throws Exception {
     // Prepare delegationToken data