fix checkstyles

Author: tomscut

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/impl/FsDatasetImpl.java

@@ -3669,9 +3669,5 @@ void stopAllDataxceiverThreads(FsVolumeImpl volume) {
       }
     }
   }
-
-  public FsVolumeList getVolumes() {
-    return volumes;
-  }
 }
 

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/metrics/DataNodeDiskMetrics.java

@@ -147,7 +147,8 @@ public void run() {
             // Sort the slow disks by latency.
             if (maxSlowDisksToBeExcluded > 0) {
               ArrayList<DiskLatency> diskLatencies = new ArrayList<>();
-              for (Map.Entry<String, Map<DiskOp, Double>> diskStats : diskOutliersStats.entrySet()) {
+              for (Map.Entry<String, Map<DiskOp, Double>> diskStats :
+                  diskOutliersStats.entrySet()) {
                 diskLatencies.add(new DiskLatency(diskStats.getKey(), diskStats.getValue()));
               }
               sortSlowDisks(diskLatencies);

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/impl/TestFsVolumeList.java

@@ -31,7 +31,6 @@
 import org.apache.hadoop.hdfs.HdfsConfiguration;
 import org.apache.hadoop.hdfs.MiniDFSCluster;
 import org.apache.hadoop.hdfs.MiniDFSNNTopology;
-import org.apache.hadoop.hdfs.protocol.DatanodeVolumeInfo;
 import org.apache.hadoop.hdfs.server.common.Storage.StorageDirectory;
 import org.apache.hadoop.hdfs.server.datanode.BlockScanner;
 import org.apache.hadoop.hdfs.server.datanode.DataNode;