HDFS-12430. Rebasing HDFS-10467 After HDFS-12269 and HDFS-12218. Contributed by Inigo Goiri.

(cherry picked from commit 3302e792d469b7e8f3bfa10151e4e1c546589734)

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

@@ -66,7 +66,6 @@ import org.apache.hadoop.hdfs.DFSUtil;
 import org.apache.hadoop.hdfs.inotify.EventBatchList;
 import org.apache.hadoop.hdfs.protocol.AddECPolicyResponse;
 import org.apache.hadoop.hdfs.protocol.BlockStoragePolicy;
-import org.apache.hadoop.hdfs.protocol.BlocksStats;
 import org.apache.hadoop.hdfs.protocol.CacheDirectiveEntry;
 import org.apache.hadoop.hdfs.protocol.CacheDirectiveInfo;
 import org.apache.hadoop.hdfs.protocol.CachePoolEntry;
@@ -76,7 +75,7 @@ import org.apache.hadoop.hdfs.protocol.CorruptFileBlocks;
 import org.apache.hadoop.hdfs.protocol.DatanodeID;
 import org.apache.hadoop.hdfs.protocol.DatanodeInfo;
 import org.apache.hadoop.hdfs.protocol.DirectoryListing;
-import org.apache.hadoop.hdfs.protocol.ECBlockGroupsStats;
+import org.apache.hadoop.hdfs.protocol.ECBlockGroupStats;
 import org.apache.hadoop.hdfs.protocol.EncryptionZone;
 import org.apache.hadoop.hdfs.protocol.ErasureCodingPolicy;
 import org.apache.hadoop.hdfs.protocol.ExtendedBlock;
@@ -89,6 +88,7 @@ import org.apache.hadoop.hdfs.protocol.LastBlockWithStatus;
 import org.apache.hadoop.hdfs.protocol.LocatedBlock;
 import org.apache.hadoop.hdfs.protocol.LocatedBlocks;
 import org.apache.hadoop.hdfs.protocol.OpenFileEntry;
+import org.apache.hadoop.hdfs.protocol.ReplicatedBlockStats;
 import org.apache.hadoop.hdfs.protocol.RollingUpgradeInfo;
 import org.apache.hadoop.hdfs.protocol.SnapshotDiffReport;
 import org.apache.hadoop.hdfs.protocol.SnapshottableDirectoryStatus;
@@ -1879,19 +1879,19 @@ public class RouterRpcServer extends AbstractService implements ClientProtocol {
   }
 
   @Override
-  public ECBlockGroupsStats getECBlockGroupsStats() throws IOException {
+  public ECBlockGroupStats getECBlockGroupStats() throws IOException {
     checkOperation(OperationCategory.READ, false);
     return null;
   }
 
   @Override
-  public HashMap<String, String> getErasureCodingCodecs() throws IOException {
+  public Map<String, String> getErasureCodingCodecs() throws IOException {
     checkOperation(OperationCategory.READ, false);
     return null;
   }
 
   @Override
-  public BlocksStats getBlocksStats() throws IOException {
+  public ReplicatedBlockStats getReplicatedBlockStats() throws IOException {
     checkOperation(OperationCategory.READ, false);
     return null;
   }