HDFS-5448. Fix break caused by previous checkin for HDFS-5448.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/HDFS-2832@1538655 13f79535-47bb-0310-9956-ffa450edef68

hadoop-hdfs-project/hadoop-hdfs/CHANGES_HDFS-2832.txt

@@ -65,3 +65,6 @@ IMPROVEMENTS:
     HDFS-5448. Datanode should generate its ID on first registration. (Arpit
     Agarwal)
 
+    HDFS-5448. Fix break caused by previous checkin for HDFS-5448. (Arpit
+    Agarwal)
+

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

@@ -331,7 +331,8 @@ class BPOfferService {
     }
   }
 
-  synchronized DatanodeRegistration createRegistration() {
+  synchronized DatanodeRegistration createRegistration()
+      throws IOException {
     Preconditions.checkState(bpNSInfo != null,
         "getRegistration() can only be called after initial handshake");
     return dn.createBPRegistration(bpNSInfo);