HADOOP-9369. DNS#reverseDns() can return hostname with . appended at the end. Contributed by Karthik Kambatla.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1454172 13f79535-47bb-0310-9956-ffa450edef68

hadoop-common-project/hadoop-common/CHANGES.txt

@@ -547,6 +547,9 @@ Release 2.0.4-alpha - UNRELEASED
 
   BUG FIXES
 
+    HADOOP-9369. DNS#reverseDns() can return hostname with . appended at the
+    end. (Karthik Kambatla via atm)
+
 Release 2.0.3-alpha - 2013-02-06 
 
   INCOMPATIBLE CHANGES

hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/net/DNS.java

@@ -89,7 +89,12 @@ public class DNS {
       ictx.close();
     }
 
-    return attribute.get("PTR").get().toString();
+    String hostname = attribute.get("PTR").get().toString();
+    int hostnameLength = hostname.length();
+    if (hostname.charAt(hostnameLength - 1) == '.') {
+      hostname = hostname.substring(0, hostnameLength - 1);
+    }
+    return hostname;
   }
 
   /**