HADOOP-8372. NetUtils.normalizeHostName() incorrectly handles hostname starting with a numeric character. Contributed by Junping Du.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1336446 13f79535-47bb-0310-9956-ffa450edef68

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

@@ -432,6 +432,9 @@ Release 2.0.0 - UNRELEASED
     HADOOP-8359. Fix javadoc warnings in Configuration.  (Anupam Seth via
     szetszwo)
 
+    HADOOP-8372. NetUtils.normalizeHostName() incorrectly handles hostname
+    starting with a numeric character. (Junping Du via suresh)
+
   BREAKDOWN OF HADOOP-7454 SUBTASKS
 
     HADOOP-7455. HA: Introduce HA Service Protocol Interface. (suresh)

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

@@ -494,7 +494,7 @@ public class NetUtils {
    * also takes a local address and port to bind the socket to. 
    * 
    * @param socket
-   * @param address the remote address
+   * @param endpoint the remote address
    * @param localAddr the local address to bind the socket to
    * @param timeout timeout in milliseconds
    */
@@ -549,16 +549,11 @@ public class NetUtils {
    * @return its IP address in the string format
    */
   public static String normalizeHostName(String name) {
-    if (Character.digit(name.charAt(0), 10) != -1) { // it is an IP
+    try {
+      return InetAddress.getByName(name).getHostAddress();
+    } catch (UnknownHostException e) {
       return name;
-    } else {
-      try {
-        InetAddress ipAddress = InetAddress.getByName(name);
-        return ipAddress.getHostAddress();
-      } catch (UnknownHostException e) {
-        return name;
-      }
-    }
+    }    
   }
   
   /** 

hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/net/TestNetUtils.java

@@ -31,7 +31,9 @@ import java.net.SocketException;
 import java.net.SocketTimeoutException;
 import java.net.URI;
 import java.net.UnknownHostException;
+import java.util.Arrays;
 import java.util.Enumeration;
+import java.util.List;
 import java.util.concurrent.TimeUnit;
 
 import junit.framework.AssertionFailedError;
@@ -42,8 +44,6 @@ import org.apache.commons.logging.LogFactory;
 import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.io.IOUtils;
 import org.apache.hadoop.security.NetUtilsTestResolver;
-import org.apache.hadoop.test.MultithreadedTestUtil.TestContext;
-import org.apache.hadoop.test.MultithreadedTestUtil.TestingThread;
 import org.junit.Assume;
 import org.junit.Before;
 import org.junit.BeforeClass;
@@ -599,6 +599,26 @@ public class TestNetUtils {
     assertEquals("scheme://host.a.b/path", uri.toString());
   }
   
+  /** 
+   * Test for {@link NetUtils#normalizeHostNames}
+   */
+  @Test
+  public void testNormalizeHostName() {	
+    List<String> hosts = Arrays.asList(new String[] {"127.0.0.1",
+        "localhost", "3w.org", "UnknownHost"});
+    List<String> normalizedHosts = NetUtils.normalizeHostNames(hosts);
+    // when ipaddress is normalized, same address is expected in return
+    assertEquals(normalizedHosts.get(0), hosts.get(0));
+    // for normalizing a resolvable hostname, resolved ipaddress is expected in return
+    assertFalse(normalizedHosts.get(1).equals(hosts.get(1)));
+    assertEquals(normalizedHosts.get(1), hosts.get(0));
+    // this address HADOOP-8372: when normalizing a valid resolvable hostname start with numeric, 
+    // its ipaddress is expected to return
+    assertFalse(normalizedHosts.get(2).equals(hosts.get(2)));
+    // return the same hostname after normalizing a irresolvable hostname.
+    assertEquals(normalizedHosts.get(3), hosts.get(3));
+  }
+  
   @Test
   public void testGetHostNameOfIP() {
     assertNull(NetUtils.getHostNameOfIP(null));

hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/net/TestTableMapping.java

@@ -41,7 +41,7 @@ public class TestTableMapping {
   public void setUp() throws IOException {
     mappingFile = File.createTempFile(getClass().getSimpleName(), ".txt");
     Files.write("a.b.c /rack1\n" +
-                "1.2.3\t/rack2\n", mappingFile, Charsets.UTF_8);
+                "1.2.3.4\t/rack2\n", mappingFile, Charsets.UTF_8);
     mappingFile.deleteOnExit();
   }
 
@@ -55,7 +55,7 @@ public class TestTableMapping {
 
     List<String> names = new ArrayList<String>();
     names.add("a.b.c");
-    names.add("1.2.3");
+    names.add("1.2.3.4");
 
     List<String> result = mapping.resolve(names);
     assertEquals(names.size(), result.size());
@@ -73,7 +73,7 @@ public class TestTableMapping {
 
     List<String> names = new ArrayList<String>();
     names.add("a.b.c");
-    names.add("1.2.3");
+    names.add("1.2.3.4");
 
     List<String> result1 = mapping.resolve(names);
     assertEquals(names.size(), result1.size());
@@ -96,7 +96,7 @@ public class TestTableMapping {
 
     List<String> names = new ArrayList<String>();
     names.add("a.b.c");
-    names.add("1.2.3");
+    names.add("1.2.3.4");
 
     List<String> result = mapping.resolve(names);
     assertEquals(names.size(), result.size());
@@ -114,7 +114,7 @@ public class TestTableMapping {
 
     List<String> names = new ArrayList<String>();
     names.add("a.b.c");
-    names.add("1.2.3");
+    names.add("1.2.3.4");
 
     List<String> result = mapping.resolve(names);
     assertEquals(names.size(), result.size());
@@ -134,7 +134,7 @@ public class TestTableMapping {
 
     List<String> names = new ArrayList<String>();
     names.add("a.b.c");
-    names.add("1.2.3");
+    names.add("1.2.3.4");
 
     List<String> result = mapping.resolve(names);
     assertEquals(names.size(), result.size());