svn merge -c 1379615 FIXES: HDFS-3873. Hftp assumes security is disabled if token fetch fails (daryn)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1379618 13f79535-47bb-0310-9956-ffa450edef68

hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt

@@ -1449,6 +1449,8 @@ Release 0.23.3 - UNRELEASED
 
     HDFS-3861. Deadlock in DFSClient (Kihwal Lee via daryn)
 
+    HDFS-3873. Hftp assumes security is disabled if token fetch fails (daryn)
+
 Release 0.23.2 - UNRELEASED
 
   INCOMPATIBLE CHANGES

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/HftpFileSystem.java

@@ -21,6 +21,7 @@ package org.apache.hadoop.hdfs;
 import java.io.FileNotFoundException;
 import java.io.IOException;
 import java.io.InputStream;
+import java.net.ConnectException;
 import java.net.HttpURLConnection;
 import java.net.InetSocketAddress;
 import java.net.URI;
@@ -247,14 +248,13 @@ public class HftpFileSystem extends FileSystem
           Credentials c;
           try {
             c = DelegationTokenFetcher.getDTfromRemote(nnHttpUrl, renewer);
-          } catch (Exception e) {
+          } catch (IOException e) {
-            LOG.info("Couldn't get a delegation token from " + nnHttpUrl + 
+            if (e.getCause() instanceof ConnectException) {
-            " using http.");
+              LOG.warn("Couldn't connect to " + nnHttpUrl +
-            if(LOG.isDebugEnabled()) {
+                  ", assuming security is disabled");
-              LOG.debug("error was ", e);
+              return null;
             }
-            //Maybe the server is in unsecure mode (that's bad but okay)
+            throw e;
-            return null;
           }
           for (Token<? extends TokenIdentifier> t : c.getAllTokens()) {
             if(LOG.isDebugEnabled()) {

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestHftpDelegationToken.java

@@ -19,13 +19,11 @@
 package org.apache.hadoop.hdfs;
 
 import static org.apache.hadoop.fs.CommonConfigurationKeysPublic.HADOOP_SECURITY_AUTHENTICATION;
-import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.*;
-import static org.junit.Assert.assertNotNull;
-import static org.junit.Assert.assertNull;
-import static org.junit.Assert.assertSame;
-
 import java.io.IOException;
 import java.lang.reflect.Field;
+import java.net.ServerSocket;
+import java.net.Socket;
 import java.net.URI;
 import java.security.PrivilegedExceptionAction;
 
@@ -138,6 +136,53 @@ public class TestHftpDelegationToken {
     conf.setInt(DFSConfigKeys.DFS_NAMENODE_HTTPS_PORT_KEY, 5);
   }
   
+
+  @Test
+  public void testInsecureRemoteCluster()  throws Exception {
+    final ServerSocket socket = new ServerSocket(0); // just reserve a port
+    socket.close();
+    Configuration conf = new Configuration();
+    URI fsUri = URI.create("hsftp://localhost:"+socket.getLocalPort());
+    assertNull(FileSystem.newInstance(fsUri, conf).getDelegationToken(null));
+  }
+
+  @Test
+  public void testSecureClusterError()  throws Exception {
+    final ServerSocket socket = new ServerSocket(0);
+    Thread t = new Thread() {
+      @Override
+      public void run() {
+        while (true) { // fetching does a few retries
+          try {
+            Socket s = socket.accept();
+            s.getOutputStream().write(1234);
+            s.shutdownOutput();
+          } catch (Exception e) {
+            break;
+          }
+        }
+      }
+    };
+    t.start();
+
+    try {
+      Configuration conf = new Configuration();
+      URI fsUri = URI.create("hsftp://localhost:"+socket.getLocalPort());
+      Exception ex = null;
+      try {
+        FileSystem.newInstance(fsUri, conf).getDelegationToken(null);
+      } catch (Exception e) {
+        ex = e;
+      }
+      assertNotNull(ex);
+      assertNotNull(ex.getCause());
+      assertEquals("Unexpected end of file from server",
+                   ex.getCause().getMessage());
+    } finally {
+      t.interrupt();
+    }
+  }
+  
   private void checkTokenSelection(HftpFileSystem fs,
                                    int port,
                                    Configuration conf) throws IOException {