HADOOP-15250. Split-DNS MultiHomed Server Network Cluster Network IPC Client Bind Addr Wrong

Contributed by Ajay Kumar

hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/CommonConfigurationKeys.java

@@ -341,6 +341,10 @@ public class CommonConfigurationKeys extends CommonConfigurationKeysPublic {
   public static final String  IPC_CLIENT_FALLBACK_TO_SIMPLE_AUTH_ALLOWED_KEY = "ipc.client.fallback-to-simple-auth-allowed";
   public static final boolean IPC_CLIENT_FALLBACK_TO_SIMPLE_AUTH_ALLOWED_DEFAULT = false;
 
+  public static final String  IPC_CLIENT_BIND_WILDCARD_ADDR_KEY = "ipc.client"
+      + ".bind.wildcard.addr";
+  public static final boolean IPC_CLIENT_BIND_WILDCARD_ADDR_DEFAULT = false;
+
   public static final String IPC_CLIENT_CONNECT_MAX_RETRIES_ON_SASL_KEY =
     "ipc.client.connect.max.retries.on.sasl";
   public static final int    IPC_CLIENT_CONNECT_MAX_RETRIES_ON_SASL_DEFAULT = 5;

hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/ipc/Client.java

@@ -135,6 +135,7 @@ public class Client implements AutoCloseable {
   private final int connectionTimeout;
 
   private final boolean fallbackAllowed;
+  private final boolean bindToWildCardAddress;
   private final byte[] clientId;
   private final int maxAsyncCalls;
   private final AtomicInteger asyncCallCounter = new AtomicInteger(0);
@@ -674,10 +675,10 @@ public class Client implements AutoCloseable {
               InetAddress localAddr = NetUtils.getLocalInetAddress(host);
               if (localAddr != null) {
                 this.socket.setReuseAddress(true);
-                if (LOG.isDebugEnabled()) {
+                localAddr = NetUtils.bindToLocalAddress(localAddr,
-                  LOG.debug("Binding " + principal + " to " + localAddr);
+                    bindToWildCardAddress);
-                }
+                LOG.debug("Binding {} to {}", principal, localAddr);
-                bindAddr = new InetSocketAddress(localAddr, 0);
+                this.socket.bind(new InetSocketAddress(localAddr, 0));
               }
             }
           }
@@ -1277,6 +1278,13 @@ public class Client implements AutoCloseable {
         CommonConfigurationKeys.IPC_CLIENT_CONNECT_TIMEOUT_DEFAULT);
     this.fallbackAllowed = conf.getBoolean(CommonConfigurationKeys.IPC_CLIENT_FALLBACK_TO_SIMPLE_AUTH_ALLOWED_KEY,
         CommonConfigurationKeys.IPC_CLIENT_FALLBACK_TO_SIMPLE_AUTH_ALLOWED_DEFAULT);
+    this.bindToWildCardAddress = conf
+        .getBoolean(CommonConfigurationKeys.IPC_CLIENT_BIND_WILDCARD_ADDR_KEY,
+            CommonConfigurationKeys.IPC_CLIENT_BIND_WILDCARD_ADDR_DEFAULT);
+    LOG.debug("{} set to true. Will bind client sockets to wildcard "
+            + "address.",
+        CommonConfigurationKeys.IPC_CLIENT_BIND_WILDCARD_ADDR_KEY);
+
     this.clientId = ClientId.getClientId();
     this.sendParamsExecutor = clientExcecutorFactory.refAndGetInstance();
     this.maxAsyncCalls = conf.getInt(

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

@@ -952,4 +952,20 @@ public class NetUtils {
     }
     return port;
   }
+
+  /**
+   * Return an @{@link InetAddress} to bind to. If bindWildCardAddress is true
+   * than returns null.
+   *
+   * @param localAddr
+   * @param bindWildCardAddress
+   * @returns InetAddress
+   */
+  public static InetAddress bindToLocalAddress(InetAddress localAddr, boolean
+      bindWildCardAddress) {
+    if (!bindWildCardAddress) {
+      return localAddr;
+    }
+    return null;
+  }
 }

hadoop-common-project/hadoop-common/src/main/resources/core-default.xml

@@ -3051,4 +3051,12 @@
       System tags to group related properties together.
     </description>
   </property>
+
+  <property>
+    <name>ipc.client.bind.wildcard.addr</name>
+    <value>false</value>
+    <description>When set to true Clients will bind socket to wildcard
+      address. (i.e 0.0.0.0)
+    </description>
+  </property>
 </configuration>

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

@@ -707,6 +707,14 @@ public class TestNetUtils {
     assertEquals(defaultAddr.trim(), NetUtils.getHostPortString(addr));
   }
 
+  @Test
+  public void testBindToLocalAddress() throws Exception {
+    assertNotNull(NetUtils
+        .bindToLocalAddress(NetUtils.getLocalInetAddress("127.0.0.1"), false));
+    assertNull(NetUtils
+        .bindToLocalAddress(NetUtils.getLocalInetAddress("127.0.0.1"), true));
+  }
+
   private <T> void assertBetterArrayEquals(T[] expect, T[]got) {
     String expectStr = StringUtils.join(expect, ", ");
     String gotStr = StringUtils.join(got, ", ");