YARN-2563. Fixed YarnClient to call getTimeLineDelegationToken only if the Token is not present. Contributed by Zhijie Shen

hadoop-yarn-project/CHANGES.txt

@@ -394,6 +394,9 @@ Release 2.6.0 - UNRELEASED
     YARN-2561. MR job client cannot reconnect to AM after NM restart. (Junping
     Du via jlowe)
 
+    YARN-2563. Fixed YarnClient to call getTimeLineDelegationToken only if the
+    Token is not present. (Zhijie Shen via jianhe)
+
 Release 2.5.1 - 2014-09-05
 
   INCOMPATIBLE CHANGES

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-client/src/main/java/org/apache/hadoop/yarn/client/api/impl/YarnClientImpl.java

@@ -110,7 +110,8 @@ public class YarnClientImpl extends YarnClient {
   private AHSClient historyClient;
   private boolean historyServiceEnabled;
   protected TimelineClient timelineClient;
-  protected Text timelineService;
+  @VisibleForTesting
+  Text timelineService;
   protected boolean timelineServiceEnabled;
 
   private static final String ROOT = "root";
@@ -272,12 +273,6 @@ public class YarnClientImpl extends YarnClient {
 
   private void addTimelineDelegationToken(
       ContainerLaunchContext clc) throws YarnException, IOException {
-    org.apache.hadoop.security.token.Token<TimelineDelegationTokenIdentifier> timelineDelegationToken =
-        timelineClient.getDelegationToken(
-            UserGroupInformation.getCurrentUser().getUserName());
-    if (timelineDelegationToken == null) {
-      return;
-    }
     Credentials credentials = new Credentials();
     DataInputByteBuffer dibb = new DataInputByteBuffer();
     ByteBuffer tokens = clc.getTokens();
@@ -290,11 +285,15 @@ public class YarnClientImpl extends YarnClient {
     // one more
     for (org.apache.hadoop.security.token.Token<? extends TokenIdentifier> token : credentials
         .getAllTokens()) {
-      TokenIdentifier tokenIdentifier = token.decodeIdentifier();
+      if (token.getKind().equals(TimelineDelegationTokenIdentifier.KIND_NAME)) {
-      if (tokenIdentifier instanceof TimelineDelegationTokenIdentifier) {
         return;
       }
     }
+    org.apache.hadoop.security.token.Token<TimelineDelegationTokenIdentifier>
+        timelineDelegationToken = getTimelineDelegationToken();
+    if (timelineDelegationToken == null) {
+      return;
+    }
     credentials.addToken(timelineService, timelineDelegationToken);
     if (LOG.isDebugEnabled()) {
       LOG.debug("Add timline delegation token into credentials: "
@@ -306,6 +305,13 @@ public class YarnClientImpl extends YarnClient {
     clc.setTokens(tokens);
   }
 
+  @VisibleForTesting
+  org.apache.hadoop.security.token.Token<TimelineDelegationTokenIdentifier>
+      getTimelineDelegationToken() throws IOException, YarnException {
+    return timelineClient.getDelegationToken(
+            UserGroupInformation.getCurrentUser().getUserName());
+  }
+
   @Private
   @VisibleForTesting
   protected boolean isSecurityEnabled() {

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-client/src/test/java/org/apache/hadoop/yarn/client/api/impl/TestYarnClient.java

@@ -20,6 +20,8 @@ package org.apache.hadoop.yarn.client.api.impl;
 
 import static org.mockito.Matchers.any;
 import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.never;
+import static org.mockito.Mockito.spy;
 import static org.mockito.Mockito.times;
 import static org.mockito.Mockito.verify;
 import static org.mockito.Mockito.when;
@@ -39,6 +41,7 @@ import org.apache.commons.io.IOUtils;
 import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.io.DataInputByteBuffer;
 import org.apache.hadoop.io.DataOutputBuffer;
+import org.apache.hadoop.io.Text;
 import org.apache.hadoop.security.Credentials;
 import org.apache.hadoop.security.SecurityUtil;
 import org.apache.hadoop.security.UserGroupInformation;
@@ -745,10 +748,13 @@ public class TestYarnClient {
     Configuration conf = new YarnConfiguration();
     conf.setBoolean(YarnConfiguration.TIMELINE_SERVICE_ENABLED, true);
     SecurityUtil.setAuthenticationMethod(AuthenticationMethod.KERBEROS, conf);
+    TimelineDelegationTokenIdentifier timelineDT =
+        new TimelineDelegationTokenIdentifier();
     final Token<TimelineDelegationTokenIdentifier> dToken =
-        new Token<TimelineDelegationTokenIdentifier>();
+        new Token<TimelineDelegationTokenIdentifier>(
+            timelineDT.getBytes(), new byte[0], timelineDT.getKind(), new Text());
     // crate a mock client
-    YarnClientImpl client = new YarnClientImpl() {
+    YarnClientImpl client = spy(new YarnClientImpl() {
       @Override
       protected void serviceInit(Configuration conf) throws Exception {
         if (getConfig().getBoolean(YarnConfiguration.TIMELINE_SERVICE_ENABLED,
@@ -784,22 +790,33 @@ public class TestYarnClient {
       public boolean isSecurityEnabled() {
         return true;
       }
-    };
+    });
     client.init(conf);
     client.start();
+    try {
+      // when i == 0, timeline DT already exists, no need to get one more
+      // when i == 1, timeline DT doesn't exist, need to get one more
+      for (int i = 0; i < 2; ++i) {
         ApplicationSubmissionContext context =
             mock(ApplicationSubmissionContext.class);
-    ApplicationId applicationId = ApplicationId.newInstance(0, 1);
+        ApplicationId applicationId = ApplicationId.newInstance(0, i + 1);
         when(context.getApplicationId()).thenReturn(applicationId);
         DataOutputBuffer dob = new DataOutputBuffer();
         Credentials credentials = new Credentials();
+        if (i == 0) {
+          credentials.addToken(client.timelineService, dToken);
+        }
         credentials.writeTokenStorageToStream(dob);
         ByteBuffer tokens = ByteBuffer.wrap(dob.getData(), 0, dob.getLength());
         ContainerLaunchContext clc = ContainerLaunchContext.newInstance(
             null, null, null, null, tokens, null);
         when(context.getAMContainerSpec()).thenReturn(clc);
         client.submitApplication(context);
-    // Check whether token is added or not
+        if (i == 0) {
+          // GetTimelineDelegationToken shouldn't be called
+          verify(client, never()).getTimelineDelegationToken();
+        }
+        // In either way, token should be there
         credentials = new Credentials();
         DataInputByteBuffer dibb = new DataInputByteBuffer();
         tokens = clc.getTokens();
@@ -812,6 +829,9 @@ public class TestYarnClient {
             credentials.getAllTokens();
         Assert.assertEquals(1, dTokens.size());
         Assert.assertEquals(dToken, dTokens.iterator().next());
+      }
+    } finally {
       client.stop();
     }
+  }
 }