HDFS-9276. Failed to Update HDFS Delegation Token for long running application in HA mode. Contributed by Liangliang Gu and John Zhuge

hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/security/Credentials.java

@@ -95,10 +95,24 @@ public class Credentials implements Writable {
    * @param t the token object
    */
   public void addToken(Text alias, Token<? extends TokenIdentifier> t) {
-    if (t != null) {
-      tokenMap.put(alias, t);
-    } else {
+    if (t == null) {
       LOG.warn("Null token ignored for " + alias);
+    } else if (tokenMap.put(alias, t) != null) {
+      // Update private tokens
+      Map<Text, Token<? extends TokenIdentifier>> tokensToAdd =
+          new HashMap<>();
+      for (Map.Entry<Text, Token<? extends TokenIdentifier>> e :
+          tokenMap.entrySet()) {
+        Token<? extends TokenIdentifier> token = e.getValue();
+        if (token instanceof Token.PrivateToken &&
+            ((Token.PrivateToken) token).getPublicService().equals(alias)) {
+          Token<? extends TokenIdentifier> privateToken =
+              new Token.PrivateToken<>(t);
+          privateToken.setService(token.getService());
+          tokensToAdd.put(e.getKey(), privateToken);
+        }
+      }
+      tokenMap.putAll(tokensToAdd);
     }
   }
 
@@ -397,7 +411,7 @@ public class Credentials implements Writable {
     for(Map.Entry<Text, Token<?>> token: other.tokenMap.entrySet()){
       Text key = token.getKey();
       if (!tokenMap.containsKey(key) || overwrite) {
-        tokenMap.put(key, token.getValue());
+        addToken(key, token.getValue());
       }
     }
   }

hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/security/token/Token.java

@@ -96,10 +96,10 @@ public class Token<T extends TokenIdentifier> implements Writable {
    * @param other the token to clone
    */
   public Token(Token<T> other) {
-    this.identifier = other.identifier;
-    this.password = other.password;
-    this.kind = other.kind;
-    this.service = other.service;
+    this.identifier = other.identifier.clone();
+    this.password = other.password.clone();
+    this.kind = new Text(other.kind);
+    this.service = new Text(other.service);
   }
 
   public Token<T> copyToken() {
@@ -230,8 +230,37 @@ public class Token<T extends TokenIdentifier> implements Writable {
   @InterfaceAudience.Private
   @InterfaceStability.Unstable
   public static class PrivateToken<T extends TokenIdentifier> extends Token<T> {
+    final private Text publicService;
+
     public PrivateToken(Token<T> token) {
       super(token);
+      publicService = new Text(token.getService());
+    }
+
+    public Text getPublicService() {
+      return publicService;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+      if (this == o) {
+        return true;
+      }
+      if (o == null || getClass() != o.getClass()) {
+        return false;
+      }
+      if (!super.equals(o)) {
+        return false;
+      }
+      PrivateToken<?> that = (PrivateToken<?>) o;
+      return publicService.equals(that.publicService);
+    }
+
+    @Override
+    public int hashCode() {
+      int result = super.hashCode();
+      result = 31 * result + publicService.hashCode();
+      return result;
     }
   }
 

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/ha/TestDelegationTokensWithHA.java

@@ -24,6 +24,7 @@ import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.fs.AbstractFileSystem;
 import org.apache.hadoop.fs.CommonConfigurationKeysPublic;
 import org.apache.hadoop.fs.FileSystem;
+import org.apache.hadoop.fs.Path;
 import org.apache.hadoop.ha.HAServiceProtocol.HAServiceState;
 import org.apache.hadoop.hdfs.*;
 import org.apache.hadoop.hdfs.protocol.HdfsConstants;
@@ -367,6 +368,37 @@ public class TestDelegationTokensWithHA {
     token.cancel(conf);
   }
 
+  @Test(timeout = 300000)
+  public void testCancelAndUpdateDelegationTokens() throws Exception {
+    // Create UGI with token1
+    String user = UserGroupInformation.getCurrentUser().getShortUserName();
+    UserGroupInformation ugi1 = UserGroupInformation.createRemoteUser(user);
+
+    ugi1.doAs(new PrivilegedExceptionAction<Void>() {
+      public Void run() throws Exception {
+        final Token<DelegationTokenIdentifier> token1 =
+            getDelegationToken(fs, "JobTracker");
+        UserGroupInformation.getCurrentUser()
+            .addToken(token1.getService(), token1);
+
+        FileSystem fs1 = HATestUtil.configureFailoverFs(cluster, conf);
+
+        // Cancel token1
+        doRenewOrCancel(token1, conf, TokenTestAction.CANCEL);
+
+        // Update UGI with token2
+        final Token<DelegationTokenIdentifier> token2 =
+            getDelegationToken(fs, "JobTracker");
+        UserGroupInformation.getCurrentUser()
+            .addToken(token2.getService(), token2);
+
+        // Check whether token2 works
+        fs1.listFiles(new Path("/"), false);
+        return null;
+      }
+    });
+  }
+
   @SuppressWarnings("unchecked")
   private Token<DelegationTokenIdentifier> getDelegationToken(FileSystem fs,
       String renewer) throws IOException {