Merge r1595116 from trunk. YARN-2053. Fixed a bug in AMS to not add null NMToken into NMTokens list from previous attempts for work-preserving AM restart. Contributed by Wangda Tan

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1595117 13f79535-47bb-0310-9956-ffa450edef68

hadoop-yarn-project/CHANGES.txt

@@ -70,6 +70,9 @@ Release 2.5.0 - UNRELEASED
     YARN-1981. Nodemanager version is not updated when a node reconnects (Jason
     Lowe via jeagles)
 
+    YARN-2053. Fixed a bug in AMS to not add null NMToken into NMTokens list from
+    previous attempts for work-preserving AM restart. (Wangda Tan via jianhe)
+
   OPTIMIZATIONS
 
   BUG FIXES 

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/ApplicationMasterService.java

@@ -298,9 +298,12 @@ public RegisterApplicationMasterResponse registerApplicationMaster(
         List<NMToken> nmTokens = new ArrayList<NMToken>();
         for (Container container : transferredContainers) {
           try {
-            nmTokens.add(rmContext.getNMTokenSecretManager()
+            NMToken token = rmContext.getNMTokenSecretManager()
                 .createAndGetNMToken(app.getUser(), applicationAttemptId,
-                container));
+                    container);
+            if (null != token) {
+              nmTokens.add(token);
+            }
           } catch (IllegalArgumentException e) {
             // if it's a DNS issue, throw UnknowHostException directly and that
             // will be automatically retried by RMProxy in RPC layer.

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/test/java/org/apache/hadoop/yarn/server/resourcemanager/applicationsmanager/TestAMRestart.java

@@ -264,30 +264,35 @@ public void testNMTokensRebindOnAMRestart() throws Exception {
     nm2.registerNode();
     MockAM am1 = MockRM.launchAndRegisterAM(app1, rm1, nm1);
 
-    int NUM_CONTAINERS = 1;
     List<Container> containers = new ArrayList<Container>();
     // nmTokens keeps track of all the nmTokens issued in the allocate call.
     List<NMToken> expectedNMTokens = new ArrayList<NMToken>();
 
-    // am1 allocate 1 container on nm1.
+    // am1 allocate 2 container on nm1.
+    // first container
     while (true) {
       AllocateResponse response =
-          am1.allocate("127.0.0.1", 2000, NUM_CONTAINERS,
+          am1.allocate("127.0.0.1", 2000, 2,
             new ArrayList<ContainerId>());
       nm1.nodeHeartbeat(true);
       containers.addAll(response.getAllocatedContainers());
       expectedNMTokens.addAll(response.getNMTokens());
-      if (containers.size() == NUM_CONTAINERS) {
+      if (containers.size() == 2) {
         break;
       }
       Thread.sleep(200);
       System.out.println("Waiting for container to be allocated.");
     }
-    // launch the container
+    // launch the container-2
     nm1.nodeHeartbeat(am1.getApplicationAttemptId(), 2, ContainerState.RUNNING);
     ContainerId containerId2 =
         ContainerId.newInstance(am1.getApplicationAttemptId(), 2);
     rm1.waitForState(nm1, containerId2, RMContainerState.RUNNING);
+    // launch the container-3
+    nm1.nodeHeartbeat(am1.getApplicationAttemptId(), 3, ContainerState.RUNNING);
+    ContainerId containerId3 =
+        ContainerId.newInstance(am1.getApplicationAttemptId(), 3);
+    rm1.waitForState(nm1, containerId3, RMContainerState.RUNNING);
     
     // fail am1
     nm1.nodeHeartbeat(am1.getApplicationAttemptId(), 1, ContainerState.COMPLETE);
@@ -308,12 +313,12 @@ public void testNMTokensRebindOnAMRestart() throws Exception {
     containers = new ArrayList<Container>();
     while (true) {
       AllocateResponse allocateResponse =
-          am2.allocate("127.1.1.1", 4000, NUM_CONTAINERS,
+          am2.allocate("127.1.1.1", 4000, 1,
             new ArrayList<ContainerId>());
       nm2.nodeHeartbeat(true);
       containers.addAll(allocateResponse.getAllocatedContainers());
       expectedNMTokens.addAll(allocateResponse.getNMTokens());
-      if (containers.size() == NUM_CONTAINERS) {
+      if (containers.size() == 1) {
         break;
       }
       Thread.sleep(200);