YARN-6585. RM fails to start when upgrading from 2.7 for clusters with node labels. Contributed by Sunil G.

(cherry picked from commit 5578af860335ae44c9780082508c3dcf726f60fc)

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-common/src/main/java/org/apache/hadoop/yarn/server/api/protocolrecords/impl/pb/AddToClusterNodeLabelsRequestPBImpl.java

@@ -111,6 +111,13 @@ public class AddToClusterNodeLabelsRequestPBImpl extends
     for (NodeLabelProto r : attributesProtoList) {
       this.updatedNodeLabels.add(convertFromProtoFormat(r));
     }
+
+    if (this.updatedNodeLabels.isEmpty()) {
+      List<String> deprecatedLabelsList = p.getDeprecatedNodeLabelsList();
+      for (String l : deprecatedLabelsList) {
+        this.updatedNodeLabels.add(NodeLabel.newInstance(l));
+      }
+    }
   }
 
   private NodeLabel convertFromProtoFormat(NodeLabelProto p) {

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

@@ -26,7 +26,9 @@ import java.io.File;
 import java.io.FileOutputStream;
 import java.io.IOException;
 import java.io.PrintWriter;
+import java.net.InetSocketAddress;
 import java.util.ArrayList;
+import java.util.Arrays;
 import java.util.List;
 import java.util.Map;
 import java.util.Set;
@@ -46,12 +48,17 @@ import org.apache.hadoop.security.UserGroupInformation;
 import org.apache.hadoop.security.authorize.AccessControlList;
 import org.apache.hadoop.security.authorize.ProxyUsers;
 import org.apache.hadoop.security.authorize.ServiceAuthorizationManager;
+import org.apache.hadoop.yarn.api.ApplicationClientProtocol;
+import org.apache.hadoop.yarn.api.protocolrecords.GetClusterNodeLabelsRequest;
+import org.apache.hadoop.yarn.api.protocolrecords.GetClusterNodeLabelsResponse;
 import org.apache.hadoop.yarn.api.records.DecommissionType;
 import org.apache.hadoop.yarn.api.records.NodeId;
+import org.apache.hadoop.yarn.api.records.NodeLabel;
 import org.apache.hadoop.yarn.api.records.Resource;
 import org.apache.hadoop.yarn.conf.HAUtil;
 import org.apache.hadoop.yarn.conf.YarnConfiguration;
 import org.apache.hadoop.yarn.exceptions.YarnException;
+import org.apache.hadoop.yarn.server.api.protocolrecords.AddToClusterNodeLabelsRequest;
 import org.apache.hadoop.yarn.server.api.protocolrecords.RefreshAdminAclsRequest;
 import org.apache.hadoop.yarn.server.api.protocolrecords.RefreshClusterMaxPriorityRequest;
 import org.apache.hadoop.yarn.server.api.protocolrecords.RefreshNodesRequest;
@@ -62,6 +69,7 @@ import org.apache.hadoop.yarn.server.api.protocolrecords.RefreshSuperUserGroupsC
 import org.apache.hadoop.yarn.server.api.protocolrecords.RefreshUserToGroupsMappingsRequest;
 import org.apache.hadoop.yarn.server.api.protocolrecords.RemoveFromClusterNodeLabelsRequest;
 import org.apache.hadoop.yarn.server.api.protocolrecords.ReplaceLabelsOnNodeRequest;
+import org.apache.hadoop.yarn.server.api.protocolrecords.impl.pb.AddToClusterNodeLabelsRequestPBImpl;
 import org.apache.hadoop.yarn.server.resourcemanager.nodelabels.RMNodeLabelsManager;
 import org.apache.hadoop.yarn.server.resourcemanager.resource.DynamicResourceConfiguration;
 import org.apache.hadoop.yarn.server.resourcemanager.rmnode.RMNode;
@@ -79,6 +87,9 @@ import org.junit.Test;
 import com.google.common.collect.ImmutableMap;
 import com.google.common.collect.ImmutableSet;
 import org.apache.hadoop.yarn.exceptions.YarnRuntimeException;
+import org.apache.hadoop.yarn.ipc.YarnRPC;
+import org.apache.hadoop.yarn.proto.YarnServerResourceManagerServiceProtos.AddToClusterNodeLabelsRequestProto;
+
 import static org.junit.Assert.assertTrue;
 
 public class TestRMAdminService {
@@ -1463,4 +1474,52 @@ public class TestRMAdminService {
           e.getMessage().startsWith(HAUtil.BAD_CONFIG_MESSAGE_PREFIX));
     }
   }
+
+  @Test(timeout = 30000)
+  public void testAdminAddToClusterNodeLabelsWithDeprecatedAPIs()
+      throws Exception, YarnException {
+    configuration.set(YarnConfiguration.RM_CONFIGURATION_PROVIDER_CLASS,
+        "org.apache.hadoop.yarn.FileSystemBasedConfigurationProvider");
+
+    uploadDefaultConfiguration();
+
+    rm = new MockRM(configuration) {
+      protected ClientRMService createClientRMService() {
+        return new ClientRMService(this.rmContext, scheduler, this.rmAppManager,
+            this.applicationACLsManager, this.queueACLsManager,
+            this.getRMContext().getRMDelegationTokenSecretManager());
+      };
+    };
+    rm.init(configuration);
+    rm.start();
+
+    try {
+      List<String> list = new ArrayList<String>();
+      list.add("a");
+      list.add("b");
+      AddToClusterNodeLabelsRequestProto proto = AddToClusterNodeLabelsRequestProto
+          .newBuilder().addAllDeprecatedNodeLabels(list).build();
+      AddToClusterNodeLabelsRequestPBImpl protoImpl = new AddToClusterNodeLabelsRequestPBImpl(
+          proto);
+      rm.adminService
+          .addToClusterNodeLabels((AddToClusterNodeLabelsRequest) protoImpl);
+    } catch (Exception ex) {
+      fail("Could not update node labels." + ex);
+    }
+
+    // Create a client.
+    Configuration conf = new Configuration();
+    YarnRPC rpc = YarnRPC.create(conf);
+    InetSocketAddress rmAddress = rm.getClientRMService().getBindAddress();
+    ApplicationClientProtocol client = (ApplicationClientProtocol) rpc
+        .getProxy(ApplicationClientProtocol.class, rmAddress, conf);
+
+    // Get node labels collection
+    GetClusterNodeLabelsResponse response = client
+        .getClusterNodeLabels(GetClusterNodeLabelsRequest.newInstance());
+    NodeLabel labelX = NodeLabel.newInstance("a");
+    NodeLabel labelY = NodeLabel.newInstance("b");
+    Assert.assertTrue(
+        response.getNodeLabelList().containsAll(Arrays.asList(labelX, labelY)));
+  }
 }

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/test/java/org/apache/hadoop/yarn/server/resourcemanager/nodelabels/TestRMNodeLabelsManager.java

@@ -24,6 +24,7 @@ import static org.mockito.Mockito.mock;
 import static org.mockito.Mockito.when;
 
 import java.io.File;
+import java.io.FileOutputStream;
 import java.io.IOException;
 import java.util.Arrays;
 import java.util.Collection;
@@ -704,4 +705,52 @@ public class TestRMNodeLabelsManager extends NodeLabelTestBase {
     assertLabelsToNodesEquals(
         mgr.getLabelsToNodes(), transposeNodeToLabels(mgr.getNodeLabels()));
   }
+
+  @Test(timeout = 60000)
+  public void testBackwardsCompatableMirror() throws Exception {
+    lmgr = new RMNodeLabelsManager();
+    Configuration conf = new Configuration();
+    File tempDir = File.createTempFile("nlb", ".tmp");
+    tempDir.delete();
+    tempDir.mkdirs();
+    tempDir.deleteOnExit();
+    String tempDirName = tempDir.getAbsolutePath();
+    conf.set(YarnConfiguration.FS_NODE_LABELS_STORE_ROOT_DIR, tempDirName);
+
+    // The following are the contents of a 2.7-formatted levelDB file to be
+    // placed in nodelabel.mirror. There are 3 labels: 'a', 'b', and 'c'.
+    // host1 is labeled with 'a', host2 is labeled with 'b', and c is not
+    // associated with a node.
+    byte[] contents =
+      {
+          0x09, 0x0A, 0x01, 0x61, 0x0A, 0x01, 0x62, 0x0A, 0x01, 0x63, 0x20,
+          0x0A, 0x0E, 0x0A, 0x09, 0x0A, 0x05, 0x68, 0x6F, 0x73, 0x74, 0x32,
+          0x10, 0x00, 0x12, 0x01, 0x62, 0x0A, 0x0E, 0x0A, 0x09, 0x0A, 0x05,
+          0x68, 0x6F, 0x73, 0x74, 0x31, 0x10, 0x00, 0x12, 0x01, 0x61
+      };
+    File file = new File(tempDirName + "/nodelabel.mirror");
+    file.createNewFile();
+    FileOutputStream stream = new FileOutputStream(file);
+    stream.write(contents);
+    stream.close();
+
+    conf.setBoolean(YarnConfiguration.NODE_LABELS_ENABLED, true);
+    conf.set(YarnConfiguration.RM_SCHEDULER,
+        "org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.CapacityScheduler");
+    Configuration withQueueLabels = getConfigurationWithQueueLabels(conf);
+
+    MockRM rm = initRM(withQueueLabels);
+    Set<String> labelNames = lmgr.getClusterNodeLabelNames();
+    Map<String, Set<NodeId>> labeledNodes = lmgr.getLabelsToNodes();
+
+    Assert.assertTrue(labelNames.contains("a"));
+    Assert.assertTrue(labelNames.contains("b"));
+    Assert.assertTrue(labelNames.contains("c"));
+    Assert.assertTrue(labeledNodes.get("a")
+        .contains(NodeId.newInstance("host1", 0)));
+    Assert.assertTrue(labeledNodes.get("b")
+        .contains(NodeId.newInstance("host2", 0)));
+
+    rm.stop();
+  }
 }