HDDS-1663. Add datanode to network topology cluster during node regis…

hadoop-hdds/common/src/main/java/org/apache/hadoop/hdds/scm/net/Node.java

@@ -32,11 +32,23 @@ public interface Node {
    *  exclude itself. In another words, its parent's full network location */
   String getNetworkLocation();
 
+  /**
+   * Set this node's network location.
+   * @param location it's network location
+   */
+  void setNetworkLocation(String location);
+
   /** @return this node's self name in network topology. This should be node's
    * IP or hostname.
    * */
   String getNetworkName();
 
+  /**
+   * Set this node's name, can be hostname or Ipaddress.
+   * @param name it's network name
+   */
+  void setNetworkName(String name);
+
   /** @return this node's full path in network topology. It's the concatenation
    *  of location and name.
    * */

hadoop-hdds/common/src/main/java/org/apache/hadoop/hdds/scm/net/NodeImpl.java

@@ -27,11 +27,11 @@
  */
 public class NodeImpl implements Node {
   // host:port#
-  private final String name;
+  private String name;
   // string representation of this node's location, such as /dc1/rack1
-  private final String location;
+  private String location;
   // location + "/" + name
-  private final String path;
+  private String path;
   // which level of the tree the node resides, start from 1 for root
   private int level;
   // node's parent
@@ -53,10 +53,7 @@ public NodeImpl(String name, String location, int cost) {
     }
     this.name = (name == null) ? ROOT : name;
     this.location = NetUtils.normalize(location);
-    this.path = this.location.equals(PATH_SEPARATOR_STR) ?
-        this.location + this.name :
-        this.location + PATH_SEPARATOR_STR + this.name;
-
+    this.path = getPath();
     this.cost = cost;
   }
 
@@ -84,13 +81,32 @@ public String getNetworkName() {
     return name;
   }
 
+  /**
+   * Set this node's name, can be hostname or Ipaddress.
+   * @param networkName it's network name
+   */
+  public void setNetworkName(String networkName) {
+    this.name = networkName;
+    this.path = getPath();
+  }
+
   /**
    * @return this node's network location
    */
   public String getNetworkLocation() {
     return location;
   }
 
+  /**
+   * Set this node's network location.
+   * @param networkLocation it's network location
+   */
+  @Override
+  public void setNetworkLocation(String networkLocation) {
+    this.location = networkLocation;
+    this.path = getPath();
+  }
+
   /**
    * @return this node's full path in network topology. It's the concatenation
    * of location and name.
@@ -197,4 +213,10 @@ public int hashCode() {
   public String toString() {
     return getNetworkFullPath();
   }
+
+  private String getPath() {
+    return this.location.equals(PATH_SEPARATOR_STR) ?
+        this.location + this.name :
+        this.location + PATH_SEPARATOR_STR + this.name;
+  }
 }

hadoop-hdds/server-scm/pom.xml

@@ -145,6 +145,9 @@ https://maven.apache.org/xsd/maven-4.0.0.xsd">
       <testResource>
         <directory>${basedir}/../../hadoop-hdds/common/src/main/resources</directory>
       </testResource>
+      <testResource>
+        <directory>${basedir}/src/test/resources</directory>
+      </testResource>
     </testResources>
   </build>
 </project>

hadoop-hdds/server-scm/src/main/java/org/apache/hadoop/hdds/scm/node/NodeManager.java

@@ -171,4 +171,13 @@ void processNodeReport(DatanodeDetails datanodeDetails,
    */
   // TODO: We can give better name to this method!
   List<SCMCommand> getCommandQueue(UUID dnID);
+
+  /**
+   * Given datanode host address, returns the DatanodeDetails for the
+   * node.
+   *
+   * @param address node host address
+   * @return the given datanode, or null if not found
+   */
+  DatanodeDetails getNode(String address);
 }

hadoop-hdds/server-scm/src/main/java/org/apache/hadoop/hdds/scm/node/SCMNodeManager.java

@@ -23,6 +23,9 @@
 import org.apache.hadoop.hdds.protocol.proto
         .StorageContainerDatanodeProtocolProtos.PipelineReportsProto;
 import org.apache.hadoop.hdds.scm.container.ContainerID;
+import org.apache.hadoop.hdds.scm.net.NetConstants;
+import org.apache.hadoop.hdds.scm.net.NetworkTopology;
+import org.apache.hadoop.hdds.scm.net.Node;
 import org.apache.hadoop.hdds.scm.pipeline.Pipeline;
 import org.apache.hadoop.hdds.scm.pipeline.PipelineID;
 import org.apache.hadoop.hdds.scm.node.states.NodeAlreadyExistsException;
@@ -44,14 +47,19 @@
     .StorageContainerDatanodeProtocolProtos.StorageReportProto;
 import org.apache.hadoop.hdds.protocol.proto
     .StorageContainerDatanodeProtocolProtos.SCMVersionRequestProto;
+import org.apache.hadoop.hdfs.DFSConfigKeys;
 import org.apache.hadoop.ipc.Server;
 import org.apache.hadoop.metrics2.util.MBeans;
+import org.apache.hadoop.net.CachedDNSToSwitchMapping;
+import org.apache.hadoop.net.DNSToSwitchMapping;
+import org.apache.hadoop.net.TableMapping;
 import org.apache.hadoop.ozone.OzoneConsts;
 import org.apache.hadoop.ozone.protocol.VersionResponse;
 import org.apache.hadoop.ozone.protocol.commands.CommandForDatanode;
 import org.apache.hadoop.ozone.protocol.commands.RegisteredCommand;
 import org.apache.hadoop.ozone.protocol.commands.SCMCommand;
 
+import org.apache.hadoop.util.ReflectionUtils;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
@@ -93,6 +101,9 @@ public class SCMNodeManager implements NodeManager {
   // Node manager MXBean
   private ObjectName nmInfoBean;
   private final StorageContainerManager scmManager;
+  private final NetworkTopology clusterMap;
+  private final DNSToSwitchMapping dnsToSwitchMapping;
+  private final boolean useHostname;
 
   /**
    * Constructs SCM machine Manager.
@@ -108,6 +119,18 @@ public SCMNodeManager(OzoneConfiguration conf, String clusterID,
     LOG.info("Entering startup safe mode.");
     registerMXBean();
     this.metrics = SCMNodeMetrics.create(this);
+    this.clusterMap = scmManager.getClusterMap();
+    Class<? extends DNSToSwitchMapping> dnsToSwitchMappingClass =
+        conf.getClass(DFSConfigKeys.NET_TOPOLOGY_NODE_SWITCH_MAPPING_IMPL_KEY,
+            TableMapping.class, DNSToSwitchMapping.class);
+    DNSToSwitchMapping newInstance = ReflectionUtils.newInstance(
+        dnsToSwitchMappingClass, conf);
+    this.dnsToSwitchMapping =
+        ((newInstance instanceof CachedDNSToSwitchMapping) ? newInstance
+            : new CachedDNSToSwitchMapping(newInstance));
+    this.useHostname = conf.getBoolean(
+        DFSConfigKeys.DFS_DATANODE_USE_DN_HOSTNAME,
+        DFSConfigKeys.DFS_DATANODE_USE_DN_HOSTNAME_DEFAULT);
   }
 
   private void registerMXBean() {
@@ -228,14 +251,27 @@ public RegisteredCommand register(
       datanodeDetails.setIpAddress(dnAddress.getHostAddress());
     }
     try {
+      String location;
+      if (useHostname) {
+        datanodeDetails.setNetworkName(datanodeDetails.getHostName());
+        location = nodeResolve(datanodeDetails.getHostName());
+      } else {
+        datanodeDetails.setNetworkName(datanodeDetails.getIpAddress());
+        location = nodeResolve(datanodeDetails.getIpAddress());
+      }
+      if (location != null) {
+        datanodeDetails.setNetworkLocation(location);
+      }
       nodeStateManager.addNode(datanodeDetails);
+      clusterMap.add(datanodeDetails);
       // Updating Node Report, as registration is successful
       processNodeReport(datanodeDetails, nodeReport);
       LOG.info("Registered Data node : {}", datanodeDetails);
     } catch (NodeAlreadyExistsException e) {
       LOG.trace("Datanode is already registered. Datanode: {}",
           datanodeDetails.toString());
     }
+
     return RegisteredCommand.newBuilder().setErrorCode(ErrorCode.success)
         .setDatanodeUUID(datanodeDetails.getUuidString())
         .setClusterID(this.clusterID)
@@ -515,5 +551,36 @@ public List<SCMCommand> getCommandQueue(UUID dnID) {
     return commandQueue.getCommand(dnID);
   }
 
+  /**
+   * Given datanode address or host name, returns the DatanodeDetails for the
+   * node.
+   *
+   * @param address node host address
+   * @return the given datanode, or null if not found
+   */
+  @Override
+  public DatanodeDetails getNode(String address) {
+    Node node = null;
+    String location = nodeResolve(address);
+    if (location != null) {
+      node = clusterMap.getNode(location + NetConstants.PATH_SEPARATOR_STR +
+          address);
+    }
+    return node == null ? null : (DatanodeDetails)node;
+  }
 
+  private String nodeResolve(String hostname) {
+    List<String> hosts = new ArrayList<>(1);
+    hosts.add(hostname);
+    List<String> resolvedHosts = dnsToSwitchMapping.resolve(hosts);
+    if (resolvedHosts != null && !resolvedHosts.isEmpty()) {
+      String location = resolvedHosts.get(0);
+      LOG.debug("Resolve datanode {} return location {}", hostname, location);
+      return location;
+    } else {
+      LOG.error("Node {} Resolution failed. Please make sure that DNS table " +
+          "mapping or configured mapping is functional.", hostname);
+      return null;
+    }
+  }
 }

hadoop-hdds/server-scm/src/main/java/org/apache/hadoop/hdds/scm/server/StorageContainerManager.java

@@ -372,14 +372,15 @@ public StorageContainerManager(OzoneConfiguration conf,
   private void initializeSystemManagers(OzoneConfiguration conf,
                                        SCMConfigurator configurator)
       throws IOException {
+    clusterMap = new NetworkTopologyImpl(conf);
+
     if(configurator.getScmNodeManager() != null) {
       scmNodeManager = configurator.getScmNodeManager();
     } else {
       scmNodeManager = new SCMNodeManager(
           conf, scmStorageConfig.getClusterID(), this, eventQueue);
     }
 
-    clusterMap = new NetworkTopologyImpl(conf);
     ContainerPlacementPolicy containerPlacementPolicy =
         ContainerPlacementPolicyFactory.getPolicy(conf, scmNodeManager,
             clusterMap, true);
@@ -1067,4 +1068,12 @@ public Map<String, Integer> getContainerStateCount() {
   public SCMMetadataStore getScmMetadataStore() {
     return scmMetadataStore;
   }
+
+  /**
+   * Returns the SCM network topology cluster.
+   * @return NetworkTopology
+   */
+  public NetworkTopology getClusterMap() {
+    return this.clusterMap;
+  }
 }

hadoop-hdds/server-scm/src/test/java/org/apache/hadoop/hdds/scm/TestUtils.java

@@ -151,7 +151,7 @@ public static DatanodeDetails getDatanodeDetails(
    *
    * @return DatanodeDetails
    */
-  private static DatanodeDetails createDatanodeDetails(String uuid,
+  public static DatanodeDetails createDatanodeDetails(String uuid,
       String hostname, String ipAddress, String networkLocation) {
     DatanodeDetails.Port containerPort = DatanodeDetails.newPort(
         DatanodeDetails.Port.Name.STANDALONE, 0);

hadoop-hdds/server-scm/src/test/java/org/apache/hadoop/hdds/scm/container/MockNodeManager.java

@@ -451,6 +451,11 @@ public List<SCMCommand> getCommandQueue(UUID dnID) {
     return null;
   }
 
+  @Override
+  public DatanodeDetails getNode(String address) {
+    return null;
+  }
+
   /**
    * A class to declare some values for the nodes so that our tests
    * won't fail.