Package org.apache.helix

Examples of org.apache.helix.HelixConnection

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    opts.addOption("zkAddress", true, "Zookeeper address");
    opts.addOption("participantClass", true, "Participant service class");
    try {
      CommandLine cliParser = new GnuParser().parse(opts, args);
      String zkAddress = cliParser.getOptionValue("zkAddress");
      final HelixConnection connection = new ZkHelixConnection(zkAddress);
      connection.connect();
      ClusterId clusterId = ClusterId.from(cliParser.getOptionValue("cluster"));
      ParticipantId participantId = ParticipantId.from(cliParser.getOptionValue("participantId"));
      String participantClass = cliParser.getOptionValue("participantClass");
      @SuppressWarnings("unchecked")
      Class<? extends AbstractParticipantService> clazz =
          (Class<? extends AbstractParticipantService>) Class.forName(participantClass);
      final AbstractParticipantService containerParticipant =
          clazz.getConstructor(HelixConnection.class, ClusterId.class, ParticipantId.class)
              .newInstance(connection, clusterId, participantId);
      containerParticipant.startAsync();
      containerParticipant.awaitRunning(60, TimeUnit.SECONDS);
      containerParticipant
          .getParticipant()
          .getMessagingService()
          .registerMessageHandlerFactory(MessageType.SHUTDOWN.toString(),
              new ShutdownMessageHandlerFactory(containerParticipant, connection));
      Runtime.getRuntime().addShutdownHook(new Thread(new Runnable() {
        @Override
        public void run() {
          LOG.info("Received a shutdown signal. Stopping participant");
          containerParticipant.stopAsync();
          containerParticipant.awaitTerminated();
          connection.disconnect();
        }
      }) {

      });
      Thread.currentThread().join();
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        NUM_PARTICIPANTS, // number of nodes
        NUM_REPLICAS, // replicas
        "OnlineOffline", RebalanceMode.CUSTOMIZED, true); // do rebalance

    // Connect
    HelixConnection connection = new ZkHelixConnection(_zkaddr);
    connection.connect();

    // Start some participants
    HelixParticipant[] participants = new HelixParticipant[NUM_PARTICIPANTS];
    for (int i = 0; i < NUM_PARTICIPANTS; i++) {
      participants[i] =
          connection.createParticipant(ClusterId.from(clusterName),
              ParticipantId.from("localhost_" + (12918 + i)));
      participants[i].getStateMachineEngine().registerStateModelFactory(
          StateModelDefId.from("OnlineOffline"), new TestHelixConnection.MockStateModelFactory());
      participants[i].start();
    }

    // Start the controller
    HelixController controller =
        connection.createController(ClusterId.from(clusterName), ControllerId.from("controller"));
    controller.start();
    Thread.sleep(500);

    // Verify balanced cluster
    boolean result =
        ClusterStateVerifier.verifyByZkCallback(new BestPossAndExtViewZkVerifier(_zkaddr,
            clusterName));
    Assert.assertTrue(result);

    // Drop a partition from the first participant
    HelixAdmin admin = connection.createClusterManagementTool();
    IdealState idealState = admin.getResourceIdealState(clusterName, RESOURCE_NAME);
    Map<ParticipantId, State> participantStateMap =
        idealState.getParticipantStateMap(PartitionId.from(RESOURCE_NAME + "_0"));
    participantStateMap.remove(ParticipantId.from("localhost_12918"));
    idealState.setParticipantStateMap(PartitionId.from(RESOURCE_NAME + "_0"), participantStateMap);
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        NUM_PARTICIPANTS, // number of nodes
        NUM_REPLICAS, // replicas
        "OnlineOffline", RebalanceMode.CUSTOMIZED, true); // do rebalance

    // Connect
    HelixConnection connection = new ZkHelixConnection(_zkaddr);
    connection.connect();

    // Create a couple controllers
    HelixController[] controllers = new HelixController[NUM_CONTROLLERS];
    for (int i = 0; i < NUM_CONTROLLERS; i++) {
      controllers[i] =
          connection.createController(ClusterId.from(clusterName),
              ControllerId.from("controller_" + i));
      controllers[i].start();
    }
    Thread.sleep(1000);

    // Now verify that exactly one is leader
    int leaderCount = 0;
    for (HelixController controller : controllers) {
      HelixManager adaptor = new ZKHelixManager(controller);
      boolean result = ZkHelixLeaderElection.tryUpdateController(adaptor);
      if (result) {
        leaderCount++;
      }
    }
    Assert.assertEquals(leaderCount, 1);

    // Clean up
    for (HelixController controller : controllers) {
      controller.stop();
    }
    HelixAdmin admin = connection.createClusterManagementTool();
    admin.dropCluster(clusterName);
    System.out.println("END " + clusterName + " at " + new Date(System.currentTimeMillis()));
  }
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        Transition.from(State.from("RELEASED"), State.from("LOCKED")), 1);

    ClusterConfig cluster = clusterBuilder.build();

    // set up a connection to work with ZooKeeper-persisted data
    HelixConnection connection = new ZkHelixConnection(args[0]);
    connection.connect();

    // create the cluster
    createCluster(cluster, connection);

    // update the resource
    updateResource(resource, clusterId, connection);

    // update the participant
    updateParticipant(participant, clusterId, connection);

    // start the controller
    ControllerId controllerId = ControllerId.from("exampleController");
    HelixController helixController = connection.createController(clusterId, controllerId);
    helixController.start();

    // start the specified participant
    HelixParticipant helixParticipant = connection.createParticipant(clusterId, participant.getId());
    helixParticipant.getStateMachineEngine().registerStateModelFactory(lockUnlock.getStateModelDefId(),
        new LockUnlockFactory());
    helixParticipant.start();

    // start another participant via auto join
    HelixParticipant autoJoinParticipant =
        connection.createParticipant(clusterId, ParticipantId.from("localhost_12120"));
    autoJoinParticipant.getStateMachineEngine().registerStateModelFactory(lockUnlock.getStateModelDefId(),
        new LockUnlockFactory());
    autoJoinParticipant.start();

    Thread.sleep(5000);
    printExternalView(connection, clusterId, resource.getId());

    // stop the participants
    helixParticipant.stop();
    autoJoinParticipant.stop();

    // stop the controller
    helixController.stop();

    // drop the cluster
    dropCluster(clusterId, connection);
    connection.disconnect();
  }
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    }));

    final ApplicationSpec appSpec = launcher.getApplicationSpec();

    // Repeatedly print status
    final HelixConnection connection = launcher.pollForConnection();
    final ClusterId clusterId = ClusterId.from(appSpec.getAppName());
    // TODO: this is a hack -- TaskDriver should accept a connection instead of a manager
    HelixManager manager = new ZKHelixManager(new HelixRole() {
      @Override
      public HelixConnection getConnection() {
        return connection;
      }

      @Override
      public ClusterId getClusterId() {
        return clusterId;
      }

      @Override
      public Id getId() {
        return null;
      }

      @Override
      public InstanceType getType() {
        return InstanceType.ADMINISTRATOR;
      }

      @Override
      public ClusterMessagingService getMessagingService() {
        return null;
      }

      @Override
      public HelixDataAccessor getAccessor() {
        return null;
      }
    });

    // Get all submitted jobs
    String workflow = null;
    List<TaskConfig> taskConfigs = appSpec.getTaskConfigs();
    if (taskConfigs != null) {
      for (TaskConfig taskConfig : taskConfigs) {
        String yamlFile = taskConfig.getValue("yamlFile");
        if (yamlFile != null) {
          Workflow flow = Workflow.parse(new File(yamlFile));
          workflow = flow.getName();
        }
      }
    }

    // Repeatedly poll for status
    if (workflow != null) {
      ClusterAccessor accessor = connection.createClusterAccessor(clusterId);
      TaskDriver driver = new TaskDriver(manager);
      while (true) {
        System.out.println("CONTAINER STATUS");
        System.out.println("----------------");
        Cluster cluster = accessor.readCluster();
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        n, // number of nodes
        2, // replicas
        "MasterSlave", true); // do rebalance

    // create connection
    HelixConnection connection = new ZkHelixConnection(_zkaddr);
    connection.connect();

    // start controller
    ClusterId clusterId = ClusterId.from(clusterName);
    ControllerId controllerId = ControllerId.from("controller");
    HelixController controller = connection.createController(clusterId, controllerId);
    controller.start();

    // check leader znode exists
    HelixDataAccessor accessor = connection.createDataAccessor(clusterId);
    PropertyKey.Builder keyBuilder = accessor.keyBuilder();
    LiveInstance leader = accessor.getProperty(keyBuilder.controllerLeader());
    Assert.assertNotNull(leader);
    Assert.assertEquals(leader.getInstanceName(), controllerId.stringify());

    // stop participant
    controller.stop();

    // check leader znode is gone
    Assert.assertNull(accessor.getProperty(keyBuilder.controllerLeader()));

    // clean up
    connection.disconnect();

    System.out.println("END " + clusterName + " at " + new Date(System.currentTimeMillis()));
  }
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        n, // number of nodes
        2, // replicas
        "MasterSlave", true); // do rebalance

    // create connection
    HelixConnection connection = new ZkHelixConnection(_zkaddr);
    connection.connect();

    // start controller
    ClusterId clusterId = ClusterId.from(clusterName);
    final ControllerId controllerId = ControllerId.from("controller");

    // start controller
    HelixController controller = connection.createController(clusterId, controllerId);
    controller.start();

    // check live-instance znode for localhost_12918 exists
    final HelixDataAccessor accessor =
        new ZKHelixDataAccessor(clusterName, _baseAccessor);
    final PropertyKey.Builder keyBuilder = accessor.keyBuilder();
    LiveInstance leader = accessor.getProperty(keyBuilder.controllerLeader());
    Assert.assertNotNull(leader);
    Assert.assertEquals(leader.getInstanceName(), controllerId.stringify());

    // remove leader znode externally
    accessor.removeProperty(keyBuilder.controllerLeader());

    // verify leader is re-elected
    boolean result = TestHelper.verify(new TestHelper.Verifier() {

      @Override
      public boolean verify() throws Exception {
        LiveInstance leader = accessor.getProperty(keyBuilder.controllerLeader());
        if (leader == null) {
          return false;
        }

        return leader.getInstanceName().equals(controllerId.stringify());
      }
    }, 3 * 1000);

    Assert.assertTrue(result, "Fail to re-elect a new leader");

    // clean up
    connection.disconnect();

    // check leader znode is gone
    Assert.assertNull(accessor.getProperty(keyBuilder.controllerLeader()));

    System.out.println("END " + clusterName + " at " + new Date(System.currentTimeMillis()));
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        n, // number of nodes
        2, // replicas
        "MasterSlave", true); // do rebalance

    // create connection
    HelixConnection connection = new ZkHelixConnection(_zkaddr);
    connection.connect();

    // start participant
    ClusterId clusterId = ClusterId.from(clusterName);
    HelixParticipant[] participants = new HelixParticipant[n];
    for (int i = 0; i < n; i++) {
      int port = 12918 + i;
      ParticipantId participantId = ParticipantId.from("localhost_" + port);

      participants[i] = connection.createParticipant(clusterId, participantId);
      participants[i].getStateMachineEngine().registerStateModelFactory(
          StateModelDefId.from("MasterSlave"), new TestHelixConnection.MockStateModelFactory());

      participants[i].start();
    }

    // check live-instance znode for localhost_12918/12919 exist
    HelixDataAccessor accessor =
        new ZKHelixDataAccessor(clusterName, _baseAccessor);
    PropertyKey.Builder keyBuilder = accessor.keyBuilder();

    for (int i = 0; i < n; i++) {
      Assert.assertNotNull(accessor.getProperty(keyBuilder.liveInstance(participants[i]
          .getParticipantId().stringify())));
    }

    // stop participant localhost_12918
    participants[0].stop();

    // check live-instance znode for localhost_12918 is gone
    Assert.assertNull(accessor.getProperty(keyBuilder.liveInstance(participants[0]
        .getParticipantId().stringify())));

    // clean up
    connection.disconnect();

    // check live-instance znode for localhost_12919 is gone
    Assert.assertNull(accessor.getProperty(keyBuilder.liveInstance(participants[1]
        .getParticipantId().stringify())));
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        n, // number of nodes
        2, // replicas
        "MasterSlave", true); // do rebalance

    // create connection
    HelixConnection connection = new ZkHelixConnection(_zkaddr);
    connection.connect();

    // start multi-cluster-controller
    ClusterId clusterId = ClusterId.from(clusterName);
    final HelixMultiClusterController[] controllers = new HelixMultiClusterController[n];
    for (int i = 0; i < n; i++) {
      int port = 12918 + i;
      ControllerId controllerId = ControllerId.from("localhost_" + port);
      controllers[i] = connection.createMultiClusterController(clusterId, controllerId);
      controllers[i].start();
    }

    // check live-instance znode for localhost_12918/12919 exists
    final HelixDataAccessor accessor =
        new ZKHelixDataAccessor(clusterName, _baseAccessor);
    final PropertyKey.Builder keyBuilder = accessor.keyBuilder();

    for (int i = 0; i < n; i++) {
      String instanceName = controllers[i].getControllerId().stringify();
      Assert.assertNotNull(accessor.getProperty(keyBuilder.liveInstance(instanceName)));
    }

    // check leader znode exists
    LiveInstance leader = accessor.getProperty(keyBuilder.controllerLeader());
    Assert.assertNotNull(leader);
    Assert.assertEquals(leader.getInstanceName(), controllers[0].getControllerId().stringify());

    // stop controller localhost_12918
    controllers[0].stop();

    // check live-instance znode for localhost_12918 is gone
    String instanceName = controllers[0].getControllerId().stringify();
    Assert.assertNull(accessor.getProperty(keyBuilder.liveInstance(instanceName)));

    // check localhost_12919 becomes the new leader
    boolean success = TestHelper.verify(new TestHelper.Verifier() {

      @Override
      public boolean verify() throws Exception {
        LiveInstance leader = accessor.getProperty(keyBuilder.controllerLeader());
        if (leader == null) {
          return false;
        }
        return leader.getInstanceName().equals(controllers[1].getControllerId().stringify());

      }
    }, 3 * 1000);
    Assert.assertTrue(success, "fail to re-elect new leader");

    // clean up
    connection.disconnect();

    // check live-instance znode for localhost_12919 is gone
    instanceName = controllers[1].getControllerId().stringify();
    Assert.assertNull(accessor.getProperty(keyBuilder.liveInstance(instanceName)));

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    State offline = State.from("OFFLINE");
    State dropped = State.from("DROPPED");
    StateModelDefId stateModelDefId = StateModelDefId.from("MasterSlave");

    // create connection
    HelixConnection connection = new ZkHelixConnection(_zkaddr);
    connection.connect();

    // setup cluster
    ClusterAccessor clusterAccessor = connection.createClusterAccessor(clusterId);
    clusterAccessor.dropCluster();

    StateModelDefinition stateModelDef =
        new StateModelDefinition.Builder(stateModelDefId).addState(master, 1).addState(slave, 2)
            .addState(offline, 3).addState(dropped).addTransition(offline, slave, 3)
            .addTransition(slave, offline, 4).addTransition(slave, master, 2)
            .addTransition(master, slave, 1).addTransition(offline, dropped).initialState(offline)
            .upperBound(master, 1).dynamicUpperBound(slave, "R").build();
    PartitionId partition0 = PartitionId.from(resourceId, "0");
    AutoModeISBuilder idealStateBuilder = new AutoModeISBuilder(resourceId).add(partition0);
    idealStateBuilder.setNumReplica(1).setStateModelDefId(stateModelDefId);
    idealStateBuilder.assignPreferenceList(partition0, participantId);
    IdealState idealState = idealStateBuilder.build();
    clusterAccessor.createCluster(new ClusterConfig.Builder(clusterId).addStateModelDefinition(
        stateModelDef).build());
    clusterAccessor.addResource(new ResourceConfig.Builder(resourceId).idealState(idealState)
        .build());
    clusterAccessor.addParticipant(new ParticipantConfig.Builder(participantId).build());

    // start controller
    HelixController controller = connection.createController(clusterId, controllerId);
    controller.start();

    // start participant
    HelixParticipant participant = connection.createParticipant(clusterId, participantId);
    participant.getStateMachineEngine().registerStateModelFactory(
        StateModelDefId.from("MasterSlave"), new MockStateModelFactory());

    participant.start();
    Thread.sleep(1000);

    // verify
    final HelixDataAccessor accessor = connection.createDataAccessor(clusterId);
    final PropertyKey.Builder keyBuilder = accessor.keyBuilder();
    boolean success = TestHelper.verify(new TestHelper.Verifier() {

      @Override
      public boolean verify() throws Exception {
        ExternalView externalView = accessor.getProperty(keyBuilder.externalView("testDB"));
        Map<ParticipantId, State> stateMap = externalView.getStateMap(PartitionId.from("testDB_0"));

        if (stateMap == null || !stateMap.containsKey(participantId)) {
          return false;
        }

        return stateMap.get(participantId).equals(State.from("MASTER"));
      }
    }, 10 * 1000);

    Assert.assertTrue(success);

    // clean up
    controller.stop();
    participant.stop();
    connection.disconnect();

    System.out.println("END " + clusterName + " at " + new Date(System.currentTimeMillis()));
  }
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