Examples of com.linkedin.helix.HelixManager

com.linkedin.helix.HelixManager

First class Object any process will interact with
General flow

 manager = HelixManagerFactory.getManagerFor(); ROLE can be participant, spectator or a controller
 manager.connect(); manager.addSOMEListener(); manager.start() After start is invoked the subsequent interactions will be via listener onChange callbacks There will be 3 scenarios for onChange callback, which can be determined using NotificationContext.type INIT -> will be invoked the first time the listener is added CALLBACK -> will be invoked due to datachange in the property value FINALIZE -> will be invoked when listener is removed or session expires manager.disconnect()

Default implementations available @see HelixStateMachineEngine for participant @see RoutingTableProvider for spectator @see GenericHelixController for controller @author kgopalak

  public class StalenessAlertTransition extends MockTransition
  {
    @Override
    public void doTransition(Message message, NotificationContext context)
    {
      HelixManager manager = context.getManager();
      HelixDataAccessor accessor = manager.getHelixDataAccessor();
      String fromState = message.getFromState();
      String toState = message.getToState();
      String instance = message.getTgtName();
      String partition = message.getPartitionName();

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    storage.setPermissions(partition, "READWRITE");


    String[] pdata = partition.split("\\.");
    String dbName = pdata[0];
    
    HelixManager manager = context.getManager();
    
    //start the reporting thread
    logger.debug("Starting stats reporting thread");
    StatReporterThread reporterThread = new StatReporterThread(manager, _provider, dbName, partition, 
                        _reportInterval, _reportValues, _countdown);

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  public class AddDropAlertTransition extends MockTransition
  {
    @Override
    public void doTransition(Message message, NotificationContext context)
    {
      HelixManager manager = context.getManager();
      HelixDataAccessor accessor = manager.getHelixDataAccessor();
      String fromState = message.getFromState();
      String toState = message.getToState();
      String instance = message.getTgtName();
      String partition = message.getPartitionName();

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


    HelixDataAccessor accessor =
        new ZKHelixDataAccessor(clusterName, new ZkBaseDataAccessor(_gZkClient));
    HelixManager manager = new DummyClusterManager(clusterName, accessor);


    // ideal state: node0 is MASTER, node1 is SLAVE
    // replica=2 means 1 master and 1 slave
    setupIdealState(clusterName, new int[] { 0, 1 }, new String[] { "TestDB" }, 1, 2);
    setupLiveInstances(clusterName, new int[] { 0, 1 });

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


    HelixDataAccessor accessor =
        new ZKHelixDataAccessor(clusterName, new ZkBaseDataAccessor(_gZkClient));
    HelixManager manager = new DummyClusterManager(clusterName, accessor);


    // ideal state: node0 is MASTER, node1 is SLAVE
    // replica=2 means 1 master and 1 slave
    setupIdealState(clusterName, new int[] { 0, 1 }, new String[] { "TestDB" }, 1, 2);
    setupLiveInstances(clusterName, new int[] { 0, 1 });

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        _taskMap.clear();
      }
      return;
    }


    HelixManager manager = changeContext.getManager();
    HelixDataAccessor accessor = manager.getHelixDataAccessor();
    Builder keyBuilder = accessor.keyBuilder();


    if (messages == null || messages.size() == 0)
    {
      LOG.info("No Messages to process");
      return;
    }


    // sort message by creation timestamp, so message created earlier is processed first
    Collections.sort(messages, Message.CREATE_TIME_COMPARATOR);


    // message handlers created
    List<MessageHandler> handlers = new ArrayList<MessageHandler>();


    // message read
    List<Message> readMsgs = new ArrayList<Message>();


    String sessionId = manager.getSessionId();
    List<String> curResourceNames =
        accessor.getChildNames(keyBuilder.currentStates(instanceName, sessionId));
    List<PropertyKey> createCurStateKeys = new ArrayList<PropertyKey>();
    List<CurrentState> metaCurStates = new ArrayList<CurrentState>();
    Set<String> createCurStateNames = new HashSet<String>();

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  }


  @Test()
  public void TestMessageSend()
  {
    HelixManager manager = new MockHelixManager();
    DefaultMessagingService svc = new DefaultMessagingService(manager);
    TestMessageHandlerFactory factory = new TestMessageHandlerFactory();
    svc.registerMessageHandlerFactory(factory.getMessageType(), factory);


    Criteria recipientCriteria = new Criteria();

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  @Test(groups =
  { "unitTest" })
  public void testAsyncCallbackSvc() throws Exception
  {
    AsyncCallbackService svc = new AsyncCallbackService();
    HelixManager manager = new MockHelixManager();
    NotificationContext changeContext = new NotificationContext(manager);
    
    Message msg = new Message(svc.getMessageType(), UUID.randomUUID().toString());
    msg.setTgtSessionId(manager.getSessionId());
    try
    {
      MessageHandler aHandler = svc.createHandler(msg, changeContext);
    }
    catch(HelixException e)
    {
      AssertJUnit.assertTrue(e.getMessage().indexOf(msg.getMsgId())!= -1);
    }
    Message msg2 = new Message("RandomType", UUID.randomUUID().toString());
    msg2.setTgtSessionId(manager.getSessionId());
    try
    {
      MessageHandler aHandler = svc.createHandler(msg2, changeContext);
    }
    catch(HelixException e)
    {
      AssertJUnit.assertTrue(e.getMessage().indexOf(msg2.getMsgId())!= -1);
    }
    Message msg3 = new Message(svc.getMessageType(), UUID.randomUUID().toString());
    msg3.setTgtSessionId(manager.getSessionId());
    msg3.setCorrelationId("wfwegw");
    try
    {
      MessageHandler aHandler = svc.createHandler(msg3, changeContext);
    }

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  @Test
  public void TestParse()
  {
    StatsAggregationStage stage = new StatsAggregationStage();
    String controllerName = CONTROLLER_PREFIX + "_0";
    HelixManager manager = _startCMResultMap.get(controllerName)._manager;
    
    String instanceName  = stage.parseInstanceName("localhost_12918.TestStat@DB=123.latency", manager);
    Assert.assertTrue(instanceName.equals("localhost_12918"));
    
    instanceName  = stage.parseInstanceName("localhost_12955.TestStat@DB=123.latency", manager);

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  public void start()
  {


    try
    {
      HelixManager manager = HelixManagerFactory.getZKHelixManager(clusterName,
                                                                         null,
                                                                         InstanceType.SPECTATOR,
                                                                         zkConnectString);




      manager.connect();
      manager.addExternalViewChangeListener(_routingTableProvider);
    } catch (Exception e)
    {
      e.printStackTrace();
    }
  }

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Related Classes of com.linkedin.helix.HelixManager

com.linkedin.helix.controller.GenericHelixController

com.linkedin.helix.controller.HelixControllerMain

com.linkedin.helix.controller.stages.BestPossibleStateCalcStage

com.linkedin.helix.controller.stages.CompatibilityCheckStage

com.linkedin.helix.controller.stages.ExternalViewComputeStage

com.linkedin.helix.controller.stages.MessageGenerationPhase

com.linkedin.helix.controller.stages.ReadClusterDataStage

com.linkedin.helix.controller.stages.ReadHealthDataStage

com.linkedin.helix.controller.stages.StatsAggregationStage

com.linkedin.helix.controller.stages.TaskAssignmentStage

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