Package com.linkedin.helix

Examples of com.linkedin.helix.HelixDataAccessor

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      // manually add ideal state for participant leader using LeaderStandby
      // model

      zkClient = new ZkClient(_zkAddr, ZkClient.DEFAULT_CONNECTION_TIMEOUT);
      zkClient.setZkSerializer(new ZNRecordSerializer());
      HelixDataAccessor accessor = new ZKHelixDataAccessor(_manager.getClusterName(), new ZkBaseDataAccessor(zkClient));
      Builder keyBuilder = accessor.keyBuilder();

      IdealState idealState = new IdealState(_resourceName);
      idealState.setIdealStateMode(IdealStateModeProperty.AUTO.toString());
      idealState.setReplicas(StateModelToken.ANY_LIVEINSTANCE.toString());
      idealState.setNumPartitions(1);
      idealState.setStateModelDefRef(LEADER_STANDBY);
      idealState.setStateModelFactoryName(_resourceName);
      List<String> prefList = new ArrayList<String>(Arrays.asList(StateModelToken.ANY_LIVEINSTANCE
          .toString()));
      idealState.getRecord().setListField(_resourceName + "_0", prefList);

      List<String> idealStates = accessor.getChildNames(keyBuilder.idealStates());
      while (idealStates == null || !idealStates.contains(_resourceName))
      {
        accessor.setProperty(keyBuilder.idealStates(_resourceName), idealState);
        idealStates = accessor.getChildNames(keyBuilder.idealStates());
      }

      LOG.info("Set idealState for participantLeader:" + _resourceName + ", idealState:"
          + idealState);
    } finally
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    {
      if (changeContext.getType().equals(NotificationContext.Type.INIT)
          || changeContext.getType().equals(NotificationContext.Type.CALLBACK))
      {
        // DataAccessor dataAccessor = manager.getDataAccessor();
        HelixDataAccessor accessor = manager.getHelixDataAccessor();
        Builder keyBuilder = accessor.keyBuilder();

        while (accessor.getProperty(keyBuilder.controllerLeader()) == null)
        {
          boolean success = tryUpdateController(manager);
          if (success)
          {
            updateHistory(manager);
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  }

  private boolean tryUpdateController(HelixManager manager)
  {
    // DataAccessor dataAccessor = manager.getDataAccessor();
    HelixDataAccessor accessor = manager.getHelixDataAccessor();
    Builder keyBuilder = accessor.keyBuilder();

    LiveInstance leader = new LiveInstance(manager.getInstanceName());
    try
    {
      leader.setLiveInstance(ManagementFactory.getRuntimeMXBean().getName());
      // TODO: this session id is not the leader's session id in distributed mode
      leader.setSessionId(manager.getSessionId());
      leader.setHelixVersion(manager.getVersion());
      if(ZKPropertyTransferServer.getInstance() != null)
      {
        String zkPropertyTransferServiceUrl = ZKPropertyTransferServer.getInstance().getWebserviceUrl();
        if(zkPropertyTransferServiceUrl != null)
        {
          leader.setWebserviceUrl(zkPropertyTransferServiceUrl);
        }
      }
      else
      {
        LOG.warn("ZKPropertyTransferServer instnace is null");
      }
      boolean success = accessor.createProperty(keyBuilder.controllerLeader(), leader);
      if (success)
      {
        return true;
      }
      else
      {
        LOG.info("Unable to become leader probably because some other controller becames the leader");
      }
    }
    catch (Exception e)
    {
      LOG.error("Exception when trying to updating leader record in cluster:"
                    + manager.getClusterName()
                    + ". Need to check again whether leader node has been created or not",
                e);
    }

    leader = accessor.getProperty(keyBuilder.controllerLeader());
    if (leader != null)
    {
      String leaderName = leader.getInstanceName(); // leader.getLeader();
      LOG.info("Leader exists for cluster:" + manager.getClusterName()
          + ", currentLeader:" + leaderName);
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    return false;
  }

  private void updateHistory(HelixManager manager)
  {
    HelixDataAccessor accessor = manager.getHelixDataAccessor();
    Builder keyBuilder = accessor.keyBuilder();

    LeaderHistory history = accessor.getProperty(keyBuilder.controllerLeaderHistory());
    if (history == null)
    {
      history = new LeaderHistory(PropertyType.HISTORY.toString());
    }
    history.updateHistory(manager.getClusterName(), manager.getInstanceName());
    accessor.setProperty(keyBuilder.controllerLeaderHistory(), history);
  }
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    AsyncCallback asyncCallback = new MockAsyncCallback();
    int messagesSent = _startCMResultMap.get(hostSrc)._manager.getMessagingService()
        .sendAndWait(cr, msg, asyncCallback, 3000);
    Assert.assertTrue(messagesSent == 1);
    Assert.assertTrue(asyncCallback.isTimedOut());
    HelixDataAccessor accessor = _startCMResultMap.get(hostDest)._manager.getHelixDataAccessor();

    Assert.assertTrue(accessor.getChildNames(accessor.keyBuilder().messages(hostDest)).size() == 0);

    msg = new Message(factory.getMessageType(),msgId);
    msg.setMsgId(msgId);
    msg.setSrcName(hostSrc);
    msg.setTgtSessionId("*");
    msg.setMsgState(MessageState.NEW);
    para = "Testing messaging para";
    msg.getRecord().setSimpleField("TestMessagingPara", para);

    cr = new Criteria();
    cr.setInstanceName(hostDest);
    cr.setRecipientInstanceType(InstanceType.PARTICIPANT);
    cr.setSessionSpecific(false);

    nMsgs = _startCMResultMap.get(hostSrc)._manager.getMessagingService().send(cr, msg);
    AssertJUnit.assertTrue(nMsgs == 1);
    for(int i = 0; i< 5; i++)
    {
      Thread.sleep(2500);
      if(TestMessagingHandlerFactory._processedMsgIds
          .contains(para))
      {
        break;
      }
    }
    AssertJUnit.assertTrue(TestMessagingHandlerFactory._processedMsgIds
        .contains(para));
    Assert.assertTrue(accessor.getChildNames(accessor.keyBuilder().messages(hostDest)).size() == 0);
  }
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    {
      throw new StageException("Missing attributes in event:" + event
          + ". Requires ClusterManager|RESOURCES|DataCache");
    }

    HelixDataAccessor dataAccessor = manager.getHelixDataAccessor();

    CurrentStateOutput currentStateOutput =
        event.getAttribute(AttributeName.CURRENT_STATE.toString());

    List<ExternalView> newExtViews = new ArrayList<ExternalView>();
    List<PropertyKey> keys = new ArrayList<PropertyKey>();
   
    for (String resourceName : resourceMap.keySet())
    {
      ExternalView view = new ExternalView(resourceName);
      // if resource ideal state has bucket size, set it
      // otherwise resource has been dropped, use bucket size from current state instead
      Resource resource = resourceMap.get(resourceName);
      if (resource.getBucketSize() > 0)
      {
        view.setBucketSize(resource.getBucketSize());
      } else
      {
        view.setBucketSize(currentStateOutput.getBucketSize(resourceName));
      }
     
      for (Partition partition : resource.getPartitions())
      {
        Map<String, String> currentStateMap =
            currentStateOutput.getCurrentStateMap(resourceName, partition);
        if (currentStateMap != null && currentStateMap.size() > 0)
        {
          // Set<String> disabledInstances
          // = cache.getDisabledInstancesForResource(resource.toString());
          for (String instance : currentStateMap.keySet())
          {
            // if (!disabledInstances.contains(instance))
            // {
            view.setState(partition.getPartitionName(),
                          instance,
                          currentStateMap.get(instance));
            // }
          }
        }
      }
      // Update cluster status monitor mbean
      ClusterStatusMonitor clusterStatusMonitor =
          (ClusterStatusMonitor) event.getAttribute("clusterStatusMonitor");
      if (clusterStatusMonitor != null)
      {
        clusterStatusMonitor.onExternalViewChange(view,
                                                  cache._idealStateMap.get(view.getResourceName()));
      }
     
      // compare the new external view with current one, set only on different
      Map<String, ExternalView> curExtViews =
          dataAccessor.getChildValuesMap(manager.getHelixDataAccessor()
                                             .keyBuilder()
                                             .externalViews());

      ExternalView curExtView = curExtViews.get(resourceName);
      if (curExtView == null || !curExtView.getRecord().equals(view.getRecord()))
      {
        keys.add(manager.getHelixDataAccessor().keyBuilder().externalView(resourceName));
        newExtViews.add(view);
        // dataAccessor.setProperty(PropertyType.EXTERNALVIEW, view,
        // resourceName);
      }
    }

    if (newExtViews.size() > 0)
    {
      dataAccessor.setChildren(keys, newExtViews);
    }
   
    long endTime = System.currentTimeMillis();
    log.info("END ExternalViewComputeStage.process(). took: " + (endTime - startTime) + " ms");
  }
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      // therefore, double check to make sure only one participant invokes the code
      if (context.getType() == Type.CALLBACK)
      {
        HelixManager manager = context.getManager();
        // DataAccessor accessor = manager.getDataAccessor();
        HelixDataAccessor accessor = manager.getHelixDataAccessor();
        Builder keyBuilder = accessor.keyBuilder();

        String instance = manager.getInstanceName();
        String sessionId = manager.getSessionId();

        // get resource name from partition key: "PARTICIPANT_LEADER_XXX_0"
        String resourceName = _partitionKey.substring(0, _partitionKey.lastIndexOf('_'));

        CurrentState curState =
            accessor.getProperty(keyBuilder.currentState(instance,
                                                         sessionId,
                                                         resourceName));
        if (curState == null)
        {
          return;
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  {
    @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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  {
    @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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  {
    @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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Related Classes of com.linkedin.helix.HelixDataAccessor

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  • com.linkedin.helix.alerts.TestAddPersistentStats
  • com.linkedin.helix.alerts.TestArrivingParticipantStats
  • com.linkedin.helix.controller.GenericHelixController
  • com.linkedin.helix.controller.stages.ExternalViewComputeStage
  • com.linkedin.helix.controller.stages.ReadClusterDataStage
  • com.linkedin.helix.controller.stages.ReadHealthDataStage
  • com.linkedin.helix.controller.stages.StatsAggregationStage
  • com.linkedin.helix.controller.stages.TaskAssignmentStage
  • com.linkedin.helix.controller.stages.TestMessageThrottleStage
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