Package org.apache.helix.model

Examples of org.apache.helix.model.CurrentState

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      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;
      }

      String state = curState.getState(_partitionKey);
      if (state == null || !state.equalsIgnoreCase("LEADER")) {
        return;
      }
    }
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    LOG.debug(String.format("Requesting a state transition to %s for partition %s.", state,
        partition));
    try {
      PropertyKey.Builder keyBuilder = accessor.keyBuilder();
      PropertyKey key = keyBuilder.currentState(instance, sessionId, resource);
      CurrentState currStateDelta = new CurrentState(resource);
      currStateDelta.setRequestedState(partition, state.name());

      return accessor.updateProperty(key, currStateDelta);
    } catch (Exception e) {
      LOG.error(String.format("Error when requesting a state transition to %s for partition %s.",
          state, partition), e);
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      map.put(CurrentState.CurrentStateProperty.REQUESTED_STATE.name(), null);
      rec.getMapFields().put(partitionName, map);
      ZNRecordDelta delta = new ZNRecordDelta(rec, ZNRecordDelta.MergeOperation.SUBTRACT);
      List<ZNRecordDelta> deltaList = new ArrayList<ZNRecordDelta>();
      deltaList.add(delta);
      CurrentState currStateUpdate = new CurrentState(resource);
      currStateUpdate.setDeltaList(deltaList);

      // Update the ZK current state of the node
      accessor.updateProperty(key, currStateUpdate);
    }
    catch (Exception e)
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    try {
      // set current state to ERROR for the partition
      // if the transition is not canceled, it should go into error state
      if (code == ErrorCode.ERROR) {
        CurrentState currentStateDelta = new CurrentState(resourceName);
        currentStateDelta.setState(partition, HelixDefinedState.ERROR.toString());
        _stateModel.updateState(HelixDefinedState.ERROR.toString());

        // if transit from ERROR state, disable the partition
        if (_message.getFromState().equalsIgnoreCase(HelixDefinedState.ERROR.toString())) {
          disablePartition();
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  public String getResourceStateModelDef(String resourceName) {
    return _resourceStateModelMap.get(resourceName);
  }

  public void setBucketSize(String resource, int bucketSize) {
    CurrentState curStateMeta = _curStateMetaMap.get(resource);
    if (curStateMeta == null) {
      curStateMeta = new CurrentState(resource);
      _curStateMetaMap.put(resource, curStateMeta);
    }
    curStateMeta.setBucketSize(bucketSize);
  }
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    curStateMeta.setBucketSize(bucketSize);
  }

  public int getBucketSize(String resource) {
    int bucketSize = 0;
    CurrentState curStateMeta = _curStateMetaMap.get(resource);
    if (curStateMeta != null) {
      bucketSize = curStateMeta.getBucketSize();
    }

    return bucketSize;
  }
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    NotificationContext context;
    executor.registerMessageHandlerFactory(MessageType.TASK_REPLY.toString(),
                                           new AsyncCallbackService());
    // String clusterName =" testcluster";
    context = new NotificationContext(manager);
    CurrentState currentStateDelta = new CurrentState("TestDB");
    currentStateDelta.setState("TestDB_0", "OFFLINE");
    HelixStateTransitionHandler handler =
        new HelixStateTransitionHandler(stateModel,
                                        message,
                                        context,
                                        currentStateDelta);
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        generator.generateConfigForMasterSlave());
    Builder keyBuilder = accessor.keyBuilder();
    accessor.setProperty(keyBuilder.stateModelDef("MasterSlave"), stateModelDef);

    context = new NotificationContext(manager);
    CurrentState currentStateDelta = new CurrentState("TestDB");
    currentStateDelta.setState("TestDB_0", "OFFLINE");

    HelixStateTransitionHandler stHandler = new HelixStateTransitionHandler(stateModel, message,
        context, currentStateDelta);
    HelixTask handler;
    handler = new HelixTask(message, context, stHandler, executor);
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    accessor.setProperty(keyBuilder.stateModelDef("MasterSlave"), stateModelDef);


    context = new NotificationContext(manager);
   
    CurrentState currentStateDelta = new CurrentState("TestDB");
    currentStateDelta.setState("TestDB_0", "OFFLINE");

    HelixStateTransitionHandler stHandler = new HelixStateTransitionHandler(stateModel, message,
        context, currentStateDelta);

    HelixTask handler = new HelixTask(message, context, stHandler, executor);
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        List<String> sessionIds =
            accessor.getChildNames(keyBuilder.sessions(instanceName));

        for (String sessionId : sessionIds)
        {
          CurrentState curState =
              accessor.getProperty(keyBuilder.currentState(instanceName,
                                                           sessionId,
                                                           resourceName));

          if (curState != null && curState.getRecord().getMapFields().size() != 0)
          {
            return false;
          }
        }
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Related Classes of org.apache.helix.model.CurrentState

  • org.apache.helix.api.accessor.ParticipantAccessor
  • org.apache.helix.api.TestNewStages
  • org.apache.helix.controller.rebalancer.AutoRebalancer
  • org.apache.helix.controller.stages.BestPossibleStateCalcStage
  • org.apache.helix.controller.stages.CurrentStateOutput
  • org.apache.helix.controller.stages.ResourceComputationStage
  • org.apache.helix.controller.stages.ResourceCurrentState
  • org.apache.helix.controller.stages.TestCurrentStateComputationStage
  • org.apache.helix.controller.stages.TestRebalancePipeline
  • org.apache.helix.controller.stages.TestResourceComputationStage
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