| package org.apache.helix.participant; |
| |
| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| */ |
| |
| import java.util.Set; |
| |
| import com.google.common.collect.Sets; |
| import org.apache.helix.HelixManager; |
| import org.apache.helix.HelixManagerFactory; |
| import org.apache.helix.InstanceType; |
| import org.apache.helix.NotificationContext; |
| import org.apache.helix.controller.pipeline.Pipeline; |
| import org.apache.helix.model.Message; |
| import org.apache.helix.participant.statemachine.StateModelInfo; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| @StateModelInfo(initialState = "OFFLINE", states = { |
| "LEADER", "STANDBY" |
| }) |
| public class DistClusterControllerStateModel extends AbstractHelixLeaderStandbyStateModel { |
| private static Logger logger = LoggerFactory.getLogger(DistClusterControllerStateModel.class); |
| protected HelixManager _controller = null; |
| private final Set<Pipeline.Type> _enabledPipelineTypes; |
| |
| public DistClusterControllerStateModel(String zkAddr) { |
| this(zkAddr, Sets.newHashSet(Pipeline.Type.DEFAULT, Pipeline.Type.TASK)); |
| } |
| |
| public DistClusterControllerStateModel(String zkAddr, |
| Set<Pipeline.Type> enabledPipelineTypes) { |
| super(zkAddr); |
| _enabledPipelineTypes = enabledPipelineTypes; |
| } |
| |
| @Override |
| public void onBecomeStandbyFromOffline(Message message, NotificationContext context) { |
| logStateTransition("OFFLINE", "STANDBY", message.getPartitionName(), message.getTgtName()); |
| } |
| |
| @Override |
| public void onBecomeLeaderFromStandby(Message message, NotificationContext context) |
| throws Exception { |
| String clusterName = message.getPartitionName(); |
| String controllerName = message.getTgtName(); |
| |
| logger.info(controllerName + " becoming leader from standby for " + clusterName); |
| |
| if (_controller == null) { |
| _controller = |
| HelixManagerFactory.getZKHelixManager(clusterName, controllerName, |
| InstanceType.CONTROLLER, _zkAddr); |
| _controller.setEnabledControlPipelineTypes(_enabledPipelineTypes); |
| _controller.connect(); |
| _controller.startTimerTasks(); |
| logStateTransition("STANDBY", "LEADER", clusterName, controllerName); |
| } else { |
| logger.error("controller already exists:" + _controller.getInstanceName() + " for " |
| + clusterName); |
| } |
| |
| } |
| |
| @Override |
| public void onBecomeStandbyFromLeader(Message message, NotificationContext context) { |
| String clusterName = message.getPartitionName(); |
| String controllerName = message.getTgtName(); |
| |
| logger.info(controllerName + " becoming standby from leader for " + clusterName); |
| |
| if (_controller != null) { |
| reset(); |
| logStateTransition("LEADER", "STANDBY", clusterName, controllerName); |
| } else { |
| logger.error("No controller exists for " + clusterName); |
| } |
| } |
| |
| @Override |
| public void onBecomeOfflineFromStandby(Message message, NotificationContext context) { |
| logStateTransition("STANDBY", "OFFLINE", message.getPartitionName(), message.getTgtName()); |
| } |
| |
| @Override |
| public void onBecomeDroppedFromOffline(Message message, NotificationContext context) { |
| reset(); |
| logStateTransition("OFFLINE", "DROPPED", message == null ? "" : message.getPartitionName(), |
| message == null ? "" : message.getTgtName()); |
| } |
| |
| @Override |
| public String getStateModeInstanceDescription(String partitionName, String instanceName) { |
| return String.format("Controller for cluster %s on instance %s", partitionName, instanceName); |
| } |
| |
| @Override |
| public void reset() { |
| if (_controller != null) { |
| _controller.disconnect(); |
| _controller = null; |
| } |
| |
| } |
| } |