| package org.apache.helix.task; |
| |
| /* |
| * 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.HashMap; |
| import org.apache.helix.controller.stages.BestPossibleStateOutput; |
| import org.apache.helix.controller.dataproviders.WorkflowControllerDataProvider; |
| import org.apache.helix.controller.stages.CurrentStateOutput; |
| import org.apache.helix.model.IdealState; |
| import org.apache.helix.model.Resource; |
| import org.apache.helix.model.ResourceAssignment; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| /** |
| * Custom rebalancer implementation for the {@code Workflow} in task state model. |
| */ |
| public class WorkflowRebalancer extends TaskRebalancer { |
| private static final Logger LOG = LoggerFactory.getLogger(WorkflowRebalancer.class); |
| private WorkflowDispatcher _workflowDispatcher = new WorkflowDispatcher(); |
| |
| @Override |
| public ResourceAssignment computeBestPossiblePartitionState( |
| WorkflowControllerDataProvider clusterData, |
| IdealState taskIs, Resource resource, CurrentStateOutput currStateOutput) { |
| final String workflow = resource.getResourceName(); |
| long startTime = System.currentTimeMillis(); |
| LOG.debug("Computer Best Partition for workflow: " + workflow); |
| _workflowDispatcher.init(_manager); |
| WorkflowContext workflowCtx = _workflowDispatcher |
| .getOrInitializeWorkflowContext(workflow, clusterData.getTaskDataCache()); |
| WorkflowConfig workflowCfg = clusterData.getWorkflowConfig(workflow); |
| |
| _workflowDispatcher.setClusterStatusMonitor(_clusterStatusMonitor); |
| _workflowDispatcher.updateCache(clusterData); |
| _workflowDispatcher.updateWorkflowStatus(workflow, workflowCfg, workflowCtx, currStateOutput, |
| new BestPossibleStateOutput()); |
| _workflowDispatcher.assignWorkflow(workflow, workflowCfg, workflowCtx, currStateOutput, |
| new BestPossibleStateOutput()); |
| |
| LOG.debug(String.format("WorkflowRebalancer computation takes %d ms for workflow %s", |
| System.currentTimeMillis() - startTime, workflow)); |
| return buildEmptyAssignment(workflow, currStateOutput); |
| } |
| |
| |
| |
| @Override |
| public IdealState computeNewIdealState(String resourceName, IdealState currentIdealState, |
| CurrentStateOutput currentStateOutput, WorkflowControllerDataProvider clusterData) { |
| // Nothing to do here with workflow resource. |
| return currentIdealState; |
| } |
| } |