| /** |
| * 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. |
| */ |
| package org.apache.hadoop.hdfs.server.blockmanagement; |
| |
| import java.util.Set; |
| |
| import org.apache.hadoop.classification.InterfaceAudience; |
| import org.apache.hadoop.classification.InterfaceStability; |
| |
| /** |
| * An implementation of @see BlockPlacementStatus for |
| * @see BlockPlacementPolicyWithNodeGroup |
| */ |
| @InterfaceAudience.Private |
| @InterfaceStability.Evolving |
| public class BlockPlacementStatusWithNodeGroup implements BlockPlacementStatus { |
| |
| private final BlockPlacementStatus parentBlockPlacementStatus; |
| private final Set<String> currentNodeGroups; |
| private final int requiredNodeGroups; |
| |
| /** |
| * @param parentBlockPlacementStatus the parent class' status |
| * @param currentNodeGroups the current set of node groups of the replicas |
| * @param requiredNodeGroups the number of required node groups |
| */ |
| public BlockPlacementStatusWithNodeGroup( |
| BlockPlacementStatus parentBlockPlacementStatus, |
| Set<String> currentNodeGroups, int requiredNodeGroups) { |
| this.parentBlockPlacementStatus = parentBlockPlacementStatus; |
| this.currentNodeGroups = currentNodeGroups; |
| this.requiredNodeGroups = requiredNodeGroups; |
| } |
| |
| @Override |
| public boolean isPlacementPolicySatisfied() { |
| return parentBlockPlacementStatus.isPlacementPolicySatisfied() |
| && isNodeGroupPolicySatisfied(); |
| } |
| |
| private boolean isNodeGroupPolicySatisfied() { |
| return requiredNodeGroups <= currentNodeGroups.size(); |
| } |
| |
| @Override |
| public String getErrorDescription() { |
| if (isPlacementPolicySatisfied()) { |
| return null; |
| } |
| |
| StringBuilder errorDescription = new StringBuilder(); |
| if (!parentBlockPlacementStatus.isPlacementPolicySatisfied()) { |
| errorDescription.append(parentBlockPlacementStatus.getErrorDescription()); |
| } |
| |
| if (!isNodeGroupPolicySatisfied()) { |
| if (errorDescription.length() != 0) { |
| errorDescription.append(" "); |
| } |
| errorDescription.append("The block has " + requiredNodeGroups |
| + " replicas. But it only has " + currentNodeGroups.size() |
| + " node groups " + currentNodeGroups + "."); |
| } |
| return errorDescription.toString(); |
| } |
| } |