| /** |
| * 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.protocol; |
| |
| import java.util.Collection; |
| |
| import org.apache.hadoop.fs.StorageType; |
| import org.apache.hadoop.hdfs.protocol.Block; |
| import org.apache.hadoop.hdfs.protocol.DatanodeInfo; |
| |
| /** |
| * A BlockStorageMovementCommand is an instruction to a DataNode to move the |
| * given set of blocks to specified target DataNodes to fulfill the block |
| * storage policy. |
| * |
| * Upon receiving this command, this DataNode pass the array of block movement |
| * details to |
| * {@link org.apache.hadoop.hdfs.server.sps.ExternalSPSBlockMoveTaskHandler} |
| * service. Later, ExternalSPSBlockMoveTaskHandler will schedule block movement |
| * tasks for these blocks and monitors the completion of each task. After the |
| * block movement attempt is finished(with success or failure) this DataNode |
| * will send response back to NameNode about the block movement attempt |
| * finished details. |
| */ |
| public class BlockStorageMovementCommand extends DatanodeCommand { |
| private final String blockPoolId; |
| private final Collection<BlockMovingInfo> blockMovingTasks; |
| |
| /** |
| * Block storage movement command constructor. |
| * |
| * @param action |
| * protocol specific action |
| * @param blockMovingInfos |
| * block to storage info that will be used for movement |
| */ |
| public BlockStorageMovementCommand(int action, String blockPoolId, |
| Collection<BlockMovingInfo> blockMovingInfos) { |
| super(action); |
| this.blockPoolId = blockPoolId; |
| this.blockMovingTasks = blockMovingInfos; |
| } |
| |
| /** |
| * Returns block pool ID. |
| */ |
| public String getBlockPoolId() { |
| return blockPoolId; |
| } |
| |
| /** |
| * Returns the list of blocks to be moved. |
| */ |
| public Collection<BlockMovingInfo> getBlockMovingTasks() { |
| return blockMovingTasks; |
| } |
| |
| /** |
| * Stores block to storage info that can be used for block movement. |
| */ |
| public static class BlockMovingInfo { |
| private Block blk; |
| private DatanodeInfo sourceNode; |
| private DatanodeInfo targetNode; |
| private StorageType sourceStorageType; |
| private StorageType targetStorageType; |
| |
| /** |
| * Block to storage info constructor. |
| * |
| * @param block |
| * block info |
| * @param sourceDnInfo |
| * node that can be the source of a block move |
| * @param srcStorageType |
| * type of source storage media |
| */ |
| public BlockMovingInfo(Block block, DatanodeInfo sourceDnInfo, |
| DatanodeInfo targetDnInfo, StorageType srcStorageType, |
| StorageType targetStorageType) { |
| this.blk = block; |
| this.sourceNode = sourceDnInfo; |
| this.targetNode = targetDnInfo; |
| this.sourceStorageType = srcStorageType; |
| this.targetStorageType = targetStorageType; |
| } |
| |
| public void addBlock(Block block) { |
| this.blk = block; |
| } |
| |
| public Block getBlock() { |
| return blk; |
| } |
| |
| public DatanodeInfo getSource() { |
| return sourceNode; |
| } |
| |
| public DatanodeInfo getTarget() { |
| return targetNode; |
| } |
| |
| public StorageType getTargetStorageType() { |
| return targetStorageType; |
| } |
| |
| public StorageType getSourceStorageType() { |
| return sourceStorageType; |
| } |
| |
| @Override |
| public String toString() { |
| return new StringBuilder().append("BlockMovingInfo(\n ") |
| .append("Moving block: ").append(blk).append(" From: ") |
| .append(sourceNode).append(" To: [").append(targetNode).append("\n ") |
| .append(" sourceStorageType: ").append(sourceStorageType) |
| .append(" targetStorageType: ").append(targetStorageType).append(")") |
| .toString(); |
| } |
| } |
| } |