| /** |
| * 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 com.google.common.annotations.VisibleForTesting; |
| import com.google.common.base.Preconditions; |
| import com.google.common.collect.Lists; |
| |
| import org.apache.hadoop.fs.StorageType; |
| import org.apache.hadoop.fs.XAttr; |
| import org.apache.hadoop.hdfs.XAttrHelper; |
| import org.apache.hadoop.hdfs.protocol.BlockStoragePolicy; |
| import org.apache.hadoop.hdfs.protocol.HdfsConstants; |
| import org.apache.hadoop.util.StringUtils; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import java.util.List; |
| |
| /** A collection of block storage policies. */ |
| public class BlockStoragePolicySuite { |
| static final Logger LOG = LoggerFactory.getLogger(BlockStoragePolicySuite |
| .class); |
| |
| public static final String STORAGE_POLICY_XATTR_NAME |
| = "hsm.block.storage.policy.id"; |
| public static final XAttr.NameSpace XAttrNS = XAttr.NameSpace.SYSTEM; |
| |
| public static final int ID_BIT_LENGTH = 4; |
| |
| @VisibleForTesting |
| public static BlockStoragePolicySuite createDefaultSuite() { |
| final BlockStoragePolicy[] policies = |
| new BlockStoragePolicy[1 << ID_BIT_LENGTH]; |
| final byte lazyPersistId = HdfsConstants.MEMORY_STORAGE_POLICY_ID; |
| policies[lazyPersistId] = new BlockStoragePolicy(lazyPersistId, |
| HdfsConstants.MEMORY_STORAGE_POLICY_NAME, |
| new StorageType[]{StorageType.RAM_DISK, StorageType.DISK}, |
| new StorageType[]{StorageType.DISK}, |
| new StorageType[]{StorageType.DISK}, |
| true); // Cannot be changed on regular files, but inherited. |
| final byte allssdId = HdfsConstants.ALLSSD_STORAGE_POLICY_ID; |
| policies[allssdId] = new BlockStoragePolicy(allssdId, |
| HdfsConstants.ALLSSD_STORAGE_POLICY_NAME, |
| new StorageType[]{StorageType.SSD}, |
| new StorageType[]{StorageType.DISK}, |
| new StorageType[]{StorageType.DISK}); |
| final byte onessdId = HdfsConstants.ONESSD_STORAGE_POLICY_ID; |
| policies[onessdId] = new BlockStoragePolicy(onessdId, |
| HdfsConstants.ONESSD_STORAGE_POLICY_NAME, |
| new StorageType[]{StorageType.SSD, StorageType.DISK}, |
| new StorageType[]{StorageType.SSD, StorageType.DISK}, |
| new StorageType[]{StorageType.SSD, StorageType.DISK}); |
| final byte hotId = HdfsConstants.HOT_STORAGE_POLICY_ID; |
| policies[hotId] = new BlockStoragePolicy(hotId, |
| HdfsConstants.HOT_STORAGE_POLICY_NAME, |
| new StorageType[]{StorageType.DISK}, StorageType.EMPTY_ARRAY, |
| new StorageType[]{StorageType.ARCHIVE}); |
| final byte warmId = HdfsConstants.WARM_STORAGE_POLICY_ID; |
| policies[warmId] = new BlockStoragePolicy(warmId, |
| HdfsConstants.WARM_STORAGE_POLICY_NAME, |
| new StorageType[]{StorageType.DISK, StorageType.ARCHIVE}, |
| new StorageType[]{StorageType.DISK, StorageType.ARCHIVE}, |
| new StorageType[]{StorageType.DISK, StorageType.ARCHIVE}); |
| final byte coldId = HdfsConstants.COLD_STORAGE_POLICY_ID; |
| policies[coldId] = new BlockStoragePolicy(coldId, |
| HdfsConstants.COLD_STORAGE_POLICY_NAME, |
| new StorageType[]{StorageType.ARCHIVE}, StorageType.EMPTY_ARRAY, |
| StorageType.EMPTY_ARRAY); |
| return new BlockStoragePolicySuite(hotId, policies); |
| } |
| |
| private final byte defaultPolicyID; |
| private final BlockStoragePolicy[] policies; |
| |
| public BlockStoragePolicySuite(byte defaultPolicyID, |
| BlockStoragePolicy[] policies) { |
| this.defaultPolicyID = defaultPolicyID; |
| this.policies = policies; |
| } |
| |
| /** @return the corresponding policy. */ |
| public BlockStoragePolicy getPolicy(byte id) { |
| // id == 0 means policy not specified. |
| return id == 0? getDefaultPolicy(): policies[id]; |
| } |
| |
| /** @return the default policy. */ |
| public BlockStoragePolicy getDefaultPolicy() { |
| return getPolicy(defaultPolicyID); |
| } |
| |
| public BlockStoragePolicy getPolicy(String policyName) { |
| Preconditions.checkNotNull(policyName); |
| |
| if (policies != null) { |
| for (BlockStoragePolicy policy : policies) { |
| if (policy != null && policy.getName().equalsIgnoreCase(policyName)) { |
| return policy; |
| } |
| } |
| } |
| return null; |
| } |
| |
| public BlockStoragePolicy[] getAllPolicies() { |
| List<BlockStoragePolicy> list = Lists.newArrayList(); |
| if (policies != null) { |
| for (BlockStoragePolicy policy : policies) { |
| if (policy != null) { |
| list.add(policy); |
| } |
| } |
| } |
| return list.toArray(new BlockStoragePolicy[list.size()]); |
| } |
| |
| public static String buildXAttrName() { |
| return StringUtils.toLowerCase(XAttrNS.toString()) |
| + "." + STORAGE_POLICY_XATTR_NAME; |
| } |
| |
| public static XAttr buildXAttr(byte policyId) { |
| final String name = buildXAttrName(); |
| return XAttrHelper.buildXAttr(name, new byte[]{policyId}); |
| } |
| |
| public static String getStoragePolicyXAttrPrefixedName() { |
| return XAttrHelper.getPrefixedName(XAttrNS, STORAGE_POLICY_XATTR_NAME); |
| } |
| } |