| /** |
| * 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 org.apache.hadoop.thirdparty.com.google.common.base.Preconditions; |
| import org.apache.hadoop.classification.InterfaceAudience; |
| import org.apache.hadoop.fs.StorageType; |
| import org.apache.hadoop.hdfs.protocol.Block; |
| import org.apache.hadoop.hdfs.protocol.BlockType; |
| |
| /** |
| * Subclass of {@link BlockInfo}, used for a block with replication scheme. |
| */ |
| @InterfaceAudience.Private |
| public class BlockInfoContiguous extends BlockInfo { |
| |
| public BlockInfoContiguous(short size) { |
| super(size); |
| } |
| |
| public BlockInfoContiguous(Block blk, short size) { |
| super(blk, size); |
| } |
| |
| /** |
| * Ensure that there is enough space to include num more triplets. |
| * @return first free triplet index. |
| */ |
| private int ensureCapacity(int num) { |
| assert this.triplets != null : "BlockInfo is not initialized"; |
| int last = numNodes(); |
| if (triplets.length >= (last+num)*3) { |
| return last; |
| } |
| /* Not enough space left. Create a new array. Should normally |
| * happen only when replication is manually increased by the user. */ |
| Object[] old = triplets; |
| triplets = new Object[(last+num)*3]; |
| System.arraycopy(old, 0, triplets, 0, last * 3); |
| return last; |
| } |
| |
| @Override |
| boolean addStorage(DatanodeStorageInfo storage, Block reportedBlock) { |
| Preconditions.checkArgument(this.getBlockId() == reportedBlock.getBlockId(), |
| "reported blk_%s is different from stored blk_%s", |
| reportedBlock.getBlockId(), this.getBlockId()); |
| // find the last null node |
| int lastNode = ensureCapacity(1); |
| setStorageInfo(lastNode, storage); |
| setNext(lastNode, null); |
| setPrevious(lastNode, null); |
| return true; |
| } |
| |
| @Override |
| boolean removeStorage(DatanodeStorageInfo storage) { |
| int dnIndex = findStorageInfo(storage); |
| if (dnIndex < 0) { // the node is not found |
| return false; |
| } |
| assert getPrevious(dnIndex) == null && getNext(dnIndex) == null : |
| "Block is still in the list and must be removed first."; |
| // find the last not null node |
| int lastNode = numNodes()-1; |
| // replace current node triplet by the lastNode one |
| setStorageInfo(dnIndex, getStorageInfo(lastNode)); |
| setNext(dnIndex, getNext(lastNode)); |
| setPrevious(dnIndex, getPrevious(lastNode)); |
| // set the last triplet to null |
| setStorageInfo(lastNode, null); |
| setNext(lastNode, null); |
| setPrevious(lastNode, null); |
| return true; |
| } |
| |
| @Override |
| boolean isProvided() { |
| int len = getCapacity(); |
| for (int idx = 0; idx < len; idx++) { |
| DatanodeStorageInfo storage = getStorageInfo(idx); |
| if (storage != null |
| && storage.getStorageType().equals(StorageType.PROVIDED)) { |
| return true; |
| } |
| } |
| return false; |
| } |
| |
| @Override |
| public int numNodes() { |
| assert this.triplets != null : "BlockInfo is not initialized"; |
| assert triplets.length % 3 == 0 : "Malformed BlockInfo"; |
| |
| for (int idx = getCapacity()-1; idx >= 0; idx--) { |
| if (getDatanode(idx) != null) { |
| return idx + 1; |
| } |
| } |
| return 0; |
| } |
| |
| @Override |
| public final boolean isStriped() { |
| return false; |
| } |
| |
| @Override |
| public BlockType getBlockType() { |
| return BlockType.CONTIGUOUS; |
| } |
| |
| @Override |
| final boolean hasNoStorage() { |
| return getStorageInfo(0) == null; |
| } |
| } |