| /** |
| * 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.namenode.snapshot; |
| |
| import java.io.DataOutput; |
| import java.io.IOException; |
| import java.util.Arrays; |
| |
| import org.apache.hadoop.hdfs.server.blockmanagement.BlockInfo; |
| import org.apache.hadoop.hdfs.server.namenode.FSImageSerialization; |
| import org.apache.hadoop.hdfs.server.namenode.INode; |
| import org.apache.hadoop.hdfs.server.namenode.INode.BlocksMapUpdateInfo; |
| import org.apache.hadoop.hdfs.server.namenode.INodeFile; |
| import org.apache.hadoop.hdfs.server.namenode.INodeFileAttributes; |
| import org.apache.hadoop.hdfs.server.namenode.snapshot.SnapshotFSImageFormat.ReferenceMap; |
| |
| /** |
| * The difference of an {@link INodeFile} between two snapshots. |
| */ |
| public class FileDiff extends |
| AbstractINodeDiff<INodeFile, INodeFileAttributes, FileDiff> { |
| |
| /** The file size at snapshot creation time. */ |
| private final long fileSize; |
| /** A copy of the INodeFile block list. Used in truncate. */ |
| private BlockInfo[] blocks; |
| |
| FileDiff(int snapshotId, INodeFile file) { |
| super(snapshotId, null, null); |
| fileSize = file.computeFileSize(); |
| blocks = null; |
| } |
| |
| /** Constructor used by FSImage loading */ |
| FileDiff(int snapshotId, INodeFileAttributes snapshotINode, |
| FileDiff posteriorDiff, long fileSize) { |
| super(snapshotId, snapshotINode, posteriorDiff); |
| this.fileSize = fileSize; |
| blocks = null; |
| } |
| |
| /** @return the file size in the snapshot. */ |
| public long getFileSize() { |
| return fileSize; |
| } |
| |
| /** |
| * Copy block references into the snapshot |
| * up to the current {@link #fileSize}. |
| * Should be done only once. |
| */ |
| public void setBlocks(BlockInfo[] blocks) { |
| if(this.blocks != null) |
| return; |
| int numBlocks = 0; |
| for(long s = 0; numBlocks < blocks.length && s < fileSize; numBlocks++) |
| s += blocks[numBlocks].getNumBytes(); |
| this.blocks = Arrays.copyOf(blocks, numBlocks); |
| } |
| |
| public BlockInfo[] getBlocks() { |
| return blocks; |
| } |
| |
| @Override |
| void combinePosteriorAndCollectBlocks( |
| INode.ReclaimContext reclaimContext, INodeFile currentINode, |
| FileDiff posterior) { |
| FileWithSnapshotFeature sf = currentINode.getFileWithSnapshotFeature(); |
| assert sf != null : "FileWithSnapshotFeature is null"; |
| sf.updateQuotaAndCollectBlocks(reclaimContext, currentINode, posterior); |
| } |
| |
| @Override |
| public String toString() { |
| return super.toString() + " fileSize=" + fileSize + ", rep=" |
| + (snapshotINode == null? "?": snapshotINode.getFileReplication()); |
| } |
| |
| @Override |
| void write(DataOutput out, ReferenceMap referenceMap) throws IOException { |
| writeSnapshot(out); |
| out.writeLong(fileSize); |
| |
| // write snapshotINode |
| if (snapshotINode != null) { |
| out.writeBoolean(true); |
| FSImageSerialization.writeINodeFileAttributes(snapshotINode, out); |
| } else { |
| out.writeBoolean(false); |
| } |
| } |
| |
| @Override |
| void destroyDiffAndCollectBlocks(INode.ReclaimContext reclaimContext, |
| INodeFile currentINode) { |
| currentINode.getFileWithSnapshotFeature().updateQuotaAndCollectBlocks( |
| reclaimContext, currentINode, this); |
| } |
| |
| public void destroyAndCollectSnapshotBlocks( |
| BlocksMapUpdateInfo collectedBlocks) { |
| if (blocks == null || collectedBlocks == null) { |
| return; |
| } |
| for (BlockInfo blk : blocks) { |
| collectedBlocks.addDeleteBlock(blk); |
| } |
| blocks = null; |
| } |
| } |