| /** |
| * 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.util.Collections; |
| import java.util.List; |
| |
| import org.apache.hadoop.hdfs.protocol.Block; |
| import org.apache.hadoop.hdfs.server.blockmanagement.BlockInfo; |
| import org.apache.hadoop.hdfs.server.common.HdfsServerConstants; |
| 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; |
| |
| /** A list of FileDiffs for storing snapshot data. */ |
| public class FileDiffList extends |
| AbstractINodeDiffList<INodeFile, INodeFileAttributes, FileDiff> { |
| |
| @Override |
| FileDiff createDiff(int snapshotId, INodeFile file) { |
| return new FileDiff(snapshotId, file); |
| } |
| |
| @Override |
| INodeFileAttributes createSnapshotCopy(INodeFile currentINode) { |
| return new INodeFileAttributes.SnapshotCopy(currentINode); |
| } |
| |
| public void destroyAndCollectSnapshotBlocks( |
| BlocksMapUpdateInfo collectedBlocks) { |
| for (FileDiff d : asList()) { |
| d.destroyAndCollectSnapshotBlocks(collectedBlocks); |
| } |
| } |
| |
| public void saveSelf2Snapshot(int latestSnapshotId, INodeFile iNodeFile, |
| INodeFileAttributes snapshotCopy, boolean withBlocks) { |
| final FileDiff diff = |
| super.saveSelf2Snapshot(latestSnapshotId, iNodeFile, snapshotCopy); |
| if (withBlocks) { // Store blocks if this is the first update |
| diff.setBlocks(iNodeFile.getBlocks()); |
| } |
| } |
| |
| public BlockInfo[] findEarlierSnapshotBlocks(int snapshotId) { |
| assert snapshotId != Snapshot.NO_SNAPSHOT_ID : "Wrong snapshot id"; |
| if (snapshotId == Snapshot.CURRENT_STATE_ID) { |
| return null; |
| } |
| List<FileDiff> diffs = this.asList(); |
| int i = Collections.binarySearch(diffs, snapshotId); |
| BlockInfo[] blocks = null; |
| for(i = i >= 0 ? i : -i-2; i >= 0; i--) { |
| blocks = diffs.get(i).getBlocks(); |
| if(blocks != null) { |
| break; |
| } |
| } |
| return blocks; |
| } |
| |
| public BlockInfo[] findLaterSnapshotBlocks(int snapshotId) { |
| assert snapshotId != Snapshot.NO_SNAPSHOT_ID : "Wrong snapshot id"; |
| if (snapshotId == Snapshot.CURRENT_STATE_ID) { |
| return null; |
| } |
| List<FileDiff> diffs = this.asList(); |
| int i = Collections.binarySearch(diffs, snapshotId); |
| BlockInfo[] blocks = null; |
| for (i = i >= 0 ? i+1 : -i-1; i < diffs.size(); i++) { |
| blocks = diffs.get(i).getBlocks(); |
| if (blocks != null) { |
| break; |
| } |
| } |
| return blocks; |
| } |
| |
| /** |
| * Copy blocks from the removed snapshot into the previous snapshot |
| * up to the file length of the latter. |
| * Collect unused blocks of the removed snapshot. |
| */ |
| void combineAndCollectSnapshotBlocks( |
| INode.ReclaimContext reclaimContext, INodeFile file, FileDiff removed) { |
| BlockInfo[] removedBlocks = removed.getBlocks(); |
| if (removedBlocks == null) { |
| FileWithSnapshotFeature sf = file.getFileWithSnapshotFeature(); |
| assert sf != null : "FileWithSnapshotFeature is null"; |
| if(sf.isCurrentFileDeleted()) |
| sf.collectBlocksAndClear(reclaimContext, file); |
| return; |
| } |
| int p = getPrior(removed.getSnapshotId(), true); |
| FileDiff earlierDiff = p == Snapshot.NO_SNAPSHOT_ID ? null : getDiffById(p); |
| // Copy blocks to the previous snapshot if not set already |
| if (earlierDiff != null) { |
| earlierDiff.setBlocks(removedBlocks); |
| } |
| BlockInfo[] earlierBlocks = |
| (earlierDiff == null ? new BlockInfo[]{} : earlierDiff.getBlocks()); |
| // Find later snapshot (or file itself) with blocks |
| BlockInfo[] laterBlocks = findLaterSnapshotBlocks(removed.getSnapshotId()); |
| laterBlocks = (laterBlocks==null) ? file.getBlocks() : laterBlocks; |
| // Skip blocks, which belong to either the earlier or the later lists |
| int i = 0; |
| for(; i < removedBlocks.length; i++) { |
| if(i < earlierBlocks.length && removedBlocks[i] == earlierBlocks[i]) |
| continue; |
| if(i < laterBlocks.length && removedBlocks[i] == laterBlocks[i]) |
| continue; |
| break; |
| } |
| // Check if last block is part of truncate recovery |
| BlockInfo lastBlock = file.getLastBlock(); |
| Block dontRemoveBlock = null; |
| if (lastBlock != null && lastBlock.getBlockUCState().equals( |
| HdfsServerConstants.BlockUCState.UNDER_RECOVERY)) { |
| dontRemoveBlock = lastBlock.getUnderConstructionFeature() |
| .getTruncateBlock(); |
| } |
| // Collect the remaining blocks of the file, ignoring truncate block |
| for (;i < removedBlocks.length; i++) { |
| if(dontRemoveBlock == null || !removedBlocks[i].equals(dontRemoveBlock)) { |
| reclaimContext.collectedBlocks().addDeleteBlock(removedBlocks[i]); |
| } |
| } |
| } |
| } |