| /** |
| * 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; |
| |
| import java.io.IOException; |
| |
| import org.apache.hadoop.classification.InterfaceAudience; |
| import org.apache.hadoop.hdfs.server.blockmanagement.BlockInfo; |
| import org.apache.hadoop.hdfs.server.namenode.INode.BlocksMapUpdateInfo; |
| |
| /** |
| * Feature for under-construction file. |
| */ |
| @InterfaceAudience.Private |
| public class FileUnderConstructionFeature implements INode.Feature { |
| private String clientName; // lease holder |
| private final String clientMachine; |
| |
| public FileUnderConstructionFeature(final String clientName, final String clientMachine) { |
| this.clientName = clientName; |
| this.clientMachine = clientMachine; |
| } |
| |
| public String getClientName() { |
| return clientName; |
| } |
| |
| void setClientName(String clientName) { |
| this.clientName = clientName; |
| } |
| |
| public String getClientMachine() { |
| return clientMachine; |
| } |
| |
| /** |
| * Update the length for the last block |
| * |
| * @param lastBlockLength |
| * The length of the last block reported from client |
| * @throws IOException |
| */ |
| void updateLengthOfLastBlock(INodeFile f, long lastBlockLength) |
| throws IOException { |
| BlockInfo lastBlock = f.getLastBlock(); |
| assert (lastBlock != null) : "The last block for path " |
| + f.getFullPathName() + " is null when updating its length"; |
| assert !lastBlock.isComplete() |
| : "The last block for path " + f.getFullPathName() |
| + " is not under-construction when updating its length"; |
| lastBlock.setNumBytes(lastBlockLength); |
| } |
| |
| /** |
| * When deleting a file in the current fs directory, and the file is contained |
| * in a snapshot, we should delete the last block if it's under construction |
| * and its size is 0. |
| */ |
| void cleanZeroSizeBlock(final INodeFile f, |
| final BlocksMapUpdateInfo collectedBlocks) { |
| final BlockInfo[] blocks = f.getBlocks(); |
| if (blocks != null && blocks.length > 0 |
| && !blocks[blocks.length - 1].isComplete()) { |
| BlockInfo lastUC = blocks[blocks.length - 1]; |
| if (lastUC.getNumBytes() == 0) { |
| // this is a 0-sized block. do not need check its UC state here |
| collectedBlocks.addDeleteBlock(lastUC); |
| f.removeLastBlock(lastUC); |
| } |
| } |
| } |
| } |