| /** |
| * 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.util.ArrayList; |
| import java.util.List; |
| import java.util.concurrent.atomic.AtomicLong; |
| |
| import org.apache.hadoop.classification.InterfaceAudience; |
| import org.apache.hadoop.classification.InterfaceStability; |
| import org.apache.hadoop.conf.Configurable; |
| import org.apache.hadoop.conf.Configuration; |
| import org.apache.hadoop.fs.FileStatus; |
| |
| /** |
| * Resolver mapping all files to a configurable, uniform blocksize. |
| */ |
| @InterfaceAudience.Public |
| @InterfaceStability.Unstable |
| public class FixedBlockResolver extends BlockResolver implements Configurable { |
| |
| public static final String BLOCKSIZE = |
| "hdfs.image.writer.resolver.fixed.block.size"; |
| public static final String START_BLOCK = |
| "hdfs.image.writer.resolver.fixed.block.start"; |
| public static final long BLOCKSIZE_DEFAULT = 256 * (1L << 20); |
| |
| private Configuration conf; |
| private long blocksize = 256 * (1L << 20); |
| private final AtomicLong blockIds = new AtomicLong(0); |
| |
| @Override |
| public void setConf(Configuration conf) { |
| this.conf = conf; |
| blocksize = conf.getLong(BLOCKSIZE, BLOCKSIZE_DEFAULT); |
| blockIds.set(conf.getLong(START_BLOCK, (1L << 30))); |
| } |
| |
| @Override |
| public Configuration getConf() { |
| return conf; |
| } |
| |
| @Override |
| protected List<Long> blockLengths(FileStatus s) { |
| ArrayList<Long> ret = new ArrayList<>(); |
| if (!s.isFile()) { |
| return ret; |
| } |
| if (0 == s.getLen()) { |
| // the file has length 0; so we will have one block of size 0 |
| ret.add(0L); |
| return ret; |
| } |
| int nblocks = (int)((s.getLen() - 1) / blocksize) + 1; |
| for (int i = 0; i < nblocks - 1; ++i) { |
| ret.add(blocksize); |
| } |
| long rem = s.getLen() % blocksize; |
| ret.add(0 == (rem % blocksize) ? blocksize : rem); |
| return ret; |
| } |
| |
| @Override |
| public long nextId() { |
| return blockIds.incrementAndGet(); |
| } |
| |
| @Override |
| public long lastId() { |
| return blockIds.get(); |
| } |
| |
| @Override |
| public long preferredBlockSize(FileStatus s) { |
| return blocksize; |
| } |
| |
| @Override |
| public int getReplication(FileStatus s) { |
| return 1; |
| } |
| } |