| /** |
| * 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.fs; |
| |
| import java.io.*; |
| import java.net.URI; |
| import java.util.*; |
| |
| /**************************************************************** |
| * Implement the FileSystem API for the checksumed local filesystem. |
| * |
| *****************************************************************/ |
| public class LocalFileSystem extends ChecksumFileSystem { |
| static final URI NAME = URI.create("file:///"); |
| static private Random rand = new Random(); |
| FileSystem rfs; |
| |
| public LocalFileSystem() { |
| this(new RawLocalFileSystem()); |
| } |
| |
| public FileSystem getRaw() { |
| return rfs; |
| } |
| |
| public LocalFileSystem(FileSystem rawLocalFileSystem) { |
| super(rawLocalFileSystem); |
| rfs = rawLocalFileSystem; |
| } |
| |
| /** |
| * Get file status. |
| */ |
| public boolean exists(Path f) throws IOException { |
| File path = pathToFile(f); |
| if (path.exists()) { |
| return true; |
| } else { |
| return false; |
| } |
| } |
| |
| /** Convert a path to a File. */ |
| public File pathToFile(Path path) { |
| return ((RawLocalFileSystem)fs).pathToFile(path); |
| } |
| |
| @Override |
| public void copyFromLocalFile(boolean delSrc, Path src, Path dst) |
| throws IOException { |
| FileUtil.copy(this, src, this, dst, delSrc, getConf()); |
| } |
| |
| @Override |
| public void copyToLocalFile(boolean delSrc, Path src, Path dst) |
| throws IOException { |
| FileUtil.copy(this, src, this, dst, delSrc, getConf()); |
| } |
| |
| /** |
| * Moves files to a bad file directory on the same device, so that their |
| * storage will not be reused. |
| */ |
| public boolean reportChecksumFailure(Path p, FSDataInputStream in, |
| long inPos, |
| FSDataInputStream sums, long sumsPos) { |
| try { |
| // canonicalize f |
| File f = ((RawLocalFileSystem)fs).pathToFile(p).getCanonicalFile(); |
| |
| // find highest writable parent dir of f on the same device |
| String device = new DF(f, getConf()).getMount(); |
| File parent = f.getParentFile(); |
| File dir = null; |
| while (parent!=null && parent.canWrite() && parent.toString().startsWith(device)) { |
| dir = parent; |
| parent = parent.getParentFile(); |
| } |
| |
| if (dir==null) { |
| throw new IOException( |
| "not able to find the highest writable parent dir"); |
| } |
| |
| // move the file there |
| File badDir = new File(dir, "bad_files"); |
| if (!badDir.mkdirs()) { |
| if (!badDir.isDirectory()) { |
| throw new IOException("Mkdirs failed to create " + badDir.toString()); |
| } |
| } |
| String suffix = "." + rand.nextInt(); |
| File badFile = new File(badDir, f.getName()+suffix); |
| LOG.warn("Moving bad file " + f + " to " + badFile); |
| in.close(); // close it first |
| f.renameTo(badFile); // rename it |
| |
| // move checksum file too |
| File checkFile = ((RawLocalFileSystem)fs).pathToFile(getChecksumFile(p)); |
| checkFile.renameTo(new File(badDir, checkFile.getName()+suffix)); |
| |
| } catch (IOException e) { |
| LOG.warn("Error moving bad file " + p + ": " + e); |
| } |
| return false; |
| } |
| } |