001 /**
002 * Licensed to the Apache Software Foundation (ASF) under one
003 * or more contributor license agreements. See the NOTICE file
004 * distributed with this work for additional information
005 * regarding copyright ownership. The ASF licenses this file
006 * to you under the Apache License, Version 2.0 (the
007 * "License"); you may not use this file except in compliance
008 * with the License. You may obtain a copy of the License at
009 *
010 * http://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing, software
013 * distributed under the License is distributed on an "AS IS" BASIS,
014 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
015 * See the License for the specific language governing permissions and
016 * limitations under the License.
017 */
018
019 package org.apache.hadoop.fs;
020
021 import java.io.*;
022 import java.net.URI;
023 import java.util.*;
024
025 import org.apache.hadoop.classification.InterfaceAudience;
026 import org.apache.hadoop.classification.InterfaceStability;
027 import org.apache.hadoop.conf.Configuration;
028
029 /****************************************************************
030 * Implement the FileSystem API for the checksumed local filesystem.
031 *
032 *****************************************************************/
033 @InterfaceAudience.Public
034 @InterfaceStability.Stable
035 public class LocalFileSystem extends ChecksumFileSystem {
036 static final URI NAME = URI.create("file:///");
037 static private Random rand = new Random();
038
039 public LocalFileSystem() {
040 this(new RawLocalFileSystem());
041 }
042
043 @Override
044 public void initialize(URI name, Configuration conf) throws IOException {
045 if (fs.getConf() == null) {
046 fs.initialize(name, conf);
047 }
048 String scheme = name.getScheme();
049 if (!scheme.equals(fs.getUri().getScheme())) {
050 swapScheme = scheme;
051 }
052 }
053
054 public FileSystem getRaw() {
055 return getRawFileSystem();
056 }
057
058 public LocalFileSystem(FileSystem rawLocalFileSystem) {
059 super(rawLocalFileSystem);
060 }
061
062 /** Convert a path to a File. */
063 public File pathToFile(Path path) {
064 return ((RawLocalFileSystem)fs).pathToFile(path);
065 }
066
067 @Override
068 public void copyFromLocalFile(boolean delSrc, Path src, Path dst)
069 throws IOException {
070 FileUtil.copy(this, src, this, dst, delSrc, getConf());
071 }
072
073 @Override
074 public void copyToLocalFile(boolean delSrc, Path src, Path dst)
075 throws IOException {
076 FileUtil.copy(this, src, this, dst, delSrc, getConf());
077 }
078
079 /**
080 * Moves files to a bad file directory on the same device, so that their
081 * storage will not be reused.
082 */
083 public boolean reportChecksumFailure(Path p, FSDataInputStream in,
084 long inPos,
085 FSDataInputStream sums, long sumsPos) {
086 try {
087 // canonicalize f
088 File f = ((RawLocalFileSystem)fs).pathToFile(p).getCanonicalFile();
089
090 // find highest writable parent dir of f on the same device
091 String device = new DF(f, getConf()).getMount();
092 File parent = f.getParentFile();
093 File dir = null;
094 while (parent!=null && parent.canWrite() && parent.toString().startsWith(device)) {
095 dir = parent;
096 parent = parent.getParentFile();
097 }
098
099 if (dir==null) {
100 throw new IOException(
101 "not able to find the highest writable parent dir");
102 }
103
104 // move the file there
105 File badDir = new File(dir, "bad_files");
106 if (!badDir.mkdirs()) {
107 if (!badDir.isDirectory()) {
108 throw new IOException("Mkdirs failed to create " + badDir.toString());
109 }
110 }
111 String suffix = "." + rand.nextInt();
112 File badFile = new File(badDir, f.getName()+suffix);
113 LOG.warn("Moving bad file " + f + " to " + badFile);
114 in.close(); // close it first
115 boolean b = f.renameTo(badFile); // rename it
116 if (!b) {
117 LOG.warn("Ignoring failure of renameTo");
118 }
119 // move checksum file too
120 File checkFile = ((RawLocalFileSystem)fs).pathToFile(getChecksumFile(p));
121 b = checkFile.renameTo(new File(badDir, checkFile.getName()+suffix));
122 if (!b) {
123 LOG.warn("Ignoring failure of renameTo");
124 }
125 } catch (IOException e) {
126 LOG.warn("Error moving bad file " + p + ": " + e);
127 }
128 return false;
129 }
130 }