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    
028    /****************************************************************
029     * Implement the FileSystem API for the checksumed local filesystem.
030     *
031     *****************************************************************/
032    @InterfaceAudience.Public
033    @InterfaceStability.Stable
034    public class LocalFileSystem extends ChecksumFileSystem {
035      static final URI NAME = URI.create("file:///");
036      static private Random rand = new Random();
037      FileSystem rfs;
038      
039      public LocalFileSystem() {
040        this(new RawLocalFileSystem());
041      }
042      
043      public FileSystem getRaw() {
044        return rfs;
045      }
046        
047      public LocalFileSystem(FileSystem rawLocalFileSystem) {
048        super(rawLocalFileSystem);
049        rfs = rawLocalFileSystem;
050      }
051        
052      /** Convert a path to a File. */
053      public File pathToFile(Path path) {
054        return ((RawLocalFileSystem)fs).pathToFile(path);
055      }
056    
057      @Override
058      public void copyFromLocalFile(boolean delSrc, Path src, Path dst)
059        throws IOException {
060        FileUtil.copy(this, src, this, dst, delSrc, getConf());
061      }
062    
063      @Override
064      public void copyToLocalFile(boolean delSrc, Path src, Path dst)
065        throws IOException {
066        FileUtil.copy(this, src, this, dst, delSrc, getConf());
067      }
068    
069      /**
070       * Moves files to a bad file directory on the same device, so that their
071       * storage will not be reused.
072       */
073      public boolean reportChecksumFailure(Path p, FSDataInputStream in,
074                                           long inPos,
075                                           FSDataInputStream sums, long sumsPos) {
076        try {
077          // canonicalize f
078          File f = ((RawLocalFileSystem)fs).pathToFile(p).getCanonicalFile();
079          
080          // find highest writable parent dir of f on the same device
081          String device = new DF(f, getConf()).getMount();
082          File parent = f.getParentFile();
083          File dir = null;
084          while (parent!=null && parent.canWrite() && parent.toString().startsWith(device)) {
085            dir = parent;
086            parent = parent.getParentFile();
087          }
088    
089          if (dir==null) {
090            throw new IOException(
091                                  "not able to find the highest writable parent dir");
092          }
093            
094          // move the file there
095          File badDir = new File(dir, "bad_files");
096          if (!badDir.mkdirs()) {
097            if (!badDir.isDirectory()) {
098              throw new IOException("Mkdirs failed to create " + badDir.toString());
099            }
100          }
101          String suffix = "." + rand.nextInt();
102          File badFile = new File(badDir, f.getName()+suffix);
103          LOG.warn("Moving bad file " + f + " to " + badFile);
104          in.close();                               // close it first
105          boolean b = f.renameTo(badFile);                      // rename it
106          if (!b) {
107            LOG.warn("Ignoring failure of renameTo");
108          }
109          // move checksum file too
110          File checkFile = ((RawLocalFileSystem)fs).pathToFile(getChecksumFile(p));
111          b = checkFile.renameTo(new File(badDir, checkFile.getName()+suffix));
112          if (!b) {
113              LOG.warn("Ignoring failure of renameTo");
114            }
115        } catch (IOException e) {
116          LOG.warn("Error moving bad file " + p + ": " + e);
117        }
118        return false;
119      }
120    }