Examples of org.apache.hadoop.fs.Trash

org.apache.hadoop.fs.Trash
Provides a trash feature. Files are moved to a user's trash directory, a subdirectory of their home directory named ".Trash". Files are initially moved to a current sub-directory of the trash directory. Within that sub-directory their original path is preserved. Periodically one may checkpoint the current trash and remove older checkpoints. (This design permits trash management without enumeration of the full trash content, without date support in the filesystem, and without clock synchronization.)

          
          rename(fs, tmpDatafile, newDatafile);
          
          // start deleting files, if we do not finish they will be cleaned
          // up later
          Trash trash = new Trash(fs, fs.getConf());
          for (Path path : oldDatafiles) {
            Path deleteFile = new Path(location + "/delete+" + compactName + "+" + path.getName());
            if (!trash.moveToTrash(deleteFile))
              fs.delete(deleteFile, true);
          }
        }
        
        // atomically remove old files and add new file

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          @Override
          public FileSystem run() throws IOException {
            return FileSystem.get(conf);
          }
        });
    this.emptier = new Thread(new Trash(fs, conf).getEmptier(), "Trash Emptier");
    this.emptier.setDaemon(true);
    this.emptier.start();
  }

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    myMetrics = new NameNodeMetrics(conf, this);


    this.namesystem = new FSNamesystem(this, conf);
    this.server.start();  //start RPC server   


    this.emptier = new Thread(new Trash(conf).getEmptier(), "Trash Emptier");
    this.emptier.setDaemon(true);
    this.emptier.start();
  }

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    log.info("offline: " + offline);
    log.info("verbose: " + verbose);
    log.info("memory threshold: " + CANDIDATE_MEMORY_PERCENTAGE + " of " + Runtime.getRuntime().maxMemory() + " bytes");
    log.info("delete threads: " + numDeleteThreads);
    if (!noTrash) {
      this.trash = new Trash(fs, fs.getConf());
    }
  }

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  GarbageCollectWriteAheadLogs(Instance instance, FileSystem fs, boolean noTrash) throws IOException {
    this.instance = instance;
    this.fs = fs;
    if (!noTrash)
      this.trash = new Trash(fs, fs.getConf());
  }

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            log.info("Archiving walog " + source + " to " + dest);
            if (!fs.rename(new Path(source), new Path(dest)))
              log.error("rename is unsuccessful");
          } else {
            log.info("Deleting walog " + filename);
            Trash trash = new Trash(fs, fs.getConf());
            Path sourcePath = new Path(source);
            if (!trash.moveToTrash(sourcePath) && !fs.delete(sourcePath, true))
              log.warn("Failed to delete walog " + source);
            Path recoveryPath = new Path(Constants.getRecoveryDir(acuConf), filename);
            try {
              if (trash.moveToTrash(recoveryPath) || fs.delete(recoveryPath, true))
                log.info("Deleted any recovery log " + filename);
            } catch (FileNotFoundException ex) {
              // ignore
            }

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          if (!fs.rename(tmpDatafile, newDatafile))
            log.warn("Rename of " + tmpDatafile + " to " + newDatafile + " returned false");
          
          // start deleting files, if we do not finish they will be cleaned
          // up later
          Trash trash = new Trash(fs, fs.getConf());
          for (Path path : oldDatafiles) {
            Path deleteFile = new Path(location + "/delete+" + compactName + "+" + path.getName());
            if (!trash.moveToTrash(deleteFile))
              fs.delete(deleteFile, true);
          }
        }
        
        // atomically remove old files and add new file

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  }


  @Override
  public boolean moveToTrash(Path path) throws IOException {
    FileSystem fs = getVolumeByPath(path).getFileSystem();
    Trash trash = new Trash(fs, fs.getConf());
    return trash.moveToTrash(path);
  }

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    myMetrics = new NameNodeMetrics(conf, this);


    this.namesystem = new FSNamesystem(this, conf);
    this.server.start();  //start RPC server   


    this.emptier = new Thread(new Trash(conf).getEmptier(), "Trash Emptier");
    this.emptier.setDaemon(true);
    this.emptier.start();
  }

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    // Path or FileSystem. So need to achieve this by creating a dummy conf.
    // this needs to be filtered out based on version


    Configuration dupConf = new Configuration(conf);
    FileSystem.setDefaultUri(dupConf, fs.getUri());
    Trash trash = new Trash(dupConf);
    return trash.moveToTrash(path);
  }

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