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.)

      }
      try {
        f = writeFile(lfs, f);


        FileSystem.closeAll();
        Trash lTrash =
          new Trash(FileSystem.get(URI.create("file:///"), conf), conf);
        lTrash.moveToTrash(f.getParent());
        assertTrue(lfs.exists(new Path(lTrash.getCurrentTrashDir(), "foo/bar")));
      } finally {
        if (lfs.exists(p)) {
          lfs.delete(p, true);
        }
      }

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    } else if (trashInterval < 0) {
      throw new IOException("Cannot start tresh emptier with negative interval."
          + " Set " + CommonConfigurationKeys.FS_TRASH_INTERVAL_KEY + " to a"
          + " positive value.");
    }
    this.emptier = new Thread(new Trash(conf).getEmptier(), "Trash Emptier");
    this.emptier.setDaemon(true);
    this.emptier.start();
  }

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      }
    }
  }


  private void startTrashEmptier(Configuration conf) throws IOException {
    this.emptier = new Thread(new Trash(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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  private void startTrashEmptier(Configuration conf) throws IOException {
    long trashInterval = conf.getLong("fs.trash.interval", 0);
    if(trashInterval == 0)
      return;
    this.emptier = new Thread(new Trash(conf).getEmptier(), "Trash Emptier");
    this.emptier.setDaemon(true);
    this.emptier.start();
  }

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      //compare sorted lsr list and sorted dst list
      final Text lsrpath = new Text();
      final Text dstpath = new Text();
      final Text dstfrom = new Text();
      final Trash trash = new Trash(dstfs, conf);
      Path lastpath = null;


      boolean hasnext = dstin.next(dstpath, dstfrom);
      while (lsrin.next(lsrpath, NullWritable.get())) {
        int dst_cmp_lsr = dstpath.compareTo(lsrpath);
        while (hasnext && dst_cmp_lsr < 0) {
          hasnext = dstin.next(dstpath, dstfrom);
          dst_cmp_lsr = dstpath.compareTo(lsrpath);
        }
        
        if (dst_cmp_lsr == 0) {
          //lsrpath exists in dst, skip it
          hasnext = dstin.next(dstpath, dstfrom);
        } else {
          //lsrpath does not exist, delete it
          final Path rmpath = new Path(dstroot.getPath(), lsrpath.toString());
          ++deletedPathsCount;
          if ((lastpath == null || !isAncestorPath(lastpath, rmpath))) {
            if (!(trash.moveToTrash(rmpath) || dstfs.delete(rmpath, true))) {
              throw new IOException("Failed to delete " + rmpath);
            }
            lastpath = rmpath;
          }
        }

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      //compare sorted lsr list and sorted dst list
      final Text lsrpath = new Text();
      final Text dstpath = new Text();
      final Text dstfrom = new Text();
      final Trash trash = new Trash(dstfs, conf);
      Path lastpath = null;


      boolean hasnext = dstin.next(dstpath, dstfrom);
      while (lsrin.next(lsrpath, NullWritable.get())) {
        int dst_cmp_lsr = dstpath.compareTo(lsrpath);
        while (hasnext && dst_cmp_lsr < 0) {
          hasnext = dstin.next(dstpath, dstfrom);
          dst_cmp_lsr = dstpath.compareTo(lsrpath);
        }
        
        if (dst_cmp_lsr == 0) {
          //lsrpath exists in dst, skip it
          hasnext = dstin.next(dstpath, dstfrom);
        } else {
          //lsrpath does not exist, delete it
          final Path rmpath = new Path(dstroot.getPath(), lsrpath.toString());
          ++deletedPathsCount;
          if ((lastpath == null || !isAncestorPath(lastpath, rmpath))) {
            if (!(trash.moveToTrash(rmpath) || dstfs.delete(rmpath, true))) {
              throw new IOException("Failed to delete " + rmpath);
            }
            lastpath = rmpath;
          }
        }

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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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    }
    startTrashEmptier(conf);
  }


  private void startTrashEmptier(Configuration conf) throws IOException {
    this.emptier = new Thread(new Trash(conf).getEmptier(), "Trash Emptier");
    this.emptier.setDaemon(true);
    this.emptier.start();
  }

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    }
    startTrashEmptier(conf);
  }


  private void startTrashEmptier(Configuration conf) throws IOException {
    this.emptier = new Thread(new Trash(conf).getEmptier(), "Trash Emptier");
    this.emptier.setDaemon(true);
    this.emptier.start();
  }

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