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

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  public void testPluggableTrash() throws IOException {
    Configuration conf = new Configuration();


    // Test plugged TrashPolicy
    conf.setClass("fs.trash.classname", TestTrashPolicy.class, TrashPolicy.class);
    Trash trash = new Trash(conf);
    assertTrue(trash.getTrashPolicy().getClass().equals(TestTrashPolicy.class));
  }

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  protected void trashEmptier(FileSystem fs, Configuration conf) throws Exception {
    // Trash with 12 second deletes and 6 seconds checkpoints
    conf.set("fs.trash.interval", "0.2"); // 12 seconds
    conf.set("fs.trash.checkpoint.interval", "0.1"); // 6 seconds
    Trash trash = new Trash(conf);
    // clean up trash can
    fs.delete(trash.getCurrentTrashDir().getParent(), true);


    // Start Emptier in background
    Runnable emptier = trash.getEmptier();
    Thread emptierThread = new Thread(emptier);
    emptierThread.start();


    FsShell shell = new FsShell();
    shell.setConf(conf);

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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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    }


    @Override
    protected void processArguments(LinkedList<PathData> args)
    throws IOException {
      Trash trash = new Trash(getConf());
      trash.expunge();
      trash.checkpoint();    
    }

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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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    // 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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    // 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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    log.info("verbose: " + verbose);
    log.info("trash enabled: " + !noTrash);
    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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