Examples of org.apache.hadoop.fs.DF

org.apache.hadoop.fs.DF
Filesystem disk space usage statistics. Uses the unix 'df' program to get mount points, and java.io.File for space utilization. Tested on Linux, FreeBSD, Windows.

      if (!detachDir.mkdirs()) {
        if (!detachDir.isDirectory()) {
          throw new IOException("Mkdirs failed to create " + detachDir.toString());
        }
      }
      this.usage = new DF(parent, conf);
      this.dfsUsage = new DU(parent, conf);
      this.dfsUsage.start();
    }

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    FSVolume(File currentDir, Configuration conf) throws IOException {
      this.reserved = conf.getLong(DFSConfigKeys.DFS_DATANODE_DU_RESERVED_KEY,
                                   DFSConfigKeys.DFS_DATANODE_DU_RESERVED_DEFAULT);
      this.currentDir = currentDir; 
      File parent = currentDir.getParentFile();
      this.usage = new DF(parent, conf);
    }

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  private long getFreeSpace() throws IOException {
    long biggestSeenSoFar = 0;
    String[] localDirs = localStorage.getDirs();
    for (int i = 0; i < localDirs.length; i++) {
      DF df = null;
      if (localDirsDf.containsKey(localDirs[i])) {
        df = localDirsDf.get(localDirs[i]);
      } else {
        df = new DF(new File(localDirs[i]), fConf);
        localDirsDf.put(localDirs[i], df);
      }


      long availOnThisVol = df.getAvailable();
      if (availOnThisVol > biggestSeenSoFar) {
        biggestSeenSoFar = availOnThisVol;
      }
    }

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    if (minSpace == 0) {
      return true;
    }
    String[] localDirs = fConf.getLocalDirs();
    for (int i = 0; i < localDirs.length; i++) {
      DF df = null;
      if (localDirsDf.containsKey(localDirs[i])) {
        df = localDirsDf.get(localDirs[i]);
      } else {
        df = new DF(new File(localDirs[i]), fConf);
        localDirsDf.put(localDirs[i], df);
      }


      if (df.getAvailable() > minSpace)
        return true;
    }


    return false;
  }

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    if (minSpace == 0) {
      return true;
    }
    String[] localDirs = fConf.getLocalDirs();
    for (int i = 0; i < localDirs.length; i++) {
      DF df = null;
      if (localDirsDf.containsKey(localDirs[i])) {
        df = localDirsDf.get(localDirs[i]);
      } else {
        df = new DF(new File(localDirs[i]), fConf);
        localDirsDf.put(localDirs[i], df);
      }


      if (df.getAvailable() > minSpace)
        return true;
    }


    return false;
  }

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        assertTrue(configCapacity == (used + remaining + nonDFSUsed));
        assertTrue(percentUsed == ((100.0f * (float)used)/(float)configCapacity));
        assertTrue(percentRemaining == ((100.0f * (float)remaining)/(float)configCapacity));
      }   
      
      DF df = new DF(new File(cluster.getDataDirectory()), conf);
     
      //
      // Currently two data directories are created by the data node
      // in the MiniDFSCluster. This results in each data directory having
      // capacity equals to the disk capacity of the data directory.
      // Hence the capacity reported by the data node is twice the disk space
      // the disk capacity
      //
      // So multiply the disk capacity and reserved space by two 
      // for accommodating it
      //
      int numOfDataDirs = 2;
      
      long diskCapacity = numOfDataDirs * df.getCapacity();
      reserved *= numOfDataDirs;
      
      configCapacity = namesystem.getCapacityTotal();
      used = namesystem.getCapacityUsed();
      nonDFSUsed = namesystem.getCapacityUsedNonDFS();

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  private long getFreeSpace() throws IOException {
    long biggestSeenSoFar = 0;
    String[] localDirs = fConf.getLocalDirs();
    for (int i = 0; i < localDirs.length; i++) {
      DF df = null;
      if (localDirsDf.containsKey(localDirs[i])) {
        df = localDirsDf.get(localDirs[i]);
      } else {
        df = new DF(new File(localDirs[i]), fConf);
        localDirsDf.put(localDirs[i], df);
      }


      long availOnThisVol = df.getAvailable();
      if (availOnThisVol > biggestSeenSoFar) {
        biggestSeenSoFar = availOnThisVol;
      }
    }

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      if (!tmpDir.mkdirs()) {
        if (!tmpDir.isDirectory()) {
          throw new IOException("Mkdirs failed to create " + tmpDir.toString());
        }
      }
      this.usage = new DF(parent, conf);
      this.dfsUsage = new DU(parent, conf);
      this.dfsUsage.start();
    }

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    FSVolume(File currentDir, Configuration conf) throws IOException {
      this.reserved = conf.getLong(DFSConfigKeys.DFS_DATANODE_DU_RESERVED_KEY,
                                   DFSConfigKeys.DFS_DATANODE_DU_RESERVED_DEFAULT);
      this.currentDir = currentDir; 
      File parent = currentDir.getParentFile();
      this.usage = new DF(parent, conf);
    }

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    private boolean required;
    private String volume;
    
    public CheckedVolume(File dirToCheck, boolean required)
        throws IOException {
      df = new DF(dirToCheck, conf);
      this.required = required;
      volume = df.getFilesystem();
    }

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