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.

    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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            configCapacity));
        assertTrue(percentBpUsed == DFSUtil.getPercentUsed(bpUsed,
            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.getNonDfsUsedSpace();

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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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    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);
    this.storageType = storageType;
    final int maxNumThreads = dataset.datanode.getConf().getInt(
        DFSConfigKeys.DFS_DATANODE_FSDATASETCACHE_MAX_THREADS_PER_VOLUME_KEY,
        DFSConfigKeys.DFS_DATANODE_FSDATASETCACHE_MAX_THREADS_PER_VOLUME_DEFAULT
        );

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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 (!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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  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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    private DU dfsUsage;
    
    FSVolume(FSDataset dataset, File currentDir, Configuration conf) throws IOException {
      this.currentDir = currentDir; 
      File parent = currentDir.getParentFile();
      this.usage = new DF(parent, conf);
      this.reserved = usage.getReserved();
      this.dataset = dataset;
      this.namespaceMap = new NamespaceMap();
      this.dfsUsage = new DU(currentDir, conf);
      this.dfsUsage.start();

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   */
  long getDiskSpace(boolean free) 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 onThisVol = free ? df.getAvailable() : df.getCapacity();
      if (onThisVol > biggestSeenSoFar) {
        biggestSeenSoFar = onThisVol;
      }
    }

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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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org.apache.hadoop.fs.LocalFileSystem

org.apache.hadoop.hdfs.server.datanode.FSDataset$FSVolume

org.apache.hadoop.hdfs.server.datanode.fsdataset.impl.FsVolumeImpl

org.apache.hadoop.hdfs.server.namenode.NameNodeResourceChecker

org.apache.hadoop.hdfs.server.namenode.NameNodeResourceChecker$CheckedVolume

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org.apache.hadoop.hdfs.server.namenode.TestNameNodeResourceChecker

org.apache.hadoop.mapred.TaskTracker

java.io.FileNotFoundException

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