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From a.@apache.org
Subject [04/21] hadoop git commit: HADOOP-12211. Collect disk usage on the node. Contributed by Robert Grandl
Date Thu, 16 Jul 2015 17:36:49 GMT
HADOOP-12211. Collect disk usage on the node. Contributed by Robert Grandl


Project: http://git-wip-us.apache.org/repos/asf/hadoop/repo
Commit: http://git-wip-us.apache.org/repos/asf/hadoop/commit/a431ed90
Tree: http://git-wip-us.apache.org/repos/asf/hadoop/tree/a431ed90
Diff: http://git-wip-us.apache.org/repos/asf/hadoop/diff/a431ed90

Branch: refs/heads/HADOOP-12111
Commit: a431ed9075cf6f467be5ff10f4ffb131cb1d3216
Parents: 9ef03a4
Author: Chris Douglas <cdouglas@apache.org>
Authored: Mon Jul 13 15:36:11 2015 -0700
Committer: Chris Douglas <cdouglas@apache.org>
Committed: Mon Jul 13 15:36:11 2015 -0700

----------------------------------------------------------------------
 hadoop-common-project/hadoop-common/CHANGES.txt |   2 +
 .../java/org/apache/hadoop/util/SysInfo.java    |  14 ++
 .../org/apache/hadoop/util/SysInfoLinux.java    | 157 ++++++++++++++++++-
 .../org/apache/hadoop/util/SysInfoWindows.java  |  12 ++
 .../apache/hadoop/util/TestSysInfoLinux.java    |  77 ++++++++-
 .../gridmix/DummyResourceCalculatorPlugin.java  |  17 ++
 .../yarn/util/ResourceCalculatorPlugin.java     |  18 +++
 7 files changed, 293 insertions(+), 4 deletions(-)
----------------------------------------------------------------------


http://git-wip-us.apache.org/repos/asf/hadoop/blob/a431ed90/hadoop-common-project/hadoop-common/CHANGES.txt
----------------------------------------------------------------------
diff --git a/hadoop-common-project/hadoop-common/CHANGES.txt b/hadoop-common-project/hadoop-common/CHANGES.txt
index 3d4f1e4..3121430 100644
--- a/hadoop-common-project/hadoop-common/CHANGES.txt
+++ b/hadoop-common-project/hadoop-common/CHANGES.txt
@@ -695,6 +695,8 @@ Release 2.8.0 - UNRELEASED
 
     HADOOP-12210. Collect network usage on the node (Robert Grandl via cdouglas)
 
+    HADOOP-12211. Collect disk usage on the node (Robert Grandl via cdouglas)
+
   OPTIMIZATIONS
 
     HADOOP-11785. Reduce the number of listStatus operation in distcp

http://git-wip-us.apache.org/repos/asf/hadoop/blob/a431ed90/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/util/SysInfo.java
----------------------------------------------------------------------
diff --git a/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/util/SysInfo.java
b/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/util/SysInfo.java
index 24b339d..b75a8d8 100644
--- a/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/util/SysInfo.java
+++ b/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/util/SysInfo.java
@@ -120,4 +120,18 @@ public abstract class SysInfo {
    */
   public abstract long getNetworkBytesWritten();
 
+  /**
+   * Obtain the aggregated number of bytes read from disks.
+   *
+   * @return total number of bytes read.
+   */
+  public abstract long getStorageBytesRead();
+
+  /**
+   * Obtain the aggregated number of bytes written to disks.
+   *
+   * @return total number of bytes written.
+   */
+  public abstract long getStorageBytesWritten();
+
 }

http://git-wip-us.apache.org/repos/asf/hadoop/blob/a431ed90/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/util/SysInfoLinux.java
----------------------------------------------------------------------
diff --git a/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/util/SysInfoLinux.java
b/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/util/SysInfoLinux.java
index 8801985..6b21f18 100644
--- a/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/util/SysInfoLinux.java
+++ b/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/util/SysInfoLinux.java
@@ -25,6 +25,7 @@ import java.io.InputStreamReader;
 import java.io.IOException;
 import java.math.BigInteger;
 import java.nio.charset.Charset;
+import java.util.HashMap;
 import java.util.HashSet;
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
@@ -94,11 +95,27 @@ public class SysInfoLinux extends SysInfo {
                "[ \t]*([0-9]+)[ \t]*([0-9]+)[ \t]*([0-9]+)[ \t]*([0-9]+)" +
                "[ \t]*([0-9]+)[ \t]*([0-9]+)[ \t]*([0-9]+)[ \t]*([0-9]+).*");
 
+  /**
+   * Pattern for parsing /proc/diskstats.
+   */
+  private static final String PROCFS_DISKSFILE = "/proc/diskstats";
+  private static final Pattern PROCFS_DISKSFILE_FORMAT =
+      Pattern.compile("^[ \t]*([0-9]+)[ \t]*([0-9 ]+)" +
+              "(?!([a-zA-Z]+[0-9]+))([a-zA-Z]+)" +
+              "[ \t]*([0-9]+)[ \t]*([0-9]+)[ \t]*([0-9]+)[ \t]*([0-9]+)" +
+              "[ \t]*([0-9]+)[ \t]*([0-9]+)[ \t]*([0-9]+)[ \t]*([0-9]+)" +
+              "[ \t]*([0-9]+)[ \t]*([0-9]+)[ \t]*([0-9]+)");
+  /**
+   * Pattern for parsing /sys/block/partition_name/queue/hw_sector_size.
+   */
+  private static final Pattern PROCFS_DISKSECTORFILE_FORMAT =
+      Pattern.compile("^([0-9]+)");
 
   private String procfsMemFile;
   private String procfsCpuFile;
   private String procfsStatFile;
   private String procfsNetFile;
+  private String procfsDisksFile;
   private long jiffyLengthInMillis;
 
   private long ramSize = 0;
@@ -113,10 +130,15 @@ public class SysInfoLinux extends SysInfo {
   private long cpuFrequency = 0L; // CPU frequency on the system (kHz)
   private long numNetBytesRead = 0L; // aggregated bytes read from network
   private long numNetBytesWritten = 0L; // aggregated bytes written to network
+  private long numDisksBytesRead = 0L; // aggregated bytes read from disks
+  private long numDisksBytesWritten = 0L; // aggregated bytes written to disks
 
   private boolean readMemInfoFile = false;
   private boolean readCpuInfoFile = false;
 
+  /* map for every disk its sector size */
+  private HashMap<String, Integer> perDiskSectorSize = null;
+
   public static final long PAGE_SIZE = getConf("PAGESIZE");
   public static final long JIFFY_LENGTH_IN_MILLIS =
       Math.max(Math.round(1000D / getConf("CLK_TCK")), -1);
@@ -145,7 +167,7 @@ public class SysInfoLinux extends SysInfo {
 
   public SysInfoLinux() {
     this(PROCFS_MEMFILE, PROCFS_CPUINFO, PROCFS_STAT,
-         PROCFS_NETFILE, JIFFY_LENGTH_IN_MILLIS);
+         PROCFS_NETFILE, PROCFS_DISKSFILE, JIFFY_LENGTH_IN_MILLIS);
   }
 
   /**
@@ -155,6 +177,7 @@ public class SysInfoLinux extends SysInfo {
    * @param procfsCpuFile fake file for /proc/cpuinfo
    * @param procfsStatFile fake file for /proc/stat
    * @param procfsNetFile fake file for /proc/net/dev
+   * @param procfsDisksFile fake file for /proc/diskstats
    * @param jiffyLengthInMillis fake jiffy length value
    */
   @VisibleForTesting
@@ -162,13 +185,16 @@ public class SysInfoLinux extends SysInfo {
                                        String procfsCpuFile,
                                        String procfsStatFile,
                                        String procfsNetFile,
+                                       String procfsDisksFile,
                                        long jiffyLengthInMillis) {
     this.procfsMemFile = procfsMemFile;
     this.procfsCpuFile = procfsCpuFile;
     this.procfsStatFile = procfsStatFile;
     this.procfsNetFile = procfsNetFile;
+    this.procfsDisksFile = procfsDisksFile;
     this.jiffyLengthInMillis = jiffyLengthInMillis;
     this.cpuTimeTracker = new CpuTimeTracker(jiffyLengthInMillis);
+    this.perDiskSectorSize = new HashMap<String, Integer>();
   }
 
   /**
@@ -411,6 +437,119 @@ public class SysInfoLinux extends SysInfo {
     }
   }
 
+  /**
+   * Read /proc/diskstats file, parse and calculate amount
+   * of bytes read and written from/to disks.
+   */
+  private void readProcDisksInfoFile() {
+
+    numDisksBytesRead = 0L;
+    numDisksBytesWritten = 0L;
+
+    // Read "/proc/diskstats" file
+    BufferedReader in;
+    try {
+      in = new BufferedReader(new InputStreamReader(
+            new FileInputStream(procfsDisksFile), Charset.forName("UTF-8")));
+    } catch (FileNotFoundException f) {
+      return;
+    }
+
+    Matcher mat;
+    try {
+      String str = in.readLine();
+      while (str != null) {
+        mat = PROCFS_DISKSFILE_FORMAT.matcher(str);
+        if (mat.find()) {
+          String diskName = mat.group(4);
+          assert diskName != null;
+          // ignore loop or ram partitions
+          if (diskName.contains("loop") || diskName.contains("ram")) {
+            str = in.readLine();
+            continue;
+          }
+
+          Integer sectorSize;
+          synchronized (perDiskSectorSize) {
+            sectorSize = perDiskSectorSize.get(diskName);
+            if (null == sectorSize) {
+              // retrieve sectorSize
+              // if unavailable or error, assume 512
+              sectorSize = readDiskBlockInformation(diskName, 512);
+              perDiskSectorSize.put(diskName, sectorSize);
+            }
+          }
+
+          String sectorsRead = mat.group(7);
+          String sectorsWritten = mat.group(11);
+          if (null == sectorsRead || null == sectorsWritten) {
+            return;
+          }
+          numDisksBytesRead += Long.parseLong(sectorsRead) * sectorSize;
+          numDisksBytesWritten += Long.parseLong(sectorsWritten) * sectorSize;
+        }
+        str = in.readLine();
+      }
+    } catch (IOException e) {
+      LOG.warn("Error reading the stream " + procfsDisksFile, e);
+    } finally {
+      // Close the streams
+      try {
+        in.close();
+      } catch (IOException e) {
+        LOG.warn("Error closing the stream " + procfsDisksFile, e);
+      }
+    }
+  }
+
+  /**
+   * Read /sys/block/diskName/queue/hw_sector_size file, parse and calculate
+   * sector size for a specific disk.
+   * @return sector size of specified disk, or defSector
+   */
+  int readDiskBlockInformation(String diskName, int defSector) {
+
+    assert perDiskSectorSize != null && diskName != null;
+
+    String procfsDiskSectorFile =
+            "/sys/block/" + diskName + "/queue/hw_sector_size";
+
+    BufferedReader in;
+    try {
+      in = new BufferedReader(new InputStreamReader(
+            new FileInputStream(procfsDiskSectorFile),
+              Charset.forName("UTF-8")));
+    } catch (FileNotFoundException f) {
+      return defSector;
+    }
+
+    Matcher mat;
+    try {
+      String str = in.readLine();
+      while (str != null) {
+        mat = PROCFS_DISKSECTORFILE_FORMAT.matcher(str);
+        if (mat.find()) {
+          String secSize = mat.group(1);
+          if (secSize != null) {
+            return Integer.parseInt(secSize);
+          }
+        }
+        str = in.readLine();
+      }
+      return defSector;
+    } catch (IOException|NumberFormatException e) {
+      LOG.warn("Error reading the stream " + procfsDiskSectorFile, e);
+      return defSector;
+    } finally {
+      // Close the streams
+      try {
+        in.close();
+      } catch (IOException e) {
+        LOG.warn("Error closing the stream " + procfsDiskSectorFile, e);
+      }
+    }
+  }
+
   /** {@inheritDoc} */
   @Override
   public long getPhysicalMemorySize() {
@@ -492,6 +631,18 @@ public class SysInfoLinux extends SysInfo {
     return numNetBytesWritten;
   }
 
+  @Override
+  public long getStorageBytesRead() {
+    readProcDisksInfoFile();
+    return numDisksBytesRead;
+  }
+
+  @Override
+  public long getStorageBytesWritten() {
+    readProcDisksInfoFile();
+    return numDisksBytesWritten;
+  }
+
   /**
    * Test the {@link SysInfoLinux}.
    *
@@ -515,6 +666,10 @@ public class SysInfoLinux extends SysInfo {
             + plugin.getNetworkBytesRead());
     System.out.println("Total network written (bytes) : "
             + plugin.getNetworkBytesWritten());
+    System.out.println("Total storage read (bytes) : "
+            + plugin.getStorageBytesRead());
+    System.out.println("Total storage written (bytes) : "
+            + plugin.getStorageBytesWritten());
     try {
       // Sleep so we can compute the CPU usage
       Thread.sleep(500L);

http://git-wip-us.apache.org/repos/asf/hadoop/blob/a431ed90/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/util/SysInfoWindows.java
----------------------------------------------------------------------
diff --git a/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/util/SysInfoWindows.java
b/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/util/SysInfoWindows.java
index f8542a3..f3fb364 100644
--- a/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/util/SysInfoWindows.java
+++ b/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/util/SysInfoWindows.java
@@ -193,4 +193,16 @@ public class SysInfoWindows extends SysInfo {
     return 0L;
   }
 
+  @Override
+  public long getStorageBytesRead() {
+    // TODO unimplemented
+    return 0L;
+  }
+
+  @Override
+  public long getStorageBytesWritten() {
+    // TODO unimplemented
+    return 0L;
+  }
+
 }

http://git-wip-us.apache.org/repos/asf/hadoop/blob/a431ed90/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/util/TestSysInfoLinux.java
----------------------------------------------------------------------
diff --git a/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/util/TestSysInfoLinux.java
b/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/util/TestSysInfoLinux.java
index 2a31f31..83f2e86 100644
--- a/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/util/TestSysInfoLinux.java
+++ b/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/util/TestSysInfoLinux.java
@@ -37,17 +37,18 @@ public class TestSysInfoLinux {
   /**
    * LinuxResourceCalculatorPlugin with a fake timer
    */
-  static class FakeLinuxResourceCalculatorPlugin extends
-      SysInfoLinux {
+  static class FakeLinuxResourceCalculatorPlugin extends SysInfoLinux {
+    static final int SECTORSIZE = 4096;
 
     long currentTime = 0;
     public FakeLinuxResourceCalculatorPlugin(String procfsMemFile,
                                              String procfsCpuFile,
                                              String procfsStatFile,
 			                                       String procfsNetFile,
+                                             String procfsDisksFile,
                                              long jiffyLengthInMillis) {
       super(procfsMemFile, procfsCpuFile, procfsStatFile, procfsNetFile,
-          jiffyLengthInMillis);
+          procfsDisksFile, jiffyLengthInMillis);
     }
     @Override
     long getCurrentTime() {
@@ -56,6 +57,10 @@ public class TestSysInfoLinux {
     public void advanceTime(long adv) {
       currentTime += adv * this.getJiffyLengthInMillis();
     }
+    @Override
+    int readDiskBlockInformation(String diskName, int defSector) {
+      return SECTORSIZE;
+    }
   }
   private static final FakeLinuxResourceCalculatorPlugin plugin;
   private static String TEST_ROOT_DIR = new Path(System.getProperty(
@@ -64,6 +69,7 @@ public class TestSysInfoLinux {
   private static final String FAKE_CPUFILE;
   private static final String FAKE_STATFILE;
   private static final String FAKE_NETFILE;
+  private static final String FAKE_DISKSFILE;
   private static final long FAKE_JIFFY_LENGTH = 10L;
   static {
     int randomNum = (new Random()).nextInt(1000000000);
@@ -71,9 +77,11 @@ public class TestSysInfoLinux {
     FAKE_CPUFILE = TEST_ROOT_DIR + File.separator + "CPUINFO_" + randomNum;
     FAKE_STATFILE = TEST_ROOT_DIR + File.separator + "STATINFO_" + randomNum;
     FAKE_NETFILE = TEST_ROOT_DIR + File.separator + "NETINFO_" + randomNum;
+    FAKE_DISKSFILE = TEST_ROOT_DIR + File.separator + "DISKSINFO_" + randomNum;
     plugin = new FakeLinuxResourceCalculatorPlugin(FAKE_MEMFILE, FAKE_CPUFILE,
                                                    FAKE_STATFILE,
                                                    FAKE_NETFILE,
+                                                   FAKE_DISKSFILE,
                                                    FAKE_JIFFY_LENGTH);
   }
   static final String MEMINFO_FORMAT =
@@ -157,6 +165,38 @@ public class TestSysInfoLinux {
     " eth1: %d 3152521    0    0    0     0          0    219781 %d 1866290    0    0   
" +
     "0     0       0          0\n";
 
+  static final String DISKSINFO_FORMAT =
+      "1       0 ram0 0 0 0 0 0 0 0 0 0 0 0\n"+
+      "1       1 ram1 0 0 0 0 0 0 0 0 0 0 0\n"+
+      "1       2 ram2 0 0 0 0 0 0 0 0 0 0 0\n"+
+      "1       3 ram3 0 0 0 0 0 0 0 0 0 0 0\n"+
+      "1       4 ram4 0 0 0 0 0 0 0 0 0 0 0\n"+
+      "1       5 ram5 0 0 0 0 0 0 0 0 0 0 0\n"+
+      "1       6 ram6 0 0 0 0 0 0 0 0 0 0 0\n"+
+      "7       0 loop0 0 0 0 0 0 0 0 0 0 0 0\n"+
+      "7       1 loop1 0 0 0 0 0 0 0 0 0 0 0\n"+
+      "8       0 sda 82575678 2486518 %d 59876600 3225402 19761924 %d " +
+      "6407705 4 48803346 66227952\n"+
+      "8       1 sda1 732 289 21354 787 7 3 32 4 0 769 791"+
+      "8       2 sda2 744272 2206315 23605200 6742762 336830 2979630 " +
+      "26539520 1424776 4 1820130 8165444\n"+
+      "8       3 sda3 81830497 279914 17881852954 53132969 2888558 16782291 " +
+      "157367552 4982925 0 47077660 58061635\n"+
+      "8      32 sdc 10148118 693255 %d 122125461 6090515 401630172 %d 2696685590 " +
+      "0 26848216 2818793840\n"+
+      "8      33 sdc1 10147917 693230 2054138426 122125426 6090506 401630172 " +
+      "3261765880 2696685589 0 26848181 2818793804\n"+
+      "8      64 sde 9989771 553047 %d 93407551 5978572 391997273 %d 2388274325 " +
+      "0 24396646 2481664818\n"+
+      "8      65 sde1 9989570 553022 1943973346 93407489 5978563 391997273 3183807264 " +
+      "2388274325 0 24396584 2481666274\n"+
+      "8      80 sdf 10197163 693995 %d 144374395 6216644 408395438 %d 2669389056 0 " +
+      "26164759 2813746348\n"+
+      "8      81 sdf1 10196962 693970 2033452794 144374355 6216635 408395438 3316897064 "
+
+      "2669389056 0 26164719 2813746308\n"+
+      "8     129 sdi1 10078602 657936 2056552626 108362198 6134036 403851153 3279882064 "
+
+      "2639256086 0 26260432 2747601085\n";
+
   /**
    * Test parsing /proc/stat and /proc/cpuinfo
    * @throws IOException
@@ -358,4 +398,35 @@ public class TestSysInfoLinux {
     assertEquals(plugin.getNetworkBytesWritten(), numBytesWrittenIntf1 + numBytesWrittenIntf2);
   }
 
+  /**
+   * Test parsing /proc/diskstats
+   * @throws IOException
+   */
+  @Test
+  public void parsingProcDisksFile() throws IOException {
+    long numSectorsReadsda = 1790549L; long numSectorsWrittensda = 1839071L;
+    long numSectorsReadsdc = 20541402L; long numSectorsWrittensdc = 32617658L;
+    long numSectorsReadsde = 19439751L; long numSectorsWrittensde = 31838072L;
+    long numSectorsReadsdf = 20334546L; long numSectorsWrittensdf = 33168970L;
+    File tempFile = new File(FAKE_DISKSFILE);
+    tempFile.deleteOnExit();
+    FileWriter fWriter = new FileWriter(FAKE_DISKSFILE);
+    fWriter.write(String.format(DISKSINFO_FORMAT,
+             numSectorsReadsda, numSectorsWrittensda,
+             numSectorsReadsdc, numSectorsWrittensdc,
+             numSectorsReadsde, numSectorsWrittensde,
+             numSectorsReadsdf, numSectorsWrittensdf));
+
+    fWriter.close();
+    long expectedNumSectorsRead = numSectorsReadsda + numSectorsReadsdc +
+                                  numSectorsReadsde + numSectorsReadsdf;
+    long expectedNumSectorsWritten = numSectorsWrittensda + numSectorsWrittensdc +
+                                     numSectorsWrittensde + numSectorsWrittensdf;
+    // use non-default sector size
+    int diskSectorSize = FakeLinuxResourceCalculatorPlugin.SECTORSIZE;
+    assertEquals(expectedNumSectorsRead * diskSectorSize,
+        plugin.getStorageBytesRead());
+    assertEquals(expectedNumSectorsWritten * diskSectorSize,
+        plugin.getStorageBytesWritten());
+  }
 }

http://git-wip-us.apache.org/repos/asf/hadoop/blob/a431ed90/hadoop-tools/hadoop-gridmix/src/test/java/org/apache/hadoop/mapred/gridmix/DummyResourceCalculatorPlugin.java
----------------------------------------------------------------------
diff --git a/hadoop-tools/hadoop-gridmix/src/test/java/org/apache/hadoop/mapred/gridmix/DummyResourceCalculatorPlugin.java
b/hadoop-tools/hadoop-gridmix/src/test/java/org/apache/hadoop/mapred/gridmix/DummyResourceCalculatorPlugin.java
index b86303b..4999f14 100644
--- a/hadoop-tools/hadoop-gridmix/src/test/java/org/apache/hadoop/mapred/gridmix/DummyResourceCalculatorPlugin.java
+++ b/hadoop-tools/hadoop-gridmix/src/test/java/org/apache/hadoop/mapred/gridmix/DummyResourceCalculatorPlugin.java
@@ -54,6 +54,12 @@ public class DummyResourceCalculatorPlugin extends ResourceCalculatorPlugin
{
   /** cumulative number of bytes written over the network */
   public static final String NETWORK_BYTES_WRITTEN =
       "mapred.tasktracker.networkwritten.testing";
+  /** cumulative number of bytes read from disks */
+  public static final String STORAGE_BYTES_READ =
+      "mapred.tasktracker.storageread.testing";
+  /** cumulative number of bytes written to disks */
+  public static final String STORAGE_BYTES_WRITTEN =
+      "mapred.tasktracker.storagewritten.testing";
   /** process cumulative CPU usage time for testing */
   public static final String PROC_CUMULATIVE_CPU_TIME =
       "mapred.tasktracker.proccumulativecputime.testing";
@@ -130,4 +136,15 @@ public class DummyResourceCalculatorPlugin extends ResourceCalculatorPlugin
{
     return getConf().getLong(NETWORK_BYTES_WRITTEN, -1);
   }
 
+  /** {@inheritDoc} */
+  @Override
+  public long getStorageBytesRead() {
+    return getConf().getLong(STORAGE_BYTES_READ, -1);
+  }
+
+  /** {@inheritDoc} */
+  @Override
+  public long getStorageBytesWritten() {
+    return getConf().getLong(STORAGE_BYTES_WRITTEN, -1);
+  }
 }

http://git-wip-us.apache.org/repos/asf/hadoop/blob/a431ed90/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-common/src/main/java/org/apache/hadoop/yarn/util/ResourceCalculatorPlugin.java
----------------------------------------------------------------------
diff --git a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-common/src/main/java/org/apache/hadoop/yarn/util/ResourceCalculatorPlugin.java
b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-common/src/main/java/org/apache/hadoop/yarn/util/ResourceCalculatorPlugin.java
index 3af4aee..691c4ac 100644
--- a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-common/src/main/java/org/apache/hadoop/yarn/util/ResourceCalculatorPlugin.java
+++ b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-common/src/main/java/org/apache/hadoop/yarn/util/ResourceCalculatorPlugin.java
@@ -145,6 +145,24 @@ public class ResourceCalculatorPlugin extends Configured {
   }
 
   /**
+   * Obtain the aggregated number of bytes read from disks.
+   *
+   * @return total number of bytes read.
+   */
+  public long getStorageBytesRead() {
+    return sys.getStorageBytesRead();
+  }
+
+  /**
+   * Obtain the aggregated number of bytes written to disks.
+   *
+   * @return total number of bytes written.
+   */
+  public long getStorageBytesWritten() {
+    return sys.getStorageBytesWritten();
+  }
+
+  /**
    * Create the ResourceCalculatorPlugin from the class name and configure it. If
    * class name is null, this method will try and return a memory calculator
    * plugin available for this system.


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