diff --git a/hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/protocol/DatanodeInfo.java b/hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/protocol/DatanodeInfo.java
index cd32a5350a3..e9ee8b905a2 100644
--- a/hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/protocol/DatanodeInfo.java
+++ b/hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/protocol/DatanodeInfo.java
@@ -43,6 +43,7 @@ import static org.apache.hadoop.hdfs.DFSUtilClient.percent2String;
 public class DatanodeInfo extends DatanodeID implements Node {
   private long capacity;
   private long dfsUsed;
+  private long nonDfsUsed;
   private long remaining;
   private long blockPoolUsed;
   private long cacheCapacity;
@@ -89,6 +90,7 @@ public class DatanodeInfo extends DatanodeID implements Node {
     super(from);
     this.capacity = from.getCapacity();
     this.dfsUsed = from.getDfsUsed();
+    this.nonDfsUsed = from.getNonDfsUsed();
     this.remaining = from.getRemaining();
     this.blockPoolUsed = from.getBlockPoolUsed();
     this.cacheCapacity = from.getCacheCapacity();
@@ -105,6 +107,7 @@ public class DatanodeInfo extends DatanodeID implements Node {
     super(nodeID);
     this.capacity = 0L;
     this.dfsUsed = 0L;
+    this.nonDfsUsed = 0L;
     this.remaining = 0L;
     this.blockPoolUsed = 0L;
     this.cacheCapacity = 0L;
@@ -158,10 +161,26 @@ public class DatanodeInfo extends DatanodeID implements Node {
       final int xceiverCount, final String networkLocation,
       final AdminStates adminState,
       final String upgradeDomain) {
-    super(ipAddr, hostName, datanodeUuid, xferPort, infoPort,
-            infoSecurePort, ipcPort);
+    this(ipAddr, hostName, datanodeUuid, xferPort, infoPort, infoSecurePort,
+        ipcPort, capacity, dfsUsed, 0L, remaining, blockPoolUsed,
+        cacheCapacity, cacheUsed, lastUpdate, lastUpdateMonotonic,
+        xceiverCount, networkLocation, adminState, upgradeDomain);
+  }
+
+  /** Constructor. */
+  public DatanodeInfo(final String ipAddr, final String hostName,
+      final String datanodeUuid, final int xferPort, final int infoPort,
+      final int infoSecurePort, final int ipcPort, final long capacity,
+      final long dfsUsed, final long nonDfsUsed, final long remaining,
+      final long blockPoolUsed, final long cacheCapacity, final long cacheUsed,
+      final long lastUpdate, final long lastUpdateMonotonic,
+      final int xceiverCount, final String networkLocation,
+      final AdminStates adminState, final String upgradeDomain) {
+    super(ipAddr, hostName, datanodeUuid, xferPort, infoPort, infoSecurePort,
+        ipcPort);
     this.capacity = capacity;
     this.dfsUsed = dfsUsed;
+    this.nonDfsUsed = nonDfsUsed;
     this.remaining = remaining;
     this.blockPoolUsed = blockPoolUsed;
     this.cacheCapacity = cacheCapacity;
@@ -174,7 +193,7 @@ public class DatanodeInfo extends DatanodeID implements Node {
     this.upgradeDomain = upgradeDomain;
   }
 
-  /** Network location name */
+  /** Network location name. */
   @Override
   public String getName() {
     return getXferAddr();
@@ -191,8 +210,7 @@ public class DatanodeInfo extends DatanodeID implements Node {
 
   /** The used space by the data node. */
   public long getNonDfsUsed() {
-    long nonDFSUsed = capacity - dfsUsed - remaining;
-    return nonDFSUsed < 0 ? 0 : nonDFSUsed;
+    return nonDfsUsed;
   }
 
   /** The used space by the data node as percentage of present capacity */
@@ -282,6 +300,11 @@ public class DatanodeInfo extends DatanodeID implements Node {
     this.dfsUsed = dfsUsed;
   }
 
+  /** Sets the nondfs-used space for the datanode. */
+  public void setNonDfsUsed(long nonDfsUsed) {
+    this.nonDfsUsed = nonDfsUsed;
+  }
+
   /** Sets raw free space. */
   public void setRemaining(long remaining) {
     this.remaining = remaining;
diff --git a/hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/protocolPB/PBHelperClient.java b/hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/protocolPB/PBHelperClient.java
index 7df68e743a2..246b5a5a7a6 100644
--- a/hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/protocolPB/PBHelperClient.java
+++ b/hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/protocolPB/PBHelperClient.java
@@ -289,6 +289,7 @@ public class PBHelperClient {
         .setId(convert((DatanodeID) info))
         .setCapacity(info.getCapacity())
         .setDfsUsed(info.getDfsUsed())
+        .setNonDfsUsed(info.getNonDfsUsed())
         .setRemaining(info.getRemaining())
         .setBlockPoolUsed(info.getBlockPoolUsed())
         .setCacheCapacity(info.getCacheCapacity())
@@ -581,15 +582,24 @@ public class PBHelperClient {
   }
 
   static public DatanodeInfo convert(DatanodeInfoProto di) {
-    if (di == null) return null;
-    return new DatanodeInfo(
-        convert(di.getId()),
-        di.hasLocation() ? di.getLocation() : null,
-        di.getCapacity(),  di.getDfsUsed(),  di.getRemaining(),
-        di.getBlockPoolUsed(), di.getCacheCapacity(), di.getCacheUsed(),
-        di.getLastUpdate(), di.getLastUpdateMonotonic(),
-        di.getXceiverCount(), convert(di.getAdminState()),
+    if (di == null) {
+      return null;
+    }
+    DatanodeInfo dinfo = new DatanodeInfo(convert(di.getId()),
+        di.hasLocation() ? di.getLocation() : null, di.getCapacity(),
+        di.getDfsUsed(), di.getRemaining(), di.getBlockPoolUsed(),
+        di.getCacheCapacity(), di.getCacheUsed(), di.getLastUpdate(),
+        di.getLastUpdateMonotonic(), di.getXceiverCount(),
+        convert(di.getAdminState()),
         di.hasUpgradeDomain() ? di.getUpgradeDomain() : null);
+    if (di.hasNonDfsUsed()) {
+      dinfo.setNonDfsUsed(di.getNonDfsUsed());
+    } else {
+      // use the legacy way for older datanodes
+      long nonDFSUsed = di.getCapacity() - di.getDfsUsed() - di.getRemaining();
+      dinfo.setNonDfsUsed(nonDFSUsed < 0 ? 0 : nonDFSUsed);
+    }
+    return dinfo;
   }
 
   public static StorageType[] convertStorageTypes(
@@ -1556,12 +1566,12 @@ public class PBHelperClient {
   }
 
   public static StorageReport convert(StorageReportProto p) {
-    return new StorageReport(
-        p.hasStorage() ?
-            convert(p.getStorage()) :
-            new DatanodeStorage(p.getStorageUuid()),
-        p.getFailed(), p.getCapacity(), p.getDfsUsed(), p.getRemaining(),
-        p.getBlockPoolUsed());
+    long nonDfsUsed = p.hasNonDfsUsed() ? p.getNonDfsUsed() : p.getCapacity()
+        - p.getDfsUsed() - p.getRemaining();
+    return new StorageReport(p.hasStorage() ? convert(p.getStorage())
+        : new DatanodeStorage(p.getStorageUuid()), p.getFailed(),
+        p.getCapacity(), p.getDfsUsed(), p.getRemaining(),
+        p.getBlockPoolUsed(), nonDfsUsed);
   }
 
   public static DatanodeStorage convert(DatanodeStorageProto s) {
@@ -2136,7 +2146,8 @@ public class PBHelperClient {
         .setBlockPoolUsed(r.getBlockPoolUsed()).setCapacity(r.getCapacity())
         .setDfsUsed(r.getDfsUsed()).setRemaining(r.getRemaining())
         .setStorageUuid(r.getStorage().getStorageID())
-        .setStorage(convert(r.getStorage()));
+        .setStorage(convert(r.getStorage()))
+        .setNonDfsUsed(r.getNonDfsUsed());
     return builder.build();
   }
 
diff --git a/hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/server/protocol/StorageReport.java b/hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/server/protocol/StorageReport.java
index 3fbc424fa0d..7042b58a2f4 100644
--- a/hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/server/protocol/StorageReport.java
+++ b/hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/server/protocol/StorageReport.java
@@ -25,17 +25,19 @@ public class StorageReport {
   private final boolean failed;
   private final long capacity;
   private final long dfsUsed;
+  private final long nonDfsUsed;
   private final long remaining;
   private final long blockPoolUsed;
 
   public static final StorageReport[] EMPTY_ARRAY = {};
 
-  public StorageReport(DatanodeStorage storage, boolean failed,
-      long capacity, long dfsUsed, long remaining, long bpUsed) {
+  public StorageReport(DatanodeStorage storage, boolean failed, long capacity,
+      long dfsUsed, long remaining, long bpUsed, long nonDfsUsed) {
     this.storage = storage;
     this.failed = failed;
     this.capacity = capacity;
     this.dfsUsed = dfsUsed;
+    this.nonDfsUsed = nonDfsUsed;
     this.remaining = remaining;
     this.blockPoolUsed = bpUsed;
   }
@@ -56,6 +58,10 @@ public class StorageReport {
     return dfsUsed;
   }
 
+  public long getNonDfsUsed() {
+    return nonDfsUsed;
+  }
+
   public long getRemaining() {
     return remaining;
   }
diff --git a/hadoop-hdfs-project/hadoop-hdfs-client/src/main/proto/hdfs.proto b/hadoop-hdfs-project/hadoop-hdfs-client/src/main/proto/hdfs.proto
index 7de8550d59b..1141fcf62ee 100644
--- a/hadoop-hdfs-project/hadoop-hdfs-client/src/main/proto/hdfs.proto
+++ b/hadoop-hdfs-project/hadoop-hdfs-client/src/main/proto/hdfs.proto
@@ -101,6 +101,7 @@ message DatanodeInfoProto {
   optional uint64 cacheUsed = 12 [default = 0];
   optional uint64 lastUpdateMonotonic = 13 [default = 0];
   optional string upgradeDomain = 14;
+  optional uint64 nonDfsUsed = 15;
 }
 
 /**
@@ -125,6 +126,7 @@ message StorageReportProto {
   optional uint64 remaining = 5 [ default = 0 ];
   optional uint64 blockPoolUsed = 6 [ default = 0 ];
   optional DatanodeStorageProto storage = 7; // supersedes StorageUuid
+  optional uint64 nonDfsUsed = 8;
 }
 
 /**
diff --git a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/DatanodeDescriptor.java b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/DatanodeDescriptor.java
index 1646129680c..c74d7c553fd 100644
--- a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/DatanodeDescriptor.java
+++ b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/DatanodeDescriptor.java
@@ -417,6 +417,7 @@ public class DatanodeDescriptor extends DatanodeInfo {
     long totalRemaining = 0;
     long totalBlockPoolUsed = 0;
     long totalDfsUsed = 0;
+    long totalNonDfsUsed = 0;
     Set<DatanodeStorageInfo> failedStorageInfos = null;
 
     // Decide if we should check for any missing StorageReport and mark it as
@@ -477,6 +478,7 @@ public class DatanodeDescriptor extends DatanodeInfo {
       totalRemaining += report.getRemaining();
       totalBlockPoolUsed += report.getBlockPoolUsed();
       totalDfsUsed += report.getDfsUsed();
+      totalNonDfsUsed += report.getNonDfsUsed();
     }
     rollBlocksScheduled(getLastUpdateMonotonic());
 
@@ -485,6 +487,7 @@ public class DatanodeDescriptor extends DatanodeInfo {
     setRemaining(totalRemaining);
     setBlockPoolUsed(totalBlockPoolUsed);
     setDfsUsed(totalDfsUsed);
+    setNonDfsUsed(totalNonDfsUsed);
     if (checkFailedStorages) {
       updateFailedStorage(failedStorageInfos);
     }
diff --git a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/DatanodeStats.java b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/DatanodeStats.java
index 0d4e235d803..8386b279fed 100644
--- a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/DatanodeStats.java
+++ b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/DatanodeStats.java
@@ -35,6 +35,7 @@ class DatanodeStats {
   private final StorageTypeStatsMap statsMap = new StorageTypeStatsMap();
   private long capacityTotal = 0L;
   private long capacityUsed = 0L;
+  private long capacityUsedNonDfs = 0L;
   private long capacityRemaining = 0L;
   private long blockPoolUsed = 0L;
   private int xceiverCount = 0;
@@ -49,6 +50,7 @@ class DatanodeStats {
     xceiverCount += node.getXceiverCount();
     if (node.isInService()) {
       capacityUsed += node.getDfsUsed();
+      capacityUsedNonDfs += node.getNonDfsUsed();
       blockPoolUsed += node.getBlockPoolUsed();
       nodesInService++;
       nodesInServiceXceiverCount += node.getXceiverCount();
@@ -77,6 +79,7 @@ class DatanodeStats {
     xceiverCount -= node.getXceiverCount();
     if (node.isInService()) {
       capacityUsed -= node.getDfsUsed();
+      capacityUsedNonDfs -= node.getNonDfsUsed();
       blockPoolUsed -= node.getBlockPoolUsed();
       nodesInService--;
       nodesInServiceXceiverCount -= node.getXceiverCount();
@@ -159,8 +162,7 @@ class DatanodeStats {
   }
 
   synchronized long getCapacityUsedNonDFS() {
-    final long nonDFSUsed = capacityTotal - capacityRemaining - capacityUsed;
-    return nonDFSUsed < 0L? 0L : nonDFSUsed;
+    return capacityUsedNonDfs;
   }
 
   synchronized float getCapacityUsedPercent() {
diff --git a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/DatanodeStorageInfo.java b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/DatanodeStorageInfo.java
index 843a8d514ba..d98a2c15cc2 100644
--- a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/DatanodeStorageInfo.java
+++ b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/DatanodeStorageInfo.java
@@ -93,6 +93,7 @@ public class DatanodeStorageInfo {
 
   private long capacity;
   private long dfsUsed;
+  private long nonDfsUsed;
   private volatile long remaining;
   private long blockPoolUsed;
 
@@ -202,6 +203,10 @@ public class DatanodeStorageInfo {
     return dfsUsed;
   }
 
+  long getNonDfsUsed() {
+    return nonDfsUsed;
+  }
+
   long getRemaining() {
     return remaining;
   }
@@ -283,6 +288,7 @@ public class DatanodeStorageInfo {
   void updateState(StorageReport r) {
     capacity = r.getCapacity();
     dfsUsed = r.getDfsUsed();
+    nonDfsUsed = r.getNonDfsUsed();
     remaining = r.getRemaining();
     blockPoolUsed = r.getBlockPoolUsed();
   }
@@ -332,7 +338,7 @@ public class DatanodeStorageInfo {
   StorageReport toStorageReport() {
     return new StorageReport(
         new DatanodeStorage(storageID, state, storageType),
-        false, capacity, dfsUsed, remaining, blockPoolUsed);
+        false, capacity, dfsUsed, remaining, blockPoolUsed, nonDfsUsed);
   }
 
   /**
diff --git a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/impl/FsDatasetImpl.java b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/impl/FsDatasetImpl.java
index e0d2baf8b68..ffd2f8ab34d 100644
--- a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/impl/FsDatasetImpl.java
+++ b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/impl/FsDatasetImpl.java
@@ -164,7 +164,8 @@ class FsDatasetImpl implements FsDatasetSpi<FsVolumeImpl> {
               volume.getCapacity(),
               volume.getDfsUsed(),
               volume.getAvailable(),
-              volume.getBlockPoolUsed(bpid));
+              volume.getBlockPoolUsed(bpid),
+              volume.getNonDfsUsed());
           reports.add(sr);
         } catch (ClosedChannelException e) {
           continue;
diff --git a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/impl/FsVolumeImpl.java b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/impl/FsVolumeImpl.java
index 59c9ed46334..afcc5dd4862 100644
--- a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/impl/FsVolumeImpl.java
+++ b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/impl/FsVolumeImpl.java
@@ -385,15 +385,46 @@ public class FsVolumeImpl implements FsVolumeSpi {
    */
   @Override
   public long getAvailable() throws IOException {
-    long remaining = getCapacity() - getDfsUsed() - reservedForReplicas.get();
-    long available = usage.getAvailable() - reserved
-        - reservedForReplicas.get();
+    long remaining = getCapacity() - getDfsUsed() - getReservedForReplicas();
+    long available = usage.getAvailable()  - getRemainingReserved()
+        - getReservedForReplicas();
     if (remaining > available) {
       remaining = available;
     }
     return (remaining > 0) ? remaining : 0;
   }
 
+  long getActualNonDfsUsed() throws IOException {
+    return usage.getUsed() - getDfsUsed();
+  }
+
+  private long getRemainingReserved() throws IOException {
+    long actualNonDfsUsed = getActualNonDfsUsed();
+    if (actualNonDfsUsed < reserved) {
+      return reserved - actualNonDfsUsed;
+    }
+    return 0L;
+  }
+
+  /**
+   * Unplanned Non-DFS usage, i.e. Extra usage beyond reserved.
+   *
+   * @return
+   * @throws IOException
+   */
+  public long getNonDfsUsed() throws IOException {
+    long actualNonDfsUsed = getActualNonDfsUsed();
+    if (actualNonDfsUsed < reserved) {
+      return 0L;
+    }
+    return actualNonDfsUsed - reserved;
+  }
+
+  @VisibleForTesting
+  long getDfAvailable() {
+    return usage.getAvailable();
+  }
+
   @VisibleForTesting
   public long getReservedForReplicas() {
     return reservedForReplicas.get();
diff --git a/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/protocolPB/TestPBHelper.java b/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/protocolPB/TestPBHelper.java
index 45cd4ea357d..af177565a08 100644
--- a/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/protocolPB/TestPBHelper.java
+++ b/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/protocolPB/TestPBHelper.java
@@ -720,6 +720,28 @@ public class TestPBHelper {
     assertBlockECRecoveryInfoEquals(blkECRecoveryInfo1, iterator.next());
   }
 
+  @Test
+  public void testDataNodeInfoPBHelper() {
+    DatanodeID id = DFSTestUtil.getLocalDatanodeID();
+    DatanodeInfo dnInfos0 = new DatanodeInfo(id);
+    dnInfos0.setCapacity(3500L);
+    dnInfos0.setDfsUsed(1000L);
+    dnInfos0.setNonDfsUsed(2000L);
+    dnInfos0.setRemaining(500L);
+    HdfsProtos.DatanodeInfoProto dnproto = PBHelperClient.convert(dnInfos0);
+    DatanodeInfo dnInfos1 = PBHelperClient.convert(dnproto);
+    compare(dnInfos0, dnInfos1);
+    assertEquals(dnInfos0.getNonDfsUsed(), dnInfos1.getNonDfsUsed());
+
+    //Testing without nonDfs field
+    HdfsProtos.DatanodeInfoProto.Builder b =
+        HdfsProtos.DatanodeInfoProto.newBuilder();
+    b.setId(PBHelperClient.convert(id)).setCapacity(3500L).setDfsUsed(1000L)
+        .setRemaining(500L);
+    DatanodeInfo dnInfos3 = PBHelperClient.convert(b.build());
+    assertEquals(dnInfos0.getNonDfsUsed(), dnInfos3.getNonDfsUsed());
+  }
+
   private void assertBlockECRecoveryInfoEquals(
       BlockECReconstructionInfo blkECRecoveryInfo1,
       BlockECReconstructionInfo blkECRecoveryInfo2) {
@@ -768,4 +790,6 @@ public class TestPBHelper {
       compare(dnInfos1[i], dnInfos2[i]);
     }
   }
+
+
 }
diff --git a/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/blockmanagement/BlockManagerTestUtil.java b/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/blockmanagement/BlockManagerTestUtil.java
index 1b565ee4cc8..5fb3b2500e9 100644
--- a/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/blockmanagement/BlockManagerTestUtil.java
+++ b/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/blockmanagement/BlockManagerTestUtil.java
@@ -294,7 +294,7 @@ public class BlockManagerTestUtil {
       StorageReport report = new StorageReport(
           dns ,false, storage.getCapacity(),
           storage.getDfsUsed(), storage.getRemaining(),
-          storage.getBlockPoolUsed());
+          storage.getBlockPoolUsed(), 0);
       reports.add(report);
     }
     return reports.toArray(StorageReport.EMPTY_ARRAY);
diff --git a/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/blockmanagement/TestBlockManager.java b/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/blockmanagement/TestBlockManager.java
index 1f58f99b8a2..942569a7dc2 100644
--- a/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/blockmanagement/TestBlockManager.java
+++ b/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/blockmanagement/TestBlockManager.java
@@ -1200,7 +1200,7 @@ public class TestBlockManager {
           StorageReport report = new StorageReport(
               dns, true, storageInfo.getCapacity(),
               storageInfo.getDfsUsed(), storageInfo.getRemaining(),
-              storageInfo.getBlockPoolUsed());
+              storageInfo.getBlockPoolUsed(), 0L);
           reports.add(report);
           break;
         }
diff --git a/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/datanode/SimulatedFSDataset.java b/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/datanode/SimulatedFSDataset.java
index c0c76ad7fc2..a082fbbb901 100644
--- a/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/datanode/SimulatedFSDataset.java
+++ b/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/datanode/SimulatedFSDataset.java
@@ -441,7 +441,7 @@ public class SimulatedFSDataset implements FsDatasetSpi<FsVolumeSpi> {
     synchronized StorageReport getStorageReport(String bpid) {
       return new StorageReport(dnStorage,
           false, getCapacity(), getUsed(), getFree(),
-          map.get(bpid).getUsed());
+          map.get(bpid).getUsed(), 0L);
     }
   }
   
diff --git a/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/datanode/extdataset/ExternalDatasetImpl.java b/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/datanode/extdataset/ExternalDatasetImpl.java
index b8564bb2c8e..fcd960a79ae 100644
--- a/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/datanode/extdataset/ExternalDatasetImpl.java
+++ b/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/datanode/extdataset/ExternalDatasetImpl.java
@@ -72,7 +72,7 @@ public class ExternalDatasetImpl implements FsDatasetSpi<ExternalVolumeImpl> {
   @Override
   public StorageReport[] getStorageReports(String bpid) throws IOException {
     StorageReport[] result = new StorageReport[1];
-    result[0] = new StorageReport(storage, false, 0, 0, 0, 0);
+    result[0] = new StorageReport(storage, false, 0, 0, 0, 0, 0);
     return result;
   }
 
diff --git a/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/impl/TestFsVolumeList.java b/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/impl/TestFsVolumeList.java
index 796d2490ac9..3d4c38cd938 100644
--- a/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/impl/TestFsVolumeList.java
+++ b/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/impl/TestFsVolumeList.java
@@ -30,6 +30,7 @@ import org.apache.hadoop.test.GenericTestUtils;
 import org.apache.hadoop.util.StringUtils;
 import org.junit.Before;
 import org.junit.Test;
+import org.mockito.Mockito;
 
 import java.io.File;
 import java.io.IOException;
@@ -177,4 +178,43 @@ public class TestFsVolumeList {
         conf, StorageType.DEFAULT);
     assertEquals("", 100L, volume4.getReserved());
   }
+
+  @Test
+  public void testNonDfsUsedMetricForVolume() throws Exception {
+    File volDir = new File(baseDir, "volume-0");
+    volDir.mkdirs();
+    /*
+     * Lets have the example.
+     * Capacity - 1000
+     * Reserved - 100
+     * DfsUsed  - 200
+     * Actual Non-DfsUsed - 300 -->(expected)
+     * ReservedForReplicas - 50
+     */
+    long diskCapacity = 1000L;
+    long duReserved = 100L;
+    long dfsUsage = 200L;
+    long actualNonDfsUsage = 300L;
+    long reservedForReplicas = 50L;
+    conf.setLong(DFSConfigKeys.DFS_DATANODE_DU_RESERVED_KEY, duReserved);
+    FsVolumeImpl volume = new FsVolumeImpl(dataset, "storage-id", volDir, conf,
+        StorageType.DEFAULT);
+    FsVolumeImpl spyVolume = Mockito.spy(volume);
+    // Set Capacity for testing
+    long testCapacity = diskCapacity - duReserved;
+    spyVolume.setCapacityForTesting(testCapacity);
+    // Mock volume.getDfAvailable()
+    long dfAvailable = diskCapacity - dfsUsage - actualNonDfsUsage;
+    Mockito.doReturn(dfAvailable).when(spyVolume).getDfAvailable();
+    // Mock dfsUsage
+    Mockito.doReturn(dfsUsage).when(spyVolume).getDfsUsed();
+    // Mock reservedForReplcas
+    Mockito.doReturn(reservedForReplicas).when(spyVolume)
+        .getReservedForReplicas();
+    Mockito.doReturn(actualNonDfsUsage).when(spyVolume)
+        .getActualNonDfsUsed();
+    long expectedNonDfsUsage =
+        actualNonDfsUsage - duReserved;
+    assertEquals(expectedNonDfsUsage, spyVolume.getNonDfsUsed());
+  }
 }
diff --git a/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/NNThroughputBenchmark.java b/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/NNThroughputBenchmark.java
index be2a6781dc9..ad336ef2552 100644
--- a/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/NNThroughputBenchmark.java
+++ b/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/NNThroughputBenchmark.java
@@ -949,7 +949,7 @@ public class NNThroughputBenchmark implements Tool {
       // register datanode
       // TODO:FEDERATION currently a single block pool is supported
       StorageReport[] rep = { new StorageReport(storage, false,
-          DF_CAPACITY, DF_USED, DF_CAPACITY - DF_USED, DF_USED) };
+          DF_CAPACITY, DF_USED, DF_CAPACITY - DF_USED, DF_USED, 0L) };
       DatanodeCommand[] cmds = dataNodeProto.sendHeartbeat(dnRegistration, rep,
           0L, 0L, 0, 0, 0, null, true).getCommands();
       if(cmds != null) {
@@ -998,7 +998,7 @@ public class NNThroughputBenchmark implements Tool {
     int replicateBlocks() throws IOException {
       // register datanode
       StorageReport[] rep = { new StorageReport(storage,
-          false, DF_CAPACITY, DF_USED, DF_CAPACITY - DF_USED, DF_USED) };
+          false, DF_CAPACITY, DF_USED, DF_CAPACITY - DF_USED, DF_USED, 0) };
       DatanodeCommand[] cmds = dataNodeProto.sendHeartbeat(dnRegistration,
           rep, 0L, 0L, 0, 0, 0, null, true).getCommands();
       if (cmds != null) {
diff --git a/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestDeadDatanode.java b/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestDeadDatanode.java
index 341a14978bb..14b14b2f81f 100644
--- a/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestDeadDatanode.java
+++ b/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestDeadDatanode.java
@@ -128,7 +128,7 @@ public class TestDeadDatanode {
     // that asks datanode to register again
     StorageReport[] rep = { new StorageReport(
         new DatanodeStorage(reg.getDatanodeUuid()),
-        false, 0, 0, 0, 0) };
+        false, 0, 0, 0, 0, 0) };
     DatanodeCommand[] cmd =
         dnp.sendHeartbeat(reg, rep, 0L, 0L, 0, 0, 0, null, true).getCommands();
     assertEquals(1, cmd.length);
diff --git a/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestNamenodeCapacityReport.java b/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestNamenodeCapacityReport.java
index 99323f5fa17..38ec9f803ae 100644
--- a/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestNamenodeCapacityReport.java
+++ b/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestNamenodeCapacityReport.java
@@ -71,7 +71,6 @@ public class TestNamenodeCapacityReport {
     try {
       cluster = new MiniDFSCluster.Builder(conf).build();
       cluster.waitActive();
-      
       final FSNamesystem namesystem = cluster.getNamesystem();
       final DatanodeManager dm = cluster.getNamesystem().getBlockManager(
           ).getDatanodeManager();
@@ -100,8 +99,9 @@ public class TestNamenodeCapacityReport {
             + " used " + used + " non DFS used " + nonDFSUsed 
             + " remaining " + remaining + " perentUsed " + percentUsed
             + " percentRemaining " + percentRemaining);
-        
-        assertTrue(configCapacity == (used + remaining + nonDFSUsed));
+        // There will be 5% space reserved in ext filesystem which is not
+        // considered.
+        assertTrue(configCapacity >= (used + remaining + nonDFSUsed));
         assertTrue(percentUsed == DFSUtilClient.getPercentUsed(used,
                                                                configCapacity));
         assertTrue(percentRemaining == DFSUtilClient.getPercentRemaining(
@@ -148,7 +148,9 @@ public class TestNamenodeCapacityReport {
       assertTrue(configCapacity == diskCapacity - reserved);
       
       // Ensure new total capacity reported excludes the reserved space
-      assertTrue(configCapacity == (used + remaining + nonDFSUsed));
+      // There will be 5% space reserved in ext filesystem which is not
+      // considered.
+      assertTrue(configCapacity >= (used + remaining + nonDFSUsed));
 
       // Ensure percent used is calculated based on used and present capacity
       assertTrue(percentUsed == DFSUtilClient.getPercentUsed(used,
@@ -160,9 +162,33 @@ public class TestNamenodeCapacityReport {
 
       // Ensure percent used is calculated based on used and present capacity
       assertTrue(percentRemaining == ((float)remaining * 100.0f)/(float)configCapacity);
+
+      //Adding testcase for non-dfs used where we need to consider
+      // reserved replica also.
+      final int fileCount = 5;
+      final DistributedFileSystem fs = cluster.getFileSystem();
+      // create streams and hsync to force datastreamers to start
+      DFSOutputStream[] streams = new DFSOutputStream[fileCount];
+      for (int i=0; i < fileCount; i++) {
+        streams[i] = (DFSOutputStream)fs.create(new Path("/f"+i))
+            .getWrappedStream();
+        streams[i].write("1".getBytes());
+        streams[i].hsync();
+      }
+      triggerHeartbeats(cluster.getDataNodes());
+      assertTrue(configCapacity > (namesystem.getCapacityUsed() + namesystem
+          .getCapacityRemaining() + namesystem.getNonDfsUsedSpace()));
+      // There is a chance that nonDFS usage might have slightly due to
+      // testlogs, So assume 1MB other files used within this gap
+      assertTrue(
+          (namesystem.getCapacityUsed() + namesystem.getCapacityRemaining()
+              + namesystem.getNonDfsUsedSpace() + fileCount * fs
+              .getDefaultBlockSize()) - configCapacity < 1 * 1024);
     }
     finally {
-      if (cluster != null) {cluster.shutdown();}
+      if (cluster != null) {
+        cluster.shutdown();
+      }
     }
   }
   
diff --git a/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/metrics/TestNameNodeMetrics.java b/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/metrics/TestNameNodeMetrics.java
index c4a9837f57a..9e95650d99f 100644
--- a/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/metrics/TestNameNodeMetrics.java
+++ b/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/metrics/TestNameNodeMetrics.java
@@ -166,7 +166,9 @@ public class TestNameNodeMetrics {
         MetricsAsserts.getLongGauge("CapacityRemaining", rb);
     long capacityUsedNonDFS =
         MetricsAsserts.getLongGauge("CapacityUsedNonDFS", rb);
-    assert(capacityUsed + capacityRemaining + capacityUsedNonDFS ==
+    // There will be 5% space reserved in ext filesystem which is not
+    // considered.
+    assert (capacityUsed + capacityRemaining + capacityUsedNonDFS <=
         capacityTotal);
   }