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From jh...@apache.org
Subject [hadoop] 15/33: YARN-6788. [YARN-3926] Improve performance of resource profile branch (Contributed by Sunil Govindan via Daniel Templeton)
Date Fri, 01 Feb 2019 02:51:16 GMT
This is an automated email from the ASF dual-hosted git repository.

jhung pushed a commit to branch YARN-8200
in repository https://gitbox.apache.org/repos/asf/hadoop.git

commit 097a0316b332941cb43f646f1bea6c49c4399ff7
Author: Daniel Templeton <templedf@apache.org>
AuthorDate: Fri Aug 4 08:42:34 2017 -0700

    YARN-6788. [YARN-3926] Improve performance of resource profile branch
    (Contributed by Sunil Govindan via Daniel Templeton)
    
    (cherry picked from commit 3aeaafecb823ef6c175ea5d0d9cb726faacaf32d)
---
 .../hadoop-yarn/dev-support/findbugs-exclude.xml   |  18 ++
 .../apache/hadoop/yarn/api/records/Resource.java   | 234 ++++++++-------------
 .../yarn/api/records/ResourceInformation.java      |  13 +-
 .../hadoop/yarn/api/records/impl/BaseResource.java | 133 ++++++++++++
 .../hadoop/yarn/api/records/impl/package-info.java |  22 ++
 .../hadoop/yarn/util/UnitsConversionUtil.java      |   8 +-
 .../hadoop/yarn/util/resource/ResourceUtils.java   | 214 +++++++++++--------
 .../hadoop/yarn/util/resource/package-info.java    |  22 ++
 .../yarn/api/records/impl/pb/ProtoUtils.java       |   5 +-
 .../yarn/api/records/impl/pb/ResourcePBImpl.java   | 110 +++++-----
 .../util/resource/DominantResourceCalculator.java  |  67 +++---
 .../hadoop/yarn/util/resource/Resources.java       | 194 ++++++++---------
 .../yarn/util/resource/TestResourceUtils.java      |  14 +-
 .../hadoop/yarn/util/resource/TestResources.java   |   7 +-
 .../rmapp/attempt/RMAppAttemptMetrics.java         |  11 +-
 .../scheduler/SchedulerApplicationAttempt.java     |   9 +-
 .../resourcemanager/webapp/dao/SchedulerInfo.java  |   3 +-
 .../server/resourcemanager/TestAppManager.java     |   1 +
 18 files changed, 627 insertions(+), 458 deletions(-)

diff --git a/hadoop-yarn-project/hadoop-yarn/dev-support/findbugs-exclude.xml b/hadoop-yarn-project/hadoop-yarn/dev-support/findbugs-exclude.xml
index c129203..e086fbe 100644
--- a/hadoop-yarn-project/hadoop-yarn/dev-support/findbugs-exclude.xml
+++ b/hadoop-yarn-project/hadoop-yarn/dev-support/findbugs-exclude.xml
@@ -615,4 +615,22 @@
     <Bug pattern="IS2_INCONSISTENT_SYNC" />
   </Match>
 
+  <!-- Ignore MS_EXPOSE_REP -->
+    <Match>
+    <Class name="org.apache.hadoop.yarn.util.resource.ResourceUtils" />
+    <Method name="getResourceTypesArray" />
+    <Bug pattern="MS_EXPOSE_REP" />
+  </Match>
+
+  <Match>
+    <Class name="org.apache.hadoop.yarn.util.resource.ResourceUtils" />
+    <Method name="getResourceNamesArray" />
+    <Bug pattern="MS_EXPOSE_REP" />
+  </Match>
+
+  <Match>
+    <Class name="org.apache.hadoop.yarn.api.records.impl.BaseResource" />
+    <Method name="getResources" />
+    <Bug pattern="EI_EXPOSE_REP" />
+  </Match>
 </FindBugsFilter>
diff --git a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-api/src/main/java/org/apache/hadoop/yarn/api/records/Resource.java b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-api/src/main/java/org/apache/hadoop/yarn/api/records/Resource.java
index fb31745..bbd4c87 100644
--- a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-api/src/main/java/org/apache/hadoop/yarn/api/records/Resource.java
+++ b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-api/src/main/java/org/apache/hadoop/yarn/api/records/Resource.java
@@ -18,6 +18,8 @@
 
 package org.apache.hadoop.yarn.api.records;
 
+import java.util.Arrays;
+
 import org.apache.commons.lang.NotImplementedException;
 import org.apache.hadoop.classification.InterfaceAudience;
 import org.apache.hadoop.classification.InterfaceAudience.Public;
@@ -25,13 +27,10 @@ import org.apache.hadoop.classification.InterfaceStability;
 import org.apache.hadoop.classification.InterfaceStability.Evolving;
 import org.apache.hadoop.classification.InterfaceStability.Stable;
 import org.apache.hadoop.yarn.api.ApplicationMasterProtocol;
+import org.apache.hadoop.yarn.api.records.impl.BaseResource;
 import org.apache.hadoop.yarn.exceptions.ResourceNotFoundException;
-import org.apache.hadoop.yarn.exceptions.YarnException;
 import org.apache.hadoop.yarn.util.Records;
-
-import java.util.Collections;
-import java.util.HashMap;
-import java.util.Map;
+import org.apache.hadoop.yarn.util.resource.ResourceUtils;
 
 /**
  * <p><code>Resource</code> models a set of computer resources in the 
@@ -60,97 +59,49 @@ import java.util.Map;
 @Stable
 public abstract class Resource implements Comparable<Resource> {
 
-  private static Resource tmpResource = Records.newRecord(Resource.class);
-
-  private static class SimpleResource extends Resource {
-    private long memory;
-    private long vcores;
-    private Map<String, ResourceInformation> resourceInformationMap;
-
-    SimpleResource(long memory, long vcores) {
-      this.memory = memory;
-      this.vcores = vcores;
-
-    }
-    @Override
-    public int getMemory() {
-      return castToIntSafely(memory);
-    }
-    @Override
-    public void setMemory(int memory) {
-      this.memory = memory;
-    }
-    @Override
-    public long getMemorySize() {
-      return memory;
-    }
-    @Override
-    public void setMemorySize(long memory) {
-      this.memory = memory;
-    }
-    @Override
-    public int getVirtualCores() {
-      return castToIntSafely(vcores);
-    }
-    @Override
-    public void setVirtualCores(int vcores) {
-      this.vcores = vcores;
-    }
-    @Override
-    public Map<String, ResourceInformation> getResources() {
-      if (resourceInformationMap == null) {
-        resourceInformationMap = new HashMap<>();
-        resourceInformationMap.put(ResourceInformation.MEMORY_MB.getName(),
-            ResourceInformation.newInstance(ResourceInformation.MEMORY_MB));
-        resourceInformationMap.put(ResourceInformation.VCORES.getName(),
-            ResourceInformation.newInstance(ResourceInformation.VCORES));
-      }
-      resourceInformationMap.get(ResourceInformation.MEMORY_MB.getName())
-          .setValue(this.memory);
-      resourceInformationMap.get(ResourceInformation.VCORES.getName())
-          .setValue(this.vcores);
-      return Collections.unmodifiableMap(resourceInformationMap);
-    }
-  }
+  protected static final String MEMORY = ResourceInformation.MEMORY_MB.getName();
+  protected static final String VCORES = ResourceInformation.VCORES.getName();
 
   @Public
   @Stable
   public static Resource newInstance(int memory, int vCores) {
-    if (tmpResource.getResources().size() > 2) {
+    if (ResourceUtils.getResourceTypesArray().length > 2) {
       Resource ret = Records.newRecord(Resource.class);
       ret.setMemorySize(memory);
       ret.setVirtualCores(vCores);
       return ret;
     }
-    return new SimpleResource(memory, vCores);
+    return new BaseResource(memory, vCores);
   }
 
   @Public
   @Stable
   public static Resource newInstance(long memory, int vCores) {
-    if (tmpResource.getResources().size() > 2) {
+    if (ResourceUtils.getResourceTypesArray().length > 2) {
       Resource ret = Records.newRecord(Resource.class);
       ret.setMemorySize(memory);
       ret.setVirtualCores(vCores);
       return ret;
     }
-    return new SimpleResource(memory, vCores);
+    return new BaseResource(memory, vCores);
   }
 
   @InterfaceAudience.Private
   @InterfaceStability.Unstable
   public static Resource newInstance(Resource resource) {
-    Resource ret = Resource.newInstance(0, 0);
-    Resource.copy(resource, ret);
+    Resource ret = Resource.newInstance(resource.getMemorySize(),
+        resource.getVirtualCores());
+    if (ResourceUtils.getResourceTypesArray().length > 2) {
+      Resource.copy(resource, ret);
+    }
     return ret;
   }
 
   @InterfaceAudience.Private
   @InterfaceStability.Unstable
   public static void copy(Resource source, Resource dest) {
-    for (Map.Entry<String, ResourceInformation> entry : source.getResources()
-        .entrySet()) {
-      dest.setResourceInformation(entry.getKey(), entry.getValue());
+    for (ResourceInformation entry : source.getResources()) {
+      dest.setResourceInformation(entry.getName(), entry);
     }
   }
 
@@ -251,25 +202,26 @@ public abstract class Resource implements Comparable<Resource> {
    */
   @Public
   @Evolving
-  public abstract Map<String, ResourceInformation> getResources();
+  public abstract ResourceInformation[] getResources();
 
   /**
    * Get ResourceInformation for a specified resource.
    *
    * @param resource name of the resource
    * @return the ResourceInformation object for the resource
-   * @throws YarnException if the resource can't be found
+   * @throws ResourceNotFoundException if the resource can't be found
    */
   @Public
   @Evolving
   public ResourceInformation getResourceInformation(String resource)
-      throws YarnException {
-    if (getResources().containsKey(resource)) {
-      return getResources().get(resource);
+      throws ResourceNotFoundException {
+    Integer index = ResourceUtils.getResourceTypeIndex().get(resource);
+    ResourceInformation[] resources = getResources();
+    if (index != null) {
+      return resources[index];
     }
-    throw new YarnException(
-        "Unknown resource '" + resource + "'. Known resources are "
-            + getResources().keySet());
+    throw new ResourceNotFoundException("Unknown resource '" + resource
+        + "'. Known resources are " + Arrays.toString(resources));
   }
 
   /**
@@ -278,17 +230,13 @@ public abstract class Resource implements Comparable<Resource> {
    *
    * @param resource name of the resource
    * @return the value for the resource
-   * @throws YarnException if the resource can't be found
+   * @throws ResourceNotFoundException if the resource can't be found
    */
   @Public
   @Evolving
-  public Long getResourceValue(String resource) throws YarnException {
-    if (getResources().containsKey(resource)) {
-      return getResources().get(resource).getValue();
-    }
-    throw new YarnException(
-        "Unknown resource '" + resource + "'. Known resources are "
-            + getResources().keySet());
+  public long getResourceValue(String resource)
+      throws ResourceNotFoundException {
+    return getResourceInformation(resource).getValue();
   }
 
   /**
@@ -301,23 +249,18 @@ public abstract class Resource implements Comparable<Resource> {
   @Public
   @Evolving
   public void setResourceInformation(String resource,
-      ResourceInformation resourceInformation) throws ResourceNotFoundException {
-    if (resource.equals(ResourceInformation.MEMORY_MB.getName())) {
+      ResourceInformation resourceInformation)
+      throws ResourceNotFoundException {
+    if (resource.equals(MEMORY)) {
       this.setMemorySize(resourceInformation.getValue());
       return;
     }
-    if (resource.equals(ResourceInformation.VCORES.getName())) {
+    if (resource.equals(VCORES)) {
       this.setVirtualCores((int) resourceInformation.getValue());
       return;
     }
-    if (getResources().containsKey(resource)) {
-      ResourceInformation
-          .copy(resourceInformation, getResources().get(resource));
-      return;
-    }
-    throw new ResourceNotFoundException(
-        "Unknown resource '" + resource + "'. Known resources are "
-            + getResources().keySet());
+    ResourceInformation storedResourceInfo = getResourceInformation(resource);
+    ResourceInformation.copy(resourceInformation, storedResourceInfo);
   }
 
   /**
@@ -332,21 +275,17 @@ public abstract class Resource implements Comparable<Resource> {
   @Evolving
   public void setResourceValue(String resource, Long value)
       throws ResourceNotFoundException {
-    if (resource.equals(ResourceInformation.MEMORY_MB.getName())) {
+    if (resource.equals(MEMORY)) {
       this.setMemorySize(value);
       return;
     }
-    if (resource.equals(ResourceInformation.VCORES.getName())) {
+    if (resource.equals(VCORES)) {
       this.setVirtualCores(value.intValue());
       return;
     }
-    if (getResources().containsKey(resource)) {
-      getResources().get(resource).setValue(value);
-      return;
-    }
-    throw new ResourceNotFoundException(
-        "Unknown resource '" + resource + "'. Known resources are "
-            + getResources().keySet());
+
+    ResourceInformation storedResourceInfo = getResourceInformation(resource);
+    storedResourceInfo.setValue(value);
   }
 
   @Override
@@ -356,13 +295,10 @@ public abstract class Resource implements Comparable<Resource> {
     int result = (int) (939769357
         + getMemorySize()); // prime * result = 939769357 initially
     result = prime * result + getVirtualCores();
-    for (Map.Entry<String, ResourceInformation> entry : getResources()
-        .entrySet()) {
-      if (entry.getKey().equals(ResourceInformation.MEMORY_MB.getName())
-          || entry.getKey().equals(ResourceInformation.VCORES.getName())) {
-        continue;
+    for (ResourceInformation entry : getResources()) {
+      if (!entry.getName().equals(MEMORY) && !entry.getName().equals(VCORES)) {
+        result = prime * result + entry.hashCode();
       }
-      result = prime * result + entry.getValue().hashCode();
     }
     return result;
   }
@@ -379,11 +315,26 @@ public abstract class Resource implements Comparable<Resource> {
       return false;
     }
     Resource other = (Resource) obj;
-    if (getMemorySize() != other.getMemorySize() || getVirtualCores() != other
-        .getVirtualCores()) {
+    if (getMemorySize() != other.getMemorySize()
+        || getVirtualCores() != other.getVirtualCores()) {
+      return false;
+    }
+
+    ResourceInformation[] myVectors = getResources();
+    ResourceInformation[] otherVectors = other.getResources();
+
+    if (myVectors.length != otherVectors.length) {
       return false;
     }
-    return this.getResources().equals(other.getResources());
+
+    for (int i = 0; i < myVectors.length; i++) {
+      ResourceInformation a = myVectors[i];
+      ResourceInformation b = otherVectors[i];
+      if ((a != b) && ((a == null) || !a.equals(b))) {
+        return false;
+      }
+    }
+    return true;
   }
 
   @Override
@@ -391,21 +342,20 @@ public abstract class Resource implements Comparable<Resource> {
     StringBuilder sb = new StringBuilder();
     sb.append("<memory:").append(getMemorySize()).append(", vCores:")
         .append(getVirtualCores());
-    for (Map.Entry<String, ResourceInformation> entry : getResources()
-        .entrySet()) {
-      if (entry.getKey().equals(ResourceInformation.MEMORY_MB.getName())
-          && entry.getValue().getUnits()
+    for (ResourceInformation entry : getResources()) {
+      if (entry.getName().equals(MEMORY)
+          && entry.getUnits()
           .equals(ResourceInformation.MEMORY_MB.getUnits())) {
         continue;
       }
-      if (entry.getKey().equals(ResourceInformation.VCORES.getName())
-          && entry.getValue().getUnits()
+      if (entry.getName().equals(VCORES)
+          && entry.getUnits()
           .equals(ResourceInformation.VCORES.getUnits())) {
         continue;
       }
-      sb.append(", ").append(entry.getKey()).append(": ")
-          .append(entry.getValue().getValue())
-          .append(entry.getValue().getUnits());
+      sb.append(", ").append(entry.getName()).append(": ")
+          .append(entry.getValue())
+          .append(entry.getUnits());
     }
     sb.append(">");
     return sb.toString();
@@ -413,28 +363,30 @@ public abstract class Resource implements Comparable<Resource> {
 
   @Override
   public int compareTo(Resource other) {
-    Map<String, ResourceInformation> thisResources, otherResources;
-    thisResources = this.getResources();
-    otherResources = other.getResources();
-    long diff = thisResources.size() - otherResources.size();
+    ResourceInformation[] thisResources = this.getResources();
+    ResourceInformation[] otherResources = other.getResources();
+
+    // compare memory and vcores first(in that order) to preserve
+    // existing behaviour
+    long diff = this.getMemorySize() - other.getMemorySize();
     if (diff == 0) {
-      // compare memory and vcores first(in that order) to preserve
-      // existing behaviour
-      if (thisResources.keySet().equals(otherResources.keySet())) {
-        diff = this.getMemorySize() - other.getMemorySize();
-        if (diff == 0) {
-          diff = this.getVirtualCores() - other.getVirtualCores();
-        }
-        if (diff == 0) {
-          for (Map.Entry<String, ResourceInformation> entry : thisResources
-              .entrySet()) {
-            if (entry.getKey().equals(ResourceInformation.MEMORY_MB.getName())
-                || entry.getKey()
-                .equals(ResourceInformation.VCORES.getName())) {
-              continue;
-            }
-            diff =
-                entry.getValue().compareTo(otherResources.get(entry.getKey()));
+      diff = this.getVirtualCores() - other.getVirtualCores();
+    }
+    if (diff == 0) {
+      diff = thisResources.length - otherResources.length;
+      if (diff == 0) {
+        int maxLength = ResourceUtils.getResourceTypesArray().length;
+        for (int i = 0; i < maxLength; i++) {
+          // For memory and vcores, we can skip the loop as it's already
+          // compared.
+          if (i < 2) {
+            continue;
+          }
+
+          ResourceInformation entry = thisResources[i];
+          ResourceInformation otherEntry = otherResources[i];
+          if (entry.getName().equals(otherEntry.getName())) {
+            diff = entry.compareTo(otherEntry);
             if (diff != 0) {
               break;
             }
diff --git a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-api/src/main/java/org/apache/hadoop/yarn/api/records/ResourceInformation.java b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-api/src/main/java/org/apache/hadoop/yarn/api/records/ResourceInformation.java
index 7c0f055..4717d82 100644
--- a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-api/src/main/java/org/apache/hadoop/yarn/api/records/ResourceInformation.java
+++ b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-api/src/main/java/org/apache/hadoop/yarn/api/records/ResourceInformation.java
@@ -242,10 +242,15 @@ public class ResourceInformation implements Comparable<ResourceInformation> {
       return false;
     }
     ResourceInformation r = (ResourceInformation) obj;
-    int cmp =
-        UnitsConversionUtil.compare(this.units, this.value, r.units, r.value);
-    return this.name.equals(r.getName()) && this.resourceType
-        .equals(r.getResourceType()) && (cmp == 0);
+    if (!this.name.equals(r.getName())
+        || !this.resourceType.equals(r.getResourceType())) {
+      return false;
+    }
+    if (this.units.equals(r.units)) {
+      return this.value == r.value;
+    }
+    return (UnitsConversionUtil.compare(this.units, this.value, r.units,
+        r.value) == 0);
   }
 
   @Override
diff --git a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-api/src/main/java/org/apache/hadoop/yarn/api/records/impl/BaseResource.java b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-api/src/main/java/org/apache/hadoop/yarn/api/records/impl/BaseResource.java
new file mode 100644
index 0000000..83db542
--- /dev/null
+++ b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-api/src/main/java/org/apache/hadoop/yarn/api/records/impl/BaseResource.java
@@ -0,0 +1,133 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.hadoop.yarn.api.records.impl;
+
+import org.apache.hadoop.classification.InterfaceAudience.Public;
+import org.apache.hadoop.classification.InterfaceStability.Unstable;
+import org.apache.hadoop.yarn.api.records.Resource;
+import org.apache.hadoop.yarn.api.records.ResourceInformation;
+
+import java.util.Arrays;
+
+/**
+ * <p>
+ * <code>BaseResource</code> extends Resource to handle base resources such
+ * as memory and CPU.
+ * TODO: We have a long term plan to use AbstractResource when additional
+ * resource types are to be handled as well.
+ * </p>
+ *
+ * <p>
+ * Currently it models both <em>memory</em> and <em>CPU</em>.
+ * </p>
+ *
+ * <p>
+ * The unit for memory is megabytes. CPU is modeled with virtual cores (vcores),
+ * a unit for expressing parallelism. A node's capacity should be configured
+ * with virtual cores equal to its number of physical cores. A container should
+ * be requested with the number of cores it can saturate, i.e. the average
+ * number of threads it expects to have runnable at a time.
+ * </p>
+ *
+ * <p>
+ * Virtual cores take integer values and thus currently CPU-scheduling is very
+ * coarse. A complementary axis for CPU requests that represents processing
+ * power will likely be added in the future to enable finer-grained resource
+ * configuration.
+ * </p>
+ *
+ * @see Resource
+ */
+@Public
+@Unstable
+public class BaseResource extends Resource {
+
+  private ResourceInformation memoryResInfo;
+  private ResourceInformation vcoresResInfo;
+  protected ResourceInformation[] resources = null;
+  protected ResourceInformation[] readOnlyResources = null;
+
+  protected enum MandatoryResources {
+    MEMORY(0), VCORES(1);
+
+    private final int id;
+
+    MandatoryResources(int id) {
+      this.id = id;
+    }
+
+    public int getId() {
+      return this.id;
+    }
+  }
+
+  public BaseResource() {
+    // Base constructor.
+  }
+
+  public BaseResource(long memory, long vcores) {
+    this.memoryResInfo = ResourceInformation.newInstance(MEMORY,
+        ResourceInformation.MEMORY_MB.getUnits(), memory);
+    this.vcoresResInfo = ResourceInformation.newInstance(VCORES, "", vcores);
+
+    resources = new ResourceInformation[MandatoryResources.values().length];
+    readOnlyResources = new ResourceInformation[MandatoryResources
+        .values().length];
+    resources[MandatoryResources.MEMORY.id] = memoryResInfo;
+    resources[MandatoryResources.VCORES.id] = vcoresResInfo;
+    readOnlyResources = Arrays.copyOf(resources, resources.length);
+  }
+
+  @Override
+  @SuppressWarnings("deprecation")
+  public int getMemory() {
+    return (int) memoryResInfo.getValue();
+  }
+
+  @Override
+  @SuppressWarnings("deprecation")
+  public void setMemory(int memory) {
+    this.memoryResInfo.setValue(memory);
+  }
+
+  @Override
+  public long getMemorySize() {
+    return memoryResInfo.getValue();
+  }
+
+  @Override
+  public void setMemorySize(long memory) {
+    this.memoryResInfo.setValue(memory);
+  }
+
+  @Override
+  public int getVirtualCores() {
+    return (int) vcoresResInfo.getValue();
+  }
+
+  @Override
+  public void setVirtualCores(int vcores) {
+    this.vcoresResInfo.setValue(vcores);
+  }
+
+  @Override
+  public ResourceInformation[] getResources() {
+    return readOnlyResources;
+  }
+}
diff --git a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-api/src/main/java/org/apache/hadoop/yarn/api/records/impl/package-info.java b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-api/src/main/java/org/apache/hadoop/yarn/api/records/impl/package-info.java
new file mode 100644
index 0000000..d04e339
--- /dev/null
+++ b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-api/src/main/java/org/apache/hadoop/yarn/api/records/impl/package-info.java
@@ -0,0 +1,22 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+@InterfaceAudience.Public
+@InterfaceStability.Unstable
+package org.apache.hadoop.yarn.api.records.impl;
+import org.apache.hadoop.classification.InterfaceAudience;
+import org.apache.hadoop.classification.InterfaceStability;
\ No newline at end of file
diff --git a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-api/src/main/java/org/apache/hadoop/yarn/util/UnitsConversionUtil.java b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-api/src/main/java/org/apache/hadoop/yarn/util/UnitsConversionUtil.java
index c7663de..7b737bc 100644
--- a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-api/src/main/java/org/apache/hadoop/yarn/util/UnitsConversionUtil.java
+++ b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-api/src/main/java/org/apache/hadoop/yarn/util/UnitsConversionUtil.java
@@ -186,11 +186,11 @@ public class UnitsConversionUtil {
     if (!KNOWN_UNITS.contains(unitB)) {
       throw new IllegalArgumentException("Unknown unit '" + unitB + "'");
     }
-    Converter unitAC = getConverter(unitA);
-    Converter unitBC = getConverter(unitB);
     if (unitA.equals(unitB)) {
-      return Long.valueOf(valueA).compareTo(valueB);
+      return Long.compare(valueA, valueB);
     }
+    Converter unitAC = getConverter(unitA);
+    Converter unitBC = getConverter(unitB);
     int unitAPos = SORTED_UNITS.indexOf(unitA);
     int unitBPos = SORTED_UNITS.indexOf(unitB);
     try {
@@ -201,7 +201,7 @@ public class UnitsConversionUtil {
       } else {
         tmpA = convert(unitA, unitB, valueA);
       }
-      return Long.valueOf(tmpA).compareTo(tmpB);
+      return Long.compare(tmpA, tmpB);
     } catch (IllegalArgumentException ie) {
       BigInteger tmpA = BigInteger.valueOf(valueA);
       BigInteger tmpB = BigInteger.valueOf(valueB);
diff --git a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-common/src/main/java/org/apache/hadoop/yarn/util/resource/ResourceUtils.java b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-api/src/main/java/org/apache/hadoop/yarn/util/resource/ResourceUtils.java
similarity index 72%
rename from hadoop-yarn-project/hadoop-yarn/hadoop-yarn-common/src/main/java/org/apache/hadoop/yarn/util/resource/ResourceUtils.java
rename to hadoop-yarn-project/hadoop-yarn/hadoop-yarn-api/src/main/java/org/apache/hadoop/yarn/util/resource/ResourceUtils.java
index 86cf872..49feafa 100644
--- a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-common/src/main/java/org/apache/hadoop/yarn/util/resource/ResourceUtils.java
+++ b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-api/src/main/java/org/apache/hadoop/yarn/util/resource/ResourceUtils.java
@@ -42,6 +42,7 @@ import java.util.HashMap;
 import java.util.HashSet;
 import java.util.Map;
 import java.util.Set;
+import java.util.concurrent.ConcurrentHashMap;
 
 /**
  * Helper class to read the resource-types to be supported by the system.
@@ -65,11 +66,14 @@ public class ResourceUtils {
     DISALLOWED_NAMES.add(VCORES);
   }
 
-  private static volatile Object lock;
-  private static Map<String, ResourceInformation> readOnlyResources;
-  private static volatile Object nodeLock;
-  private static Map<String, ResourceInformation> readOnlyNodeResources;
-
+  private static volatile boolean initializedResources = false;
+  private static final Map<String, Integer> RESOURCE_NAME_TO_INDEX =
+      new ConcurrentHashMap<String, Integer>();
+  private static volatile Map<String, ResourceInformation> resourceTypes;
+  private static volatile String[] resourceNamesArray;
+  private static volatile ResourceInformation[] resourceTypesArray;
+  private static volatile boolean initializedNodeResources = false;
+  private static volatile Map<String, ResourceInformation> readOnlyNodeResources;
 
   static final Log LOG = LogFactory.getLog(ResourceUtils.class);
 
@@ -127,21 +131,17 @@ public class ResourceUtils {
 
   private static void setMinimumAllocationForMandatoryResources(
       Map<String, ResourceInformation> res, Configuration conf) {
-    String[][] resourceTypesKeys =
-        {
-          { ResourceInformation.MEMORY_MB.getName(),
+    String[][] resourceTypesKeys = {
+        {ResourceInformation.MEMORY_MB.getName(),
             YarnConfiguration.RM_SCHEDULER_MINIMUM_ALLOCATION_MB,
             String.valueOf(
-              YarnConfiguration.DEFAULT_RM_SCHEDULER_MINIMUM_ALLOCATION_MB),
-            ResourceInformation.MEMORY_MB.getName()
-          },
-          { ResourceInformation.VCORES.getName(),
+                YarnConfiguration.DEFAULT_RM_SCHEDULER_MINIMUM_ALLOCATION_MB),
+            ResourceInformation.MEMORY_MB.getName()},
+        {ResourceInformation.VCORES.getName(),
             YarnConfiguration.RM_SCHEDULER_MINIMUM_ALLOCATION_VCORES,
             String.valueOf(
-              YarnConfiguration.DEFAULT_RM_SCHEDULER_MINIMUM_ALLOCATION_VCORES),
-            ResourceInformation.VCORES.getName()
-          }
-        };
+                YarnConfiguration.DEFAULT_RM_SCHEDULER_MINIMUM_ALLOCATION_VCORES),
+            ResourceInformation.VCORES.getName()}};
     for (String[] arr : resourceTypesKeys) {
       String resourceTypesKey =
           YarnConfiguration.RESOURCE_TYPES + "." + arr[0] + MINIMUM_ALLOCATION;
@@ -166,23 +166,17 @@ public class ResourceUtils {
 
   private static void setMaximumAllocationForMandatoryResources(
       Map<String, ResourceInformation> res, Configuration conf) {
-    String[][] resourceTypesKeys =
-        {
-          {
-            ResourceInformation.MEMORY_MB.getName(),
+    String[][] resourceTypesKeys = {
+        {ResourceInformation.MEMORY_MB.getName(),
             YarnConfiguration.RM_SCHEDULER_MAXIMUM_ALLOCATION_MB,
             String.valueOf(
-              YarnConfiguration.DEFAULT_RM_SCHEDULER_MAXIMUM_ALLOCATION_MB),
-            ResourceInformation.MEMORY_MB.getName()
-          },
-          {
-            ResourceInformation.VCORES.getName(),
+                YarnConfiguration.DEFAULT_RM_SCHEDULER_MAXIMUM_ALLOCATION_MB),
+            ResourceInformation.MEMORY_MB.getName()},
+        {ResourceInformation.VCORES.getName(),
             YarnConfiguration.RM_SCHEDULER_MAXIMUM_ALLOCATION_VCORES,
             String.valueOf(
-              YarnConfiguration.DEFAULT_RM_SCHEDULER_MAXIMUM_ALLOCATION_VCORES),
-             ResourceInformation.VCORES.getName()
-          }
-        };
+                YarnConfiguration.DEFAULT_RM_SCHEDULER_MAXIMUM_ALLOCATION_VCORES),
+            ResourceInformation.VCORES.getName()}};
     for (String[] arr : resourceTypesKeys) {
       String resourceTypesKey =
           YarnConfiguration.RESOURCE_TYPES + "." + arr[0] + MAXIMUM_ALLOCATION;
@@ -251,7 +245,50 @@ public class ResourceUtils {
     addManadtoryResources(resourceInformationMap);
     setMinimumAllocationForMandatoryResources(resourceInformationMap, conf);
     setMaximumAllocationForMandatoryResources(resourceInformationMap, conf);
-    readOnlyResources = Collections.unmodifiableMap(resourceInformationMap);
+    resourceTypes = Collections.unmodifiableMap(resourceInformationMap);
+    updateKnownResources();
+    updateResourceTypeIndex();
+  }
+
+  private static void updateKnownResources() {
+    // Update resource names.
+    resourceNamesArray = new String[resourceTypes.size()];
+    resourceTypesArray = new ResourceInformation[resourceTypes.size()];
+
+    int index = 2;
+    for (ResourceInformation resInfo : resourceTypes.values()) {
+      if (resInfo.getName().equals(MEMORY)) {
+        resourceTypesArray[0] = ResourceInformation
+            .newInstance(resourceTypes.get(MEMORY));
+        resourceNamesArray[0] = MEMORY;
+      } else if (resInfo.getName().equals(VCORES)) {
+        resourceTypesArray[1] = ResourceInformation
+            .newInstance(resourceTypes.get(VCORES));
+        resourceNamesArray[1] = VCORES;
+      } else {
+        resourceTypesArray[index] = ResourceInformation.newInstance(resInfo);
+        resourceNamesArray[index] = resInfo.getName();
+        index++;
+      }
+    }
+  }
+
+  private static void updateResourceTypeIndex() {
+    RESOURCE_NAME_TO_INDEX.clear();
+
+    for (int index = 0; index < resourceTypesArray.length; index++) {
+      ResourceInformation resInfo = resourceTypesArray[index];
+      RESOURCE_NAME_TO_INDEX.put(resInfo.getName(), index);
+    }
+  }
+
+  /**
+   * Get associate index of resource types such memory, cpu etc.
+   * This could help to access each resource types in a resource faster.
+   * @return Index map for all Resource Types.
+   */
+  public static Map<String, Integer> getResourceTypeIndex() {
+    return RESOURCE_NAME_TO_INDEX;
   }
 
   /**
@@ -264,6 +301,22 @@ public class ResourceUtils {
         YarnConfiguration.RESOURCE_TYPES_CONFIGURATION_FILE);
   }
 
+  /**
+   * Get resource names array, this is mostly for performance perspective. Never
+   * modify returned array.
+   *
+   * @return resourceNamesArray
+   */
+  public static String[] getResourceNamesArray() {
+    getResourceTypes(null, YarnConfiguration.RESOURCE_TYPES_CONFIGURATION_FILE);
+    return resourceNamesArray;
+  }
+
+  public static ResourceInformation[] getResourceTypesArray() {
+    getResourceTypes(null, YarnConfiguration.RESOURCE_TYPES_CONFIGURATION_FILE);
+    return resourceTypesArray;
+  }
+
   private static Map<String, ResourceInformation> getResourceTypes(
       Configuration conf) {
     return getResourceTypes(conf,
@@ -272,30 +325,28 @@ public class ResourceUtils {
 
   private static Map<String, ResourceInformation> getResourceTypes(
       Configuration conf, String resourceFile) {
-    if (lock == null) {
+    if (!initializedResources) {
       synchronized (ResourceUtils.class) {
-        if (lock == null) {
-          synchronized (ResourceUtils.class) {
-            Map<String, ResourceInformation> resources = new HashMap<>();
-            if (conf == null) {
-              conf = new YarnConfiguration();
-            }
-            try {
-              addResourcesFileToConf(resourceFile, conf);
-              LOG.debug("Found " + resourceFile + ", adding to configuration");
-              initializeResourcesMap(conf, resources);
-              lock = new Object();
-            } catch (FileNotFoundException fe) {
-              LOG.info("Unable to find '" + resourceFile
-                  + "'. Falling back to memory and vcores as resources", fe);
-              initializeResourcesMap(conf, resources);
-              lock = new Object();
-            }
+        if (!initializedResources) {
+          Map<String, ResourceInformation> resources = new HashMap<>();
+          if (conf == null) {
+            conf = new YarnConfiguration();
+          }
+          try {
+            addResourcesFileToConf(resourceFile, conf);
+            LOG.debug("Found " + resourceFile + ", adding to configuration");
+            initializeResourcesMap(conf, resources);
+            initializedResources = true;
+          } catch (FileNotFoundException fe) {
+            LOG.info("Unable to find '" + resourceFile
+                + "'. Falling back to memory and vcores as resources", fe);
+            initializeResourcesMap(conf, resources);
+            initializedResources = true;
           }
         }
       }
     }
-    return readOnlyResources;
+    return resourceTypes;
   }
 
   private static InputStream getConfInputStream(String resourceFile,
@@ -341,13 +392,15 @@ public class ResourceUtils {
   }
 
   @VisibleForTesting
-  static void resetResourceTypes() {
-    lock = null;
+  synchronized static void resetResourceTypes() {
+    initializedResources = false;
   }
 
   @VisibleForTesting
   public static void resetResourceTypes(Configuration conf) {
-    lock = null;
+    synchronized (ResourceUtils.class) {
+      initializedResources = false;
+    }
     getResourceTypes(conf);
   }
 
@@ -375,17 +428,17 @@ public class ResourceUtils {
    */
   public static Map<String, ResourceInformation> getNodeResourceInformation(
       Configuration conf) {
-    if (nodeLock == null) {
+    if (!initializedNodeResources) {
       synchronized (ResourceUtils.class) {
-        if (nodeLock == null) {
-          synchronized (ResourceUtils.class) {
-            Map<String, ResourceInformation> nodeResources =
-                initializeNodeResourceInformation(conf);
-            addManadtoryResources(nodeResources);
-            checkMandatatoryResources(nodeResources);
-            readOnlyNodeResources = Collections.unmodifiableMap(nodeResources);
-            nodeLock = new Object();
-          }
+        if (!initializedNodeResources) {
+          Map<String, ResourceInformation> nodeResources = initializeNodeResourceInformation(
+              conf);
+          addManadtoryResources(nodeResources);
+          checkMandatatoryResources(nodeResources);
+          setMinimumAllocationForMandatoryResources(nodeResources, conf);
+          setMaximumAllocationForMandatoryResources(nodeResources, conf);
+          readOnlyNodeResources = Collections.unmodifiableMap(nodeResources);
+          initializedNodeResources = true;
         }
       }
     }
@@ -433,28 +486,24 @@ public class ResourceUtils {
 
   @VisibleForTesting
   synchronized public static void resetNodeResources() {
-    nodeLock = null;
+    initializedNodeResources = false;
   }
 
   public static Resource getResourceTypesMinimumAllocation() {
-    Map<String, ResourceInformation> resourceTypes = getResourceTypes();
     Resource ret = Resource.newInstance(0, 0);
-    for (Map.Entry<String, ResourceInformation> entry : resourceTypes
-        .entrySet()) {
-      String name = entry.getKey();
+    for (ResourceInformation entry : resourceTypesArray) {
+      String name = entry.getName();
       if (name.equals(ResourceInformation.MEMORY_MB.getName())) {
-        ret.setMemorySize(entry.getValue().getMinimumAllocation());
-        continue;
-      }
-      if (name.equals(ResourceInformation.VCORES.getName())) {
-        Long tmp = entry.getValue().getMinimumAllocation();
+        ret.setMemorySize(entry.getMinimumAllocation());
+      } else if (name.equals(ResourceInformation.VCORES.getName())) {
+        Long tmp = entry.getMinimumAllocation();
         if (tmp > Integer.MAX_VALUE) {
           tmp = (long) Integer.MAX_VALUE;
         }
         ret.setVirtualCores(tmp.intValue());
-        continue;
+      } else {
+        ret.setResourceValue(name, entry.getMinimumAllocation());
       }
-      ret.setResourceValue(name, entry.getValue().getMinimumAllocation());
     }
     return ret;
   }
@@ -464,24 +513,21 @@ public class ResourceUtils {
    * @return a Resource object with the maximum allocation for the scheduler
    */
   public static Resource getResourceTypesMaximumAllocation() {
-    Map<String, ResourceInformation> resourceTypes = getResourceTypes();
     Resource ret = Resource.newInstance(0, 0);
-    for (Map.Entry<String, ResourceInformation> entry : resourceTypes
-        .entrySet()) {
-      String name = entry.getKey();
+    for (ResourceInformation entry : resourceTypesArray) {
+      String name = entry.getName();
       if (name.equals(ResourceInformation.MEMORY_MB.getName())) {
-        ret.setMemorySize(entry.getValue().getMaximumAllocation());
-        continue;
-      }
-      if (name.equals(ResourceInformation.VCORES.getName())) {
-        Long tmp = entry.getValue().getMaximumAllocation();
+        ret.setMemorySize(entry.getMaximumAllocation());
+      } else if (name.equals(ResourceInformation.VCORES.getName())) {
+        Long tmp = entry.getMaximumAllocation();
         if (tmp > Integer.MAX_VALUE) {
           tmp = (long) Integer.MAX_VALUE;
         }
         ret.setVirtualCores(tmp.intValue());
         continue;
+      } else {
+        ret.setResourceValue(name, entry.getMaximumAllocation());
       }
-      ret.setResourceValue(name, entry.getValue().getMaximumAllocation());
     }
     return ret;
   }
diff --git a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-api/src/main/java/org/apache/hadoop/yarn/util/resource/package-info.java b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-api/src/main/java/org/apache/hadoop/yarn/util/resource/package-info.java
new file mode 100644
index 0000000..01c7eb0
--- /dev/null
+++ b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-api/src/main/java/org/apache/hadoop/yarn/util/resource/package-info.java
@@ -0,0 +1,22 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+@InterfaceAudience.Public
+@InterfaceStability.Unstable
+package org.apache.hadoop.yarn.util.resource;
+import org.apache.hadoop.classification.InterfaceAudience;
+import org.apache.hadoop.classification.InterfaceStability;
\ No newline at end of file
diff --git a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-common/src/main/java/org/apache/hadoop/yarn/api/records/impl/pb/ProtoUtils.java b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-common/src/main/java/org/apache/hadoop/yarn/api/records/impl/pb/ProtoUtils.java
index e8b0594..8176068 100644
--- a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-common/src/main/java/org/apache/hadoop/yarn/api/records/impl/pb/ProtoUtils.java
+++ b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-common/src/main/java/org/apache/hadoop/yarn/api/records/impl/pb/ProtoUtils.java
@@ -472,9 +472,8 @@ public class ProtoUtils {
       List<YarnProtos.StringLongMapProto> pList) {
     Resource tmp = Resource.newInstance(0, 0);
     Map<String, Long> ret = new HashMap<>();
-    for (Map.Entry<String, ResourceInformation> entry : tmp.getResources()
-        .entrySet()) {
-      ret.put(entry.getKey(), 0L);
+    for (ResourceInformation entry : tmp.getResources()) {
+      ret.put(entry.getName(), 0L);
     }
     if (pList != null) {
       for (YarnProtos.StringLongMapProto p : pList) {
diff --git a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-common/src/main/java/org/apache/hadoop/yarn/api/records/impl/pb/ResourcePBImpl.java b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-common/src/main/java/org/apache/hadoop/yarn/api/records/impl/pb/ResourcePBImpl.java
index 6e51efa..00be77a 100644
--- a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-common/src/main/java/org/apache/hadoop/yarn/api/records/impl/pb/ResourcePBImpl.java
+++ b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-common/src/main/java/org/apache/hadoop/yarn/api/records/impl/pb/ResourcePBImpl.java
@@ -25,6 +25,7 @@ import org.apache.hadoop.classification.InterfaceStability.Unstable;
 import org.apache.hadoop.yarn.api.protocolrecords.ResourceTypes;
 import org.apache.hadoop.yarn.api.records.Resource;
 import org.apache.hadoop.yarn.api.records.ResourceInformation;
+import org.apache.hadoop.yarn.api.records.impl.BaseResource;
 import org.apache.hadoop.yarn.exceptions.ResourceNotFoundException;
 import org.apache.hadoop.yarn.exceptions.YarnRuntimeException;
 import org.apache.hadoop.yarn.proto.YarnProtos.ResourceProto;
@@ -33,14 +34,13 @@ import org.apache.hadoop.yarn.proto.YarnProtos.ResourceInformationProto;
 import org.apache.hadoop.yarn.util.resource.ResourceUtils;
 import org.apache.hadoop.yarn.util.UnitsConversionUtil;
 
-import java.util.HashMap;
+import java.util.Arrays;
 import java.util.Map;
-import java.util.Collections;
 
 
 @Private
 @Unstable
-public class ResourcePBImpl extends Resource {
+public class ResourcePBImpl extends BaseResource {
 
   private static final Log LOG = LogFactory.getLog(ResourcePBImpl.class);
 
@@ -48,10 +48,6 @@ public class ResourcePBImpl extends Resource {
   ResourceProto.Builder builder = null;
   boolean viaProto = false;
 
-  private Map<String, ResourceInformation> resources;
-  private Map<String, ResourceInformation> readOnlyResources;
-
-
   // call via ProtoUtils.convertToProtoFormat(Resource)
   static ResourceProto getProto(Resource r) {
     final ResourcePBImpl pb;
@@ -72,8 +68,6 @@ public class ResourcePBImpl extends Resource {
   public ResourcePBImpl(ResourceProto proto) {
     this.proto = proto;
     viaProto = true;
-    this.readOnlyResources = null;
-    this.resources = null;
     initResources();
   }
 
@@ -101,11 +95,13 @@ public class ResourcePBImpl extends Resource {
   public long getMemorySize() {
     // memory should always be present
     initResources();
-    ResourceInformation ri =
-        this.getResourceInformation(ResourceInformation.MEMORY_MB.getName());
-    return UnitsConversionUtil
-        .convert(ri.getUnits(), ResourceInformation.MEMORY_MB.getUnits(),
-            ri.getValue());
+    ResourceInformation ri = resources[MandatoryResources.MEMORY.getId()];
+
+    if (ri.getUnits().isEmpty()) {
+      return ri.getValue();
+    }
+    return UnitsConversionUtil.convert(ri.getUnits(),
+        ResourceInformation.MEMORY_MB.getUnits(), ri.getValue());
   }
 
   @Override
@@ -117,23 +113,20 @@ public class ResourcePBImpl extends Resource {
   @Override
   public void setMemorySize(long memory) {
     maybeInitBuilder();
-    getResourceInformation(ResourceInformation.MEMORY_MB.getName())
-        .setValue(memory);
+    getResourceInformation(MEMORY).setValue(memory);
   }
 
   @Override
   public int getVirtualCores() {
     // vcores should always be present
     initResources();
-    return this.getResourceValue(ResourceInformation.VCORES.getName())
-        .intValue();
+    return (int) resources[MandatoryResources.VCORES.getId()].getValue();
   }
 
   @Override
   public void setVirtualCores(int vCores) {
     maybeInitBuilder();
-    getResourceInformation(ResourceInformation.VCORES.getName())
-        .setValue(vCores);
+    getResourceInformation(VCORES).setValue(vCores);
   }
 
   private void initResources() {
@@ -142,6 +135,7 @@ public class ResourcePBImpl extends Resource {
     }
     ResourceProtoOrBuilder p = viaProto ? proto : builder;
     initResourcesMap();
+    Map<String, Integer> indexMap = ResourceUtils.getResourceTypeIndex();
     for (ResourceInformationProto entry : p.getResourceValueMapList()) {
       ResourceTypes type =
           entry.hasType() ? ProtoUtils.convertFromProtoFormat(entry.getType()) :
@@ -150,14 +144,16 @@ public class ResourcePBImpl extends Resource {
       long value = entry.hasValue() ? entry.getValue() : 0L;
       ResourceInformation ri = ResourceInformation
           .newInstance(entry.getKey(), units, value, type, 0L, Long.MAX_VALUE);
-      if (resources.containsKey(ri.getName())) {
-        resources.get(ri.getName()).setResourceType(ri.getResourceType());
-        resources.get(ri.getName()).setUnits(ri.getUnits());
-        resources.get(ri.getName()).setValue(value);
-      } else {
+      Integer index = indexMap.get(entry.getKey());
+      if (index == null) {
         LOG.warn("Got unknown resource type: " + ri.getName() + "; skipping");
+      } else {
+        resources[index].setResourceType(ri.getResourceType());
+        resources[index].setUnits(ri.getUnits());
+        resources[index].setValue(value);
       }
     }
+    readOnlyResources = Arrays.copyOf(resources, resources.length);
     this.setMemorySize(p.getMemory());
     this.setVirtualCores(p.getVirtualCores());
   }
@@ -173,79 +169,67 @@ public class ResourcePBImpl extends Resource {
     if (!resource.equals(resourceInformation.getName())) {
       resourceInformation.setName(resource);
     }
-    initResources();
-    if (resources.containsKey(resource)) {
-      ResourceInformation.copy(resourceInformation, resources.get(resource));
-    }
+    ResourceInformation storedResourceInfo = getResourceInformation(resource);
+    ResourceInformation.copy(resourceInformation, storedResourceInfo);
   }
 
   @Override
   public void setResourceValue(String resource, Long value)
       throws ResourceNotFoundException {
     maybeInitBuilder();
-    initResources();
     if (resource == null) {
       throw new IllegalArgumentException("resource type object cannot be null");
     }
-    if (resources == null || (!resources.containsKey(resource))) {
-      throw new ResourceNotFoundException(
-          "Resource " + resource + " not found");
-    }
-    resources.get(resource).setValue(value);
+    getResourceInformation(resource).setValue(value);
   }
 
   @Override
-  public Map<String, ResourceInformation> getResources() {
+  public ResourceInformation[] getResources() {
     initResources();
-    return readOnlyResources;
+    return super.getResources();
   }
 
   @Override
-  public ResourceInformation getResourceInformation(String resource) {
+  public ResourceInformation getResourceInformation(String resource)
+      throws ResourceNotFoundException {
     initResources();
-    if (this.resources.containsKey(resource)) {
-      return this.resources.get(resource);
-    }
-    throw new ResourceNotFoundException("Could not find entry for " + resource);
+    return super.getResourceInformation(resource);
   }
 
   @Override
-  public Long getResourceValue(String resource) {
+  public long getResourceValue(String resource)
+      throws ResourceNotFoundException {
     initResources();
-    if (this.resources.containsKey(resource)) {
-      return this.resources.get(resource).getValue();
-    }
-    throw new ResourceNotFoundException("Could not find entry for " + resource);
+    return super.getResourceValue(resource);
   }
 
   private void initResourcesMap() {
     if (resources == null) {
-      resources = new HashMap<>();
-      Map<String, ResourceInformation> types = ResourceUtils.getResourceTypes();
+      ResourceInformation[] types = ResourceUtils.getResourceTypesArray();
       if (types == null) {
         throw new YarnRuntimeException(
             "Got null return value from ResourceUtils.getResourceTypes()");
       }
-      for (Map.Entry<String, ResourceInformation> entry : types.entrySet()) {
-        resources.put(entry.getKey(),
-            ResourceInformation.newInstance(entry.getValue()));
+
+      resources = new ResourceInformation[types.length];
+      readOnlyResources = new ResourceInformation[types.length];
+      for (ResourceInformation entry : types) {
+        int index = ResourceUtils.getResourceTypeIndex().get(entry.getName());
+        resources[index] = ResourceInformation.newInstance(entry);
       }
-      readOnlyResources = Collections.unmodifiableMap(resources);
     }
   }
 
   synchronized private void mergeLocalToBuilder() {
     builder.clearResourceValueMap();
-    if (resources != null && !resources.isEmpty()) {
-      for (Map.Entry<String, ResourceInformation> entry :
-          resources.entrySet()) {
-        ResourceInformationProto.Builder e =
-            ResourceInformationProto.newBuilder();
-        e.setKey(entry.getKey());
-        e.setUnits(entry.getValue().getUnits());
-        e.setType(
-            ProtoUtils.converToProtoFormat(entry.getValue().getResourceType()));
-        e.setValue(entry.getValue().getValue());
+    if(resources != null && resources.length != 0) {
+      for (ResourceInformation resInfo : resources) {
+        ResourceInformationProto.Builder e = ResourceInformationProto
+            .newBuilder();
+        e.setKey(resInfo.getName());
+        e.setUnits(resInfo.getUnits());
+        e.setType(ProtoUtils.converToProtoFormat(resInfo.getResourceType()));
+        e.setValue(resInfo.getValue());
         builder.addResourceValueMap(e);
       }
     }
diff --git a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-common/src/main/java/org/apache/hadoop/yarn/util/resource/DominantResourceCalculator.java b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-common/src/main/java/org/apache/hadoop/yarn/util/resource/DominantResourceCalculator.java
index 79bb03d..ea5c8a8 100644
--- a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-common/src/main/java/org/apache/hadoop/yarn/util/resource/DominantResourceCalculator.java
+++ b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-common/src/main/java/org/apache/hadoop/yarn/util/resource/DominantResourceCalculator.java
@@ -23,10 +23,9 @@ import org.apache.hadoop.classification.InterfaceAudience.Private;
 import org.apache.hadoop.classification.InterfaceStability.Unstable;
 import org.apache.hadoop.yarn.api.records.Resource;
 import org.apache.hadoop.yarn.api.records.ResourceInformation;
-import org.apache.hadoop.yarn.exceptions.YarnException;
+import org.apache.hadoop.yarn.exceptions.ResourceNotFoundException;
 import org.apache.hadoop.yarn.util.UnitsConversionUtil;
 
-import java.util.Set;
 
 /**
  * A {@link ResourceCalculator} which uses the concept of
@@ -56,10 +55,10 @@ public class DominantResourceCalculator extends ResourceCalculator {
       LogFactory.getLog(DominantResourceCalculator.class);
 
 
-  private Set<String> resourceNames;
+  private String[] resourceNames;
 
   public DominantResourceCalculator() {
-    resourceNames = ResourceUtils.getResourceTypes().keySet();
+    resourceNames = ResourceUtils.getResourceNamesArray();
   }
 
   /**
@@ -88,7 +87,7 @@ public class DominantResourceCalculator extends ResourceCalculator {
         } else if (diff <= -1) {
           rhsGreater = true;
         }
-      } catch (YarnException ye) {
+      } catch (ResourceNotFoundException ye) {
         throw new IllegalArgumentException(
             "Error getting resource information for " + rName, ye);
       }
@@ -163,7 +162,7 @@ public class DominantResourceCalculator extends ResourceCalculator {
                 .getValue();
         min = min < tmp ? min : tmp;
         max = max > tmp ? max : tmp;
-      } catch (YarnException ye) {
+      } catch (ResourceNotFoundException ye) {
         throw new IllegalArgumentException(
             "Error getting resource information for " + resource, ye);
       }
@@ -187,7 +186,7 @@ public class DominantResourceCalculator extends ResourceCalculator {
           long tmp = availableResource.getValue() / requiredResourceValue;
           min = min < tmp ? min : tmp;
         }
-      } catch (YarnException ye) {
+      } catch (ResourceNotFoundException ye) {
         throw new IllegalArgumentException(
             "Error getting resource information for " + resource, ye);
       }
@@ -206,14 +205,9 @@ public class DominantResourceCalculator extends ResourceCalculator {
 
   @Override
   public boolean isInvalidDivisor(Resource r) {
-    for (String resource : resourceNames) {
-      try {
-        if (r.getResourceValue(resource).equals(0L)) {
-          return true;
-        }
-      } catch (YarnException ye) {
-        throw new IllegalArgumentException(
-            "Error getting resource value for " + resource, ye);
+    for (ResourceInformation res : r.getResources()) {
+      if (res.getValue() == 0L) {
+        return true;
       }
     }
     return false;
@@ -235,7 +229,7 @@ public class DominantResourceCalculator extends ResourceCalculator {
         float tmp =
             (float) aResourceInformation.getValue() / (float) bResourceValue;
         ratio = ratio > tmp ? ratio : tmp;
-      } catch (YarnException ye) {
+      } catch (ResourceNotFoundException ye) {
         throw new IllegalArgumentException(
             "Error getting resource information for " + resource, ye);
       }
@@ -256,7 +250,7 @@ public class DominantResourceCalculator extends ResourceCalculator {
             ret.getResourceInformation(resource);
         resourceInformation.setValue(
             divideAndCeil(resourceInformation.getValue(), denominator));
-      } catch (YarnException ye) {
+      } catch (ResourceNotFoundException ye) {
         throw new IllegalArgumentException(
             "Error getting resource information for " + resource, ye);
       }
@@ -307,7 +301,7 @@ public class DominantResourceCalculator extends ResourceCalculator {
         }
         tmp.setValue(Math.min(value, maximumValue));
         ret.setResourceInformation(resource, tmp);
-      } catch (YarnException ye) {
+      } catch (ResourceNotFoundException ye) {
         throw new IllegalArgumentException(
             "Error getting resource information for " + resource, ye);
       }
@@ -347,7 +341,7 @@ public class DominantResourceCalculator extends ResourceCalculator {
         ResourceInformation
             .copy(rResourceInformation, ret.getResourceInformation(resource));
         ret.getResourceInformation(resource).setValue(value);
-      } catch (YarnException ye) {
+      } catch (ResourceNotFoundException ye) {
         throw new IllegalArgumentException(
             "Error getting resource information for " + resource, ye);
       }
@@ -372,28 +366,29 @@ public class DominantResourceCalculator extends ResourceCalculator {
     Resource ret = Resource.newInstance(r);
     for (String resource : resourceNames) {
       try {
-        ResourceInformation rResourceInformation =
-            r.getResourceInformation(resource);
-        ResourceInformation stepFactorResourceInformation =
-            stepFactor.getResourceInformation(resource);
+        ResourceInformation rResourceInformation = r
+            .getResourceInformation(resource);
+        ResourceInformation stepFactorResourceInformation = stepFactor
+            .getResourceInformation(resource);
         ResourceInformation tmp = ret.getResourceInformation(resource);
 
-        Long rValue = rResourceInformation.getValue();
-        Long stepFactorValue = UnitsConversionUtil
-            .convert(stepFactorResourceInformation.getUnits(),
-                rResourceInformation.getUnits(),
-                stepFactorResourceInformation.getValue());
-        Long value;
+        long rValue = rResourceInformation.getValue();
+        long stepFactorValue = UnitsConversionUtil.convert(
+            stepFactorResourceInformation.getUnits(),
+            rResourceInformation.getUnits(),
+            stepFactorResourceInformation.getValue());
+        long value;
         if (stepFactorValue != 0) {
-          value = roundUp ?
-              roundUp((long) Math.ceil(rValue * by), stepFactorValue) :
-              roundDown((long) (rValue * by), stepFactorValue);
+          value = roundUp
+              ? roundUp((long) Math.ceil(rValue * by), stepFactorValue)
+              : roundDown((long) (rValue * by), stepFactorValue);
         } else {
-          value =
-              roundUp ? (long) Math.ceil(rValue * by) : (long) (rValue * by);
+          value = roundUp
+              ? (long) Math.ceil(rValue * by)
+              : (long) (rValue * by);
         }
         tmp.setValue(value);
-      } catch (YarnException ye) {
+      } catch (ResourceNotFoundException ye) {
         throw new IllegalArgumentException(
             "Error getting resource information for " + resource, ye);
       }
@@ -416,7 +411,7 @@ public class DominantResourceCalculator extends ResourceCalculator {
         if(sResourceValue > bResourceInformation.getValue()) {
           return false;
         }
-      } catch (YarnException ye) {
+      } catch (ResourceNotFoundException ye) {
         return false;
       }
     }
diff --git a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-common/src/main/java/org/apache/hadoop/yarn/util/resource/Resources.java b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-common/src/main/java/org/apache/hadoop/yarn/util/resource/Resources.java
index d143e93..f62114d 100644
--- a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-common/src/main/java/org/apache/hadoop/yarn/util/resource/Resources.java
+++ b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-common/src/main/java/org/apache/hadoop/yarn/util/resource/Resources.java
@@ -18,30 +18,31 @@
 
 package org.apache.hadoop.yarn.util.resource;
 
+import org.apache.commons.logging.Log;
+import org.apache.commons.logging.LogFactory;
 import org.apache.hadoop.classification.InterfaceAudience;
 import org.apache.hadoop.classification.InterfaceStability.Unstable;
 import org.apache.hadoop.yarn.api.records.Resource;
 import org.apache.hadoop.yarn.api.records.ResourceInformation;
+import org.apache.hadoop.yarn.api.records.impl.BaseResource;
 import org.apache.hadoop.yarn.exceptions.ResourceNotFoundException;
-import org.apache.hadoop.yarn.exceptions.YarnException;
-import org.apache.hadoop.yarn.util.Records;
 import org.apache.hadoop.yarn.util.UnitsConversionUtil;
 
-import java.util.Collections;
-import java.util.HashMap;
-import java.util.Map;
+import java.util.Arrays;
 
 @InterfaceAudience.LimitedPrivate({ "YARN", "MapReduce" })
 @Unstable
 public class Resources {
 
+  private static final Log LOG =
+      LogFactory.getLog(Resources.class);
+
   /**
    * Helper class to create a resource with a fixed value for all resource
    * types. For example, a NONE resource which returns 0 for any resource type.
    */
-  static class FixedValueResource extends Resource {
+  static class FixedValueResource extends BaseResource {
 
-    private Map<String, ResourceInformation> resources;
     private long resourceValue;
     private String name;
 
@@ -53,7 +54,7 @@ public class Resources {
     FixedValueResource(String rName, long value) {
       this.resourceValue = value;
       this.name = rName;
-      resources = initResourceMap();
+      initResourceMap();
     }
 
     private int resourceValueToInt() {
@@ -96,31 +97,6 @@ public class Resources {
     }
 
     @Override
-    public Map<String, ResourceInformation> getResources() {
-      return Collections.unmodifiableMap(this.resources);
-    }
-
-    @Override
-    public ResourceInformation getResourceInformation(String resource)
-        throws YarnException {
-      if (resources.containsKey(resource)) {
-        ResourceInformation value = this.resources.get(resource);
-        ResourceInformation ret = ResourceInformation.newInstance(value);
-        ret.setValue(resourceValue);
-        return ret;
-      }
-      throw new YarnException("" + resource + " not found");
-    }
-
-    @Override
-    public Long getResourceValue(String resource) throws YarnException {
-      if (resources.containsKey(resource)) {
-        return resourceValue;
-      }
-      throw new YarnException("" + resource + " not found");
-    }
-
-    @Override
     public void setResourceInformation(String resource,
         ResourceInformation resourceInformation)
         throws ResourceNotFoundException {
@@ -133,24 +109,24 @@ public class Resources {
       throw new RuntimeException(name + " cannot be modified!");
     }
 
-    private Map<String, ResourceInformation> initResourceMap() {
-      Map<String, ResourceInformation> tmp = new HashMap<>();
-      Map<String, ResourceInformation> types = ResourceUtils.getResourceTypes();
+    private void initResourceMap() {
+      ResourceInformation[] types = ResourceUtils.getResourceTypesArray();
       if (types != null) {
-        for (Map.Entry<String, ResourceInformation> entry : types.entrySet()) {
-          tmp.put(entry.getKey(),
-              ResourceInformation.newInstance(entry.getValue()));
-          tmp.get(entry.getKey()).setValue(resourceValue);
+        resources = new ResourceInformation[types.length];
+        readOnlyResources = new ResourceInformation[types.length];
+        for (int index = 0; index < types.length; index++) {
+          resources[index] = ResourceInformation.newInstance(types[index]);
+          resources[index].setValue(resourceValue);
+
+          // this is a fix for getVirtualCores returning an int
+          if (resourceValue > Integer.MAX_VALUE && ResourceInformation.VCORES
+              .getName().equals(resources[index].getName())) {
+            resources[index].setValue((long) Integer.MAX_VALUE);
+          }
         }
       }
-      // this is a fix for getVirtualCores returning an int
-      if (resourceValue > Integer.MAX_VALUE) {
-        tmp.get(ResourceInformation.VCORES.getName())
-            .setValue((long) Integer.MAX_VALUE);
-      }
-      return tmp;
+      readOnlyResources = Arrays.copyOf(resources, resources.length);
     }
-
   }
 
   public static Resource createResource(int memory) {
@@ -197,17 +173,19 @@ public class Resources {
   }
 
   public static Resource addTo(Resource lhs, Resource rhs) {
-    for (Map.Entry<String, ResourceInformation> entry : lhs.getResources()
-        .entrySet()) {
-      String name = entry.getKey();
+    for (ResourceInformation entry : lhs.getResources()) {
+      String name = entry.getName();
       try {
         ResourceInformation rhsValue = rhs.getResourceInformation(name);
-        ResourceInformation lhsValue = entry.getValue();
-        long convertedRhs = UnitsConversionUtil
-            .convert(rhsValue.getUnits(), lhsValue.getUnits(),
-                rhsValue.getValue());
+        ResourceInformation lhsValue = entry;
+
+        long convertedRhs = (rhsValue.getUnits().equals(lhsValue.getUnits()))
+            ? rhsValue.getValue()
+            : UnitsConversionUtil.convert(rhsValue.getUnits(),
+                lhsValue.getUnits(), rhsValue.getValue());
         lhs.setResourceValue(name, lhsValue.getValue() + convertedRhs);
-      } catch (YarnException ye) {
+      } catch (ResourceNotFoundException ye) {
+        LOG.warn("Resource is missing:" + ye.getMessage());
         continue;
       }
     }
@@ -219,17 +197,19 @@ public class Resources {
   }
 
   public static Resource subtractFrom(Resource lhs, Resource rhs) {
-    for (Map.Entry<String, ResourceInformation> entry : lhs.getResources()
-        .entrySet()) {
-      String name = entry.getKey();
+    for (ResourceInformation entry : lhs.getResources()) {
+      String name = entry.getName();
       try {
         ResourceInformation rhsValue = rhs.getResourceInformation(name);
-        ResourceInformation lhsValue = entry.getValue();
-        long convertedRhs = UnitsConversionUtil
-            .convert(rhsValue.getUnits(), lhsValue.getUnits(),
-                rhsValue.getValue());
+        ResourceInformation lhsValue = entry;
+
+        long convertedRhs = (rhsValue.getUnits().equals(lhsValue.getUnits()))
+            ? rhsValue.getValue()
+            : UnitsConversionUtil.convert(rhsValue.getUnits(),
+                lhsValue.getUnits(), rhsValue.getValue());
         lhs.setResourceValue(name, lhsValue.getValue() - convertedRhs);
-      } catch (YarnException ye) {
+      } catch (ResourceNotFoundException ye) {
+        LOG.warn("Resource is missing:" + ye.getMessage());
         continue;
       }
     }
@@ -263,10 +243,9 @@ public class Resources {
   }
 
   public static Resource multiplyTo(Resource lhs, double by) {
-    for (Map.Entry<String, ResourceInformation> entry : lhs.getResources()
-        .entrySet()) {
-      String name = entry.getKey();
-      ResourceInformation lhsValue = entry.getValue();
+    for (ResourceInformation entry : lhs.getResources()) {
+      String name = entry.getName();
+      ResourceInformation lhsValue = entry;
       lhs.setResourceValue(name, (long) (lhsValue.getValue() * by));
     }
     return lhs;
@@ -282,17 +261,21 @@ public class Resources {
    */
   public static Resource multiplyAndAddTo(
       Resource lhs, Resource rhs, double by) {
-    for (Map.Entry<String, ResourceInformation> entry : lhs.getResources()
-        .entrySet()) {
-      String name = entry.getKey();
+    for (ResourceInformation entry : lhs.getResources()) {
+      String name = entry.getName();
       try {
         ResourceInformation rhsValue = rhs.getResourceInformation(name);
-        ResourceInformation lhsValue = entry.getValue();
-        long convertedRhs = (long) (UnitsConversionUtil
-            .convert(rhsValue.getUnits(), lhsValue.getUnits(),
-                rhsValue.getValue()) * by);
+        ResourceInformation lhsValue = entry;
+
+        long convertedRhs = (long) (((rhsValue.getUnits()
+            .equals(lhsValue.getUnits()))
+                ? rhsValue.getValue()
+                : UnitsConversionUtil.convert(rhsValue.getUnits(),
+                    lhsValue.getUnits(), rhsValue.getValue()))
+            * by);
         lhs.setResourceValue(name, lhsValue.getValue() + convertedRhs);
-      } catch (YarnException ye) {
+      } catch (ResourceNotFoundException ye) {
+        LOG.warn("Resource is missing:" + ye.getMessage());
         continue;
       }
     }
@@ -311,10 +294,9 @@ public class Resources {
   
   public static Resource multiplyAndRoundDown(Resource lhs, double by) {
     Resource out = clone(lhs);
-    for (Map.Entry<String, ResourceInformation> entry : out.getResources()
-        .entrySet()) {
-      String name = entry.getKey();
-      ResourceInformation lhsValue = entry.getValue();
+    for (ResourceInformation entry : out.getResources()) {
+      String name = entry.getName();
+      ResourceInformation lhsValue = entry;
       out.setResourceValue(name, (long) (lhsValue.getValue() * by));
     }
     return out;
@@ -416,19 +398,21 @@ public class Resources {
   }
   
   public static boolean fitsIn(Resource smaller, Resource bigger) {
-    for (Map.Entry<String, ResourceInformation> entry : smaller.getResources()
-        .entrySet()) {
-      String name = entry.getKey();
+    for (ResourceInformation entry : smaller.getResources()) {
+      String name = entry.getName();
       try {
         ResourceInformation rhsValue = bigger.getResourceInformation(name);
-        ResourceInformation lhsValue = entry.getValue();
-        long convertedRhs = UnitsConversionUtil
-            .convert(rhsValue.getUnits(), lhsValue.getUnits(),
-                rhsValue.getValue());
+        ResourceInformation lhsValue = entry;
+
+        long convertedRhs = (rhsValue.getUnits().equals(lhsValue.getUnits()))
+            ? rhsValue.getValue()
+            : UnitsConversionUtil.convert(rhsValue.getUnits(),
+                lhsValue.getUnits(), rhsValue.getValue());
         if(lhsValue.getValue() > convertedRhs) {
           return false;
         }
-      } catch (YarnException ye) {
+      } catch (ResourceNotFoundException ye) {
+        LOG.warn("Resource is missing:" + ye.getMessage());
         return false;
       }
     }
@@ -442,19 +426,21 @@ public class Resources {
   
   public static Resource componentwiseMin(Resource lhs, Resource rhs) {
     Resource ret = createResource(0);
-    for (Map.Entry<String, ResourceInformation> entry : lhs.getResources()
-        .entrySet()) {
-      String name = entry.getKey();
+    for (ResourceInformation entry : lhs.getResources()) {
+      String name = entry.getName();
       try {
         ResourceInformation rhsValue = rhs.getResourceInformation(name);
-        ResourceInformation lhsValue = entry.getValue();
-        long convertedRhs = UnitsConversionUtil
-            .convert(rhsValue.getUnits(), lhsValue.getUnits(),
-                rhsValue.getValue());
+        ResourceInformation lhsValue = entry;
+
+        long convertedRhs = (rhsValue.getUnits().equals(lhsValue.getUnits()))
+            ? rhsValue.getValue()
+            : UnitsConversionUtil.convert(rhsValue.getUnits(),
+                lhsValue.getUnits(), rhsValue.getValue());
         ResourceInformation outInfo =
             lhsValue.getValue() < convertedRhs ? lhsValue : rhsValue;
         ret.setResourceInformation(name, outInfo);
-      } catch (YarnException ye) {
+      } catch (ResourceNotFoundException ye) {
+        LOG.warn("Resource is missing:" + ye.getMessage());
         continue;
       }
     }
@@ -463,19 +449,21 @@ public class Resources {
   
   public static Resource componentwiseMax(Resource lhs, Resource rhs) {
     Resource ret = createResource(0);
-    for (Map.Entry<String, ResourceInformation> entry : lhs.getResources()
-        .entrySet()) {
-      String name = entry.getKey();
+    for (ResourceInformation entry : lhs.getResources()) {
+      String name = entry.getName();
       try {
         ResourceInformation rhsValue = rhs.getResourceInformation(name);
-        ResourceInformation lhsValue = entry.getValue();
-        long convertedRhs = UnitsConversionUtil
-            .convert(rhsValue.getUnits(), lhsValue.getUnits(),
-                rhsValue.getValue());
+        ResourceInformation lhsValue = entry;
+
+        long convertedRhs = (rhsValue.getUnits().equals(lhsValue.getUnits()))
+            ? rhsValue.getValue()
+            : UnitsConversionUtil.convert(rhsValue.getUnits(),
+                lhsValue.getUnits(), rhsValue.getValue());
         ResourceInformation outInfo =
             lhsValue.getValue() > convertedRhs ? lhsValue : rhsValue;
         ret.setResourceInformation(name, outInfo);
-      } catch (YarnException ye) {
+      } catch (ResourceNotFoundException ye) {
+        LOG.warn("Resource is missing:" + ye.getMessage());
         continue;
       }
     }
diff --git a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-common/src/test/java/org/apache/hadoop/yarn/util/resource/TestResourceUtils.java b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-common/src/test/java/org/apache/hadoop/yarn/util/resource/TestResourceUtils.java
index 38554b6..b530150 100644
--- a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-common/src/test/java/org/apache/hadoop/yarn/util/resource/TestResourceUtils.java
+++ b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-common/src/test/java/org/apache/hadoop/yarn/util/resource/TestResourceUtils.java
@@ -276,13 +276,17 @@ public class TestResourceUtils {
       String resourceFile = entry.getKey();
       ResourceUtils.resetNodeResources();
       File dest;
-      File source =
-          new File(conf.getClassLoader().getResource(resourceFile).getFile());
+      File source = new File(
+          conf.getClassLoader().getResource(resourceFile).getFile());
       dest = new File(source.getParent(), "node-resources.xml");
       FileUtils.copyFile(source, dest);
-      Map<String, ResourceInformation> actual =
-          ResourceUtils.getNodeResourceInformation(conf);
-      Assert.assertEquals(entry.getValue().getResources(), actual);
+      Map<String, ResourceInformation> actual = ResourceUtils
+          .getNodeResourceInformation(conf);
+      Assert.assertEquals(actual.size(),
+          entry.getValue().getResources().length);
+      for (ResourceInformation resInfo : entry.getValue().getResources()) {
+        Assert.assertEquals(resInfo, actual.get(resInfo.getName()));
+      }
       dest.delete();
     }
   }
diff --git a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-common/src/test/java/org/apache/hadoop/yarn/util/resource/TestResources.java b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-common/src/test/java/org/apache/hadoop/yarn/util/resource/TestResources.java
index 1555e55..a8404fb 100644
--- a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-common/src/test/java/org/apache/hadoop/yarn/util/resource/TestResources.java
+++ b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-common/src/test/java/org/apache/hadoop/yarn/util/resource/TestResources.java
@@ -105,7 +105,7 @@ public class TestResources {
         unboundedClone.compareTo(createResource(0, Integer.MAX_VALUE)) > 0);
   }
 
-  @Test(timeout=10000)
+  @Test(timeout = 10000)
   public void testCompareToWithNoneResource() {
     assertTrue(Resources.none().compareTo(createResource(0, 0)) == 0);
     assertTrue(Resources.none().compareTo(createResource(1, 0)) < 0);
@@ -114,7 +114,6 @@ public class TestResources {
     assertTrue(Resources.none().compareTo(createResource(1, 0, 0)) < 0);
     assertTrue(Resources.none().compareTo(createResource(0, 1, 0)) < 0);
     assertTrue(Resources.none().compareTo(createResource(0, 0, 1)) < 0);
-    assertTrue(Resources.none().compareTo(createResource(0, 0, 1)) < 0);
   }
 
   @Test(timeout=10000)
@@ -246,7 +245,9 @@ public class TestResources {
   }
 
   @Test
-  public void testMultiplyAndAddTo() {
+  public void testMultiplyAndAddTo() throws Exception {
+    unsetExtraResourceType();
+    setupExtraResourceType();
     assertEquals(createResource(6, 4),
         multiplyAndAddTo(createResource(3, 1), createResource(2, 2), 1.5));
     assertEquals(createResource(6, 4, 0),
diff --git a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/rmapp/attempt/RMAppAttemptMetrics.java b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/rmapp/attempt/RMAppAttemptMetrics.java
index 8ef6d99..0982ef9 100644
--- a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/rmapp/attempt/RMAppAttemptMetrics.java
+++ b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/rmapp/attempt/RMAppAttemptMetrics.java
@@ -178,16 +178,15 @@ public class RMAppAttemptMetrics {
 
   private void updateUsageMap(Resource allocated, long deltaUsedMillis,
       Map<String, AtomicLong> targetMap) {
-    for (Map.Entry<String, ResourceInformation> entry : allocated.getResources()
-        .entrySet()) {
+    for (ResourceInformation entry : allocated.getResources()) {
       AtomicLong resourceUsed;
-      if (!targetMap.containsKey(entry.getKey())) {
+      if (!targetMap.containsKey(entry.getName())) {
         resourceUsed = new AtomicLong(0);
-        targetMap.put(entry.getKey(), resourceUsed);
+        targetMap.put(entry.getName(), resourceUsed);
 
       }
-      resourceUsed = targetMap.get(entry.getKey());
-      resourceUsed.addAndGet((entry.getValue().getValue() * deltaUsedMillis)
+      resourceUsed = targetMap.get(entry.getName());
+      resourceUsed.addAndGet((entry.getValue() * deltaUsedMillis)
           / DateUtils.MILLIS_PER_SECOND);
     }
   }
diff --git a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/scheduler/SchedulerApplicationAttempt.java b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/scheduler/SchedulerApplicationAttempt.java
index 1785dfb..1e1f327 100644
--- a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/scheduler/SchedulerApplicationAttempt.java
+++ b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/scheduler/SchedulerApplicationAttempt.java
@@ -1006,13 +1006,12 @@ public class SchedulerApplicationAttempt implements SchedulableEntity {
       for (RMContainer rmContainer : this.liveContainers.values()) {
         long usedMillis = currentTimeMillis - rmContainer.getCreationTime();
         Resource resource = rmContainer.getContainer().getResource();
-        for (Map.Entry<String, ResourceInformation> entry : resource
-            .getResources().entrySet()) {
+        for (ResourceInformation entry : resource.getResources()) {
           long value = RMServerUtils
-              .getOrDefault(resourceSecondsMap, entry.getKey(), 0L);
-          value += entry.getValue().getValue() * usedMillis
+              .getOrDefault(resourceSecondsMap, entry.getName(), 0L);
+          value += entry.getValue() * usedMillis
               / DateUtils.MILLIS_PER_SECOND;
-          resourceSecondsMap.put(entry.getKey(), value);
+          resourceSecondsMap.put(entry.getName(), value);
         }
       }
 
diff --git a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/webapp/dao/SchedulerInfo.java b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/webapp/dao/SchedulerInfo.java
index 887b854..81491b1 100644
--- a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/webapp/dao/SchedulerInfo.java
+++ b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/webapp/dao/SchedulerInfo.java
@@ -18,6 +18,7 @@
 
 package org.apache.hadoop.yarn.server.resourcemanager.webapp.dao;
 
+import java.util.Arrays;
 import java.util.EnumSet;
 
 import javax.xml.bind.annotation.XmlRootElement;
@@ -73,7 +74,7 @@ public class SchedulerInfo {
   }
 
   public String getSchedulerResourceTypes() {
-    return minAllocResource.getResource().getResources().keySet().toString();
+    return Arrays.toString(minAllocResource.getResource().getResources());
   }
 
   public int getMaxClusterLevelAppPriority() {
diff --git a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/test/java/org/apache/hadoop/yarn/server/resourcemanager/TestAppManager.java b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/test/java/org/apache/hadoop/yarn/server/resourcemanager/TestAppManager.java
index 3a959b5..72803f1 100644
--- a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/test/java/org/apache/hadoop/yarn/server/resourcemanager/TestAppManager.java
+++ b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/test/java/org/apache/hadoop/yarn/server/resourcemanager/TestAppManager.java
@@ -249,6 +249,7 @@ public class TestAppManager{
     ResourceScheduler scheduler = mockResourceScheduler();
     ((RMContextImpl)rmContext).setScheduler(scheduler);
     Configuration conf = new Configuration();
+    conf.setBoolean(YarnConfiguration.NODE_LABELS_ENABLED, true);
     ((RMContextImpl) rmContext).setYarnConfiguration(conf);
     ApplicationMasterService masterService =
         new ApplicationMasterService(rmContext, scheduler);


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