From edcecedc1c39d54db0f86a1325b4db26c38d2d4d Mon Sep 17 00:00:00 2001
From: Wangda Tan <wangda@apache.org>
Date: Fri, 27 Feb 2015 16:13:32 -0800
Subject: [PATCH] YARN-3262. Surface application outstanding resource requests
 table in RM web UI. (Jian He via wangda)

---
 hadoop-yarn-project/CHANGES.txt               |  3 ++
 .../impl/pb/ResourceRequestPBImpl.java        |  4 +-
 .../scheduler/AbstractYarnScheduler.java      |  9 ++++
 .../scheduler/AppSchedulingInfo.java          | 33 ++++++-------
 .../SchedulerApplicationAttempt.java          |  6 ++-
 .../resourcemanager/webapp/AppBlock.java      | 46 ++++++++++++++++++-
 .../resourcemanager/webapp/AppPage.java       |  4 ++
 .../resourcemanager/webapp/AppsBlock.java     |  5 +-
 .../webapp/FairSchedulerAppsBlock.java        |  5 +-
 .../resourcemanager/webapp/RMWebServices.java |  6 +--
 .../resourcemanager/webapp/dao/AppInfo.java   | 17 ++++++-
 .../webapp/TestRMWebAppFairScheduler.java     | 10 +++-
 .../webapp/TestRMWebServicesApps.java         |  3 +-
 13 files changed, 118 insertions(+), 33 deletions(-)

diff --git a/hadoop-yarn-project/CHANGES.txt b/hadoop-yarn-project/CHANGES.txt
index 38dd9fa2363..e7af84bd71f 100644
--- a/hadoop-yarn-project/CHANGES.txt
+++ b/hadoop-yarn-project/CHANGES.txt
@@ -336,6 +336,9 @@ Release 2.7.0 - UNRELEASED
     YARN-2820. Retry in FileSystemRMStateStore when FS's operations fail 
     due to IOException. (Zhihai Xu via ozawa)
 
+    YARN-3262. Surface application outstanding resource requests table 
+    in RM web UI. (Jian He via wangda)
+
   OPTIMIZATIONS
 
     YARN-2990. FairScheduler's delay-scheduling always waits for node-local and 
diff --git a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-common/src/main/java/org/apache/hadoop/yarn/api/records/impl/pb/ResourceRequestPBImpl.java b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-common/src/main/java/org/apache/hadoop/yarn/api/records/impl/pb/ResourceRequestPBImpl.java
index 0c8491fc29a..27fb5ae40c3 100644
--- a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-common/src/main/java/org/apache/hadoop/yarn/api/records/impl/pb/ResourceRequestPBImpl.java
+++ b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-common/src/main/java/org/apache/hadoop/yarn/api/records/impl/pb/ResourceRequestPBImpl.java
@@ -140,13 +140,13 @@ public class ResourceRequestPBImpl extends  ResourceRequest {
     this.capability = capability;
   }
   @Override
-  public int getNumContainers() {
+  public synchronized int getNumContainers() {
     ResourceRequestProtoOrBuilder p = viaProto ? proto : builder;
     return (p.getNumContainers());
   }
 
   @Override
-  public void setNumContainers(int numContainers) {
+  public synchronized void setNumContainers(int numContainers) {
     maybeInitBuilder();
     builder.setNumContainers((numContainers));
   }
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/AbstractYarnScheduler.java b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/scheduler/AbstractYarnScheduler.java
index 04b3452fe39..968a767f517 100644
--- a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/scheduler/AbstractYarnScheduler.java
+++ b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/scheduler/AbstractYarnScheduler.java
@@ -658,4 +658,13 @@ public abstract class AbstractYarnScheduler
       maxAllocWriteLock.unlock();
     }
   }
+
+  public List<ResourceRequest> getPendingResourceRequestsForAttempt(
+      ApplicationAttemptId attemptId) {
+    SchedulerApplicationAttempt attempt = getApplicationAttempt(attemptId);
+    if (attempt != null) {
+      return attempt.getAppSchedulingInfo().getAllResourceRequests();
+    }
+    return null;
+  }
 }
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/AppSchedulingInfo.java b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/scheduler/AppSchedulingInfo.java
index a9a459f95e0..97dc231815d 100644
--- a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/scheduler/AppSchedulingInfo.java
+++ b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/scheduler/AppSchedulingInfo.java
@@ -20,12 +20,14 @@ package org.apache.hadoop.yarn.server.resourcemanager.scheduler;
 
 import java.util.ArrayList;
 import java.util.Collection;
+import java.util.Collections;
 import java.util.HashMap;
 import java.util.HashSet;
 import java.util.List;
 import java.util.Map;
 import java.util.Set;
 import java.util.TreeSet;
+import java.util.concurrent.ConcurrentHashMap;
 import java.util.concurrent.atomic.AtomicLong;
 
 import org.apache.commons.logging.Log;
@@ -64,7 +66,7 @@ public class AppSchedulingInfo {
   final Set<Priority> priorities = new TreeSet<Priority>(
       new org.apache.hadoop.yarn.server.resourcemanager.resource.Priority.Comparator());
   final Map<Priority, Map<String, ResourceRequest>> requests =
-    new HashMap<Priority, Map<String, ResourceRequest>>();
+    new ConcurrentHashMap<Priority, Map<String, ResourceRequest>>();
   private Set<String> blacklist = new HashSet<String>();
 
   //private final ApplicationStore store;
@@ -159,7 +161,7 @@ public class AppSchedulingInfo {
       Map<String, ResourceRequest> asks = this.requests.get(priority);
 
       if (asks == null) {
-        asks = new HashMap<String, ResourceRequest>();
+        asks = new ConcurrentHashMap<String, ResourceRequest>();
         this.requests.put(priority, asks);
         this.priorities.add(priority);
       }
@@ -221,7 +223,7 @@ public class AppSchedulingInfo {
     return requests.get(priority);
   }
 
-  synchronized public List<ResourceRequest> getAllResourceRequests() {
+  public List<ResourceRequest> getAllResourceRequests() {
     List<ResourceRequest> ret = new ArrayList<ResourceRequest>();
     for (Map<String, ResourceRequest> r : requests.values()) {
       ret.addAll(r.values());
@@ -300,17 +302,11 @@ public class AppSchedulingInfo {
       Priority priority, ResourceRequest nodeLocalRequest, Container container,
       List<ResourceRequest> resourceRequests) {
     // Update future requirements
-    nodeLocalRequest.setNumContainers(nodeLocalRequest.getNumContainers() - 1);
-    if (nodeLocalRequest.getNumContainers() == 0) {
-      this.requests.get(priority).remove(node.getNodeName());
-    }
+    decResourceRequest(node.getNodeName(), priority, nodeLocalRequest);
 
     ResourceRequest rackLocalRequest = requests.get(priority).get(
         node.getRackName());
-    rackLocalRequest.setNumContainers(rackLocalRequest.getNumContainers() - 1);
-    if (rackLocalRequest.getNumContainers() == 0) {
-      this.requests.get(priority).remove(node.getRackName());
-    }
+    decResourceRequest(node.getRackName(), priority, rackLocalRequest);
 
     ResourceRequest offRackRequest = requests.get(priority).get(
         ResourceRequest.ANY);
@@ -322,6 +318,14 @@ public class AppSchedulingInfo {
     resourceRequests.add(cloneResourceRequest(offRackRequest));
   }
 
+  private void decResourceRequest(String resourceName, Priority priority,
+      ResourceRequest request) {
+    request.setNumContainers(request.getNumContainers() - 1);
+    if (request.getNumContainers() == 0) {
+      requests.get(priority).remove(resourceName);
+    }
+  }
+
   /**
    * The {@link ResourceScheduler} is allocating data-local resources to the
    * application.
@@ -333,11 +337,8 @@ public class AppSchedulingInfo {
       Priority priority, ResourceRequest rackLocalRequest, Container container,
       List<ResourceRequest> resourceRequests) {
     // Update future requirements
-    rackLocalRequest.setNumContainers(rackLocalRequest.getNumContainers() - 1);
-    if (rackLocalRequest.getNumContainers() == 0) {
-      this.requests.get(priority).remove(node.getRackName());
-    }
-
+    decResourceRequest(node.getRackName(), priority, rackLocalRequest);
+    
     ResourceRequest offRackRequest = requests.get(priority).get(
         ResourceRequest.ANY);
     decrementOutstanding(offRackRequest);
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 d5b6ce66987..532df05d592 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
@@ -153,7 +153,11 @@ public class SchedulerApplicationAttempt {
   public synchronized Collection<RMContainer> getLiveContainers() {
     return new ArrayList<RMContainer>(liveContainers.values());
   }
-  
+
+  public AppSchedulingInfo getAppSchedulingInfo() {
+    return this.appSchedulingInfo;
+  }
+
   /**
    * Is this application pending?
    * @return true if it is else false.
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/AppBlock.java b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/webapp/AppBlock.java
index c2b376e8309..62ad8dfce44 100644
--- a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/webapp/AppBlock.java
+++ b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/webapp/AppBlock.java
@@ -35,6 +35,7 @@ import org.apache.hadoop.yarn.api.records.ApplicationId;
 import org.apache.hadoop.yarn.api.records.FinalApplicationStatus;
 import org.apache.hadoop.yarn.api.records.QueueACL;
 import org.apache.hadoop.yarn.api.records.Resource;
+import org.apache.hadoop.yarn.api.records.ResourceRequest;
 import org.apache.hadoop.yarn.api.records.YarnApplicationState;
 import org.apache.hadoop.yarn.server.resourcemanager.RMContext;
 import org.apache.hadoop.yarn.server.resourcemanager.ResourceManager;
@@ -50,6 +51,7 @@ import org.apache.hadoop.yarn.util.resource.Resources;
 import org.apache.hadoop.yarn.webapp.hamlet.Hamlet;
 import org.apache.hadoop.yarn.webapp.hamlet.Hamlet.DIV;
 import org.apache.hadoop.yarn.webapp.hamlet.Hamlet.TABLE;
+import org.apache.hadoop.yarn.webapp.hamlet.Hamlet.TBODY;
 import org.apache.hadoop.yarn.webapp.util.WebAppUtils;
 import org.apache.hadoop.yarn.webapp.view.HtmlBlock;
 import org.apache.hadoop.yarn.webapp.view.InfoBlock;
@@ -90,7 +92,8 @@ public class AppBlock extends HtmlBlock {
       puts("Application not found: "+ aid);
       return;
     }
-    AppInfo app = new AppInfo(rmApp, true, WebAppUtils.getHttpSchemePrefix(conf));
+    AppInfo app =
+        new AppInfo(rm, rmApp, true, WebAppUtils.getHttpSchemePrefix(conf));
 
     // Check for the authorization.
     String remoteUser = request().getRemoteUser();
@@ -134,7 +137,7 @@ public class AppBlock extends HtmlBlock {
         ._("Application Type:", app.getApplicationType())
         ._("Application Tags:", app.getApplicationTags())
         ._("YarnApplicationState:", clarifyAppState(app.getState()))
-        ._("FinalStatus reported by AM:",
+        ._("FinalStatus Reported by AM:",
           clairfyAppFinalStatus(app.getFinalStatus()))
         ._("Started:", Times.format(app.getStartTime()))
         ._("Elapsed:",
@@ -200,6 +203,45 @@ public class AppBlock extends HtmlBlock {
 
     table._();
     div._();
+
+    createResourceRequestsTable(html, app);
+  }
+
+  private void createResourceRequestsTable(Block html, AppInfo app) {
+    TBODY<TABLE<Hamlet>> tbody =
+        html.table("#ResourceRequests").thead().tr()
+          .th(".priority", "Priority")
+          .th(".resourceName", "ResourceName")
+          .th(".totalResource", "Capability")
+          .th(".numContainers", "NumContainers")
+          .th(".relaxLocality", "RelaxLocality")
+          .th(".nodeLabelExpression", "NodeLabelExpression")._()._().tbody();
+
+    Resource totalResource = Resource.newInstance(0, 0);
+    if (app.getResourceRequests() != null) {
+      for (ResourceRequest request : app.getResourceRequests()) {
+        if (request.getNumContainers() == 0) {
+          continue;
+        }
+
+        tbody.tr()
+          .td(String.valueOf(request.getPriority()))
+          .td(request.getResourceName())
+          .td(String.valueOf(request.getCapability()))
+          .td(String.valueOf(request.getNumContainers()))
+          .td(String.valueOf(request.getRelaxLocality()))
+          .td(request.getNodeLabelExpression() == null ? "N/A" : request
+              .getNodeLabelExpression())._();
+        if (request.getResourceName().equals(ResourceRequest.ANY)) {
+          Resources.addTo(totalResource,
+            Resources.multiply(request.getCapability(),
+              request.getNumContainers()));
+        }
+      }
+    }
+    html.div().$class("totalResourceRequests")
+      .h3("Total Outstanding Resource Requests: " + totalResource)._();
+    tbody._()._();
   }
 
   private String clarifyAppState(YarnApplicationState state) {
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/AppPage.java b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/webapp/AppPage.java
index a55c62f4b59..899332477f4 100644
--- a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/webapp/AppPage.java
+++ b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/webapp/AppPage.java
@@ -18,12 +18,16 @@
 
 package org.apache.hadoop.yarn.server.resourcemanager.webapp;
 
+import static org.apache.hadoop.yarn.webapp.view.JQueryUI.DATATABLES_ID;
+
 import org.apache.hadoop.yarn.webapp.SubView;
 
 public class AppPage extends RmView {
 
   @Override protected void preHead(Page.HTML<_> html) {
     commonPreHead(html);
+    set(DATATABLES_ID, "ResourceRequests");
+    setTableStyles(html, "ResourceRequests");
   }
 
   @Override protected Class<? extends SubView> content() {
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/AppsBlock.java b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/webapp/AppsBlock.java
index 054a1a7020e..935be612c72 100644
--- a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/webapp/AppsBlock.java
+++ b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/webapp/AppsBlock.java
@@ -46,12 +46,13 @@ import com.google.inject.Inject;
 class AppsBlock extends HtmlBlock {
   final ConcurrentMap<ApplicationId, RMApp> apps;
   private final Configuration conf;
-
+  final ResourceManager rm;
   @Inject
   AppsBlock(ResourceManager rm, ViewContext ctx, Configuration conf) {
     super(ctx);
     apps = rm.getRMContext().getRMApps();
     this.conf = conf;
+    this.rm = rm;
   }
 
   @Override public void render(Block html) {
@@ -85,7 +86,7 @@ class AppsBlock extends HtmlBlock {
       if (reqAppStates != null && !reqAppStates.contains(app.createApplicationState())) {
         continue;
       }
-      AppInfo appInfo = new AppInfo(app, true, WebAppUtils.getHttpSchemePrefix(conf));
+      AppInfo appInfo = new AppInfo(rm, app, true, WebAppUtils.getHttpSchemePrefix(conf));
       String percent = String.format("%.1f", appInfo.getProgress());
       //AppID numerical value parsed by parseHadoopID in yarn.dt.plugins.js
       appsTableData.append("[\"<a href='")
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/FairSchedulerAppsBlock.java b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/webapp/FairSchedulerAppsBlock.java
index 42ee53c3247..8cfd246c73c 100644
--- a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/webapp/FairSchedulerAppsBlock.java
+++ b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/webapp/FairSchedulerAppsBlock.java
@@ -56,7 +56,7 @@ public class FairSchedulerAppsBlock extends HtmlBlock {
   final ConcurrentMap<ApplicationId, RMApp> apps;
   final FairSchedulerInfo fsinfo;
   final Configuration conf;
-  
+  final ResourceManager rm;
   @Inject
   public FairSchedulerAppsBlock(ResourceManager rm, ViewContext ctx,
       Configuration conf) {
@@ -73,6 +73,7 @@ public class FairSchedulerAppsBlock extends HtmlBlock {
       }
     }
     this.conf = conf;
+    this.rm = rm;
   }
   
   @Override public void render(Block html) {
@@ -107,7 +108,7 @@ public class FairSchedulerAppsBlock extends HtmlBlock {
       if (reqAppStates != null && !reqAppStates.contains(app.createApplicationState())) {
         continue;
       }
-      AppInfo appInfo = new AppInfo(app, true, WebAppUtils.getHttpSchemePrefix(conf));
+      AppInfo appInfo = new AppInfo(rm, app, true, WebAppUtils.getHttpSchemePrefix(conf));
       String percent = String.format("%.1f", appInfo.getProgress());
       ApplicationAttemptId attemptId = app.getCurrentAppAttempt().getAppAttemptId();
       int fairShare = fsinfo.getAppFairShare(attemptId);
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/RMWebServices.java b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/webapp/RMWebServices.java
index 1834b6a1a7d..f8836d5e79b 100644
--- a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/webapp/RMWebServices.java
+++ b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/webapp/RMWebServices.java
@@ -476,8 +476,8 @@ public class RMWebServices {
         }
       }
 
-      AppInfo app = new AppInfo(rmapp, hasAccess(rmapp, hsr),
-          WebAppUtils.getHttpSchemePrefix(conf));
+      AppInfo app = new AppInfo(rm, rmapp,
+          hasAccess(rmapp, hsr), WebAppUtils.getHttpSchemePrefix(conf));
       allApps.add(app);
     }
     return allApps;
@@ -617,7 +617,7 @@ public class RMWebServices {
     if (app == null) {
       throw new NotFoundException("app with id: " + appId + " not found");
     }
-    return new AppInfo(app, hasAccess(app, hsr), hsr.getScheme() + "://");
+    return new AppInfo(rm, app, hasAccess(app, hsr), hsr.getScheme() + "://");
   }
 
   @GET
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/AppInfo.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/AppInfo.java
index 66940cbea44..79b22482817 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/AppInfo.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/AppInfo.java
@@ -17,6 +17,8 @@
  */
 package org.apache.hadoop.yarn.server.resourcemanager.webapp.dao;
 
+import java.util.List;
+
 import javax.xml.bind.annotation.XmlAccessType;
 import javax.xml.bind.annotation.XmlAccessorType;
 import javax.xml.bind.annotation.XmlRootElement;
@@ -27,11 +29,13 @@ import org.apache.hadoop.yarn.api.records.ApplicationResourceUsageReport;
 import org.apache.hadoop.yarn.api.records.Container;
 import org.apache.hadoop.yarn.api.records.FinalApplicationStatus;
 import org.apache.hadoop.yarn.api.records.Resource;
+import org.apache.hadoop.yarn.api.records.ResourceRequest;
 import org.apache.hadoop.yarn.api.records.YarnApplicationState;
 import org.apache.hadoop.yarn.server.resourcemanager.ResourceManager;
 import org.apache.hadoop.yarn.server.resourcemanager.rmapp.RMApp;
 import org.apache.hadoop.yarn.server.resourcemanager.rmapp.RMAppMetrics;
 import org.apache.hadoop.yarn.server.resourcemanager.rmapp.attempt.RMAppAttempt;
+import org.apache.hadoop.yarn.server.resourcemanager.scheduler.AbstractYarnScheduler;
 import org.apache.hadoop.yarn.util.ConverterUtils;
 import org.apache.hadoop.yarn.util.Times;
 import org.apache.hadoop.yarn.webapp.util.WebAppUtils;
@@ -88,10 +92,14 @@ public class AppInfo {
   protected int numNonAMContainerPreempted;
   protected int numAMContainerPreempted;
 
+  protected List<ResourceRequest> resourceRequests;
+
   public AppInfo() {
   } // JAXB needs this
 
-  public AppInfo(RMApp app, Boolean hasAccess, String schemePrefix) {
+  @SuppressWarnings({ "rawtypes", "unchecked" })
+  public AppInfo(ResourceManager rm, RMApp app, Boolean hasAccess,
+      String schemePrefix) {
     this.schemePrefix = schemePrefix;
     if (app != null) {
       String trackingUrl = app.getTrackingUrl();
@@ -154,6 +162,9 @@ public class AppInfo {
             allocatedVCores = usedResources.getVirtualCores();
             runningContainers = resourceReport.getNumUsedContainers();
           }
+          resourceRequests =
+              ((AbstractYarnScheduler) rm.getRMContext().getScheduler())
+                .getPendingResourceRequestsForAttempt(attempt.getAppAttemptId());
         }
       }
 
@@ -299,4 +310,8 @@ public class AppInfo {
   public long getVcoreSeconds() {
     return vcoreSeconds;
   }
+
+  public List<ResourceRequest> getResourceRequests() {
+    return this.resourceRequests;
+  }
 }
diff --git a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/test/java/org/apache/hadoop/yarn/server/resourcemanager/webapp/TestRMWebAppFairScheduler.java b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/test/java/org/apache/hadoop/yarn/server/resourcemanager/webapp/TestRMWebAppFairScheduler.java
index f07cb8d2f15..b850a5e70b9 100644
--- a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/test/java/org/apache/hadoop/yarn/server/resourcemanager/webapp/TestRMWebAppFairScheduler.java
+++ b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/test/java/org/apache/hadoop/yarn/server/resourcemanager/webapp/TestRMWebAppFairScheduler.java
@@ -22,6 +22,7 @@ import com.google.common.collect.Maps;
 import com.google.inject.Binder;
 import com.google.inject.Injector;
 import com.google.inject.Module;
+
 import org.apache.hadoop.util.StringUtils;
 import org.apache.hadoop.yarn.api.records.ApplicationAttemptId;
 import org.apache.hadoop.yarn.api.records.ApplicationId;
@@ -35,8 +36,8 @@ import org.apache.hadoop.yarn.server.resourcemanager.rmapp.RMApp;
 import org.apache.hadoop.yarn.server.resourcemanager.rmapp.RMAppMetrics;
 import org.apache.hadoop.yarn.server.resourcemanager.rmapp.RMAppState;
 import org.apache.hadoop.yarn.server.resourcemanager.rmapp.attempt.RMAppAttempt;
+import org.apache.hadoop.yarn.server.resourcemanager.scheduler.AbstractYarnScheduler;
 import org.apache.hadoop.yarn.server.resourcemanager.scheduler.ResourceScheduler;
-
 import org.apache.hadoop.yarn.server.resourcemanager.scheduler.fair.FSAppAttempt;
 import org.apache.hadoop.yarn.server.resourcemanager.scheduler.fair.FairScheduler;
 import org.apache.hadoop.yarn.server.resourcemanager.scheduler.fair.FairSchedulerConfiguration;
@@ -149,13 +150,18 @@ public class TestRMWebAppFairScheduler {
       i++;
     }
 
-    return new RMContextImpl(null, null, null, null,
+    RMContextImpl rmContext =  new RMContextImpl(null, null, null, null,
         null, null, null, null, null, null) {
       @Override
       public ConcurrentMap<ApplicationId, RMApp> getRMApps() {
         return applicationsMaps;
       }
+      @Override
+      public ResourceScheduler getScheduler() {
+        return mock(AbstractYarnScheduler.class);
+      }
     };
+    return rmContext;
   }
 
   private static ResourceManager mockRm(RMContext rmContext) throws
diff --git a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/test/java/org/apache/hadoop/yarn/server/resourcemanager/webapp/TestRMWebServicesApps.java b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/test/java/org/apache/hadoop/yarn/server/resourcemanager/webapp/TestRMWebServicesApps.java
index 705fd316af1..c60a58412b3 100644
--- a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/test/java/org/apache/hadoop/yarn/server/resourcemanager/webapp/TestRMWebServicesApps.java
+++ b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/test/java/org/apache/hadoop/yarn/server/resourcemanager/webapp/TestRMWebServicesApps.java
@@ -1314,8 +1314,7 @@ public class TestRMWebServicesApps extends JerseyTestBase {
   public void verifyAppInfo(JSONObject info, RMApp app) throws JSONException,
       Exception {
 
-    // 28 because trackingUrl not assigned yet
-    assertEquals("incorrect number of elements", 26, info.length());
+    assertEquals("incorrect number of elements", 27, info.length());
 
     verifyAppInfoGeneric(app, info.getString("id"), info.getString("user"),
         info.getString("name"), info.getString("applicationType"),