YARN-3552. RM Web UI shows -1 running containers for completed apps. Contributed by Rohith

(cherry picked from commit 9356cf8676)

hadoop-yarn-project/CHANGES.txt

@@ -260,6 +260,9 @@ Release 2.8.0 - UNRELEASED
     YARN-2725. Added test cases of retrying creating znode in ZKRMStateStore.
     (Tsuyoshi Ozawa via jianhe)
 
+    YARN-3552. RM Web UI shows -1 running containers for completed apps
+    (Rohith via jlowe)
+
 Release 2.7.1 - UNRELEASED
 
   INCOMPATIBLE CHANGES

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/webapp/FairSchedulerAppsBlock.java

@@ -133,7 +133,8 @@ public class FairSchedulerAppsBlock extends HtmlBlock {
       .append(appInfo.getFinishTime()).append("\",\"")
       .append(appInfo.getState()).append("\",\"")
       .append(appInfo.getFinalStatus()).append("\",\"")
-      .append(appInfo.getRunningContainers()).append("\",\"")
+      .append(appInfo.getRunningContainers() == -1 ? "N/A" : String
+         .valueOf(appInfo.getRunningContainers())).append("\",\"")
       // Progress bar
       .append("<br title='").append(percent)
       .append("'> <div class='").append(C_PROGRESSBAR).append("' title='")

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/webapp/RMAppsBlock.java

@@ -110,7 +110,8 @@ public class RMAppsBlock extends AppsBlock {
         .append("\",\"")
         .append(app.getFinalAppStatus())
         .append("\",\"")
-        .append(String.valueOf(app.getRunningContainers()))
+        .append(app.getRunningContainers() == -1 ? "N/A" : String
+            .valueOf(app.getRunningContainers()))
         .append("\",\"")
         // Progress bar
         .append("<br title='").append(percent).append("'> <div class='")