From 37a82241010a949c0ac80d1379791e027a5dbace Mon Sep 17 00:00:00 2001
From: Rohith Sharma K S <rohithsharmaks@apache.org>
Date: Mon, 8 Jan 2018 15:52:03 +0530
Subject: [PATCH] YARN-7699. queueUsagePercentage is coming as INF for getApp
 REST api call. Contributed by Sunil G.

(cherry picked from commit 281350674c70d65233363849a8b60e9b7dc965cf)
---
 .../scheduler/common/fica/FiCaSchedulerApp.java       | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

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/common/fica/FiCaSchedulerApp.java b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/scheduler/common/fica/FiCaSchedulerApp.java
index cb6ff312406..1d91316f74f 100644
--- a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/scheduler/common/fica/FiCaSchedulerApp.java
+++ b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/scheduler/common/fica/FiCaSchedulerApp.java
@@ -995,14 +995,17 @@ public class FiCaSchedulerApp extends SchedulerApplicationAttempt {
               getAppAMNodePartitionName(), cluster);
       ResourceCalculator calc =
           rmContext.getScheduler().getResourceCalculator();
+      float queueUsagePerc = 0.0f;
       if (!calc.isInvalidDivisor(totalPartitionRes)) {
         float queueAbsMaxCapPerPartition =
             ((AbstractCSQueue) getQueue()).getQueueCapacities()
                 .getAbsoluteCapacity(getAppAMNodePartitionName());
-        float queueUsagePerc = calc.divide(totalPartitionRes,
-            report.getUsedResources(),
-            Resources.multiply(totalPartitionRes, queueAbsMaxCapPerPartition))
-            * 100;
+        if (queueAbsMaxCapPerPartition != 0) {
+          queueUsagePerc = calc.divide(totalPartitionRes,
+              report.getUsedResources(),
+              Resources.multiply(totalPartitionRes, queueAbsMaxCapPerPartition))
+              * 100;
+        }
         report.setQueueUsagePercentage(queueUsagePerc);
       }
       return report;