YARN-3823. Fix mismatch in default values for

yarn.scheduler.maximum-allocation-vcores property. Contributed by Ray
Chiang.

(cherry picked from commit 7405c59799ed1b8ad1a7c6f1b18fabf49d0b92b2)

hadoop-yarn-project/CHANGES.txt

@@ -532,6 +532,9 @@ Release 2.8.0 - UNRELEASED
     YARN-3768. ArrayIndexOutOfBoundsException with empty environment variables.
     (Zhihai Xu via gera)
 
+    YARN-3823. Fix mismatch in default values for 
+    yarn.scheduler.maximum-allocation-vcores property. (Ray Chiang via devaraj)
+
 Release 2.7.2 - UNRELEASED
 
   INCOMPATIBLE CHANGES

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-common/src/main/resources/yarn-default.xml

@@ -276,7 +276,7 @@
     in terms of virtual CPU cores. Requests higher than this will throw a
     InvalidResourceRequestException.</description>
     <name>yarn.scheduler.maximum-allocation-vcores</name>
-    <value>32</value>
+    <value>4</value>
   </property>
 
   <property>