YARN-9775. RMWebServices /scheduler-conf GET returns all hadoop configurations for ZKConfigurationStore. Contributed by Prabhu Joseph

(cherry picked from commit 8660e48ca15098e891c560beb3181c22ef3f80ff)
(cherry picked from commit e4249c320257586384035ea3fc286fe54cc699a1)
(cherry picked from commit 6baa0d1e4d78c15833257d98bdd2b38806faed9f)

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/scheduler/capacity/conf/ZKConfigurationStore.java

@@ -196,7 +196,7 @@ public class ZKConfigurationStore extends YarnConfigurationStore {
     try {
       Map<String, String> map =
           (HashMap<String, String>) deserializeObject(serializedSchedConf);
-      Configuration c = new Configuration();
+      Configuration c = new Configuration(false);
       for (Map.Entry<String, String> e : map.entrySet()) {
         c.set(e.getKey(), e.getValue());
       }

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/test/java/org/apache/hadoop/yarn/server/resourcemanager/scheduler/capacity/conf/TestZKConfigurationStore.java

@@ -117,6 +117,8 @@ public class TestZKConfigurationStore extends ConfigurationStoreBaseTest {
     confStore.initialize(conf, schedConf, rmContext);
     assertEquals("val", confStore.retrieve().get("key"));
 
+    assertNull(confStore.retrieve().get(YarnConfiguration.RM_HOSTNAME));
+
     // Create a new configuration store, and check for old configuration
     confStore = createConfStore();
     schedConf.set("key", "badVal");