YARN-3892. Fixed NPE on RMStateStore#serviceStop when CapacityScheduler#serviceInit fails. Contributed by Bibin A Chundatt

hadoop-yarn-project/CHANGES.txt

@@ -598,6 +598,9 @@ Release 2.8.0 - UNRELEASED
     YARN-2194. Fix bug causing CGroups functionality to fail on RHEL7.
     (Wei Yan via vvasudev)
 
+    YARN-3892. Fixed NPE on RMStateStore#serviceStop when
+    CapacityScheduler#serviceInit fails. (Bibin A Chundatt via jianhe)
+
 Release 2.7.2 - UNRELEASED
 
   INCOMPATIBLE CHANGES

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/recovery/ZKRMStateStore.java

@@ -40,6 +40,7 @@ import org.apache.curator.retry.RetryNTimes;
 import org.apache.hadoop.classification.InterfaceAudience.Private;
 import org.apache.hadoop.classification.InterfaceStability.Unstable;
 import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.io.IOUtils;
 import org.apache.hadoop.security.token.delegation.DelegationKey;
 import org.apache.hadoop.util.ZKUtil;
 import org.apache.hadoop.yarn.api.records.ApplicationAttemptId;
@@ -312,7 +313,7 @@ public class ZKRMStateStore extends RMStateStore {
       verifyActiveStatusThread.interrupt();
       verifyActiveStatusThread.join(1000);
     }
-    curatorFramework.close();
+    IOUtils.closeStream(curatorFramework);
   }
 
   @Override