Add YARN-3849 to Release 2.6.4 entry in CHANGES.txt

hadoop-yarn-project/CHANGES.txt

@@ -2138,31 +2138,34 @@ Release 2.6.4 - UNRELEASED
 
   BUG FIXES
 
-  YARN-2975. FSLeafQueue app lists are accessed without required locks. (kasha)
+    YARN-2975. FSLeafQueue app lists are accessed without required locks. (kasha)
 
-  YARN-3857: Memory leak in ResourceManager with SIMPLE mode.
-  (mujunchao via zxu)
+    YARN-3857: Memory leak in ResourceManager with SIMPLE mode.
+    (mujunchao via zxu)
 
-  YARN-3535. Scheduler must re-request container resources when RMContainer transitions
-  from ALLOCATED to KILLED (rohithsharma and peng.zhang via asuresh)
+    YARN-3535. Scheduler must re-request container resources when RMContainer transitions
+    from ALLOCATED to KILLED (rohithsharma and peng.zhang via asuresh)
 
-  YARN-4452. NPE when submit Unmanaged application. (Naganarasimha G R
-  via junping_du)
+    YARN-4452. NPE when submit Unmanaged application. (Naganarasimha G R
+    via junping_du)
+
+    YARN-3893. Both RM in active state when Admin#transitionToActive failure
+    from refeshAll() (Bibin A Chundatt via rohithsharmaks)
 
-  YARN-3893. Both RM in active state when Admin#transitionToActive failure
-  from refeshAll() (Bibin A Chundatt via rohithsharmaks)
+    YARN-3697. FairScheduler: ContinuousSchedulingThread can fail to shutdown.
+    (Zhihai Xu via kasha)
 
-  YARN-3697. FairScheduler: ContinuousSchedulingThread can fail to shutdown.
-  (Zhihai Xu via kasha)
+    YARN-4546. ResourceManager crash due to scheduling opportunity overflow.
+    (Jason Lowe via junping_du)
 
-  YARN-4546. ResourceManager crash due to scheduling opportunity overflow.
-  (Jason Lowe via junping_du)
+    YARN-2902. Killing a container that is localizing can orphan resources in
+    the DOWNLOADING state (Varun Saxena via jlowe)
 
-  YARN-2902. Killing a container that is localizing can orphan resources in
-  the DOWNLOADING state (Varun Saxena via jlowe)
+    YARN-4354. Public resource localization fails with NPE. (Jason Lowe via
+    junping_du)
 
-  YARN-4354. Public resource localization fails with NPE. (Jason Lowe via
-  junping_du)
+    YARN-3849. Too much of preemption activity causing continuos killing of
+    containers across queues. (Sunil G via wangda)
 
 Release 2.6.3 - 2015-12-17