Addendum: HDFS-10271.

Added CHANGES.txt entry

hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt

@@ -1310,6 +1310,9 @@ Release 2.6.5 - UNRELEASED
     HDFS-9347. Invariant assumption in TestQuorumJournalManager.shutdown()
     is wrong. (Wei-Chiu Chuang via zhz)
 
+    HDFS-10271. Extra bytes are getting released from reservedSpace for append
+    (Brahma Reddy Battula via vinayakumarb)
+
 Release 2.6.4 - 2016-02-11
 
   INCOMPATIBLE CHANGES