HADOOP-9276. Allow BoundedByteArrayOutputStream to be resettable. Contributed by Arun Murthy

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1442312 13f79535-47bb-0310-9956-ffa450edef68
HDFS-4462. 2NN will fail to checkpoint after an HDFS upgrade from a pre-federation version of HDFS. Contributed by Aaron T. Myers.


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1442375 13f79535-47bb-0310-9956-ffa450edef68