Hadoop is based on Apache Hadoop 2.4 and includes the following additional patches:
HDFS-5257:
addBlock()retry should return LocatedBlock with locations else client will get AIOBEHDFS-5089: When a LayoutVersion supports SNAPSHOT, it must support
FSIMAGE_NAME_OPTIMIZATION.BUG-8178: Datanodes fail to register with namenode due to minimum version check.
