HDFS-7361. TestCheckpoint fails after change of log message related to locking violation. Contributed by Konstantin Shvachko.
HDFS-7367. HDFS short-circuit read cannot negotiate shared memory slot and file descriptors when SASL is enabled on DataTransferProtocol. Contributed by Chris Nauroth.
YARN-2812. TestApplicationHistoryServer is likely to fail on less powerful machine. Contributed by Zhijie Shen

(cherry picked from commit b0b52c4e11336ca2ad6a02d64c0b5d5a8f1339ae)
HDFS-7329. Improve logging when MiniDFSCluster fails to start. Contributed by Byron Wong.
HDFS-7336. Unused member DFSInputStream.buffersize. Contributed by Milan Desai.