HDFS-6529. Trace logging for RemoteBlockReader2 to identify remote datanode and file being read. Contributed by Anubhav Dhoot.


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1602539 13f79535-47bb-0310-9956-ffa450edef68
HDFS-6499. Use NativeIO#renameTo instead of File#renameTo in FileJournalManager. Contributed by Yongjun Zhang.


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1602543 13f79535-47bb-0310-9956-ffa450edef68