HDFS-5548. Use ConcurrentHashMap in portmap. Contributed by Haohui Mai

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1545756 13f79535-47bb-0310-9956-ffa450edef68
HDFS-5286. Flatten INodeDirectory hierarchy: Replace INodeDirectoryWithQuota with DirectoryWithQuotaFeature.


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1545768 13f79535-47bb-0310-9956-ffa450edef68
HDFS-5561. FSNameSystem#getNameJournalStatus() in JMX should return plain text instead of HTML. Contributed by Haohui Mai.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1545791 13f79535-47bb-0310-9956-ffa450edef68