HDFS-4932. Avoid a wide line on the name node webUI if we have more Journal nodes. Contributed by Fengdong Yu.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1497141 13f79535-47bb-0310-9956-ffa450edef68
HADOOP-9673. NetworkTopology: When a node cannot be added, print out its location for diagnostic purposes

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1497176 13f79535-47bb-0310-9956-ffa450edef68
Merge branch 'trunk' into HDFS-4372
HDFS-4372: remove isLengthKnown and check length for -1 return instead