Add "Number of Reporting Nodes" to namenode web UI
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Key: HDFS-2075
URL: https://issues.apache.org/jira/browse/HDFS-2075
Project: Hadoop HDFS
Issue Type: Improvement
Components: name-node, tools
Affects Versions: 0.20.2, 0.20.1
Reporter: Xing Jin
Priority: Minor
Fix For: 0.20.3
The namenode web UI misses some information when safemode is on (e.g., the
number of reporting nodes). These information will help us understand the
system status.
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