Created: (HADOOP-1980) 'dfsadmin -safemode enter' should prevent the namenode from leaving

'dfsadmin -safemode enter' should prevent the namenode from
leaving safemode automatically after startup
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                 Key: HADOOP-1980
                 URL: htt
ps://issues.apache.org/jira/browse/HADOOP-1980
             Project: Hadoop
          Issue Type: Bug
          Components: dfs
            Reporter: Koji Noguchi
            Priority: Minor


When debugging, I'd like to be able to intentionally keep
the FS in a safemode. (For example, when looking at
HADOOP-1978).
Also, it'll be nice if the namenode can still update the
webUI/report when it hits the dfs.safemode.threshold.pct.

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