Name node silently changes state
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Key: HADOOP-2373
URL: https://issues.apache.org/jira/browse/HADOOP-2373
Project: Hadoop
Issue Type: Bug
Affects Versions: 0.16.0
Reporter: Robert Chansler
Assignee: Konstantin Shvachko
1. The name node should create a log message when entering the "extension"
period of safe mode after achieving the minimal replication threshold.
Logging state changes is a Good Idea. When diagnosing 2159, there is no
evidence whether the name node is in the extension period or not.
2. When in safe mode, the name node should periodically explain _why_ it is
still in safe mode. (2159 again)
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