NPE in SafeModeMonitor
----------------------
Key: HADOOP-3489
URL: https://issues.apache.org/jira/browse/HADOOP-3489
Project: Hadoop Core
Issue Type: Bug
Components: dfs
Affects Versions: 0.18.0
Reporter: Konstantin Shvachko
Fix For: 0.18.0
If dfsadmin issues -safemode leave command when name-node is in the extended
period of safe mode the SafeModeMonitor throws the following exception:
{code}
Exception in thread "[EMAIL PROTECTED]" java.lang.NullPointerException
at
org.apache.hadoop.dfs.FSNamesystem$SafeModeMonitor.run(FSNamesystem.java:3914)
at java.lang.Thread.run(Thread.java:619)
{code}
The problem is that when SafeModeMonitor.run() wakes up it tries to check
whether it canLeave() the safe mode, but the safe mode is off already,
and therefore the "safemode" field is null.
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