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https://issues.apache.org/jira/browse/HADOOP-3489?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12603198#action_12603198
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Konstantin Shvachko commented on HADOOP-3489:
---------------------------------------------
+1
> 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
>
> Attachments: HADOOP-3489-1.patch
>
>
> 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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