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Date: Fri, 6 Jun 2008 15:12:45 -0700 (PDT)
From: "Konstantin Shvachko (JIRA)" <jira@apache.org>
To: core-dev@hadoop.apache.org
Subject: [jira] Commented: (HADOOP-3489) NPE in SafeModeMonitor
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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 ] 

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 "org.apache.hadoop.dfs.FSNamesystem$SafeModeMonitor@dc86eb" java.lang.NullPointerException
> 	at org.apache.hadoop.dfs.FSNamesystem$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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