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https://issues.apache.org/jira/browse/HDFS-2914?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13203099#comment-13203099
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Hari Mankude commented on HDFS-2914:
------------------------------------
When shared edits dir is bounced, df will return space of zero. Since shared is
required dir, standby nn will enter into safe mode.
2012-02-08 01:08:19,850 WARN namenode.NameNodeResourceChecker
(NameNodeResourceChecker.java:isResourceAvailable(89)) - Space available on
volume 'nfs directory' is 0, which is below the configured reserved amount
104857600
2012-02-08 01:08:19,853 WARN namenode.FSNamesystem
(FSNamesystem.java:run(3095)) - NameNode low on available disk space. Entering
safe mode.
The fix could be trivial enough to exit safe mode when shared resources become
available for standby NN.
> HA Standby stuck in safemode when shared edits directory is bounced
> -------------------------------------------------------------------
>
> Key: HDFS-2914
> URL: https://issues.apache.org/jira/browse/HDFS-2914
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: ha, name-node
> Affects Versions: HA branch (HDFS-1623)
> Reporter: Hari Mankude
>
> When shared edits dir is bounced, standby NN is put into safemode by the
> NameNodeResourceMonitor(). However, there is no path for it to exit out of
> safe mode when shared edits dir reappears.
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