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https://issues.apache.org/jira/browse/HDFS-2914?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13203169#comment-13203169
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Uma Maheswara Rao G commented on HDFS-2914:
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{quote}
I could probably be persuaded that the NN should leave SM automatically once
resources become available again, as long the implementation includes some
measure(s) to prevent the NN from flapping in/out of SM if the free space is
hovering near the threshold. Something like "leave SM automatically only if
free space is now well above what is required, and only if it's been like that
for several minutes."
{quote}
Yes, this sounds good. As NameNodeResourceChecker moved the system into
safemode on some condition, should be its responsibility to take out of the
safemode whenever system is out of that condition.
> 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: Sub-task
> 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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