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https://issues.apache.org/jira/browse/HDFS-2914?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13203109#comment-13203109
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Aaron T. Myers commented on HDFS-2914:
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Hey Hari, per the discussion on HDFS-1594, it is by design that the NN does not
automatically leave SM even after resources become available again. In order to
leave SM, the admin can run `hdfs dfsadmin -safemode leave', even while the NN
is in the standby state.
> 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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