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https://issues.apache.org/jira/browse/HDFS-2914?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13203135#comment-13203135
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Aaron T. Myers commented on HDFS-2914:
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bq. The issue I see is that even if this standby is made active later on, it
will not exit out of the safemode unless user does the safemode leave. Do we
want this behaviour?
I think we probably do. If the NFS mount is flaky, we've got bigger problems
than just the NN being moved into SM.
bq. The other problem with this approach is that if nfs dir bounces even once,
standby will go into safemode and this will happen silently without alerts.
I guess the admin should configure some alerts for the NN being in SM, then. :)
But regardless, 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." Such a change would not be
specific to the HA branch, however, and should probably be done on trunk.
> 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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