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https://issues.apache.org/jira/browse/HDFS-2781?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13201591#comment-13201591
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Todd Lipcon commented on HDFS-2781:
-----------------------------------
Currently, if the shared edits goes away, we don't drop into safe mode, but
rather abort the NN completely. So we probably need a different task
(non-HA-specific) to allow the NN to drop to safemode instead of aborting.
> Add client protocol and DFSadmin for command to restore failed storage
> ----------------------------------------------------------------------
>
> Key: HDFS-2781
> URL: https://issues.apache.org/jira/browse/HDFS-2781
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: ha
> Affects Versions: HA branch (HDFS-1623)
> Reporter: Eli Collins
> Assignee: Eli Collins
>
> Per HDFS-2769, it's important that an admin be able to ask the NN to try to
> restore failed storage since we may drop into SM until the shared edits dir
> is restored (w/o having to wait for the next checkpoint). There's currently
> an API (and usage in DFSAdmin) to flip the flag indicating whether the NN
> should try to restore failed storage but not that it should actually attempt
> to do so. This jira is to add one. This is useful outside HA but doing as an
> HDFS-1623 sub-task since it's motivated by HA.
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