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https://issues.apache.org/jira/browse/HDFS-1726?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13413896#comment-13413896
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Steve Loughran commented on HDFS-1726:
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It'd be nice to also have text for end users, which could also be set in a
manual entry mode. This would let the ops teams add text like "down for rack
maintenance back at 18:00" for the web UI and exception text
> query method for what kind of safe mode the Namenode is in
> ----------------------------------------------------------
>
> Key: HDFS-1726
> URL: https://issues.apache.org/jira/browse/HDFS-1726
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: name-node
> Affects Versions: 0.22.0
> Reporter: Matt Foley
> Assignee: Matt Foley
> Fix For: 0.24.0
>
> Attachments: SafeModeState_v2.patch
>
>
> If we could differentiate between "startup safemode" vs other safemode, it
> would be easier to do startup optimizations like HDFS-1295. Looking at
> FSNamesystem, this can be queried, but not with a single query, and the
> semantics are not reliable under future changes. Also, the FSNamesystem code
> itself, internally, uses more than one way to test for manual safe mode.
> Proposal is to create a status field and query method in FSNamesystem with
> enum values
> {NOT_IN_SAFEMODE, SAFEMODE_STARTUP, SAFEMODE_EXTENSION, SAFEMODE_MANUAL}
> If in the future we add automatic fallback to safe mode, we would add value
> SAFEMODE_AUTOMATIC.
> This change will make it easier to do startup optimizations, and will also
> allow making the safemode management code in FSNamesystem simpler and more
> consistent.
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