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https://issues.apache.org/jira/browse/HADOOP-4826?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Tsz Wo (Nicholas), SZE updated HADOOP-4826:
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Hadoop Flags: [Incompatible change]
> In addition, the name-node must be in safe mode, because we don't want to
> allow changing namespace during the save.
Safe mode may not be required since the namespace lock is acquired before
saving images. Consider that saving images may take a long time, it makes
sense to set safe mode.
> Admin command saveNamespace.
> ----------------------------
>
> Key: HADOOP-4826
> URL: https://issues.apache.org/jira/browse/HADOOP-4826
> Project: Hadoop Core
> Issue Type: New Feature
> Components: dfs
> Reporter: Konstantin Shvachko
> Assignee: Konstantin Shvachko
> Fix For: 0.20.0
>
> Attachments: saveNamespace.patch, saveNamespace.patch
>
>
> It would be useful to have an admin command that saves current namespace.
> This command can be used before regular (planned) cluster shutdown.
> The command will save the namespace into storage directory(s) and reset the
> name-node journal (edits file).
> It will also reduce name-node startup time, because edits do not need to be
> digest.
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