[jira] Updated: (HADOOP-4826) Admin command saveNamespace.

["Robert Chansler (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HADOOP-4826?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Robert Chansler updated HADOOP-4826:
------------------------------------

    Release Note: Introduced new dfsadmin command saveNamespace to command the name service to do an immediate save of the file system image.
    Hadoop Flags: [Incompatible change, Reviewed]  (was: [Reviewed, Incompatible change])

Edit release note for publication.

> 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, 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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