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From "Eli Collins (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-2802) Support for RW/RO snapshots in HDFS
Date Thu, 10 May 2012 05:46:14 GMT

    [ https://issues.apache.org/jira/browse/HDFS-2802?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13272103#comment-13272103
] 

Eli Collins commented on HDFS-2802:
-----------------------------------

Thanks Hari. Wrt scenario #3 doesn't this imply that the user would have to run two HBase
instances on the same cluster - one running from /hbase and one running from /snapshot/hbase?
If not then you need to shutdown the HBase instance running on the production data and then
restart it with the snapshot. Maybe I'm missing something but both options (stopping the production
instance and running two instances on the same production hardware) seem unrealistic. Also,
don't HBase snapshots (HBASE-50) solve this problem? Are there other use cases aside from
HBase?
                
> Support for RW/RO snapshots in HDFS
> -----------------------------------
>
>                 Key: HDFS-2802
>                 URL: https://issues.apache.org/jira/browse/HDFS-2802
>             Project: Hadoop HDFS
>          Issue Type: New Feature
>          Components: data-node, name-node
>    Affects Versions: 0.24.0
>            Reporter: Hari Mankude
>            Assignee: Hari Mankude
>         Attachments: snapshot-one-pager.pdf
>
>
> Snapshots are point in time images of parts of the filesystem or the entire filesystem.
Snapshots can be a read-only or a read-write point in time copy of the filesystem. There are
several use cases for snapshots in HDFS. I will post a detailed write-up soon with with more
information.

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