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From "Aaron T. Myers (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-4076) Support snapshot of single files
Date Fri, 19 Oct 2012 06:58:05 GMT

    [ https://issues.apache.org/jira/browse/HDFS-4076?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13479669#comment-13479669
] 

Aaron T. Myers commented on HDFS-4076:
--------------------------------------

bq. Good idea. Created a version for that and changed this jira appropriately.

Thanks, Suresh.

I'd still prefer to wait a few days before checking this in. Folks often ask for this and
it's usually honored. I'd prefer to not wait until merge time to give feedback on this design
and implementation, since as we saw recently merge time is often so late as to make changes
to the design difficult. I haven't even had a chance yet to thoroughly review the updated
design doc. I hope you appreciate my desire to fully understand the intended design before
a lot of time is invested in implementing it.

I suppose if you're so chomping at the bit to get this checked in to the branch that you can't
wait until a few days then I can live with that, but waiting for a few days would be appreciated.
                
> Support snapshot of single files
> --------------------------------
>
>                 Key: HDFS-4076
>                 URL: https://issues.apache.org/jira/browse/HDFS-4076
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: name-node
>    Affects Versions: HDFS-2802
>            Reporter: Tsz Wo (Nicholas), SZE
>            Assignee: Tsz Wo (Nicholas), SZE
>         Attachments: h4076_20121018.patch
>
>
> The snapshot of a file shares the blocks with the original file in order to avoid copying
data.  However, the snapshot file has its own metadata so that it could have independent permission,
replication, access time, etc.

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