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https://issues.apache.org/jira/browse/HDFS-4076?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13479675#comment-13479675
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Suresh Srinivas commented on HDFS-4076:
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bq. 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.
There are couple of jiras pending on this jira. One thing we could do is use 
github so we can make the progress. But that is some thing I am trying to avoid.

bq. I'd prefer to not wait until merge time to give feedback on this design and 
implementation
That is why there is a meeting that Nicholas indicated will happen on the week 
of Oct 29th so the design is presented and discussed. Hopefully you will be 
able to attend this.


                
> 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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