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From Jing Zhao <j...@hortonworks.com>
Subject Re: Applying delta between two HDFS snapshot using hdfs command
Date Mon, 14 Apr 2014 21:47:04 GMT
Hi Manoj,

    You're right, right now we do not have a complete snapshot
rollback/restore functionality in HDFS. Thus users have to manually
copy/delete files according to the snapshot diff report. There's an open
jira HDFS-4167 for it. We plan to provide this support soon.


On Mon, Apr 14, 2014 at 2:14 PM, Manoj Samel <manojsameltech@gmail.com>wrote:

> Hi,
> It seems the only restore from a HDFS snapshot using hdfs command line is
> copy snapshot files to a target path.
> If the use cases are
> 0. .... stuff ...
> 1. Take snapshot s_N
> 2. Add some files, delete other files
> 3. Take snapshot s_N+1
> then copying s_N+1 to target just copies the newly added file to target,
> it does not propagates the deletes between s_N and s_N+1.
> How does one apply the full delta between s_N and s_N+1 to target (and not
> just additions) ? Is Using Java API the only option or is it possible to
> use command line to do it ?
> Thanks,

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