Lustre devel - Jun 2008 - changelog interface

Peter, early in the changelog arch we had designed the changelog user 
API as a series of files that would show up under a special .lustre 
directory.  After the ZFS changelog investigation, I think it makes more 
sense to try and match the ZFS API so that changes to user tools are 
minimized.

So, as "zfs diff snap1 snap2" produces a stream to stdout, I think we 
should make "lctl diff startrec [endrec]" produce a similar stream. 
We
would also need a "lctl purge endrec" to clear out old changelog
records.

Any objections?

Makes sense.

Peter


On 6/23/08 11:52 PM, "Nathaniel Rutman" <Nathan.Rutman at
Sun.COM> wrote:
> Peter, early in the changelog arch we had designed the changelog user
> API as a series of files that would show up under a special .lustre
> directory.  After the ZFS changelog investigation, I think it makes more
> sense to try and match the ZFS API so that changes to user tools are
> minimized.
> 
> So, as "zfs diff snap1 snap2" produces a stream to stdout, I
think we
> should make "lctl diff startrec [endrec]" produce a similar
stream.  We
> would also need a "lctl purge endrec" to clear out old changelog
records.
> 
> Any objections?
>