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Cc: Obnam development <obnam-dev@obnam.org>
Subject: Re: Obnam FORMAT GREEN ALBATROSS status and roadmap
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On Wed, Feb 8, 2017 at 1:58 PM, Lars Wirzenius <liw@liw.fi> wrote:
> On Wed, Feb 08, 2017 at 12:34:07PM +0100, Thomas Schwinge wrote:
> > One idea I just had -- but I don't know if that is feasible to implement:
> > you could (internally!) have obnam "write" both the "current" and the
> > "Green Albatross" formats, and then every "read" operation would read
> > both of them, and compare that they return the same data. Then have
> > obnam complain if that doesn't match (with the "current" format's data
> > then taking precedence, I think). Obviously, that will add a lot of
> > overhead for every repository access, but any users willing to take that
> > can then easily help testing the "Green Albatross" format. But I don't
> > know if the repository abstraction in obnam is sufficiently generic for
> > being able to deal with two underlying repository formats, etc.
>
> I fear it'd make things so slow nobody would actually use this, even
> for testing. It'd mean obnam was making two backups at the same time.
>
You could start two obnam instances parallelly :D
--001a113f2fc895e2520548047c55
Content-Type: text/html; charset=UTF-8
Content-Transfer-Encoding: quoted-printable
<div dir=3D"ltr"><div class=3D"gmail_extra"><br><div class=3D"gmail_quote">=
On Wed, Feb 8, 2017 at 1:58 PM, Lars Wirzenius <span dir=3D"ltr"><<a hre=
f=3D"mailto:liw@liw.fi" target=3D"_blank">liw@liw.fi</a>></span> wrote:<=
br><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left=
:1px #ccc solid;padding-left:1ex"><span class=3D"">On Wed, Feb 08, 2017 at =
12:34:07PM +0100, Thomas Schwinge wrote:<br>
> One idea I just had -- but I don't know if that is feasible to imp=
lement:<br>
> you could (internally!) have obnam "write" both the "cu=
rrent" and the<br>
> "Green Albatross" formats, and then every "read" o=
peration would read<br>
> both of them, and compare that they return the same data.=C2=A0 Then h=
ave<br>
> obnam complain if that doesn't match (with the "current"=
format's data<br>
> then taking precedence, I think).=C2=A0 Obviously, that will add a lot=
of<br>
> overhead for every repository access, but any users willing to take th=
at<br>
> can then easily help testing the "Green Albatross" format.=
=C2=A0 But I don't<br>
> know if the repository abstraction in obnam is sufficiently generic fo=
r<br>
> being able to deal with two underlying repository formats, etc.<br>
<br>
</span>I fear it'd make things so slow nobody would actually use this, =
even<br>
for testing. It'd mean obnam was making two backups at the same time.<b=
r></blockquote></div><br></div><div class=3D"gmail_extra">You could start t=
wo obnam instances parallelly :D<br><br></div><div class=3D"gmail_extra"><b=
r></div></div>
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