From mboxrd@z Thu Jan  1 00:00:00 1970
From: ludo@gnu.org (Ludovic =?UTF-8?Q?Court=C3=A8s?=)
Subject: bug#26201: hydra.gnu.org uses =?UTF-8?Q?=E2=80=98guix_?=
	=?UTF-8?Q?publish=E2=80=99?= for nars and narinfos
Date: Tue, 18 Apr 2017 23:27:44 +0200
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To: Mark H Weaver <mhw@netris.org>
Cc: 26201@debbugs.gnu.org, guix-sysadmin@gnu.org

ludo@gnu.org (Ludovic Court=C3=A8s) skribis:

>   2. Produce a narinfo and corresponding nar the first time they are
>      requested.  So, the first time we receive =E2=80=9CGET foo.narinfo=
=E2=80=9D, return
>      404 and spawn a thread to compute foo.narinfo and foo.nar.  Return
>      200 only when both are ready.
>
>      The precomputed nar{,info}s would be kept in a cache and we could
>      make sure a narinfo and its nar have the same lifetime, which
>      addresses one of the problems we have.
>
>      pros: better HTTP latency and bandwidth
>      pros: allows us to add a Content-Length for nars
>      pros: helps keep narinfo/nar lifetime in sync
>      cons: doesn=E2=80=99t reduce load on hydra.gnu.org
>      cons: exposes inconsistency between the store contents and the HTTP
>            response (you may get 404 even if the thing is actually in
>            store), but maybe that=E2=80=99s not a problem

Implemented in commit 00753f7038234a0f5a79be3ec9ab949840a18743.

I=E2=80=99ll set up a test instance shortly.

Ludo=E2=80=99.