[PATCH 5 of 5 RFC] exchange: support phases discovery via public heads

[Gregory Szorc]

On Mon, Feb 15, 2016 at 6:47 PM, Mike Hommey <mh at glandium.org> wrote:

> On Mon, Feb 15, 2016 at 06:03:36PM -0800, Gregory Szorc wrote:
> > # HG changeset patch
> > # User Gregory Szorc <gregory.szorc at gmail.com>
> > # Date 1455588068 28800
> > #      Mon Feb 15 18:01:08 2016 -0800
> > # Node ID d51ed0ddd05c3c716df5fbd2e811285bcac7366c
> > # Parent  8b939990c70a4e545f18db3338f7798f09a94ada
> > exchange: support phases discovery via public heads
> >
> > Now that we can detect when the server supports exposing phases via
> > public heads, we leverage this namespace as part of phases discovery.
> >
> > On Mozilla's Try repository, the phases listkeys response drops from
> > ~64k entries / 2.8 MB to < 1000 entries and < 65 kbytes.
>
> While this works with Mozilla's Try, what about hypothetical(?)
> heavy-headed *publishing* repositories? This set of changes would make
> them go the opposite direction.
>

Yup. Hence the RFC. We probably want a server-side config knob or something
on the server that tells the client whether to prefer draft roots or public
heads depending on which has fewer entries.
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