New candidate JEP: 357: Migrate from Mercurial to Git

[David Lloyd]

Similarly if you have another system nearby with a checkout, the
native SSH support of Git lets you easily clone it:

$ git clone -o workstation workstation:src/openjdk

And, having the remote created like this means that whenever you're
proximate to that system, you can push and pull directly to/from it,
which is very handy when you're working on something on your laptop
and want to push it over to a bigger system for testing.

On Tue, Jul 16, 2019 at 10:41 AM David Lloyd <david.lloyd at redhat.com> wrote:
>
> FWIW you can "seed" your clone if you have another one handy by
> cloning the local directory e.g. "git clone -o local ../other-checkout
> new-checkout".  Then fetching the upstream will only fetch objects
> that weren't in "other-checkout".  I do this frequently for large
> repositories, which is especially useful in laptop-in-coffee-shop
> kinds of situations.
>
> On Tue, Jul 16, 2019 at 10:37 AM Aleksey Shipilev <shade at redhat.com> wrote:
> >
> > On 7/16/19 4:23 PM, Aleksey Shipilev wrote:
> > > On 7/16/19 2:19 PM, Severin Gehwolf wrote:
> > >> Fresh clone times: Git has fewer metadata to transfer (above). JDK-
> > >> 8211383 could help for Mercurial how does it compare?
> > >
> > > Last I checked, jdk-jdk zstd bundle is about 260 MB. This is roughly how much data transfer would
> > > happen with clonebundles.
> >
> > For fun, redid the cloning experiment with clonebundles vs current Git mirror here:
> >   https://bugs.openjdk.java.net/browse/JDK-8211383?focusedCommentId=14278459#comment-14278459
> >
> > Amusingly, Mercurial with clonebundles gets me less total bandwidth than Git checkout, even after
> > Mercurial client did two transfers: the bundle itself, and several months of changesets on top. So
> > if we do care about transfer overhead, then migrating from (improved) Mercurial to Git is the
> > pessimisation, especially for slow links.
> >
> > See how "Alternatives" section gets curiouser and curiouser.
> >
> > --
> > Thanks,
> > -Aleksey
> >
>
>
> --
> - DML



-- 
- DML