New candidate JEP: 357: Migrate from Mercurial to Git

[Aleksey Shipilev]

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