Dear Matt,
please see below some additional background on Gerrit that you might find 
useful.

> On 28 Apr 2015, at 16:09, Matt W. Benjamin <m...@cohortfs.com> wrote:
> 
> Hi,
> 
> As I mentioned in an IRC discussion, my recollection from when OpenAFS
> implemented gerrit (also their own installation, but not to my
> knowledge customized), it was basically mandated that developers
> submit "one patch per change."
> 
>> From what I can tell, Frank finds problematic
> 
> 1) a lack in gerrit of a "changeset" concept, plus, apparently

It actually exists and is called “topic”. It will be very soon possible as well 
to merge a whole topic atomically with one click.

> 2) some missing automation to propagate review information into
>   git's history/commit msg

It is actually in beta and will be released very soon: it is called “NoteDB”. 
It is basically the archive of all review history (including ratings and 
comments) as Git objects.

> 
> I think both are potentially legitimate considerations, with a claim
> to be related to best practices (so potentially on a par with the
> motivations to update the review process).
> 
> In large corporate development environments I've worked in, the
> aspiration to get the 20% lacking in the off-the-shelf tool would
> be solved by some internal development.  In other cases, someone
> said, "no discussion, we're using VSS."
> 
> I don't have a very strong opinion, but I do somewhat feel that
> however much gerrit helps with some review beset practices, just
> doing what gerrithub appears to support oob probably brings
> arbitrary processes, not just best practices.
> 
> At the same time, I think the objection to "one patch per change"
> (which appears to be, "this well-formed, logical change which
> touches many files is too big for me t review") may be overblown.
> 
> If we could do one patch per-change, objection #1 might be
> overcome.  To overcome objection #2 seems to require some minimal
> tooling--I'm unclear whether it is compatible with gerrithub;
> If for some reason not, is there an organization volunteering to
> host and maintain/co-maintain aprivate gerrit installation?
> 
> Matt
> 
> ----- "DENIEL Philippe" <philippe.den...@cea.fr> wrote:
> 
>> Hi Frank,
>> 
>> reply is in the message body. I cut some pieces of your original
>> message 
>> to avoid a too long message where information would be diluted.
>> 
>> On 04/24/15 23:59, Frank Filz wrote:
>>> 1. Abandon gerrithub, revert to using github branches for review and
>> merge.
>>> This has a few problems.
>> The issue with github-based reviews are known. Avoiding solving a 
>> current issue by stepping back to formerly known problems may seem 
>> comfortable, but this is no evolution, it's clearly a regression.
>> 
>>> 2a. One solution here is use an e-mail review system (like the
>> kernel
>>> process).
>> This is prehistory... Kernel community works like this because they
>> have 
>> this habit since the (Linux) world was new and nothing else existed.
>> Can 
>> someone seriously say it would be user-friendly ? OK, mail are
>> archived, 
>> but not indexed. Looking for a review will be like lookingfora needle
>> 
>> ina haystack. Once hundreds of mail will have been sent and received
>> and 
>> re-re-re-re-replied finding useful information will become impossible.
>> 
>> Please don't bring us back to Stone Age.
>> 
>>> 3. Change our workflow to work with gerrithub better (stop using
>> the
>>> incremental patch process). One loss here would be the ability to
>> bisect and
>>> hone in on a small set of changes that caused a bug.
>> It seems like a much better idea. People in my team are developing in
>> 
>> the Lustre code. The Lustre community works with a private gerrit
>> since 
>> the beginning. They have their best practices and their workflow.
>> In particular, they have "Patch windows" : when the window is opened,
>> 
>> people can submit patchsets. As it closed, people review it, fix
>> stuff, 
>> rebase code, and the branch is released. No new patchset comes at this
>> 
>> time. Then the window opens again and a new cycle starts. One
>> important 
>> point : the "master repo" is the git inside gerrit and no other. This
>> 
>> means that contributors would only fetch gerrithub to rebase their
>> work, 
>> github will then become a simple mirror.
>> Clearly, the "merge/fix/rebase" process is longer than a week. We
>> could 
>> work this way by simply abandon the one-week cycle we are accustomed
>> to. 
>> It's just a matter of using new, more adapted, rules and best
>> practises.
>> 
>>> 3a. The most extreme option would be to abandon incremental patches.
>> If you
>>> have a body of work for submission in a given week, you submit one
>> patch for
>>> that work.
>> Again, I believe that the one-week cycle is the real issue and it's
>> such 
>> a constraint for release management. You should open/close the 
>> submission window at your will. It would ease your work a lot,
>> wouldn't 
>> it ? Remember that gerrit was designed to help the release manager,
>> it's 
>> not designed to be that painful. We may just use the tool the wrong
>> way.
>> 
>>> 3c. A process implied by a post Matt found: Perform code review
>> with
>>> incremental patches. Once submission is ready, squash the submission
>> into a
>>> single patch and get final signoffs on that. Then the single patch
>> is
>>> merged.
>> People can rebase their patchset, even when submitted to gerrit and I
>> 
>> think they should keep the same changeid. Remember that changeid is 
>> nothing but a mark on a commit to allow gerrit to keep patchset
>> history. 
>> It's not a commit id.
>> 
>>> 
>>> If we proceed with gerrit, Malahal and Vincent will need to
>> re-submit their
>>> patches with new changeids
>> From my point of view, changing the changeids would clearly be a
>> misuse 
>> of gerrit.
>> 
>>> 1. We need more participation in review and verification on a timely
>> basis.
>> Yes. But the timeline can be refine.
>> 
>>> 2. We should make sure each patch that has significant impact in
>> areas the
>>> author may not be able to test is verified by someone who is able to
>> test
>>> that area, and then make sure we document that verification in the
>> review
>>> history (here is where gerrit COULD shine).
>> Gerrit can trigger automated tests (as it does with checkpatch.pl). 
>> Github does not (and so do not emails....)
>> 
>> 
>>> 3. It would be helpful to be able to identify one or two critical
>> reviewers
>>> for each patch, and then make sure those people are able to review
>> the
>>> patch.
>> Yes.
>> 
>>>  For those patches that may need more than a couple people to
>> review,
>>> we need to stage them at least a week ahead of when we expect them
>> to be
>>> merged, and then somehow flag those patches as high priority for
>> all
>>> required reviewers to actually review.
>> The question of timeline comes back again. That's clearly part of the
>> issue.
>> 
>> I am, and I always was, a partisan for using gerrit. I will go and
>> talk 
>> with my Lustre developers and will be back with a summary of the 
>> workflow use for Lustre with their private gerrit. This may be bring a
>> 
>> new set of information to the current discussion.
>> 
>>     Regards
>> 
>>         Philippe
>> 
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> 
> -- 
> Matt Benjamin
> CohortFS, LLC.
> 315 West Huron Street, Suite 140A
> Ann Arbor, Michigan 48103
> 
> http://cohortfs.com
> 
> tel.  734-761-4689 
> fax.  734-769-8938 
> cel.  734-216-5309 
> 
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> Performance metrics, stats and reports that give you Actionable Insights
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Should you have any further questions, please do not hesitate to come back us.

Kind Regards.
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One dashboard for servers and applications across Physical-Virtual-Cloud 
Widest out-of-the-box monitoring support with 50+ applications
Performance metrics, stats and reports that give you Actionable Insights
Deep dive visibility with transaction tracing using APM Insight.
http://ad.doubleclick.net/ddm/clk/290420510;117567292;y
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