From: Michael Haggerty <mhagger@alum.mit.edu>
To: Junio C Hamano <gitster@pobox.com>
Cc: "David Turner" <novalis@novalis.org>,
"Ramsay Jones" <ramsay@ramsayjones.plus.com>,
"Eric Sunshine" <sunshine@sunshineco.com>,
"Jeff King" <peff@peff.net>,
"Nguyễn Thái Ngọc Duy" <pclouds@gmail.com>,
git@vger.kernel.org
Subject: Re: [PATCH v2 00/38] Virtualization of the refs API
Date: Thu, 8 Sep 2016 08:42:08 +0200 [thread overview]
Message-ID: <7aac9c43-b8fc-c6fa-6311-4ff7a5495464@alum.mit.edu> (raw)
In-Reply-To: <xmqqmvjjldp2.fsf@gitster.mtv.corp.google.com>
On 09/07/2016 09:20 PM, Junio C Hamano wrote:
> Michael Haggerty <mhagger@alum.mit.edu> writes:
>
>> This is v2 of the patch series to virtualize the references API
>> (though earlier patch series similar in spirit were submitted by
>> Ronnie Sahlberg and David Turner). Thanks to Junio, Eric, and Ramsay
>> for their comments about v1 [1].
>>
>> Nobody pointed out any fundamental problems with v1, but this version
>> includes the following improvements:
>
> Curiously, many of these improvements were already in 'pu'.
I pushed some of these changes to GitHub a while ago and mentioned that
fact on the mailing list [1]; I assume you fetched from there. But I was
waiting for the dust to settle from the earlier patch series and the
2.10 release before sending them to the mailing list again.
>> * In "refs: add methods for reflog":
>>
>> * Don't export `files_reflog_iterator_begin()` (suggested by
>> Ramsay).
>
> This I can see was missing in what has been in 'pu'.
And according to your "What's cooking", you were waiting on this change
before proceeding.
FYI: I haven't done significant work on any next steps, which IMO could
go in many possible directions:
* Splitting loose and packed refs storage into two separate ref_store
subclasses that are joined together using some kind of
overlay_ref_store. This is not necessarily a blocker for the following
ideas, but the overlay_ref_store would make it easier to construct other
hybrid ref-stores, as for example the ubiquitous "most references are
stored in main repo; per-worktree refs are stored in worktree".
* Implementing reference caching as a ref_store that "writes through"
changes to a backing reference store. This is also not a blocker for
other ideas, but it would allow reference caching easily to be turned
on/off for other reference stores (or even disabled for packed/loose
reference storage during command invocations that know they won't have
to iterate over references more than once).
* A variant of loose reference storage that encodes the reference names
somehow before turning them into filenames (1) to make refnames
independent of filesystem path-name encoding issues, and (2) to
eliminate D/F conflicts, thereby allowing reflogs to be retained after a
reference is deleted.
* A reference backend based on LMDB (or any other key-value store).
* A reference backend based on Shawn Pearce's RefTree proposal or
something like it [2].
It's uncertain when I'll next have a chunk of time to work on any of these.
Michael
[1] http://public-inbox.org/git/575990FB.5000908@alum.mit.edu/
[2]
http://public-inbox.org/git/CAJo=hJvnAPNAdDcAAwAvU9C4RVeQdoS3Ev9WTguHx4fD0V_nOg@mail.gmail.com/t
prev parent reply other threads:[~2016-09-08 6:42 UTC|newest]
Thread overview: 49+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-09-04 16:08 [PATCH v2 00/38] Virtualization of the refs API Michael Haggerty
2016-09-04 16:08 ` [PATCH v2 01/38] resolve_gitlink_ref(): eliminate temporary variable Michael Haggerty
2016-09-04 16:08 ` [PATCH v2 02/38] rename_ref_available(): add docstring Michael Haggerty
2016-09-06 14:25 ` Jakub Narębski
2016-09-07 4:32 ` Michael Haggerty
2016-09-04 16:08 ` [PATCH v2 03/38] refs: rename struct ref_cache to files_ref_store Michael Haggerty
2016-09-04 16:08 ` [PATCH v2 04/38] refs: add a backend method structure Michael Haggerty
2016-09-04 19:43 ` David Turner
2016-09-04 16:08 ` [PATCH v2 05/38] refs: create a base class "ref_store" for files_ref_store Michael Haggerty
2016-09-04 20:40 ` David Turner
2016-09-05 3:53 ` Michael Haggerty
2016-09-05 5:17 ` Stefan Beller
2016-09-05 16:16 ` David Turner
2016-09-04 16:08 ` [PATCH v2 06/38] add_packed_ref(): add a files_ref_store argument Michael Haggerty
2016-09-04 16:08 ` [PATCH v2 07/38] get_packed_ref(): " Michael Haggerty
2016-09-04 16:08 ` [PATCH v2 08/38] resolve_missing_loose_ref(): " Michael Haggerty
2016-09-04 16:08 ` [PATCH v2 09/38] {lock,commit,rollback}_packed_refs(): add files_ref_store arguments Michael Haggerty
2016-09-04 16:08 ` [PATCH v2 10/38] refs: add a transaction_commit() method Michael Haggerty
2016-09-04 16:08 ` [PATCH v2 11/38] refs: reorder definitions Michael Haggerty
2016-09-04 16:08 ` [PATCH v2 12/38] resolve_packed_ref(): rename function from resolve_missing_loose_ref() Michael Haggerty
2016-09-04 16:08 ` [PATCH v2 13/38] resolve_gitlink_packed_ref(): remove function Michael Haggerty
2016-09-04 16:08 ` [PATCH v2 14/38] read_raw_ref(): take a (struct ref_store *) argument Michael Haggerty
2016-09-04 16:08 ` [PATCH v2 15/38] resolve_ref_recursively(): new function Michael Haggerty
2016-09-04 16:08 ` [PATCH v2 16/38] resolve_gitlink_ref(): implement using resolve_ref_recursively() Michael Haggerty
2016-09-04 16:08 ` [PATCH v2 17/38] resolve_gitlink_ref(): avoid memory allocation in many cases Michael Haggerty
2016-09-04 16:08 ` [PATCH v2 18/38] resolve_gitlink_ref(): rename path parameter to submodule Michael Haggerty
2016-09-04 16:08 ` [PATCH v2 19/38] refs: make read_raw_ref() virtual Michael Haggerty
2016-09-04 16:08 ` [PATCH v2 20/38] refs: make verify_refname_available() virtual Michael Haggerty
2016-09-04 16:08 ` [PATCH v2 21/38] refs: make pack_refs() virtual Michael Haggerty
2016-09-04 16:08 ` [PATCH v2 22/38] refs: make create_symref() virtual Michael Haggerty
2016-09-04 16:08 ` [PATCH v2 23/38] refs: make peel_ref() virtual Michael Haggerty
2016-09-04 16:08 ` [PATCH v2 24/38] repack_without_refs(): add a files_ref_store argument Michael Haggerty
2016-09-04 16:08 ` [PATCH v2 25/38] lock_raw_ref(): " Michael Haggerty
2016-09-04 16:08 ` [PATCH v2 26/38] commit_ref_update(): " Michael Haggerty
2016-09-04 16:08 ` [PATCH v2 27/38] lock_ref_for_update(): " Michael Haggerty
2016-09-04 16:08 ` [PATCH v2 28/38] lock_ref_sha1_basic(): " Michael Haggerty
2016-09-04 16:08 ` [PATCH v2 29/38] split_symref_update(): " Michael Haggerty
2016-09-04 16:08 ` [PATCH v2 30/38] files_ref_iterator_begin(): take a ref_store argument Michael Haggerty
2016-09-04 16:08 ` [PATCH v2 31/38] refs: add method iterator_begin Michael Haggerty
2016-09-04 16:08 ` [PATCH v2 32/38] refs: add methods for reflog Michael Haggerty
2016-09-04 16:08 ` [PATCH v2 33/38] refs: add method for initial ref transaction commit Michael Haggerty
2016-09-04 16:08 ` [PATCH v2 34/38] refs: make delete_refs() virtual Michael Haggerty
2016-09-04 16:08 ` [PATCH v2 35/38] refs: add methods to init refs db Michael Haggerty
2016-09-04 16:08 ` [PATCH v2 36/38] refs: add method to rename refs Michael Haggerty
2016-09-04 16:08 ` [PATCH v2 37/38] refs: make lock generic Michael Haggerty
2016-09-04 16:08 ` [PATCH v2 38/38] refs: implement iteration over only per-worktree refs Michael Haggerty
2016-09-08 21:45 ` David Turner
2016-09-07 19:20 ` [PATCH v2 00/38] Virtualization of the refs API Junio C Hamano
2016-09-08 6:42 ` Michael Haggerty [this message]
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