view contrib/all-revsets.txt @ 39632:c1aacb0d76ff

wireprotov2: add phases to "changesetdata" command

This commit teaches the "changesetdata" wire protocol command
to emit the phase state for each changeset.

This is a different approach from existing phase transfer in a
few ways. Previously, if there are no new revisions (or we're
not using bundle2), we perform a "listkeys" request to retrieve
phase heads. And when revision data is being transferred
with bundle2, phases data is encoded in a standalone bundle2 part.
In both cases, phases data is logically decoupled from the changeset
data and is encountered/applied after changeset revision data
is received.

The new wire protocol purposefully tries to more tightly associate
changeset metadata (phases, bookmarks, obsolescence markers, etc)
with the changeset revision and index data itself, rather than
have it live as a separate entity that must be fetched and
processed separately. I reckon that one reason we didn't do this
before was it was difficult to add new data types/fields without
breaking existing consumers. By using CBOR maps to transfer
changeset data and putting clients in control of what fields are
requested / present in those maps, we can easily add additional
changeset data while maintaining backwards compatibility. I believe
this to be a superior approach to the problem.

That being said, for performance reasons, we may need to resort
to alternative mechanisms for transferring data like phases. But
for now, I think giving the wire protocol the ability to transfer
changeset metadata next to the changeset itself is a powerful feature
because it is a raw, changeset-centric data API. And if you build
simple APIs for accessing the fundamental units of repository data,
you enable client-side experimentation (partial clone, etc). If it
turns out that we need specialized APIs or mechanisms for transferring
data like phases, we can build in those APIs later. For now, I'd
like to see how far we can get on simple APIs.

It's worth noting that when phase data is being requested, the
server will also emit changeset records for nodes in the bases
specified by the "noderange" argument. This is to ensure that
phase-only updates for nodes the client has are available to the
client, even if no new changesets will be transferred.

Differential Revision: https://phab.mercurial-scm.org/D4483

# All revsets ever used with revsetbenchmarks.py script
#
# The goal of this file is to gather all revsets ever used for benchmarking
# revset's performance. It should be used to gather revsets that test a
# specific usecase or a specific implementation of revset predicates.
# If you are working on the smartset implementation itself, check
# 'base-revsets.txt'.
#
# Please update this file with any revsets you use for benchmarking a change so
# that future contributors can easily find and retest it when doing further
# modification. Feel free to highlight interesting variants if needed.


## Revset from this section are all extracted from changelog when this file was
# created. Feel free to dig and improve documentation.

# Used in revision da05fe01170b
(20000::) - (20000)
# Used in revision 95af98616aa7
parents(20000)
# Used in revision 186fd06283b4
(_intlist('20000\x0020001')) and merge()
# Used in revision 911f5a6579d1
p1(20000)
p2(10000)
# Used in revision b6dc3b79bb25
0::
# Used in revision faf4f63533ff
bookmark()
# Used in revision 22ba2c0825da
tip~25
# Used in revision 0cf46b8298fe
bisect(range)
# Used in revision 5b65429721d5
divergent()
# Used in revision 6261b9c549a2
file(COPYING)
# Used in revision 44f471102f3a
follow(COPYING)
# Used in revision 8040a44aab1c
origin(tip)
# Used in revision bbf4f3dfd700
rev(25)
# Used in revision a428db9ab61d
p1()
# Used in revision c1546d7400ef
min(0::)
# Used in revision 546fa6576815
author(lmoscovicz) or author(mpm)
author(mpm) or author(lmoscovicz)
# Used in revision 9bfe68357c01
public() and id("d82e2223f132")
# Used in revision ba89f7b542c9
rev(25)
# Used in revision eb763217152a
rev(210000)
# Used in revision 69524a05a7fa
10:100
parents(10):parents(100)
# Used in revision 6f1b8b3f12fd
100~5
parents(100)~5
(100~5)~5
# Used in revision 7a42e5d4c418
children(tip~100)
# Used in revision 7e8737e6ab08
100^1
parents(100)^1
(100^1)^1
# Used in revision 30e0dcd7c5ff
matching(100)
matching(parents(100))
# Used in revision aafeaba22826
0|1|2|3|4|5|6|7|8|9
# Used in revision 33c7a94d4dd0
tip:0
# Used in revision 7d369fae098e
(0:100000)
# Used in revision b333ca94403d
0 + 1 + 2 + ... + 200
0 + 1 + 2 + ... + 1000
sort(0 + 1 + 2 + ... + 200)
sort(0 + 1 + 2 + ... + 1000)
# Used in revision 7fbef7932af9
first(0 + 1 + 2 + ... + 1000)
# Used in revision ceaf04bb14ff
0:1000
# Used in revision 262e6ad93885
not public()
(tip~1000::) - public()
not public() and branch("default")
# Used in revision 15412bba5a68
0::tip

## all the revsets from this section have been taken from the former central file
# for revset's benchmarking, they are undocumented for this reason.
all()
draft()
::tip
draft() and ::tip
::tip and draft()
author(lmoscovicz)
author(mpm)
::p1(p1(tip))::
public()
:10000 and public()
:10000 and draft()
(not public() - obsolete())

# The one below is used by rebase
(children(ancestor(tip~5, tip)) and ::(tip~5))::

# those two `roots(...)` inputs are close to what phase movement use.
roots((tip~100::) - (tip~100::tip))
roots((0::) - (0::tip))

# more roots testing
roots(tip~100:)
roots(:42)
roots(not public())
roots((0:tip)::)
roots(0::tip)
42:68 and roots(42:tip)
# Used in revision f140d6207cca
roots(0:tip)
# test disjoint set with multiple roots
roots((:42) + (tip~42:))

# Testing the behavior of "head()" in various situations
head()
head() - public()
draft() and head()
head() and author("mpm")

# testing the mutable phases set
draft()
secret()

# test finding common ancestors
heads(commonancestors(last(head(), 2)))
heads(commonancestors(head()))