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view tests/test-setdiscovery.t @ 32697:19b9fc40cc51
revlog: skeleton support for version 2 revlogs
There are a number of improvements we want to make to revlogs
that will require a new version - version 2. It is unclear what the
full set of improvements will be or when we'll be done with them.
What I do know is that the process will likely take longer than a
single release, will require input from various stakeholders to
evaluate changes, and will have many contentious debates and
bikeshedding.
It is unrealistic to develop revlog version 2 up front: there
are just too many uncertainties that we won't know until things
are implemented and experiments are run. Some changes will also
be invasive and prone to bit rot, so sitting on dozens of patches
is not practical.
This commit introduces skeleton support for version 2 revlogs in
a way that is flexible and not bound by backwards compatibility
concerns.
An experimental repo requirement for denoting revlog v2 has been
added. The requirement string has a sub-version component to it.
This will allow us to declare multiple requirements in the course
of developing revlog v2. Whenever we change the in-development
revlog v2 format, we can tweak the string, creating a new
requirement and locking out old clients. This will allow us to
make as many backwards incompatible changes and experiments to
revlog v2 as we want. In other words, we can land code and make
meaningful progress towards revlog v2 while still maintaining
extreme format flexibility up until the point we freeze the
format and remove the experimental labels.
To enable the new repo requirement, you must supply an experimental
and undocumented config option. But not just any boolean flag
will do: you need to explicitly use a value that no sane person
should ever type. This is an additional guard against enabling
revlog v2 on an installation it shouldn't be enabled on. The
specific scenario I'm trying to prevent is say a user with a
4.4 client with a frozen format enabling the option but then
downgrading to 4.3 and accidentally creating repos with an
outdated and unsupported repo format. Requiring a "challenge"
string should prevent this.
Because the format is not yet finalized and I don't want to take
any chances, revlog v2's version is currently 0xDEAD. I figure
squatting on a value we're likely never to use as an actual revlog
version to mean "internal testing only" is acceptable. And
"dead" is easily recognized as something meaningful.
There is a bunch of cleanup that is needed before work on revlog
v2 begins in earnest. I plan on doing that work once this patch
is accepted and we're comfortable with the idea of starting down
this path.
author | Gregory Szorc <gregory.szorc@gmail.com> |
---|---|
date | Fri, 19 May 2017 20:29:11 -0700 |
parents | a520aefb96f1 |
children | 43bda143e3b2 |
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Function to test discovery between two repos in both directions, using both the local shortcut (which is currently not activated by default) and the full remotable protocol: $ testdesc() { # revs_a, revs_b, dagdesc > if [ -d foo ]; then rm -rf foo; fi > hg init foo > cd foo > hg debugbuilddag "$3" > hg clone . a $1 --quiet > hg clone . b $2 --quiet > echo > echo "% -- a -> b tree" > hg -R a debugdiscovery b --verbose --old > echo > echo "% -- a -> b set" > hg -R a debugdiscovery b --verbose --debug --config progress.debug=true > echo > echo "% -- b -> a tree" > hg -R b debugdiscovery a --verbose --old --config > echo > echo "% -- b -> a set" > hg -R b debugdiscovery a --verbose --debug --config progress.debug=true > cd .. > } Small superset: $ testdesc '-ra1 -ra2' '-rb1 -rb2 -rb3' ' > +2:f +1:a1:b1 > <f +4 :a2 > +5 :b2 > <f +3 :b3' % -- a -> b tree comparing with b searching for changes unpruned common: 01241442b3c2 66f7d451a68b b5714e113bc0 common heads: 01241442b3c2 b5714e113bc0 local is subset % -- a -> b set comparing with b query 1; heads searching for changes all local heads known remotely common heads: 01241442b3c2 b5714e113bc0 local is subset % -- b -> a tree comparing with a searching for changes unpruned common: 01241442b3c2 b5714e113bc0 common heads: 01241442b3c2 b5714e113bc0 remote is subset % -- b -> a set comparing with a query 1; heads searching for changes all remote heads known locally common heads: 01241442b3c2 b5714e113bc0 remote is subset Many new: $ testdesc '-ra1 -ra2' '-rb' ' > +2:f +3:a1 +3:b > <f +30 :a2' % -- a -> b tree comparing with b searching for changes unpruned common: bebd167eb94d common heads: bebd167eb94d % -- a -> b set comparing with b query 1; heads searching for changes taking initial sample searching: 2 queries query 2; still undecided: 29, sample size is: 29 2 total queries common heads: bebd167eb94d % -- b -> a tree comparing with a searching for changes unpruned common: 66f7d451a68b bebd167eb94d common heads: bebd167eb94d % -- b -> a set comparing with a query 1; heads searching for changes taking initial sample searching: 2 queries query 2; still undecided: 2, sample size is: 2 2 total queries common heads: bebd167eb94d Both sides many new with stub: $ testdesc '-ra1 -ra2' '-rb' ' > +2:f +2:a1 +30 :b > <f +30 :a2' % -- a -> b tree comparing with b searching for changes unpruned common: 2dc09a01254d common heads: 2dc09a01254d % -- a -> b set comparing with b query 1; heads searching for changes taking initial sample searching: 2 queries query 2; still undecided: 29, sample size is: 29 2 total queries common heads: 2dc09a01254d % -- b -> a tree comparing with a searching for changes unpruned common: 2dc09a01254d 66f7d451a68b common heads: 2dc09a01254d % -- b -> a set comparing with a query 1; heads searching for changes taking initial sample searching: 2 queries query 2; still undecided: 29, sample size is: 29 2 total queries common heads: 2dc09a01254d Both many new: $ testdesc '-ra' '-rb' ' > +2:f +30 :b > <f +30 :a' % -- a -> b tree comparing with b searching for changes unpruned common: 66f7d451a68b common heads: 66f7d451a68b % -- a -> b set comparing with b query 1; heads searching for changes taking quick initial sample searching: 2 queries query 2; still undecided: 31, sample size is: 31 2 total queries common heads: 66f7d451a68b % -- b -> a tree comparing with a searching for changes unpruned common: 66f7d451a68b common heads: 66f7d451a68b % -- b -> a set comparing with a query 1; heads searching for changes taking quick initial sample searching: 2 queries query 2; still undecided: 31, sample size is: 31 2 total queries common heads: 66f7d451a68b Both many new skewed: $ testdesc '-ra' '-rb' ' > +2:f +30 :b > <f +50 :a' % -- a -> b tree comparing with b searching for changes unpruned common: 66f7d451a68b common heads: 66f7d451a68b % -- a -> b set comparing with b query 1; heads searching for changes taking quick initial sample searching: 2 queries query 2; still undecided: 51, sample size is: 51 2 total queries common heads: 66f7d451a68b % -- b -> a tree comparing with a searching for changes unpruned common: 66f7d451a68b common heads: 66f7d451a68b % -- b -> a set comparing with a query 1; heads searching for changes taking quick initial sample searching: 2 queries query 2; still undecided: 31, sample size is: 31 2 total queries common heads: 66f7d451a68b Both many new on top of long history: $ testdesc '-ra' '-rb' ' > +1000:f +30 :b > <f +50 :a' % -- a -> b tree comparing with b searching for changes unpruned common: 7ead0cba2838 common heads: 7ead0cba2838 % -- a -> b set comparing with b query 1; heads searching for changes taking quick initial sample searching: 2 queries query 2; still undecided: 1049, sample size is: 11 sampling from both directions searching: 3 queries query 3; still undecided: 31, sample size is: 31 3 total queries common heads: 7ead0cba2838 % -- b -> a tree comparing with a searching for changes unpruned common: 7ead0cba2838 common heads: 7ead0cba2838 % -- b -> a set comparing with a query 1; heads searching for changes taking quick initial sample searching: 2 queries query 2; still undecided: 1029, sample size is: 11 sampling from both directions searching: 3 queries query 3; still undecided: 15, sample size is: 15 3 total queries common heads: 7ead0cba2838 One with >200 heads, which used to use up all of the sample: $ hg init manyheads $ cd manyheads $ echo "+300:r @a" >dagdesc $ echo "*r+3*r+3*r+3*r+3*r+3*r+3*r+3*r+3*r+3*r+3 *r+3*r+3*r+3*r+3*r+3*r+3*r+3*r+3*r+3*r+3" >>dagdesc # 20 heads $ echo "*r+3*r+3*r+3*r+3*r+3*r+3*r+3*r+3*r+3*r+3 *r+3*r+3*r+3*r+3*r+3*r+3*r+3*r+3*r+3*r+3" >>dagdesc # 20 heads $ echo "*r+3*r+3*r+3*r+3*r+3*r+3*r+3*r+3*r+3*r+3 *r+3*r+3*r+3*r+3*r+3*r+3*r+3*r+3*r+3*r+3" >>dagdesc # 20 heads $ echo "*r+3*r+3*r+3*r+3*r+3*r+3*r+3*r+3*r+3*r+3 *r+3*r+3*r+3*r+3*r+3*r+3*r+3*r+3*r+3*r+3" >>dagdesc # 20 heads $ echo "*r+3*r+3*r+3*r+3*r+3*r+3*r+3*r+3*r+3*r+3 *r+3*r+3*r+3*r+3*r+3*r+3*r+3*r+3*r+3*r+3" >>dagdesc # 20 heads $ echo "*r+3*r+3*r+3*r+3*r+3*r+3*r+3*r+3*r+3*r+3 *r+3*r+3*r+3*r+3*r+3*r+3*r+3*r+3*r+3*r+3" >>dagdesc # 20 heads $ echo "*r+3*r+3*r+3*r+3*r+3*r+3*r+3*r+3*r+3*r+3 *r+3*r+3*r+3*r+3*r+3*r+3*r+3*r+3*r+3*r+3" >>dagdesc # 20 heads $ echo "*r+3*r+3*r+3*r+3*r+3*r+3*r+3*r+3*r+3*r+3 *r+3*r+3*r+3*r+3*r+3*r+3*r+3*r+3*r+3*r+3" >>dagdesc # 20 heads $ echo "*r+3*r+3*r+3*r+3*r+3*r+3*r+3*r+3*r+3*r+3 *r+3*r+3*r+3*r+3*r+3*r+3*r+3*r+3*r+3*r+3" >>dagdesc # 20 heads $ echo "*r+3*r+3*r+3*r+3*r+3*r+3*r+3*r+3*r+3*r+3 *r+3*r+3*r+3*r+3*r+3*r+3*r+3*r+3*r+3*r+3" >>dagdesc # 20 heads $ echo "*r+3*r+3*r+3*r+3*r+3*r+3*r+3*r+3*r+3*r+3 *r+3*r+3*r+3*r+3*r+3*r+3*r+3*r+3*r+3*r+3" >>dagdesc # 20 heads $ echo "*r+3*r+3*r+3*r+3*r+3*r+3*r+3*r+3*r+3*r+3 *r+3*r+3*r+3*r+3*r+3*r+3*r+3*r+3*r+3*r+3" >>dagdesc # 20 heads $ echo "*r+3*r+3*r+3*r+3*r+3*r+3*r+3*r+3*r+3*r+3 *r+3*r+3*r+3*r+3*r+3*r+3*r+3*r+3*r+3*r+3" >>dagdesc # 20 heads $ echo "@b *r+3" >>dagdesc # one more head $ hg debugbuilddag <dagdesc reading DAG from stdin $ hg heads -t --template . | wc -c \s*261 (re) $ hg clone -b a . a adding changesets adding manifests adding file changes added 1340 changesets with 0 changes to 0 files (+259 heads) updating to branch a 0 files updated, 0 files merged, 0 files removed, 0 files unresolved $ hg clone -b b . b adding changesets adding manifests adding file changes added 304 changesets with 0 changes to 0 files updating to branch b 0 files updated, 0 files merged, 0 files removed, 0 files unresolved $ hg -R a debugdiscovery b --debug --verbose --config progress.debug=true comparing with b query 1; heads searching for changes taking quick initial sample searching: 2 queries query 2; still undecided: 1240, sample size is: 100 sampling from both directions searching: 3 queries query 3; still undecided: 1140, sample size is: 200 sampling from both directions searching: 4 queries query 4; still undecided: \d+, sample size is: 200 (re) sampling from both directions searching: 5 queries query 5; still undecided: \d+, sample size is: 200 (re) sampling from both directions searching: 6 queries query 6; still undecided: \d+, sample size is: \d+ (re) 6 total queries common heads: 3ee37d65064a Test actual protocol when pulling one new head in addition to common heads $ hg clone -U b c $ hg -R c id -ir tip 513314ca8b3a $ hg -R c up -qr default $ touch c/f $ hg -R c ci -Aqm "extra head" $ hg -R c id -i e64a39e7da8b $ hg serve -R c -p $HGPORT -d --pid-file=hg.pid -A access.log -E errors.log $ cat hg.pid >> $DAEMON_PIDS $ hg -R b incoming http://localhost:$HGPORT/ -T '{node|short}\n' comparing with http://localhost:$HGPORT/ searching for changes e64a39e7da8b $ killdaemons.py $ cut -d' ' -f6- access.log | grep -v cmd=known # cmd=known uses random sampling "GET /?cmd=capabilities HTTP/1.1" 200 - "GET /?cmd=batch HTTP/1.1" 200 - x-hgarg-1:cmds=heads+%3Bknown+nodes%3D513314ca8b3ae4dac8eec56966265b00fcf866db x-hgproto-1:0.1 0.2 comp=*zlib,none,bzip2 (glob) "GET /?cmd=getbundle HTTP/1.1" 200 - x-hgarg-1:bundlecaps=HG20%2Cbundle2%3DHG20%250Achangegroup%253D01%252C02%250Adigests%253Dmd5%252Csha1%252Csha512%250Aerror%253Dabort%252Cunsupportedcontent%252Cpushraced%252Cpushkey%250Ahgtagsfnodes%250Alistkeys%250Apushkey%250Aremote-changegroup%253Dhttp%252Chttps&cg=1&common=513314ca8b3ae4dac8eec56966265b00fcf866db&heads=e64a39e7da8b0d54bc63e81169aff001c13b3477 x-hgproto-1:0.1 0.2 comp=*zlib,none,bzip2 (glob) "GET /?cmd=listkeys HTTP/1.1" 200 - x-hgarg-1:namespace=phases x-hgproto-1:0.1 0.2 comp=*zlib,none,bzip2 (glob) $ cat errors.log $ cd .. Issue 4438 - test coverage for 3ef893520a85 issues. $ mkdir issue4438 $ cd issue4438 #if false generate new bundles: $ hg init r1 $ for i in `python $TESTDIR/seq.py 101`; do hg -R r1 up -qr null && hg -R r1 branch -q b$i && hg -R r1 ci -qmb$i; done $ hg clone -q r1 r2 $ for i in `python $TESTDIR/seq.py 10`; do hg -R r1 up -qr null && hg -R r1 branch -q c$i && hg -R r1 ci -qmc$i; done $ hg -R r2 branch -q r2change && hg -R r2 ci -qmr2change $ hg -R r1 bundle -qa $TESTDIR/bundles/issue4438-r1.hg $ hg -R r2 bundle -qa $TESTDIR/bundles/issue4438-r2.hg #else use existing bundles: $ hg clone -q $TESTDIR/bundles/issue4438-r1.hg r1 $ hg clone -q $TESTDIR/bundles/issue4438-r2.hg r2 #endif Set iteration order could cause wrong and unstable results - fixed in 73cfaa348650: $ hg -R r1 outgoing r2 -T'{rev} ' comparing with r2 searching for changes 101 102 103 104 105 106 107 108 109 110 (no-eol) The case where all the 'initialsamplesize' samples already were common would give 'all remote heads known locally' without checking the remaining heads - fixed in 86c35b7ae300: $ cat >> $TESTTMP/unrandomsample.py << EOF > import random > def sample(population, k): > return sorted(population)[:k] > random.sample = sample > EOF $ cat >> r1/.hg/hgrc << EOF > [extensions] > unrandomsample = $TESTTMP/unrandomsample.py > EOF $ hg -R r1 outgoing r2 -T'{rev} ' comparing with r2 searching for changes 101 102 103 104 105 106 107 108 109 110 (no-eol) $ cd ..