Mercurial > hg
view tests/test-init.t @ 40326:fed697fa1734
sqlitestore: file storage backend using SQLite
This commit provides an extension which uses SQLite to store file
data (as opposed to revlogs).
As the inline documentation describes, there are still several
aspects to the extension that are incomplete. But it's a start.
The extension does support basic clone, checkout, and commit
workflows, which makes it suitable for simple use cases.
One notable missing feature is support for "bundlerepos." This is
probably responsible for the most test failures when the extension
is activated as part of the test suite.
All revision data is stored in SQLite. Data is stored as zstd
compressed chunks (default if zstd is available), zlib compressed
chunks (default if zstd is not available), or raw chunks (if
configured or if a compressed delta is not smaller than the raw
delta). This makes things very similar to revlogs.
Unlike revlogs, the extension doesn't yet enforce a limit on delta
chain length. This is an obvious limitation and should be addressed.
This is somewhat mitigated by the use of zstd, which is much faster
than zlib to decompress.
There is a dedicated table for storing deltas. Deltas are stored
by the SHA-1 hash of their uncompressed content. The "fileindex" table
has columns that reference the delta for each revision and the base
delta that delta should be applied against. A recursive SQL query
is used to resolve the delta chain along with the delta data.
By storing deltas by hash, we are able to de-duplicate delta storage!
With revlogs, the same deltas in different revlogs would result in
duplicate storage of that delta. In this scheme, inserting the
duplicate delta is a no-op and delta chains simply reference the
existing delta.
When initially implementing this extension, I did not have
content-indexed deltas and deltas could be duplicated across files
(just like revlogs). When I implemented content-indexed deltas, the
size of the SQLite database for a full clone of mozilla-unified
dropped:
before: 2,554,261,504 bytes
after: 2,488,754,176 bytes
Surprisingly, this is still larger than the bytes size of revlog
files:
revlog files: 2,104,861,230 bytes
du -b: 2,254,381,614
I would have expected storage to be smaller since we're not limiting
delta chain length and since we're using zstd instead of zlib. I
suspect the SQLite indexes and per-column overhead account for the
bulk of the differences. (Keep in mind that revlog uses a 64-byte
packed struct for revision index data and deltas are stored without
padding. Aside from the 12 unused bytes in the 32 byte node field,
revlogs are pretty efficient.) Another source of overhead is file
name storage. With revlogs, file names are stored in the filesystem.
But with SQLite, we need to store file names in the database. This is
roughly equivalent to the size of the fncache file, which for the
mozilla-unified repository is ~34MB.
Since the SQLite database isn't append-only and since delta chains
can reference any delta, this opens some interesting possibilities.
For example, we could store deltas in reverse, such that fulltexts
are stored for newer revisions and deltas are applied to reconstruct
older revisions. This is likely a more optimal storage strategy for
version control, as new data tends to be more frequently accessed
than old data. We would obviously need wire protocol support for
transferring revision data from newest to oldest. And we would
probably need some kind of mechanism for "re-encoding" stores. But
it should be doable.
This extension is very much experimental quality. There are a handful
of features that don't work. It probably isn't suitable for day-to-day
use. But it could be used in limited cases (e.g. read-only checkouts
like in CI). And it is also a good proving ground for alternate
storage backends. As we continue to define interfaces for all things
storage, it will be useful to have a viable alternate storage backend
to see how things shake out in practice.
test-storage.py passes on Python 2 and introduces no new test failures on
Python 3. Having the storage-level unit tests has proved to be insanely
useful when developing this extension. Those tests caught numerous bugs
during development and I'm convinced this style of testing is the way
forward for ensuring alternate storage backends work as intended. Of
course, test coverage isn't close to what it needs to be. But it is
a start. And what coverage we have gives me confidence that basic store
functionality is implemented properly.
Differential Revision: https://phab.mercurial-scm.org/D4928
author | Gregory Szorc <gregory.szorc@gmail.com> |
---|---|
date | Tue, 09 Oct 2018 08:50:13 -0700 |
parents | c2c8962a9465 |
children | 57e4150fb15b |
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This test tries to exercise the ssh functionality with a dummy script $ checknewrepo() > { > name=$1 > if [ -d "$name"/.hg/store ]; then > echo store created > fi > if [ -f "$name"/.hg/00changelog.i ]; then > echo 00changelog.i created > fi > cat "$name"/.hg/requires > } creating 'local' $ hg init local $ checknewrepo local store created 00changelog.i created dotencode fncache generaldelta revlogv1 store testonly-simplestore (reposimplestore !) $ echo this > local/foo $ hg ci --cwd local -A -m "init" adding foo test custom revlog chunk cache sizes $ hg --config format.chunkcachesize=0 log -R local -pv abort: revlog chunk cache size 0 is not greater than 0! [255] $ hg --config format.chunkcachesize=1023 log -R local -pv abort: revlog chunk cache size 1023 is not a power of 2! [255] $ hg --config format.chunkcachesize=1024 log -R local -pv changeset: 0:08b9e9f63b32 tag: tip user: test date: Thu Jan 01 00:00:00 1970 +0000 files: foo description: init diff -r 000000000000 -r 08b9e9f63b32 foo --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/foo Thu Jan 01 00:00:00 1970 +0000 @@ -0,0 +1,1 @@ +this creating repo with format.usestore=false $ hg --config format.usestore=false init old $ checknewrepo old generaldelta revlogv1 testonly-simplestore (reposimplestore !) creating repo with format.usefncache=false $ hg --config format.usefncache=false init old2 $ checknewrepo old2 store created 00changelog.i created generaldelta revlogv1 store testonly-simplestore (reposimplestore !) creating repo with format.dotencode=false $ hg --config format.dotencode=false init old3 $ checknewrepo old3 store created 00changelog.i created fncache generaldelta revlogv1 store testonly-simplestore (reposimplestore !) creating repo with format.dotencode=false $ hg --config format.generaldelta=false --config format.usegeneraldelta=false init old4 $ checknewrepo old4 store created 00changelog.i created dotencode fncache revlogv1 store testonly-simplestore (reposimplestore !) test failure $ hg init local abort: repository local already exists! [255] init+push to remote2 $ hg init -e "\"$PYTHON\" \"$TESTDIR/dummyssh\"" ssh://user@dummy/remote2 $ hg incoming -R remote2 local comparing with local changeset: 0:08b9e9f63b32 tag: tip user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: init $ hg push -R local -e "\"$PYTHON\" \"$TESTDIR/dummyssh\"" ssh://user@dummy/remote2 pushing to ssh://user@dummy/remote2 searching for changes remote: adding changesets remote: adding manifests remote: adding file changes remote: added 1 changesets with 1 changes to 1 files clone to remote1 $ hg clone -e "\"$PYTHON\" \"$TESTDIR/dummyssh\"" local ssh://user@dummy/remote1 searching for changes remote: adding changesets remote: adding manifests remote: adding file changes remote: added 1 changesets with 1 changes to 1 files The largefiles extension doesn't crash $ hg clone -e "\"$PYTHON\" \"$TESTDIR/dummyssh\"" local ssh://user@dummy/remotelf --config extensions.largefiles= The fsmonitor extension is incompatible with the largefiles extension and has been disabled. (fsmonitor !) The fsmonitor extension is incompatible with the largefiles extension and has been disabled. (fsmonitor !) searching for changes remote: adding changesets remote: adding manifests remote: adding file changes remote: added 1 changesets with 1 changes to 1 files init to existing repo $ hg init -e "\"$PYTHON\" \"$TESTDIR/dummyssh\"" ssh://user@dummy/remote1 abort: repository remote1 already exists! abort: could not create remote repo! [255] clone to existing repo $ hg clone -e "\"$PYTHON\" \"$TESTDIR/dummyssh\"" local ssh://user@dummy/remote1 abort: repository remote1 already exists! abort: could not create remote repo! [255] output of dummyssh $ cat dummylog Got arguments 1:user@dummy 2:hg init remote2 Got arguments 1:user@dummy 2:hg -R remote2 serve --stdio Got arguments 1:user@dummy 2:hg -R remote2 serve --stdio Got arguments 1:user@dummy 2:hg init remote1 Got arguments 1:user@dummy 2:hg -R remote1 serve --stdio Got arguments 1:user@dummy 2:hg init remotelf Got arguments 1:user@dummy 2:hg -R remotelf serve --stdio Got arguments 1:user@dummy 2:hg init remote1 Got arguments 1:user@dummy 2:hg init remote1 comparing repositories $ hg tip -q -R local 0:08b9e9f63b32 $ hg tip -q -R remote1 0:08b9e9f63b32 $ hg tip -q -R remote2 0:08b9e9f63b32 check names for repositories (clashes with URL schemes, special chars) $ for i in bundle file hg http https old-http ssh static-http "with space"; do > printf "hg init \"$i\"... " > hg init "$i" > test -d "$i" -a -d "$i/.hg" && echo "ok" || echo "failed" > done hg init "bundle"... ok hg init "file"... ok hg init "hg"... ok hg init "http"... ok hg init "https"... ok hg init "old-http"... ok hg init "ssh"... ok hg init "static-http"... ok hg init "with space"... ok #if eol-in-paths /* " " is not a valid name for a directory on Windows */ $ hg init " " $ test -d " " $ test -d " /.hg" #endif creating 'local/sub/repo' $ hg init local/sub/repo $ checknewrepo local/sub/repo store created 00changelog.i created dotencode fncache generaldelta revlogv1 store testonly-simplestore (reposimplestore !) prepare test of init of url configured from paths $ echo '[paths]' >> $HGRCPATH $ echo "somewhere = `pwd`/url from paths" >> $HGRCPATH $ echo "elsewhere = `pwd`/another paths url" >> $HGRCPATH init should (for consistency with clone) expand the url $ hg init somewhere $ checknewrepo "url from paths" store created 00changelog.i created dotencode fncache generaldelta revlogv1 store testonly-simplestore (reposimplestore !) verify that clone also expand urls $ hg clone somewhere elsewhere updating to branch default 0 files updated, 0 files merged, 0 files removed, 0 files unresolved $ checknewrepo "another paths url" store created 00changelog.i created dotencode fncache generaldelta revlogv1 store testonly-simplestore (reposimplestore !) clone bookmarks $ hg -R local bookmark test $ hg -R local bookmarks * test 0:08b9e9f63b32 $ hg clone -e "\"$PYTHON\" \"$TESTDIR/dummyssh\"" local ssh://user@dummy/remote-bookmarks searching for changes remote: adding changesets remote: adding manifests remote: adding file changes remote: added 1 changesets with 1 changes to 1 files exporting bookmark test $ hg -R remote-bookmarks bookmarks test 0:08b9e9f63b32