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view tests/test-static-http.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 | 5abc47d4ca6b |
children | d5357238eda9 |
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#require no-reposimplestore $ hg clone http://localhost:$HGPORT/ copy abort: * (glob) [255] $ test -d copy [1] This server doesn't do range requests so it's basically only good for one pull $ "$PYTHON" "$TESTDIR/dumbhttp.py" -p $HGPORT --pid dumb.pid \ > --logfile server.log $ cat dumb.pid >> $DAEMON_PIDS $ hg init remote $ cd remote $ echo foo > bar $ echo c2 > '.dotfile with spaces' $ hg add adding .dotfile with spaces adding bar $ hg commit -m"test" $ hg tip changeset: 0:02770d679fb8 tag: tip user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: test $ cd .. $ hg clone static-http://localhost:$HGPORT/remote local requesting all changes adding changesets adding manifests adding file changes added 1 changesets with 2 changes to 2 files new changesets 02770d679fb8 updating to branch default 2 files updated, 0 files merged, 0 files removed, 0 files unresolved $ cd local $ hg verify checking changesets checking manifests crosschecking files in changesets and manifests checking files checked 1 changesets with 2 changes to 2 files $ cat bar foo $ cd ../remote $ echo baz > quux $ hg commit -A -mtest2 adding quux check for HTTP opener failures when cachefile does not exist $ rm .hg/cache/* $ cd ../local $ cat >> .hg/hgrc <<EOF > [hooks] > changegroup = sh -c "printenv.py changegroup" > EOF $ hg pull pulling from static-http://localhost:$HGPORT/remote searching for changes adding changesets adding manifests adding file changes added 1 changesets with 1 changes to 1 files new changesets 4ac2e3648604 changegroup hook: HG_HOOKNAME=changegroup HG_HOOKTYPE=changegroup HG_NODE=4ac2e3648604439c580c69b09ec9d93a88d93432 HG_NODE_LAST=4ac2e3648604439c580c69b09ec9d93a88d93432 HG_SOURCE=pull HG_TXNID=TXN:$ID$ HG_URL=http://localhost:$HGPORT/remote (run 'hg update' to get a working copy) trying to push $ hg update 1 files updated, 0 files merged, 0 files removed, 0 files unresolved $ echo more foo >> bar $ hg commit -m"test" $ hg push pushing to static-http://localhost:$HGPORT/remote abort: destination does not support push [255] trying clone -r $ cd .. $ hg clone -r doesnotexist static-http://localhost:$HGPORT/remote local0 abort: unknown revision 'doesnotexist'! [255] $ hg clone -r 0 static-http://localhost:$HGPORT/remote local0 adding changesets adding manifests adding file changes added 1 changesets with 2 changes to 2 files new changesets 02770d679fb8 updating to branch default 2 files updated, 0 files merged, 0 files removed, 0 files unresolved test with "/" URI (issue747) and subrepo $ hg init $ hg init sub $ touch sub/test $ hg -R sub commit -A -m "test" adding test $ hg -R sub tag not-empty $ echo sub=sub > .hgsub $ echo a > a $ hg add a .hgsub $ hg -q ci -ma $ hg clone static-http://localhost:$HGPORT/ local2 requesting all changes adding changesets adding manifests adding file changes added 1 changesets with 3 changes to 3 files new changesets a9ebfbe8e587 updating to branch default cloning subrepo sub from static-http://localhost:$HGPORT/sub requesting all changes adding changesets adding manifests adding file changes added 2 changesets with 2 changes to 2 files new changesets be090ea66256:322ea90975df 3 files updated, 0 files merged, 0 files removed, 0 files unresolved $ cd local2 $ hg verify checking changesets checking manifests crosschecking files in changesets and manifests checking files checked 1 changesets with 3 changes to 3 files checking subrepo links $ cat a a $ hg paths default = static-http://localhost:$HGPORT/ test with empty repo (issue965) $ cd .. $ hg init remotempty $ hg clone static-http://localhost:$HGPORT/remotempty local3 no changes found updating to branch default 0 files updated, 0 files merged, 0 files removed, 0 files unresolved $ cd local3 $ hg verify checking changesets checking manifests crosschecking files in changesets and manifests checking files checked 0 changesets with 0 changes to 0 files $ hg paths default = static-http://localhost:$HGPORT/remotempty test with non-repo $ cd .. $ mkdir notarepo $ hg clone static-http://localhost:$HGPORT/notarepo local3 abort: 'http://localhost:$HGPORT/notarepo' does not appear to be an hg repository! [255] Clone with tags and branches works $ hg init remote-with-names $ cd remote-with-names $ echo 0 > foo $ hg -q commit -A -m initial $ echo 1 > foo $ hg commit -m 'commit 1' $ hg -q up 0 $ hg branch mybranch marked working directory as branch mybranch (branches are permanent and global, did you want a bookmark?) $ echo 2 > foo $ hg commit -m 'commit 2 (mybranch)' $ hg tag -r 1 'default-tag' $ hg tag -r 2 'branch-tag' $ cd .. $ hg clone static-http://localhost:$HGPORT/remote-with-names local-with-names requesting all changes adding changesets adding manifests adding file changes added 5 changesets with 5 changes to 2 files (+1 heads) new changesets 68986213bd44:0c325bd2b5a7 updating to branch default 1 files updated, 0 files merged, 0 files removed, 0 files unresolved Clone a specific branch works $ hg clone -r mybranch static-http://localhost:$HGPORT/remote-with-names local-with-names-branch adding changesets adding manifests adding file changes added 4 changesets with 4 changes to 2 files new changesets 68986213bd44:0c325bd2b5a7 updating to branch mybranch 2 files updated, 0 files merged, 0 files removed, 0 files unresolved Clone a specific tag works $ hg clone -r default-tag static-http://localhost:$HGPORT/remote-with-names local-with-names-tag adding changesets adding manifests adding file changes added 2 changesets with 2 changes to 1 files new changesets 68986213bd44:4ee3fcef1c80 updating to branch default 1 files updated, 0 files merged, 0 files removed, 0 files unresolved $ killdaemons.py List of files accessed over HTTP: $ cat server.log | sed -n -e 's|.*GET \(/[^ ]*\).*|\1|p' | sort -u /.hg/bookmarks /.hg/bookmarks.current /.hg/cache/hgtagsfnodes1 /.hg/cache/rbc-names-v1 /.hg/cache/rbc-revs-v1 /.hg/requires /.hg/store/00changelog.i /.hg/store/00manifest.i /.hg/store/data/%7E2ehgsub.i /.hg/store/data/%7E2ehgsubstate.i /.hg/store/data/a.i /notarepo/.hg/00changelog.i /notarepo/.hg/requires /remote-with-names/.hg/bookmarks /remote-with-names/.hg/bookmarks.current /remote-with-names/.hg/cache/branch2-served /remote-with-names/.hg/cache/hgtagsfnodes1 /remote-with-names/.hg/cache/rbc-names-v1 /remote-with-names/.hg/cache/rbc-revs-v1 /remote-with-names/.hg/cache/tags2-served /remote-with-names/.hg/localtags /remote-with-names/.hg/requires /remote-with-names/.hg/store/00changelog.i /remote-with-names/.hg/store/00manifest.i /remote-with-names/.hg/store/data/%7E2ehgtags.i /remote-with-names/.hg/store/data/foo.i /remote/.hg/bookmarks /remote/.hg/bookmarks.current /remote/.hg/cache/branch2-base /remote/.hg/cache/branch2-immutable /remote/.hg/cache/branch2-served /remote/.hg/cache/hgtagsfnodes1 /remote/.hg/cache/rbc-names-v1 /remote/.hg/cache/rbc-revs-v1 /remote/.hg/cache/tags2-served /remote/.hg/localtags /remote/.hg/requires /remote/.hg/store/00changelog.i /remote/.hg/store/00manifest.i /remote/.hg/store/data/%7E2edotfile%20with%20spaces.i /remote/.hg/store/data/%7E2ehgtags.i /remote/.hg/store/data/bar.i /remote/.hg/store/data/quux.i /remotempty/.hg/bookmarks /remotempty/.hg/bookmarks.current /remotempty/.hg/requires /remotempty/.hg/store/00changelog.i /remotempty/.hg/store/00manifest.i /sub/.hg/bookmarks /sub/.hg/bookmarks.current /sub/.hg/cache/hgtagsfnodes1 /sub/.hg/cache/rbc-names-v1 /sub/.hg/cache/rbc-revs-v1 /sub/.hg/requires /sub/.hg/store/00changelog.i /sub/.hg/store/00manifest.i /sub/.hg/store/data/%7E2ehgtags.i /sub/.hg/store/data/test.i