Mercurial > hg
changeset 28240:1ac8ce137377
changegroup: fix treemanifests on merges
The current code for generating treemanifest revisions takes the list
of files in the changeset and finds the directories from them. This
does not work for merges, since a merge may pick file A from one side
and file B from another and neither of them would appear in the
changeset's "files" list, but the manifest would still change.
Fix this by instead walking the root manifest log for all needed
revisions, storing all needed file and subdirectory revisions, then
recursively visiting the subdirectories. This also turns out to be
faster: cloning a version of hg core converted to treemanifests went
from ~28s to ~19s (timing somewhat unfair: before this patch, timed
until crash; after this patch, timed until manifests complete).
The new algorithm is used only on treemanifest repos. Although it
works equally well on flat manifests, we leave the iteration over
files in the changeset for flat manifests for now.
| author | Martin von Zweigbergk <martinvonz@google.com> |
|---|---|
| date | Fri, 12 Feb 2016 23:09:09 -0800 |
| parents | 7279e0132347 |
| children | a4286175ecba |
| files | mercurial/changegroup.py mercurial/manifest.py tests/test-treemanifest.t |
| diffstat | 3 files changed, 49 insertions(+), 59 deletions(-) [+] |
line wrap: on
line diff
--- a/mercurial/changegroup.py Sun Dec 27 20:21:37 2015 +0900 +++ b/mercurial/changegroup.py Fri Feb 12 23:09:09 2016 -0800 @@ -553,27 +553,6 @@ return d return readexactly(self._fh, n) -def _moddirs(files): - """Given a set of modified files, find the list of modified directories. - - This returns a list of (path to changed dir, changed dir) tuples, - as that's what the one client needs anyway. - - >>> _moddirs(['a/b/c.py', 'a/b/c.txt', 'a/d/e/f/g.txt', 'i.txt', ]) - [('/', 'a/'), ('a/', 'b/'), ('a/', 'd/'), ('a/d/', 'e/'), ('a/d/e/', 'f/')] - - """ - alldirs = set() - for f in files: - path = f.split('/')[:-1] - for i in xrange(len(path) - 1, -1, -1): - dn = '/'.join(path[:i]) - current = dn + '/', path[i] + '/' - if current in alldirs: - break - alldirs.add(current) - return sorted(alldirs) - class cg1packer(object): deltaheader = _CHANGEGROUPV1_DELTA_HEADER version = '01' @@ -755,7 +734,7 @@ def generatemanifests(self, commonrevs, clrevorder, fastpathlinkrev, mfs, mfchangedfiles, fnodes): repo = self._repo - ml = repo.manifest + dirlog = repo.manifest.dirlog tmfnodes = {'': mfs} # Callback for the manifest, used to collect linkrevs for filelog @@ -766,9 +745,6 @@ assert not dir return mfs.__getitem__ - if dir: - return tmfnodes[dir].get - def lookupmflinknode(x): """Callback for looking up the linknode for manifests. @@ -785,43 +761,34 @@ the client before you can trust the list of files and treemanifests to send. """ - clnode = mfs[x] - # We no longer actually care about reading deltas of - # the manifest here, because we already know the list - # of changed files, so for treemanifests (which - # lazily-load anyway to *generate* a readdelta) we can - # just load them with read() and then we'll actually - # be able to correctly load node IDs from the - # submanifest entries. + clnode = tmfnodes[dir][x] + mdata = dirlog(dir).readshallowfast(x) if 'treemanifest' in repo.requirements: - mdata = ml.read(x) + for p, n, fl in mdata.iterentries(): + if fl == 't': # subdirectory manifest + subdir = dir + p + '/' + tmfclnodes = tmfnodes.setdefault(subdir, {}) + tmfclnode = tmfclnodes.setdefault(n, clnode) + if clrevorder[clnode] < clrevorder[tmfclnode]: + tmfclnodes[n] = clnode + else: + f = dir + p + fclnodes = fnodes.setdefault(f, {}) + fclnode = fclnodes.setdefault(n, clnode) + if clrevorder[clnode] < clrevorder[fclnode]: + fclnodes[n] = clnode else: - mdata = ml.readfast(x) - for f in mfchangedfiles[x]: - try: - n = mdata[f] - except KeyError: - continue - # record the first changeset introducing this filelog - # version - fclnodes = fnodes.setdefault(f, {}) - fclnode = fclnodes.setdefault(n, clnode) - if clrevorder[clnode] < clrevorder[fclnode]: - fclnodes[n] = clnode - # gather list of changed treemanifest nodes - if 'treemanifest' in repo.requirements: - submfs = {'/': mdata} - for dn, bn in _moddirs(mfchangedfiles[x]): + for f in mfchangedfiles[x]: try: - submf = submfs[dn] - submf = submf._dirs[bn] + n = mdata[f] except KeyError: - continue # deleted directory, so nothing to send - submfs[submf.dir()] = submf - tmfclnodes = tmfnodes.setdefault(submf.dir(), {}) - tmfclnode = tmfclnodes.setdefault(submf._node, clnode) - if clrevorder[clnode] < clrevorder[tmfclnode]: - tmfclnodes[n] = clnode + continue + # record the first changeset introducing this filelog + # version + fclnodes = fnodes.setdefault(f, {}) + fclnode = fclnodes.setdefault(n, clnode) + if clrevorder[clnode] < clrevorder[fclnode]: + fclnodes[n] = clnode return clnode return lookupmflinknode @@ -829,7 +796,7 @@ while tmfnodes: dir = min(tmfnodes) nodes = tmfnodes[dir] - prunednodes = self.prune(ml.dirlog(dir), nodes, commonrevs) + prunednodes = self.prune(dirlog(dir), nodes, commonrevs) for x in self._packmanifests(dir, prunednodes, makelookupmflinknode(dir)): size += len(x)
--- a/mercurial/manifest.py Sun Dec 27 20:21:37 2015 +0900 +++ b/mercurial/manifest.py Fri Feb 12 23:09:09 2016 -0800 @@ -985,6 +985,15 @@ return self.readdelta(node) return self.read(node) + def readshallowfast(self, node): + '''like readfast(), but calls readshallowdelta() instead of readdelta() + ''' + r = self.rev(node) + deltaparent = self.deltaparent(r) + if deltaparent != revlog.nullrev and deltaparent in self.parentrevs(r): + return self.readshallowdelta(node) + return self.readshallow(node) + def read(self, node): if node == revlog.nullid: return self._newmanifest() # don't upset local cache @@ -1006,6 +1015,13 @@ self._mancache[node] = (m, arraytext) return m + def readshallow(self, node): + '''Reads the manifest in this directory. When using flat manifests, + this manifest will generally have files in subdirectories in it. Does + not cache the manifest as the callers generally do not read the same + version twice.''' + return manifestdict(self.revision(node)) + def find(self, node, f): '''look up entry for a single file efficiently. return (node, flags) pair if found, (None, None) if not.'''
--- a/tests/test-treemanifest.t Sun Dec 27 20:21:37 2015 +0900 +++ b/tests/test-treemanifest.t Fri Feb 12 23:09:09 2016 -0800 @@ -363,6 +363,13 @@ added 11 changesets with 15 changes to 10 files (+3 heads) $ grep treemanifest clone/.hg/requires treemanifest + $ hg -R clone verify + checking changesets + checking manifests + checking directory manifests + crosschecking files in changesets and manifests + checking files + 10 files, 11 changesets, 15 total revisions Create deeper repo with tree manifests.