nodemap: only use persistent nodemap for non-inlined revlog
Revlog are inlined while they are small (to avoid having too many file to deal
with). The persistent nodemap will only provides a significant boost for large
enough revlog index. So it does not make sens to add an extra file to store
nodemap for small revlog.
We could consider inclining the nodemap data inside the revlog itself, but the
benefit is unclear so let it be an adventure for another time.
Differential Revision: https://phab.mercurial-scm.org/D7837
# exchangev2.py - repository exchange for wire protocol version 2
#
# Copyright 2018 Gregory Szorc <gregory.szorc@gmail.com>
#
# This software may be used and distributed according to the terms of the
# GNU General Public License version 2 or any later version.
from __future__ import absolute_import
import collections
import weakref
from .i18n import _
from .node import (
nullid,
short,
)
from . import (
bookmarks,
error,
mdiff,
narrowspec,
phases,
pycompat,
setdiscovery,
)
from .interfaces import repository
def pull(pullop):
"""Pull using wire protocol version 2."""
repo = pullop.repo
remote = pullop.remote
usingrawchangelogandmanifest = _checkuserawstorefiledata(pullop)
# If this is a clone and it was requested to perform a "stream clone",
# we obtain the raw files data from the remote then fall back to an
# incremental pull. This is somewhat hacky and is not nearly robust enough
# for long-term usage.
if usingrawchangelogandmanifest:
with repo.transaction(b'clone'):
_fetchrawstorefiles(repo, remote)
repo.invalidate(clearfilecache=True)
tr = pullop.trmanager.transaction()
# We don't use the repo's narrow matcher here because the patterns passed
# to exchange.pull() could be different.
narrowmatcher = narrowspec.match(
repo.root,
# Empty maps to nevermatcher. So always
# set includes if missing.
pullop.includepats or {b'path:.'},
pullop.excludepats,
)
if pullop.includepats or pullop.excludepats:
pathfilter = {}
if pullop.includepats:
pathfilter[b'include'] = sorted(pullop.includepats)
if pullop.excludepats:
pathfilter[b'exclude'] = sorted(pullop.excludepats)
else:
pathfilter = None
# Figure out what needs to be fetched.
common, fetch, remoteheads = _pullchangesetdiscovery(
repo, remote, pullop.heads, abortwhenunrelated=pullop.force
)
# And fetch the data.
pullheads = pullop.heads or remoteheads
csetres = _fetchchangesets(repo, tr, remote, common, fetch, pullheads)
# New revisions are written to the changelog. But all other updates
# are deferred. Do those now.
# Ensure all new changesets are draft by default. If the repo is
# publishing, the phase will be adjusted by the loop below.
if csetres[b'added']:
phases.registernew(repo, tr, phases.draft, csetres[b'added'])
# And adjust the phase of all changesets accordingly.
for phase in phases.phasenames:
if phase == b'secret' or not csetres[b'nodesbyphase'][phase]:
continue
phases.advanceboundary(
repo,
tr,
phases.phasenames.index(phase),
csetres[b'nodesbyphase'][phase],
)
# Write bookmark updates.
bookmarks.updatefromremote(
repo.ui,
repo,
csetres[b'bookmarks'],
remote.url(),
pullop.gettransaction,
explicit=pullop.explicitbookmarks,
)
manres = _fetchmanifests(repo, tr, remote, csetres[b'manifestnodes'])
# We don't properly support shallow changeset and manifest yet. So we apply
# depth limiting locally.
if pullop.depth:
relevantcsetnodes = set()
clnode = repo.changelog.node
for rev in repo.revs(
b'ancestors(%ln, %s)', pullheads, pullop.depth - 1
):
relevantcsetnodes.add(clnode(rev))
csetrelevantfilter = lambda n: n in relevantcsetnodes
else:
csetrelevantfilter = lambda n: True
# If obtaining the raw store files, we need to scan the full repo to
# derive all the changesets, manifests, and linkrevs.
if usingrawchangelogandmanifest:
csetsforfiles = []
mnodesforfiles = []
manifestlinkrevs = {}
for rev in repo:
ctx = repo[rev]
node = ctx.node()
if not csetrelevantfilter(node):
continue
mnode = ctx.manifestnode()
csetsforfiles.append(node)
mnodesforfiles.append(mnode)
manifestlinkrevs[mnode] = rev
else:
csetsforfiles = [n for n in csetres[b'added'] if csetrelevantfilter(n)]
mnodesforfiles = manres[b'added']
manifestlinkrevs = manres[b'linkrevs']
# Find all file nodes referenced by added manifests and fetch those
# revisions.
fnodes = _derivefilesfrommanifests(repo, narrowmatcher, mnodesforfiles)
_fetchfilesfromcsets(
repo,
tr,
remote,
pathfilter,
fnodes,
csetsforfiles,
manifestlinkrevs,
shallow=bool(pullop.depth),
)
def _checkuserawstorefiledata(pullop):
"""Check whether we should use rawstorefiledata command to retrieve data."""
repo = pullop.repo
remote = pullop.remote
# Command to obtain raw store data isn't available.
if b'rawstorefiledata' not in remote.apidescriptor[b'commands']:
return False
# Only honor if user requested stream clone operation.
if not pullop.streamclonerequested:
return False
# Only works on empty repos.
if len(repo):
return False
# TODO This is super hacky. There needs to be a storage API for this. We
# also need to check for compatibility with the remote.
if b'revlogv1' not in repo.requirements:
return False
return True
def _fetchrawstorefiles(repo, remote):
with remote.commandexecutor() as e:
objs = e.callcommand(
b'rawstorefiledata', {b'files': [b'changelog', b'manifestlog'],}
).result()
# First object is a summary of files data that follows.
overall = next(objs)
progress = repo.ui.makeprogress(
_(b'clone'), total=overall[b'totalsize'], unit=_(b'bytes')
)
with progress:
progress.update(0)
# Next are pairs of file metadata, data.
while True:
try:
filemeta = next(objs)
except StopIteration:
break
for k in (b'location', b'path', b'size'):
if k not in filemeta:
raise error.Abort(
_(b'remote file data missing key: %s') % k
)
if filemeta[b'location'] == b'store':
vfs = repo.svfs
else:
raise error.Abort(
_(b'invalid location for raw file data: %s')
% filemeta[b'location']
)
bytesremaining = filemeta[b'size']
with vfs.open(filemeta[b'path'], b'wb') as fh:
while True:
try:
chunk = next(objs)
except StopIteration:
break
bytesremaining -= len(chunk)
if bytesremaining < 0:
raise error.Abort(
_(
b'received invalid number of bytes for file '
b'data; expected %d, got extra'
)
% filemeta[b'size']
)
progress.increment(step=len(chunk))
fh.write(chunk)
try:
if chunk.islast:
break
except AttributeError:
raise error.Abort(
_(
b'did not receive indefinite length bytestring '
b'for file data'
)
)
if bytesremaining:
raise error.Abort(
_(
b'received invalid number of bytes for'
b'file data; expected %d got %d'
)
% (
filemeta[b'size'],
filemeta[b'size'] - bytesremaining,
)
)
def _pullchangesetdiscovery(repo, remote, heads, abortwhenunrelated=True):
"""Determine which changesets need to be pulled."""
if heads:
knownnode = repo.changelog.hasnode
if all(knownnode(head) for head in heads):
return heads, False, heads
# TODO wire protocol version 2 is capable of more efficient discovery
# than setdiscovery. Consider implementing something better.
common, fetch, remoteheads = setdiscovery.findcommonheads(
repo.ui, repo, remote, abortwhenunrelated=abortwhenunrelated
)
common = set(common)
remoteheads = set(remoteheads)
# If a remote head is filtered locally, put it back in the common set.
# See the comment in exchange._pulldiscoverychangegroup() for more.
if fetch and remoteheads:
has_node = repo.unfiltered().changelog.index.has_node
common |= {head for head in remoteheads if has_node(head)}
if set(remoteheads).issubset(common):
fetch = []
common.discard(nullid)
return common, fetch, remoteheads
def _fetchchangesets(repo, tr, remote, common, fetch, remoteheads):
# TODO consider adding a step here where we obtain the DAG shape first
# (or ask the server to slice changesets into chunks for us) so that
# we can perform multiple fetches in batches. This will facilitate
# resuming interrupted clones, higher server-side cache hit rates due
# to smaller segments, etc.
with remote.commandexecutor() as e:
objs = e.callcommand(
b'changesetdata',
{
b'revisions': [
{
b'type': b'changesetdagrange',
b'roots': sorted(common),
b'heads': sorted(remoteheads),
}
],
b'fields': {b'bookmarks', b'parents', b'phase', b'revision'},
},
).result()
# The context manager waits on all response data when exiting. So
# we need to remain in the context manager in order to stream data.
return _processchangesetdata(repo, tr, objs)
def _processchangesetdata(repo, tr, objs):
repo.hook(b'prechangegroup', throw=True, **pycompat.strkwargs(tr.hookargs))
urepo = repo.unfiltered()
cl = urepo.changelog
cl.delayupdate(tr)
# The first emitted object is a header describing the data that
# follows.
meta = next(objs)
progress = repo.ui.makeprogress(
_(b'changesets'), unit=_(b'chunks'), total=meta.get(b'totalitems')
)
manifestnodes = {}
def linkrev(node):
repo.ui.debug(b'add changeset %s\n' % short(node))
# Linkrev for changelog is always self.
return len(cl)
def onchangeset(cl, node):
progress.increment()
revision = cl.changelogrevision(node)
# We need to preserve the mapping of changelog revision to node
# so we can set the linkrev accordingly when manifests are added.
manifestnodes[cl.rev(node)] = revision.manifest
nodesbyphase = {phase: set() for phase in phases.phasenames}
remotebookmarks = {}
# addgroup() expects a 7-tuple describing revisions. This normalizes
# the wire data to that format.
#
# This loop also aggregates non-revision metadata, such as phase
# data.
def iterrevisions():
for cset in objs:
node = cset[b'node']
if b'phase' in cset:
nodesbyphase[cset[b'phase']].add(node)
for mark in cset.get(b'bookmarks', []):
remotebookmarks[mark] = node
# TODO add mechanism for extensions to examine records so they
# can siphon off custom data fields.
extrafields = {}
for field, size in cset.get(b'fieldsfollowing', []):
extrafields[field] = next(objs)
# Some entries might only be metadata only updates.
if b'revision' not in extrafields:
continue
data = extrafields[b'revision']
yield (
node,
cset[b'parents'][0],
cset[b'parents'][1],
# Linknode is always itself for changesets.
cset[b'node'],
# We always send full revisions. So delta base is not set.
nullid,
mdiff.trivialdiffheader(len(data)) + data,
# Flags not yet supported.
0,
)
added = cl.addgroup(
iterrevisions(), linkrev, weakref.proxy(tr), addrevisioncb=onchangeset
)
progress.complete()
return {
b'added': added,
b'nodesbyphase': nodesbyphase,
b'bookmarks': remotebookmarks,
b'manifestnodes': manifestnodes,
}
def _fetchmanifests(repo, tr, remote, manifestnodes):
rootmanifest = repo.manifestlog.getstorage(b'')
# Some manifests can be shared between changesets. Filter out revisions
# we already know about.
fetchnodes = []
linkrevs = {}
seen = set()
for clrev, node in sorted(pycompat.iteritems(manifestnodes)):
if node in seen:
continue
try:
rootmanifest.rev(node)
except error.LookupError:
fetchnodes.append(node)
linkrevs[node] = clrev
seen.add(node)
# TODO handle tree manifests
# addgroup() expects 7-tuple describing revisions. This normalizes
# the wire data to that format.
def iterrevisions(objs, progress):
for manifest in objs:
node = manifest[b'node']
extrafields = {}
for field, size in manifest.get(b'fieldsfollowing', []):
extrafields[field] = next(objs)
if b'delta' in extrafields:
basenode = manifest[b'deltabasenode']
delta = extrafields[b'delta']
elif b'revision' in extrafields:
basenode = nullid
revision = extrafields[b'revision']
delta = mdiff.trivialdiffheader(len(revision)) + revision
else:
continue
yield (
node,
manifest[b'parents'][0],
manifest[b'parents'][1],
# The value passed in is passed to the lookup function passed
# to addgroup(). We already have a map of manifest node to
# changelog revision number. So we just pass in the
# manifest node here and use linkrevs.__getitem__ as the
# resolution function.
node,
basenode,
delta,
# Flags not yet supported.
0,
)
progress.increment()
progress = repo.ui.makeprogress(
_(b'manifests'), unit=_(b'chunks'), total=len(fetchnodes)
)
commandmeta = remote.apidescriptor[b'commands'][b'manifestdata']
batchsize = commandmeta.get(b'recommendedbatchsize', 10000)
# TODO make size configurable on client?
# We send commands 1 at a time to the remote. This is not the most
# efficient because we incur a round trip at the end of each batch.
# However, the existing frame-based reactor keeps consuming server
# data in the background. And this results in response data buffering
# in memory. This can consume gigabytes of memory.
# TODO send multiple commands in a request once background buffering
# issues are resolved.
added = []
for i in pycompat.xrange(0, len(fetchnodes), batchsize):
batch = [node for node in fetchnodes[i : i + batchsize]]
if not batch:
continue
with remote.commandexecutor() as e:
objs = e.callcommand(
b'manifestdata',
{
b'tree': b'',
b'nodes': batch,
b'fields': {b'parents', b'revision'},
b'haveparents': True,
},
).result()
# Chomp off header object.
next(objs)
added.extend(
rootmanifest.addgroup(
iterrevisions(objs, progress),
linkrevs.__getitem__,
weakref.proxy(tr),
)
)
progress.complete()
return {
b'added': added,
b'linkrevs': linkrevs,
}
def _derivefilesfrommanifests(repo, matcher, manifestnodes):
"""Determine what file nodes are relevant given a set of manifest nodes.
Returns a dict mapping file paths to dicts of file node to first manifest
node.
"""
ml = repo.manifestlog
fnodes = collections.defaultdict(dict)
progress = repo.ui.makeprogress(
_(b'scanning manifests'), total=len(manifestnodes)
)
with progress:
for manifestnode in manifestnodes:
m = ml.get(b'', manifestnode)
# TODO this will pull in unwanted nodes because it takes the storage
# delta into consideration. What we really want is something that
# takes the delta between the manifest's parents. And ideally we
# would ignore file nodes that are known locally. For now, ignore
# both these limitations. This will result in incremental fetches
# requesting data we already have. So this is far from ideal.
md = m.readfast()
for path, fnode in md.items():
if matcher(path):
fnodes[path].setdefault(fnode, manifestnode)
progress.increment()
return fnodes
def _fetchfiles(repo, tr, remote, fnodes, linkrevs):
"""Fetch file data from explicit file revisions."""
def iterrevisions(objs, progress):
for filerevision in objs:
node = filerevision[b'node']
extrafields = {}
for field, size in filerevision.get(b'fieldsfollowing', []):
extrafields[field] = next(objs)
if b'delta' in extrafields:
basenode = filerevision[b'deltabasenode']
delta = extrafields[b'delta']
elif b'revision' in extrafields:
basenode = nullid
revision = extrafields[b'revision']
delta = mdiff.trivialdiffheader(len(revision)) + revision
else:
continue
yield (
node,
filerevision[b'parents'][0],
filerevision[b'parents'][1],
node,
basenode,
delta,
# Flags not yet supported.
0,
)
progress.increment()
progress = repo.ui.makeprogress(
_(b'files'),
unit=_(b'chunks'),
total=sum(len(v) for v in pycompat.itervalues(fnodes)),
)
# TODO make batch size configurable
batchsize = 10000
fnodeslist = [x for x in sorted(fnodes.items())]
for i in pycompat.xrange(0, len(fnodeslist), batchsize):
batch = [x for x in fnodeslist[i : i + batchsize]]
if not batch:
continue
with remote.commandexecutor() as e:
fs = []
locallinkrevs = {}
for path, nodes in batch:
fs.append(
(
path,
e.callcommand(
b'filedata',
{
b'path': path,
b'nodes': sorted(nodes),
b'fields': {b'parents', b'revision'},
b'haveparents': True,
},
),
)
)
locallinkrevs[path] = {
node: linkrevs[manifestnode]
for node, manifestnode in pycompat.iteritems(nodes)
}
for path, f in fs:
objs = f.result()
# Chomp off header objects.
next(objs)
store = repo.file(path)
store.addgroup(
iterrevisions(objs, progress),
locallinkrevs[path].__getitem__,
weakref.proxy(tr),
)
def _fetchfilesfromcsets(
repo, tr, remote, pathfilter, fnodes, csets, manlinkrevs, shallow=False
):
"""Fetch file data from explicit changeset revisions."""
def iterrevisions(objs, remaining, progress):
while remaining:
filerevision = next(objs)
node = filerevision[b'node']
extrafields = {}
for field, size in filerevision.get(b'fieldsfollowing', []):
extrafields[field] = next(objs)
if b'delta' in extrafields:
basenode = filerevision[b'deltabasenode']
delta = extrafields[b'delta']
elif b'revision' in extrafields:
basenode = nullid
revision = extrafields[b'revision']
delta = mdiff.trivialdiffheader(len(revision)) + revision
else:
continue
if b'linknode' in filerevision:
linknode = filerevision[b'linknode']
else:
linknode = node
yield (
node,
filerevision[b'parents'][0],
filerevision[b'parents'][1],
linknode,
basenode,
delta,
# Flags not yet supported.
0,
)
progress.increment()
remaining -= 1
progress = repo.ui.makeprogress(
_(b'files'),
unit=_(b'chunks'),
total=sum(len(v) for v in pycompat.itervalues(fnodes)),
)
commandmeta = remote.apidescriptor[b'commands'][b'filesdata']
batchsize = commandmeta.get(b'recommendedbatchsize', 50000)
shallowfiles = repository.REPO_FEATURE_SHALLOW_FILE_STORAGE in repo.features
fields = {b'parents', b'revision'}
clrev = repo.changelog.rev
# There are no guarantees that we'll have ancestor revisions if
# a) this repo has shallow file storage b) shallow data fetching is enabled.
# Force remote to not delta against possibly unknown revisions when these
# conditions hold.
haveparents = not (shallowfiles or shallow)
# Similarly, we may not have calculated linkrevs for all incoming file
# revisions. Ask the remote to do work for us in this case.
if not haveparents:
fields.add(b'linknode')
for i in pycompat.xrange(0, len(csets), batchsize):
batch = [x for x in csets[i : i + batchsize]]
if not batch:
continue
with remote.commandexecutor() as e:
args = {
b'revisions': [
{b'type': b'changesetexplicit', b'nodes': batch,}
],
b'fields': fields,
b'haveparents': haveparents,
}
if pathfilter:
args[b'pathfilter'] = pathfilter
objs = e.callcommand(b'filesdata', args).result()
# First object is an overall header.
overall = next(objs)
# We have overall['totalpaths'] segments.
for i in pycompat.xrange(overall[b'totalpaths']):
header = next(objs)
path = header[b'path']
store = repo.file(path)
linkrevs = {
fnode: manlinkrevs[mnode]
for fnode, mnode in pycompat.iteritems(fnodes[path])
}
def getlinkrev(node):
if node in linkrevs:
return linkrevs[node]
else:
return clrev(node)
store.addgroup(
iterrevisions(objs, header[b'totalitems'], progress),
getlinkrev,
weakref.proxy(tr),
maybemissingparents=shallow,
)