Mercurial > hg
annotate mercurial/simplemerge.py @ 26623:5a95fe44121d
clonebundles: support for seeding clones from pre-generated bundles
Cloning can be an expensive operation for servers because the server
generates a bundle from existing repository data at request time. For
a large repository like mozilla-central, this consumes 4+ minutes
of CPU time on the server. It also results in significant network
utilization. Multiplied by hundreds or even thousands of clients and
the ensuing load can result in difficulties scaling the Mercurial server.
Despite generation of bundles being deterministic until the next
changeset is added, the generation of bundles to service a clone request
is not cached. Each clone thus performs redundant work. This is
wasteful.
This patch introduces the "clonebundles" extension and related
client-side functionality to help alleviate this deficiency. The
client-side feature is behind an experimental flag and is not enabled by
default.
It works as follows:
1) Server operator generates a bundle and makes it available on a
server (likely HTTP).
2) Server operator defines the URL of a bundle file in a
.hg/clonebundles.manifest file.
3) Client `hg clone`ing sees the server is advertising bundle URLs.
4) Client fetches and applies the advertised bundle.
5) Client performs equivalent of `hg pull` to fetch changes made since
the bundle was created.
Essentially, the server performs the expensive work of generating a
bundle once and all subsequent clones fetch a static file from
somewhere. Scaling static file serving is a much more manageable
problem than scaling a Python application like Mercurial. Assuming your
repository grows less than 1% per day, the end result is 99+% of CPU
and network load from clones is eliminated, allowing Mercurial servers
to scale more easily. Serving static files also means data can be
transferred to clients as fast as they can consume it, rather than as
fast as servers can generate it. This makes clones faster.
Mozilla has implemented similar functionality of this patch on
hg.mozilla.org using a custom extension. We are hosting bundle files in
Amazon S3 and CloudFront (a CDN) and have successfully offloaded
>1 TB/day in data transfer from hg.mozilla.org, freeing up significant
bandwidth and CPU resources. The positive impact has been stellar and
I believe it has proved its value to be included in Mercurial core. I
feel it is important for the client-side support to be enabled in core
by default because it means that clients will get faster, more reliable
clones and will enable server operators to reduce load without
requiring any client-side configuration changes (assuming clients are
up to date, of course).
The scope of this feature is narrowly and specifically tailored to
cloning, despite "serve pulls from pre-generated bundles" being a valid
and useful feature. I would eventually like for Mercurial servers to
support transferring *all* repository data via statically hosted files.
You could imagine a server that siphons all pushed data to bundle files
and instructs clients to apply a stream of bundles to reconstruct all
repository data. This feature, while useful and powerful, is
significantly more work to implement because it requires the server
component have awareness of discovery and a mapping of which changesets
are in which files. Full, clone bundles, by contrast, are much simpler.
The wire protocol command is named "clonebundles" instead of something
more generic like "staticbundles" to leave the door open for a new, more
powerful and more generic server-side component with minimal backwards
compatibility implications. The name "bundleclone" is used by Mozilla's
extension and would cause problems since there are subtle differences
in Mozilla's extension.
Mozilla's experience with this idea has taught us that some form of
"content negotiation" is required. Not all clients will support all
bundle formats or even URLs (advanced TLS requirements, etc). To ensure
the highest uptake possible, a server needs to advertise multiple
versions of bundles and clients need to be able to choose the most
appropriate from that list one. The "attributes" in each
server-advertised entry facilitate this filtering and sorting. Their
use will become apparent in subsequent patches.
Initial inspiration and credit for the idea of cloning from static files
belongs to Augie Fackler and his "lookaside clone" extension proof of
concept.
author | Gregory Szorc <gregory.szorc@gmail.com> |
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date | Fri, 09 Oct 2015 11:22:01 -0700 |
parents | ef1eb6df7071 |
children | a504794cee29 |
rev | line source |
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1 # Copyright (C) 2004, 2005 Canonical Ltd |
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2 # |
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3 # This program is free software; you can redistribute it and/or modify |
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4 # it under the terms of the GNU General Public License as published by |
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5 # the Free Software Foundation; either version 2 of the License, or |
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6 # (at your option) any later version. |
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7 # |
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8 # This program is distributed in the hope that it will be useful, |
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9 # but WITHOUT ANY WARRANTY; without even the implied warranty of |
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10 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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11 # GNU General Public License for more details. |
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12 # |
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13 # You should have received a copy of the GNU General Public License |
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14 # along with this program; if not, see <http://www.gnu.org/licenses/>. |
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15 |
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16 # mbp: "you know that thing where cvs gives you conflict markers?" |
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17 # s: "i hate that." |
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18 |
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19 from __future__ import absolute_import |
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20 |
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21 import os |
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22 import sys |
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23 |
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24 from .i18n import _ |
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25 from . import ( |
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26 error, |
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27 mdiff, |
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28 scmutil, |
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29 util, |
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30 ) |
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31 |
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32 class CantReprocessAndShowBase(Exception): |
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33 pass |
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34 |
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35 def intersect(ra, rb): |
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36 """Given two ranges return the range where they intersect or None. |
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37 |
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38 >>> intersect((0, 10), (0, 6)) |
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39 (0, 6) |
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40 >>> intersect((0, 10), (5, 15)) |
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41 (5, 10) |
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42 >>> intersect((0, 10), (10, 15)) |
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43 >>> intersect((0, 9), (10, 15)) |
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44 >>> intersect((0, 9), (7, 15)) |
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45 (7, 9) |
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46 """ |
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47 assert ra[0] <= ra[1] |
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48 assert rb[0] <= rb[1] |
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49 |
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50 sa = max(ra[0], rb[0]) |
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51 sb = min(ra[1], rb[1]) |
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52 if sa < sb: |
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53 return sa, sb |
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54 else: |
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55 return None |
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56 |
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57 def compare_range(a, astart, aend, b, bstart, bend): |
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58 """Compare a[astart:aend] == b[bstart:bend], without slicing. |
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59 """ |
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60 if (aend - astart) != (bend - bstart): |
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61 return False |
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62 for ia, ib in zip(xrange(astart, aend), xrange(bstart, bend)): |
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63 if a[ia] != b[ib]: |
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64 return False |
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65 else: |
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66 return True |
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67 |
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68 class Merge3Text(object): |
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69 """3-way merge of texts. |
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70 |
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71 Given strings BASE, OTHER, THIS, tries to produce a combined text |
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72 incorporating the changes from both BASE->OTHER and BASE->THIS.""" |
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73 def __init__(self, basetext, atext, btext, base=None, a=None, b=None): |
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74 self.basetext = basetext |
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75 self.atext = atext |
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76 self.btext = btext |
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77 if base is None: |
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78 base = mdiff.splitnewlines(basetext) |
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79 if a is None: |
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80 a = mdiff.splitnewlines(atext) |
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81 if b is None: |
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82 b = mdiff.splitnewlines(btext) |
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83 self.base = base |
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84 self.a = a |
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85 self.b = b |
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86 |
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87 def merge_lines(self, |
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88 name_a=None, |
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89 name_b=None, |
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90 name_base=None, |
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91 start_marker='<<<<<<<', |
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92 mid_marker='=======', |
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93 end_marker='>>>>>>>', |
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94 base_marker=None, |
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95 localorother=None): |
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96 """Return merge in cvs-like form. |
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97 """ |
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98 self.conflicts = False |
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99 newline = '\n' |
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100 if len(self.a) > 0: |
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101 if self.a[0].endswith('\r\n'): |
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102 newline = '\r\n' |
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103 elif self.a[0].endswith('\r'): |
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104 newline = '\r' |
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105 if name_a and start_marker: |
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106 start_marker = start_marker + ' ' + name_a |
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107 if name_b and end_marker: |
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108 end_marker = end_marker + ' ' + name_b |
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109 if name_base and base_marker: |
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110 base_marker = base_marker + ' ' + name_base |
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111 merge_regions = self.merge_regions() |
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112 for t in merge_regions: |
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113 what = t[0] |
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114 if what == 'unchanged': |
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115 for i in range(t[1], t[2]): |
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116 yield self.base[i] |
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117 elif what == 'a' or what == 'same': |
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118 for i in range(t[1], t[2]): |
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119 yield self.a[i] |
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120 elif what == 'b': |
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121 for i in range(t[1], t[2]): |
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122 yield self.b[i] |
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123 elif what == 'conflict': |
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124 if localorother == 'local': |
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125 for i in range(t[3], t[4]): |
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126 yield self.a[i] |
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127 elif localorother == 'other': |
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128 for i in range(t[5], t[6]): |
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129 yield self.b[i] |
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130 else: |
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131 self.conflicts = True |
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132 if start_marker is not None: |
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133 yield start_marker + newline |
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134 for i in range(t[3], t[4]): |
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135 yield self.a[i] |
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136 if base_marker is not None: |
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137 yield base_marker + newline |
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138 for i in range(t[1], t[2]): |
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139 yield self.base[i] |
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140 if mid_marker is not None: |
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141 yield mid_marker + newline |
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142 for i in range(t[5], t[6]): |
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143 yield self.b[i] |
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144 if end_marker is not None: |
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145 yield end_marker + newline |
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146 else: |
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147 raise ValueError(what) |
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148 |
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149 def merge_groups(self): |
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150 """Yield sequence of line groups. Each one is a tuple: |
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151 |
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152 'unchanged', lines |
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153 Lines unchanged from base |
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154 |
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155 'a', lines |
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156 Lines taken from a |
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157 |
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158 'same', lines |
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159 Lines taken from a (and equal to b) |
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160 |
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161 'b', lines |
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162 Lines taken from b |
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163 |
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164 'conflict', base_lines, a_lines, b_lines |
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165 Lines from base were changed to either a or b and conflict. |
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166 """ |
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167 for t in self.merge_regions(): |
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168 what = t[0] |
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169 if what == 'unchanged': |
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170 yield what, self.base[t[1]:t[2]] |
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171 elif what == 'a' or what == 'same': |
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172 yield what, self.a[t[1]:t[2]] |
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173 elif what == 'b': |
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174 yield what, self.b[t[1]:t[2]] |
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175 elif what == 'conflict': |
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176 yield (what, |
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177 self.base[t[1]:t[2]], |
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178 self.a[t[3]:t[4]], |
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179 self.b[t[5]:t[6]]) |
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180 else: |
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181 raise ValueError(what) |
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182 |
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183 def merge_regions(self): |
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184 """Return sequences of matching and conflicting regions. |
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185 |
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186 This returns tuples, where the first value says what kind we |
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187 have: |
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188 |
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189 'unchanged', start, end |
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190 Take a region of base[start:end] |
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191 |
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192 'same', astart, aend |
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193 b and a are different from base but give the same result |
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194 |
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195 'a', start, end |
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196 Non-clashing insertion from a[start:end] |
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197 |
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198 Method is as follows: |
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199 |
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200 The two sequences align only on regions which match the base |
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201 and both descendants. These are found by doing a two-way diff |
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202 of each one against the base, and then finding the |
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203 intersections between those regions. These "sync regions" |
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204 are by definition unchanged in both and easily dealt with. |
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205 |
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206 The regions in between can be in any of three cases: |
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207 conflicted, or changed on only one side. |
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208 """ |
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209 |
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210 # section a[0:ia] has been disposed of, etc |
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211 iz = ia = ib = 0 |
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212 |
16683 | 213 for region in self.find_sync_regions(): |
214 zmatch, zend, amatch, aend, bmatch, bend = region | |
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215 #print 'match base [%d:%d]' % (zmatch, zend) |
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216 |
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217 matchlen = zend - zmatch |
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218 assert matchlen >= 0 |
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219 assert matchlen == (aend - amatch) |
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220 assert matchlen == (bend - bmatch) |
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221 |
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222 len_a = amatch - ia |
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223 len_b = bmatch - ib |
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224 len_base = zmatch - iz |
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225 assert len_a >= 0 |
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226 assert len_b >= 0 |
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227 assert len_base >= 0 |
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228 |
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229 #print 'unmatched a=%d, b=%d' % (len_a, len_b) |
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230 |
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231 if len_a or len_b: |
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232 # try to avoid actually slicing the lists |
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233 equal_a = compare_range(self.a, ia, amatch, |
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234 self.base, iz, zmatch) |
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235 equal_b = compare_range(self.b, ib, bmatch, |
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236 self.base, iz, zmatch) |
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237 same = compare_range(self.a, ia, amatch, |
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238 self.b, ib, bmatch) |
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239 |
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240 if same: |
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241 yield 'same', ia, amatch |
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242 elif equal_a and not equal_b: |
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243 yield 'b', ib, bmatch |
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244 elif equal_b and not equal_a: |
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245 yield 'a', ia, amatch |
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246 elif not equal_a and not equal_b: |
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247 yield 'conflict', iz, zmatch, ia, amatch, ib, bmatch |
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248 else: |
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249 raise AssertionError("can't handle a=b=base but unmatched") |
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250 |
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251 ia = amatch |
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252 ib = bmatch |
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253 iz = zmatch |
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254 |
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255 # if the same part of the base was deleted on both sides |
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256 # that's OK, we can just skip it. |
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257 |
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258 |
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259 if matchlen > 0: |
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260 assert ia == amatch |
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261 assert ib == bmatch |
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262 assert iz == zmatch |
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263 |
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264 yield 'unchanged', zmatch, zend |
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265 iz = zend |
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266 ia = aend |
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267 ib = bend |
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268 |
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269 def find_sync_regions(self): |
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270 """Return a list of sync regions, where both descendants match the base. |
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271 |
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272 Generates a list of (base1, base2, a1, a2, b1, b2). There is |
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273 always a zero-length sync region at the end of all the files. |
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274 """ |
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275 |
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276 ia = ib = 0 |
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277 amatches = mdiff.get_matching_blocks(self.basetext, self.atext) |
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278 bmatches = mdiff.get_matching_blocks(self.basetext, self.btext) |
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279 len_a = len(amatches) |
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280 len_b = len(bmatches) |
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281 |
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282 sl = [] |
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283 |
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284 while ia < len_a and ib < len_b: |
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285 abase, amatch, alen = amatches[ia] |
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286 bbase, bmatch, blen = bmatches[ib] |
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287 |
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288 # there is an unconflicted block at i; how long does it |
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289 # extend? until whichever one ends earlier. |
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290 i = intersect((abase, abase + alen), (bbase, bbase + blen)) |
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291 if i: |
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292 intbase = i[0] |
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293 intend = i[1] |
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294 intlen = intend - intbase |
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295 |
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296 # found a match of base[i[0], i[1]]; this may be less than |
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297 # the region that matches in either one |
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298 assert intlen <= alen |
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299 assert intlen <= blen |
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300 assert abase <= intbase |
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301 assert bbase <= intbase |
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302 |
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303 asub = amatch + (intbase - abase) |
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304 bsub = bmatch + (intbase - bbase) |
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305 aend = asub + intlen |
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306 bend = bsub + intlen |
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307 |
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308 assert self.base[intbase:intend] == self.a[asub:aend], \ |
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309 (self.base[intbase:intend], self.a[asub:aend]) |
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310 |
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311 assert self.base[intbase:intend] == self.b[bsub:bend] |
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312 |
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313 sl.append((intbase, intend, |
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314 asub, aend, |
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315 bsub, bend)) |
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316 |
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317 # advance whichever one ends first in the base text |
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318 if (abase + alen) < (bbase + blen): |
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319 ia += 1 |
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320 else: |
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321 ib += 1 |
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322 |
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323 intbase = len(self.base) |
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324 abase = len(self.a) |
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325 bbase = len(self.b) |
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326 sl.append((intbase, intbase, abase, abase, bbase, bbase)) |
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327 |
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328 return sl |
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329 |
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330 def find_unconflicted(self): |
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331 """Return a list of ranges in base that are not conflicted.""" |
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332 am = mdiff.get_matching_blocks(self.basetext, self.atext) |
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333 bm = mdiff.get_matching_blocks(self.basetext, self.btext) |
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334 |
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335 unc = [] |
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336 |
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337 while am and bm: |
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338 # there is an unconflicted block at i; how long does it |
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339 # extend? until whichever one ends earlier. |
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340 a1 = am[0][0] |
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341 a2 = a1 + am[0][2] |
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342 b1 = bm[0][0] |
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343 b2 = b1 + bm[0][2] |
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344 i = intersect((a1, a2), (b1, b2)) |
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345 if i: |
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346 unc.append(i) |
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347 |
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348 if a2 < b2: |
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349 del am[0] |
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350 else: |
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351 del bm[0] |
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352 |
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353 return unc |
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354 |
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355 def simplemerge(ui, local, base, other, **opts): |
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356 def readfile(filename): |
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357 f = open(filename, "rb") |
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358 text = f.read() |
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359 f.close() |
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360 if util.binary(text): |
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361 msg = _("%s looks like a binary file.") % filename |
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362 if not opts.get('quiet'): |
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363 ui.warn(_('warning: %s\n') % msg) |
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364 if not opts.get('text'): |
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365 raise error.Abort(msg) |
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366 return text |
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367 |
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368 mode = opts.get('mode','merge') |
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369 if mode == 'union': |
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370 name_a = None |
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371 name_b = None |
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372 name_base = None |
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373 else: |
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374 name_a = local |
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375 name_b = other |
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376 name_base = None |
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377 labels = opts.get('label', []) |
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378 if len(labels) > 0: |
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379 name_a = labels[0] |
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380 if len(labels) > 1: |
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381 name_b = labels[1] |
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382 if len(labels) > 2: |
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383 name_base = labels[2] |
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384 if len(labels) > 3: |
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385 raise error.Abort(_("can only specify three labels.")) |
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386 |
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387 try: |
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388 localtext = readfile(local) |
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389 basetext = readfile(base) |
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390 othertext = readfile(other) |
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391 except error.Abort: |
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392 return 1 |
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393 |
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394 local = os.path.realpath(local) |
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395 if not opts.get('print'): |
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396 opener = scmutil.opener(os.path.dirname(local)) |
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397 out = opener(os.path.basename(local), "w", atomictemp=True) |
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398 else: |
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399 out = sys.stdout |
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400 |
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401 m3 = Merge3Text(basetext, localtext, othertext) |
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402 extrakwargs = {"localorother": opts.get("localorother", None)} |
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403 if mode == 'union': |
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404 extrakwargs['start_marker'] = None |
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405 extrakwargs['mid_marker'] = None |
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406 extrakwargs['end_marker'] = None |
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407 elif name_base is not None: |
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408 extrakwargs['base_marker'] = '|||||||' |
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409 extrakwargs['name_base'] = name_base |
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410 for line in m3.merge_lines(name_a=name_a, name_b=name_b, **extrakwargs): |
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411 out.write(line) |
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412 |
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413 if not opts.get('print'): |
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414 out.close() |
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415 |
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416 if m3.conflicts and not mode == 'union': |
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417 return 1 |