Mercurial > hg
annotate mercurial/setdiscovery.py @ 32768:483d47753726
setdiscovery: improves logged message
The 'srvheads' list contains all server heads including the common ones. We
adjust 'ui.log' message to provide more useful information about server heads
locally unknown. The performance impact of turning the list to set is
negligible (about 1e-4s) compared to the rest of the discovery cost, so I'm
taking the easy path.
author | Pierre-Yves David <pierre-yves.david@octobus.net> |
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date | Sat, 10 Jun 2017 18:47:09 +0100 |
parents | 28240b75e880 |
children | f77121b6bf1b |
rev | line source |
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1 # setdiscovery.py - improved discovery of common nodeset for mercurial |
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2 # |
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3 # Copyright 2010 Benoit Boissinot <bboissin@gmail.com> |
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4 # and Peter Arrenbrecht <peter@arrenbrecht.ch> |
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5 # |
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6 # This software may be used and distributed according to the terms of the |
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7 # GNU General Public License version 2 or any later version. |
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8 """ |
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9 Algorithm works in the following way. You have two repository: local and |
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10 remote. They both contains a DAG of changelists. |
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11 |
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12 The goal of the discovery protocol is to find one set of node *common*, |
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13 the set of nodes shared by local and remote. |
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14 |
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15 One of the issue with the original protocol was latency, it could |
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16 potentially require lots of roundtrips to discover that the local repo was a |
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17 subset of remote (which is a very common case, you usually have few changes |
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18 compared to upstream, while upstream probably had lots of development). |
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19 |
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20 The new protocol only requires one interface for the remote repo: `known()`, |
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21 which given a set of changelists tells you if they are present in the DAG. |
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22 |
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23 The algorithm then works as follow: |
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24 |
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25 - We will be using three sets, `common`, `missing`, `unknown`. Originally |
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26 all nodes are in `unknown`. |
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27 - Take a sample from `unknown`, call `remote.known(sample)` |
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28 - For each node that remote knows, move it and all its ancestors to `common` |
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29 - For each node that remote doesn't know, move it and all its descendants |
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30 to `missing` |
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31 - Iterate until `unknown` is empty |
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32 |
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33 There are a couple optimizations, first is instead of starting with a random |
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34 sample of missing, start by sending all heads, in the case where the local |
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35 repo is a subset, you computed the answer in one round trip. |
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36 |
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37 Then you can do something similar to the bisecting strategy used when |
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38 finding faulty changesets. Instead of random samples, you can try picking |
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39 nodes that will maximize the number of nodes that will be |
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40 classified with it (since all ancestors or descendants will be marked as well). |
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41 """ |
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42 |
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43 from __future__ import absolute_import |
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44 |
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45 import collections |
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46 import random |
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47 |
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48 from .i18n import _ |
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49 from .node import ( |
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50 nullid, |
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51 nullrev, |
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52 ) |
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53 from . import ( |
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54 dagutil, |
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55 error, |
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56 util, |
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57 ) |
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58 |
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59 def _updatesample(dag, nodes, sample, quicksamplesize=0): |
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60 """update an existing sample to match the expected size |
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61 |
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62 The sample is updated with nodes exponentially distant from each head of the |
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63 <nodes> set. (H~1, H~2, H~4, H~8, etc). |
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64 |
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65 If a target size is specified, the sampling will stop once this size is |
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66 reached. Otherwise sampling will happen until roots of the <nodes> set are |
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67 reached. |
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68 |
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69 :dag: a dag object from dagutil |
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70 :nodes: set of nodes we want to discover (if None, assume the whole dag) |
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71 :sample: a sample to update |
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72 :quicksamplesize: optional target size of the sample""" |
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73 # if nodes is empty we scan the entire graph |
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74 if nodes: |
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75 heads = dag.headsetofconnecteds(nodes) |
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76 else: |
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77 heads = dag.heads() |
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78 dist = {} |
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79 visit = collections.deque(heads) |
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80 seen = set() |
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81 factor = 1 |
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82 while visit: |
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83 curr = visit.popleft() |
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84 if curr in seen: |
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85 continue |
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86 d = dist.setdefault(curr, 1) |
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87 if d > factor: |
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88 factor *= 2 |
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89 if d == factor: |
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90 sample.add(curr) |
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91 if quicksamplesize and (len(sample) >= quicksamplesize): |
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92 return |
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93 seen.add(curr) |
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94 for p in dag.parents(curr): |
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95 if not nodes or p in nodes: |
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96 dist.setdefault(p, d + 1) |
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97 visit.append(p) |
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98 |
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99 def _takequicksample(dag, nodes, size): |
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100 """takes a quick sample of size <size> |
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101 |
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102 It is meant for initial sampling and focuses on querying heads and close |
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103 ancestors of heads. |
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104 |
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105 :dag: a dag object |
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106 :nodes: set of nodes to discover |
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107 :size: the maximum size of the sample""" |
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108 sample = dag.headsetofconnecteds(nodes) |
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109 if size <= len(sample): |
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110 return _limitsample(sample, size) |
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111 _updatesample(dag, None, sample, quicksamplesize=size) |
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112 return sample |
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113 |
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114 def _takefullsample(dag, nodes, size): |
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115 sample = dag.headsetofconnecteds(nodes) |
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116 # update from heads |
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117 _updatesample(dag, nodes, sample) |
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118 # update from roots |
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119 _updatesample(dag.inverse(), nodes, sample) |
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120 assert sample |
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121 sample = _limitsample(sample, size) |
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122 if len(sample) < size: |
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123 more = size - len(sample) |
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124 sample.update(random.sample(list(nodes - sample), more)) |
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125 return sample |
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126 |
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127 def _limitsample(sample, desiredlen): |
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128 """return a random subset of sample of at most desiredlen item""" |
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129 if len(sample) > desiredlen: |
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130 sample = set(random.sample(sample, desiredlen)) |
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131 return sample |
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132 |
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133 def findcommonheads(ui, local, remote, |
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134 initialsamplesize=100, |
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135 fullsamplesize=200, |
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136 abortwhenunrelated=True): |
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137 '''Return a tuple (common, anyincoming, remoteheads) used to identify |
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138 missing nodes from or in remote. |
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139 ''' |
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140 start = util.timer() |
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141 |
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142 roundtrips = 0 |
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143 cl = local.changelog |
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144 dag = dagutil.revlogdag(cl) |
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145 |
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146 # early exit if we know all the specified remote heads already |
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147 ui.debug("query 1; heads\n") |
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148 roundtrips += 1 |
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149 ownheads = dag.heads() |
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150 sample = _limitsample(ownheads, initialsamplesize) |
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151 # indices between sample and externalized version must match |
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152 sample = list(sample) |
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153 batch = remote.iterbatch() |
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154 batch.heads() |
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155 batch.known(dag.externalizeall(sample)) |
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156 batch.submit() |
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157 srvheadhashes, yesno = batch.results() |
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158 |
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159 if cl.tip() == nullid: |
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160 if srvheadhashes != [nullid]: |
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161 return [nullid], True, srvheadhashes |
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162 return [nullid], False, [] |
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163 |
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164 # start actual discovery (we note this before the next "if" for |
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165 # compatibility reasons) |
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166 ui.status(_("searching for changes\n")) |
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167 |
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168 srvheads = dag.internalizeall(srvheadhashes, filterunknown=True) |
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169 if len(srvheads) == len(srvheadhashes): |
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170 ui.debug("all remote heads known locally\n") |
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171 return (srvheadhashes, False, srvheadhashes,) |
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172 |
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173 if sample and len(ownheads) <= initialsamplesize and all(yesno): |
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174 ui.note(_("all local heads known remotely\n")) |
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175 ownheadhashes = dag.externalizeall(ownheads) |
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176 return (ownheadhashes, True, srvheadhashes,) |
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177 |
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178 # full blown discovery |
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179 |
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181 # treat remote heads (and maybe own heads) as a first implicit sample |
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182 # response |
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183 common = cl.incrementalmissingrevs(srvheads) |
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184 commoninsample = set(n for i, n in enumerate(sample) if yesno[i]) |
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185 common.addbases(commoninsample) |
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186 # own nodes where I don't know if remote knows them |
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187 undecided = set(common.missingancestors(ownheads)) |
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189 missing = set() | |
190 | |
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191 full = False |
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192 while undecided: |
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193 |
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194 if sample: |
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195 missinginsample = [n for i, n in enumerate(sample) if not yesno[i]] |
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196 missing.update(dag.descendantset(missinginsample, missing)) |
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197 |
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198 undecided.difference_update(missing) |
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199 |
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200 if not undecided: |
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201 break |
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202 |
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203 if full or common.hasbases(): |
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204 if full: |
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205 ui.note(_("sampling from both directions\n")) |
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206 else: |
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207 ui.debug("taking initial sample\n") |
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208 samplefunc = _takefullsample |
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209 targetsize = fullsamplesize |
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210 else: |
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211 # use even cheaper initial sample |
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212 ui.debug("taking quick initial sample\n") |
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213 samplefunc = _takequicksample |
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214 targetsize = initialsamplesize |
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215 if len(undecided) < targetsize: |
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216 sample = list(undecided) |
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217 else: |
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218 sample = samplefunc(dag, undecided, targetsize) |
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219 sample = _limitsample(sample, targetsize) |
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220 |
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221 roundtrips += 1 |
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222 ui.progress(_('searching'), roundtrips, unit=_('queries')) |
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223 ui.debug("query %i; still undecided: %i, sample size is: %i\n" |
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224 % (roundtrips, len(undecided), len(sample))) |
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225 # indices between sample and externalized version must match |
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226 sample = list(sample) |
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227 yesno = remote.known(dag.externalizeall(sample)) |
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228 full = True |
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229 |
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230 if sample: |
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231 commoninsample = set(n for i, n in enumerate(sample) if yesno[i]) |
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232 common.addbases(commoninsample) |
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233 common.removeancestorsfrom(undecided) |
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234 |
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235 # heads(common) == heads(common.bases) since common represents common.bases |
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236 # and all its ancestors |
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237 result = dag.headsetofconnecteds(common.bases) |
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238 # common.bases can include nullrev, but our contract requires us to not |
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239 # return any heads in that case, so discard that |
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240 result.discard(nullrev) |
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discovery: include timing in the debug output
Pierre-Yves David <pierre-yves.david@octobus.net>
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241 elapsed = util.timer() - start |
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discovery: add new set-based discovery
Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
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242 ui.progress(_('searching'), None) |
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discovery: include timing in the debug output
Pierre-Yves David <pierre-yves.david@octobus.net>
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243 ui.debug("%d total queries in %.4fs\n" % (roundtrips, elapsed)) |
32768
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setdiscovery: improves logged message
Pierre-Yves David <pierre-yves.david@octobus.net>
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244 msg = ('found %d common and %d unknown server heads,' |
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245 ' %d roundtrips in %.4fs\n') |
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Pierre-Yves David <pierre-yves.david@octobus.net>
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246 missing = set(result) - set(srvheads) |
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Pierre-Yves David <pierre-yves.david@octobus.net>
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247 ui.log('discovery', msg, len(result), len(missing), roundtrips, |
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discovery: log discovery result in non-trivial cases
Pierre-Yves David <pierre-yves.david@octobus.net>
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248 elapsed) |
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Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
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249 |
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Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
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250 if not result and srvheadhashes != [nullid]: |
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Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
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251 if abortwhenunrelated: |
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error: get Abort from 'error' instead of 'util'
Pierre-Yves David <pierre-yves.david@fb.com>
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252 raise error.Abort(_("repository is unrelated")) |
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Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
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253 else: |
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Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
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254 ui.warn(_("warning: repository is unrelated\n")) |
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cleanup: use set literals
Martin von Zweigbergk <martinvonz@google.com>
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255 return ({nullid}, True, srvheadhashes,) |
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Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
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256 |
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setdiscovery: return anyincoming=False when remote's only head is nullid
Andrew Pritchard <andrewp@fogcreek.com>
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14833
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257 anyincoming = (srvheadhashes != [nullid]) |
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Andrew Pritchard <andrewp@fogcreek.com>
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258 return dag.externalizeall(result), anyincoming, srvheadhashes |