annotate mercurial/unionrepo.py @ 24735:07200e3332a1

tags: extract .hgtags filenodes cache to a standalone file Resolution of .hgtags filenodes values has historically been a performance pain point for large repositories, where reading individual manifests can take over 100ms. Multiplied by hundreds or even thousands of heads and resolving .hgtags filenodes becomes a performance issue. This patch establishes a standalone cache file holding the .hgtags filenodes for each changeset. After this patch, the .hgtags filenode for any particular changeset should only have to be computed once during the lifetime of the repository. The introduced hgtagsfnodes1 cache file is modeled after the rev branch cache: the cache is effectively an array of entries consisting of a changeset fragment and the filenode for a revision. The file grows in proportion to the length of the repository (24 bytes per changeset) and is truncated when the repository is stripped. The file is not written unless tag info is requested and tags have changed since last time. This patch partially addresses issue4550. Future patches will split the "tags" cache file into per-filter files and will refactor the cache format to not capture the .hgtags fnodes, as these are now stored in the hgtagsfnodes1 cache. This patch is capable of standing alone. We should not have to wait on the tags cache filter split and format refactor for this patch to land.
author Gregory Szorc <gregory.szorc@gmail.com>
date Wed, 15 Apr 2015 17:42:38 -0400
parents 76f6ae06ddf5
children e4f75c93f073
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1 # unionrepo.py - repository class for viewing union of repository changesets
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2 #
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3 # Derived from bundlerepo.py
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4 # Copyright 2006, 2007 Benoit Boissinot <bboissin@gmail.com>
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5 # Copyright 2013 Unity Technologies, Mads Kiilerich <madski@unity3d.com>
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6 #
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7 # This software may be used and distributed according to the terms of the
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8 # GNU General Public License version 2 or any later version.
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9
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10 """Repository class for "in-memory pull" of one local repository to another,
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11 allowing operations like diff and log with revsets.
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12 """
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13
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14 from node import nullid
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15 from i18n import _
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16 import os
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17 import util, mdiff, cmdutil, scmutil
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18 import localrepo, changelog, manifest, filelog, revlog
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19
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20 class unionrevlog(revlog.revlog):
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21 def __init__(self, opener, indexfile, revlog2, linkmapper):
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22 # How it works:
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23 # To retrieve a revision, we just need to know the node id so we can
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24 # look it up in revlog2.
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25 #
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26 # To differentiate a rev in the second revlog from a rev in the revlog,
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27 # we check revision against repotiprev.
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28 opener = scmutil.readonlyvfs(opener)
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29 revlog.revlog.__init__(self, opener, indexfile)
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30 self.revlog2 = revlog2
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31
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32 n = len(self)
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33 self.repotiprev = n - 1
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34 self.bundlerevs = set() # used by 'bundle()' revset expression
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35 for rev2 in self.revlog2:
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36 rev = self.revlog2.index[rev2]
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37 # rev numbers - in revlog2, very different from self.rev
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38 _start, _csize, _rsize, _base, linkrev, p1rev, p2rev, node = rev
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39
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40 if linkmapper is None: # link is to same revlog
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41 assert linkrev == rev2 # we never link back
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42 link = n
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43 else: # rev must be mapped from repo2 cl to unified cl by linkmapper
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44 link = linkmapper(linkrev)
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45
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46 if node in self.nodemap:
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47 # this happens for the common revlog revisions
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48 self.bundlerevs.add(self.nodemap[node])
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49 continue
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50
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51 p1node = self.revlog2.node(p1rev)
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52 p2node = self.revlog2.node(p2rev)
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53
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54 e = (None, None, None, None,
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55 link, self.rev(p1node), self.rev(p2node), node)
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56 self.index.insert(-1, e)
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57 self.nodemap[node] = n
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58 self.bundlerevs.add(n)
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59 n += 1
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60
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61 def _chunk(self, rev):
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62 if rev <= self.repotiprev:
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63 return revlog.revlog._chunk(self, rev)
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64 return self.revlog2._chunk(self.node(rev))
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65
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66 def revdiff(self, rev1, rev2):
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67 """return or calculate a delta between two revisions"""
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68 if rev1 > self.repotiprev and rev2 > self.repotiprev:
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69 return self.revlog2.revdiff(
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70 self.revlog2.rev(self.node(rev1)),
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71 self.revlog2.rev(self.node(rev2)))
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72 elif rev1 <= self.repotiprev and rev2 <= self.repotiprev:
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73 return self.baserevdiff(rev1, rev2)
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74
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75 return mdiff.textdiff(self.revision(self.node(rev1)),
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76 self.revision(self.node(rev2)))
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77
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78 def revision(self, nodeorrev):
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79 """return an uncompressed revision of a given node or revision
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80 number.
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81 """
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82 if isinstance(nodeorrev, int):
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83 rev = nodeorrev
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84 node = self.node(rev)
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85 else:
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86 node = nodeorrev
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87 rev = self.rev(node)
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88
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89 if node == nullid:
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90 return ""
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91
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92 if rev > self.repotiprev:
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93 text = self.revlog2.revision(node)
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94 self._cache = (node, rev, text)
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95 else:
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96 text = self.baserevision(rev)
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97 # already cached
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98 return text
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99
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100 def baserevision(self, nodeorrev):
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101 # Revlog subclasses may override 'revision' method to modify format of
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102 # content retrieved from revlog. To use unionrevlog with such class one
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103 # needs to override 'baserevision' and make more specific call here.
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104 return revlog.revlog.revision(self, nodeorrev)
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105
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106 def baserevdiff(self, rev1, rev2):
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107 # Exists for the same purpose as baserevision.
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108 return revlog.revlog.revdiff(self, rev1, rev2)
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109
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110 def addrevision(self, text, transaction, link, p1=None, p2=None, d=None):
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111 raise NotImplementedError
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112 def addgroup(self, revs, linkmapper, transaction):
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113 raise NotImplementedError
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114 def strip(self, rev, minlink):
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115 raise NotImplementedError
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116 def checksize(self):
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117 raise NotImplementedError
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118
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119 class unionchangelog(unionrevlog, changelog.changelog):
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120 def __init__(self, opener, opener2):
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121 changelog.changelog.__init__(self, opener)
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122 linkmapper = None
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123 changelog2 = changelog.changelog(opener2)
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124 unionrevlog.__init__(self, opener, self.indexfile, changelog2,
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125 linkmapper)
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126
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127 def baserevision(self, nodeorrev):
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128 # Although changelog doesn't override 'revision' method, some extensions
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129 # may replace this class with another that does. Same story with
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130 # manifest and filelog classes.
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131 return changelog.changelog.revision(self, nodeorrev)
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132
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133 def baserevdiff(self, rev1, rev2):
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134 return changelog.changelog.revdiff(self, rev1, rev2)
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135
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136 class unionmanifest(unionrevlog, manifest.manifest):
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137 def __init__(self, opener, opener2, linkmapper):
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138 manifest.manifest.__init__(self, opener)
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139 manifest2 = manifest.manifest(opener2)
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140 unionrevlog.__init__(self, opener, self.indexfile, manifest2,
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141 linkmapper)
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142
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143 def baserevision(self, nodeorrev):
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144 return manifest.manifest.revision(self, nodeorrev)
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145
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146 def baserevdiff(self, rev1, rev2):
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147 return manifest.manifest.revdiff(self, rev1, rev2)
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148
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149 class unionfilelog(unionrevlog, filelog.filelog):
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150 def __init__(self, opener, path, opener2, linkmapper, repo):
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151 filelog.filelog.__init__(self, opener, path)
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152 filelog2 = filelog.filelog(opener2, path)
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153 unionrevlog.__init__(self, opener, self.indexfile, filelog2,
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154 linkmapper)
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155 self._repo = repo
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156
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157 def baserevision(self, nodeorrev):
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158 return filelog.filelog.revision(self, nodeorrev)
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159
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160 def baserevdiff(self, rev1, rev2):
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161 return filelog.filelog.revdiff(self, rev1, rev2)
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162
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163 def iscensored(self, rev):
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164 """Check if a revision is censored."""
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165 if rev <= self.repotiprev:
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166 return filelog.filelog.iscensored(self, rev)
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167 return self.revlog2.iscensored(rev)
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168
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169 class unionpeer(localrepo.localpeer):
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170 def canpush(self):
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171 return False
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172
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173 class unionrepository(localrepo.localrepository):
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174 def __init__(self, ui, path, path2):
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175 localrepo.localrepository.__init__(self, ui, path)
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176 self.ui.setconfig('phases', 'publish', False, 'unionrepo')
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177
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178 self._url = 'union:%s+%s' % (util.expandpath(path),
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179 util.expandpath(path2))
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180 self.repo2 = localrepo.localrepository(ui, path2)
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181
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182 @localrepo.unfilteredpropertycache
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183 def changelog(self):
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184 return unionchangelog(self.svfs, self.repo2.svfs)
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185
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186 def _clrev(self, rev2):
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187 """map from repo2 changelog rev to temporary rev in self.changelog"""
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188 node = self.repo2.changelog.node(rev2)
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189 return self.changelog.rev(node)
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190
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191 @localrepo.unfilteredpropertycache
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192 def manifest(self):
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193 return unionmanifest(self.svfs, self.repo2.svfs,
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194 self._clrev)
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195
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196 def url(self):
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197 return self._url
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198
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199 def file(self, f):
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200 return unionfilelog(self.svfs, f, self.repo2.svfs,
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201 self._clrev, self)
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202
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203 def close(self):
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204 self.repo2.close()
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205
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206 def cancopy(self):
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207 return False
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208
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209 def peer(self):
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210 return unionpeer(self)
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211
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212 def getcwd(self):
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213 return os.getcwd() # always outside the repo
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214
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215 def instance(ui, path, create):
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216 if create:
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217 raise util.Abort(_('cannot create new union repository'))
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218 parentpath = ui.config("bundle", "mainreporoot", "")
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219 if not parentpath:
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220 # try to find the correct path to the working directory repo
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221 parentpath = cmdutil.findrepo(os.getcwd())
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222 if parentpath is None:
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223 parentpath = ''
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224 if parentpath:
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225 # Try to make the full path relative so we get a nice, short URL.
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226 # In particular, we don't want temp dir names in test outputs.
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227 cwd = os.getcwd()
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228 if parentpath == cwd:
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229 parentpath = ''
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230 else:
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231 cwd = os.path.join(cwd,'')
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232 if parentpath.startswith(cwd):
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233 parentpath = parentpath[len(cwd):]
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234 if path.startswith('union:'):
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235 s = path.split(":", 1)[1].split("+", 1)
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236 if len(s) == 1:
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237 repopath, repopath2 = parentpath, s[0]
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238 else:
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239 repopath, repopath2 = s
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240 else:
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241 repopath, repopath2 = parentpath, path
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242 return unionrepository(ui, repopath, repopath2)