Mercurial > hg
annotate tests/test-histedit-drop.t @ 40021:c537144fdbef
wireprotov2: support response caching
One of the things I've learned from managing VCS servers over the
years is that they are hard to scale. It is well known that some
companies have very beefy (read: very expensive) servers to power
their VCS needs. It is also known that specialized servers for
various VCS exist in order to facilitate scaling servers. (Mercurial
is in this boat.)
One of the aspects that make a VCS server hard to scale is the
high CPU load incurred by constant client clone/pull operations.
To alleviate the scaling pain associated with data retrieval
operations, I want to integrate caching into the Mercurial wire
protocol server as robustly as possible such that servers can
aggressively cache responses and defer as much server load as
possible.
This commit represents the initial implementation of a general
caching layer in wire protocol version 2.
We define a new interface and behavior for a wire protocol cacher
in repository.py. (This is probably where a reviewer should look
first to understand what is going on.)
The bulk of the added code is in wireprotov2server.py, where we
define how a command can opt in to being cached and integrate
caching into command dispatching.
From a very high-level:
* A command can declare itself as cacheable by providing a callable
that can be used to derive a cache key.
* At dispatch time, if a command is cacheable, we attempt to
construct a cacher and use it for serving the request and/or
caching the request.
* The dispatch layer handles the bulk of the business logic for
caching, making cachers mostly "dumb content stores."
* The mechanism for invalidating cached entries (one of the harder
parts about caching in general) is by varying the cache key when
state changes. As such, cachers don't need to be concerned with
cache invalidation.
Initially, we've hooked up support for caching "manifestdata" and
"filedata" commands. These are the simplest to cache, as they should
be immutable over time. Caching of commands related to changeset
data is a bit harder (because cache validation is impacted by
changes to bookmarks, phases, etc). This will be implemented later.
(Strictly speaking, censoring a file should invalidate caches. I've
added an inline TODO to track this edge case.)
To prove it works, this commit implements a test-only extension
providing in-memory caching backed by an lrucachedict. A new test
showing this extension behaving properly is added. FWIW, the
cacher is ~50 lines of code, demonstrating the relative ease with
which a cache can be added to a server.
While the test cacher is not suitable for production workloads, just
for kicks I performed a clone of just the changeset and manifest data
for the mozilla-unified repository. With a fully warmed cache (of just
the manifest data since changeset data is not cached), server-side
CPU usage dropped from ~73s to ~28s. That's pretty significant and
demonstrates the potential that response caching has on server
scalability!
Differential Revision: https://phab.mercurial-scm.org/D4773
author | Gregory Szorc <gregory.szorc@gmail.com> |
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date | Wed, 26 Sep 2018 17:16:56 -0700 |
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1 $ . "$TESTDIR/histedit-helpers.sh" |
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2 |
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3 $ cat >> $HGRCPATH <<EOF |
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4 > [extensions] |
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5 > histedit= |
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6 > EOF |
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7 |
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8 $ initrepo () |
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9 > { |
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10 > hg init r |
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11 > cd r |
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12 > for x in a b c d e f ; do |
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13 > echo $x > $x |
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14 > hg add $x |
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15 > hg ci -m $x |
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16 > done |
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17 > } |
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18 |
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19 $ initrepo |
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20 |
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21 log before edit |
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22 $ hg log --graph |
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23 @ changeset: 5:652413bf663e |
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24 | tag: tip |
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25 | user: test |
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26 | date: Thu Jan 01 00:00:00 1970 +0000 |
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27 | summary: f |
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28 | |
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29 o changeset: 4:e860deea161a |
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30 | user: test |
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31 | date: Thu Jan 01 00:00:00 1970 +0000 |
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32 | summary: e |
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33 | |
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34 o changeset: 3:055a42cdd887 |
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35 | user: test |
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36 | date: Thu Jan 01 00:00:00 1970 +0000 |
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37 | summary: d |
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38 | |
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39 o changeset: 2:177f92b77385 |
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40 | user: test |
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41 | date: Thu Jan 01 00:00:00 1970 +0000 |
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42 | summary: c |
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43 | |
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44 o changeset: 1:d2ae7f538514 |
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45 | user: test |
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46 | date: Thu Jan 01 00:00:00 1970 +0000 |
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47 | summary: b |
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48 | |
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49 o changeset: 0:cb9a9f314b8b |
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50 user: test |
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51 date: Thu Jan 01 00:00:00 1970 +0000 |
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52 summary: a |
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53 |
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54 |
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55 edit the history |
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56 $ hg histedit 177f92b77385 --commands - 2>&1 << EOF | fixbundle |
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57 > drop 177f92b77385 c |
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58 > pick e860deea161a e |
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59 > pick 652413bf663e f |
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60 > pick 055a42cdd887 d |
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61 > EOF |
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62 |
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63 log after edit |
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64 $ hg log --graph |
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65 @ changeset: 4:f518305ce889 |
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66 | tag: tip |
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67 | user: test |
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68 | date: Thu Jan 01 00:00:00 1970 +0000 |
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69 | summary: d |
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70 | |
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71 o changeset: 3:a4f7421b80f7 |
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72 | user: test |
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73 | date: Thu Jan 01 00:00:00 1970 +0000 |
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74 | summary: f |
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75 | |
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76 o changeset: 2:ee283cb5f2d5 |
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77 | user: test |
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78 | date: Thu Jan 01 00:00:00 1970 +0000 |
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79 | summary: e |
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80 | |
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81 o changeset: 1:d2ae7f538514 |
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82 | user: test |
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83 | date: Thu Jan 01 00:00:00 1970 +0000 |
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84 | summary: b |
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85 | |
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86 o changeset: 0:cb9a9f314b8b |
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87 user: test |
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88 date: Thu Jan 01 00:00:00 1970 +0000 |
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89 summary: a |
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90 |
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91 |
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92 Check histedit_source |
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93 |
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94 $ hg log --debug --rev f518305ce889 |
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95 changeset: 4:f518305ce889c07cb5bd05522176d75590ef3324 |
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96 tag: tip |
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97 phase: draft |
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98 parent: 3:a4f7421b80f79fcc59fff01bcbf4a53d127dd6d3 |
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99 parent: -1:0000000000000000000000000000000000000000 |
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100 manifest: 4:d3d4f51c157ff242c32ff745d4799aaa26ccda44 |
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101 user: test |
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102 date: Thu Jan 01 00:00:00 1970 +0000 |
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103 files+: d |
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104 extra: branch=default |
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105 extra: histedit_source=055a42cdd88768532f9cf79daa407fc8d138de9b |
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106 description: |
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107 d |
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108 |
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109 |
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110 |
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111 manifest after edit |
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112 $ hg manifest |
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113 a |
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114 b |
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115 d |
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116 e |
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117 f |
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118 |
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119 Drop the last changeset |
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120 |
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121 $ hg histedit ee283cb5f2d5 --commands - 2>&1 << EOF | fixbundle |
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122 > pick ee283cb5f2d5 e |
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123 > pick a4f7421b80f7 f |
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124 > drop f518305ce889 d |
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125 > EOF |
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126 $ hg log --graph |
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127 @ changeset: 3:a4f7421b80f7 |
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128 | tag: tip |
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129 | user: test |
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130 | date: Thu Jan 01 00:00:00 1970 +0000 |
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131 | summary: f |
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132 | |
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133 o changeset: 2:ee283cb5f2d5 |
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134 | user: test |
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135 | date: Thu Jan 01 00:00:00 1970 +0000 |
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136 | summary: e |
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137 | |
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138 o changeset: 1:d2ae7f538514 |
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139 | user: test |
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140 | date: Thu Jan 01 00:00:00 1970 +0000 |
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141 | summary: b |
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142 | |
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143 o changeset: 0:cb9a9f314b8b |
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144 user: test |
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145 date: Thu Jan 01 00:00:00 1970 +0000 |
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146 summary: a |
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147 |
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148 |
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149 $ hg histedit cb9a9f314b8b --commands - 2>&1 << EOF | fixbundle |
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150 > pick cb9a9f314b8b a |
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151 > pick ee283cb5f2d5 e |
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152 > EOF |
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153 hg: parse error: missing rules for changeset a4f7421b80f7 |
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154 (use "drop a4f7421b80f7" to discard, see also: 'hg help -e histedit.config') |
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155 $ hg --config histedit.dropmissing=True histedit cb9a9f314b8b --commands - 2>&1 << EOF | fixbundle |
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156 > EOF |
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157 hg: parse error: no rules provided |
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158 (use strip extension to remove commits) |
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159 $ hg --config histedit.dropmissing=True histedit cb9a9f314b8b --commands - 2>&1 << EOF | fixbundle |
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160 > pick cb9a9f314b8b a |
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161 > pick ee283cb5f2d5 e |
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162 > EOF |
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163 $ hg log --graph |
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164 @ changeset: 1:e99c679bf03e |
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165 | tag: tip |
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166 | user: test |
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167 | date: Thu Jan 01 00:00:00 1970 +0000 |
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168 | summary: e |
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169 | |
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170 o changeset: 0:cb9a9f314b8b |
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171 user: test |
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172 date: Thu Jan 01 00:00:00 1970 +0000 |
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173 summary: a |
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174 |