Mercurial > hg
view tests/test-hgweb-filelog.t @ 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> |
|---|---|
| date | Fri, 09 Oct 2015 11:22:01 -0700 |
| parents | 4b0fc75f9403 |
| children | 37290f2f2c3b |
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#require serve $ hg init test $ cd test $ echo b > b $ hg ci -Am "b" adding b $ echo a > a $ hg ci -Am "first a" adding a $ hg tag -r 1 a-tag $ hg bookmark -r 1 a-bookmark $ hg rm a $ hg ci -m "del a" $ hg branch a-branch marked working directory as branch a-branch (branches are permanent and global, did you want a bookmark?) $ echo b > a $ hg ci -Am "second a" adding a $ hg rm a $ hg ci -m "del2 a" $ hg mv b c $ hg ci -m "mv b" $ echo c >> c $ hg ci -m "change c" $ hg log -p changeset: 7:46c1a66bd8fc branch: a-branch tag: tip user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: change c diff -r c9637d3cc8ef -r 46c1a66bd8fc c --- a/c Thu Jan 01 00:00:00 1970 +0000 +++ b/c Thu Jan 01 00:00:00 1970 +0000 @@ -1,1 +1,2 @@ b +c changeset: 6:c9637d3cc8ef branch: a-branch user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: mv b diff -r 958bd88be4eb -r c9637d3cc8ef b --- a/b Thu Jan 01 00:00:00 1970 +0000 +++ /dev/null Thu Jan 01 00:00:00 1970 +0000 @@ -1,1 +0,0 @@ -b diff -r 958bd88be4eb -r c9637d3cc8ef c --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/c Thu Jan 01 00:00:00 1970 +0000 @@ -0,0 +1,1 @@ +b changeset: 5:958bd88be4eb branch: a-branch user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: del2 a diff -r 3f41bc784e7e -r 958bd88be4eb a --- a/a Thu Jan 01 00:00:00 1970 +0000 +++ /dev/null Thu Jan 01 00:00:00 1970 +0000 @@ -1,1 +0,0 @@ -b changeset: 4:3f41bc784e7e branch: a-branch user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: second a diff -r 292258f86fdf -r 3f41bc784e7e a --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/a Thu Jan 01 00:00:00 1970 +0000 @@ -0,0 +1,1 @@ +b changeset: 3:292258f86fdf user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: del a diff -r 94c9dd5ca9b4 -r 292258f86fdf a --- a/a Thu Jan 01 00:00:00 1970 +0000 +++ /dev/null Thu Jan 01 00:00:00 1970 +0000 @@ -1,1 +0,0 @@ -a changeset: 2:94c9dd5ca9b4 user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: Added tag a-tag for changeset 5ed941583260 diff -r 5ed941583260 -r 94c9dd5ca9b4 .hgtags --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/.hgtags Thu Jan 01 00:00:00 1970 +0000 @@ -0,0 +1,1 @@ +5ed941583260248620985524192fdc382ef57c36 a-tag changeset: 1:5ed941583260 bookmark: a-bookmark tag: a-tag user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: first a diff -r 6563da9dcf87 -r 5ed941583260 a --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/a Thu Jan 01 00:00:00 1970 +0000 @@ -0,0 +1,1 @@ +a changeset: 0:6563da9dcf87 user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: b diff -r 000000000000 -r 6563da9dcf87 b --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/b Thu Jan 01 00:00:00 1970 +0000 @@ -0,0 +1,1 @@ +b $ hg serve -n test -p $HGPORT -d --pid-file=hg.pid -E errors.log $ cat hg.pid >> $DAEMON_PIDS tip - two revisions $ (get-with-headers.py localhost:$HGPORT 'log/tip/a') 200 Script output follows <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en-US"> <head> <link rel="icon" href="/static/hgicon.png" type="image/png" /> <meta name="robots" content="index, nofollow" /> <link rel="stylesheet" href="/static/style-paper.css" type="text/css" /> <script type="text/javascript" src="/static/mercurial.js"></script> <title>test: a history</title> <link rel="alternate" type="application/atom+xml" href="/atom-log/tip/a" title="Atom feed for test:a" /> <link rel="alternate" type="application/rss+xml" href="/rss-log/tip/a" title="RSS feed for test:a" /> </head> <body> <div class="container"> <div class="menu"> <div class="logo"> <a href="https://mercurial-scm.org/"> <img src="/static/hglogo.png" alt="mercurial" /></a> </div> <ul> <li><a href="/shortlog/tip">log</a></li> <li><a href="/graph/tip">graph</a></li> <li><a href="/tags">tags</a></li> <li><a href="/bookmarks">bookmarks</a></li> <li><a href="/branches">branches</a></li> </ul> <ul> <li><a href="/rev/tip">changeset</a></li> <li><a href="/file/tip">browse</a></li> </ul> <ul> <li><a href="/file/tip/a">file</a></li> <li><a href="/diff/tip/a">diff</a></li> <li><a href="/comparison/tip/a">comparison</a></li> <li><a href="/annotate/tip/a">annotate</a></li> <li class="active">file log</li> <li><a href="/raw-file/tip/a">raw</a></li> </ul> <ul> <li><a href="/help">help</a></li> </ul> <div class="atom-logo"> <a href="/atom-log/3f41bc784e7e/a" title="subscribe to atom feed"> <img class="atom-logo" src="/static/feed-icon-14x14.png" alt="atom feed" /> </a> </div> </div> <div class="main"> <h2 class="breadcrumb"><a href="/">Mercurial</a> </h2> <h3>log a</h3> <form class="search" action="/log"> <p><input name="rev" id="search1" type="text" size="30" /></p> <div id="hint">Find changesets by keywords (author, files, the commit message), revision number or hash, or <a href="/help/revsets">revset expression</a>.</div> </form> <div class="navigate"> <a href="/log/tip/a?revcount=30">less</a> <a href="/log/tip/a?revcount=120">more</a> | <a href="/log/5ed941583260/a">(0)</a> <a href="/log/tip/a">tip</a> </div> <table class="bigtable"> <thead> <tr> <th class="age">age</th> <th class="author">author</th> <th class="description">description</th> </tr> </thead> <tbody class="stripes2"> <tr> <td class="age">Thu, 01 Jan 1970 00:00:00 +0000</td> <td class="author">test</td> <td class="description"> <a href="/rev/3f41bc784e7e">second a</a> <span class="branchname">a-branch</span> </td> </tr> <tr> <td class="age">Thu, 01 Jan 1970 00:00:00 +0000</td> <td class="author">test</td> <td class="description"> <a href="/rev/5ed941583260">first a</a> <span class="tag">a-tag</span> <span class="tag">a-bookmark</span> </td> </tr> </tbody> </table> <div class="navigate"> <a href="/log/tip/a?revcount=30">less</a> <a href="/log/tip/a?revcount=120">more</a> | <a href="/log/5ed941583260/a">(0)</a> <a href="/log/tip/a">tip</a> </div> </div> </div> <script type="text/javascript">process_dates()</script> </body> </html> second version - two revisions $ (get-with-headers.py localhost:$HGPORT 'log/4/a') 200 Script output follows <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en-US"> <head> <link rel="icon" href="/static/hgicon.png" type="image/png" /> <meta name="robots" content="index, nofollow" /> <link rel="stylesheet" href="/static/style-paper.css" type="text/css" /> <script type="text/javascript" src="/static/mercurial.js"></script> <title>test: a history</title> <link rel="alternate" type="application/atom+xml" href="/atom-log/tip/a" title="Atom feed for test:a" /> <link rel="alternate" type="application/rss+xml" href="/rss-log/tip/a" title="RSS feed for test:a" /> </head> <body> <div class="container"> <div class="menu"> <div class="logo"> <a href="https://mercurial-scm.org/"> <img src="/static/hglogo.png" alt="mercurial" /></a> </div> <ul> <li><a href="/shortlog/4">log</a></li> 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href="/">Mercurial</a> </h2> <h3>log a</h3> <form class="search" action="/log"> <p><input name="rev" id="search1" type="text" size="30" /></p> <div id="hint">Find changesets by keywords (author, files, the commit message), revision number or hash, or <a href="/help/revsets">revset expression</a>.</div> </form> <div class="navigate"> <a href="/log/1/a?revcount=30">less</a> <a href="/log/1/a?revcount=120">more</a> | <a href="/log/5ed941583260/a">(0)</a> <a href="/log/tip/a">tip</a> </div> <table class="bigtable"> <thead> <tr> <th class="age">age</th> <th class="author">author</th> <th class="description">description</th> </tr> </thead> <tbody class="stripes2"> <tr> <td class="age">Thu, 01 Jan 1970 00:00:00 +0000</td> <td class="author">test</td> <td class="description"> <a href="/rev/5ed941583260">first a</a> <span class="tag">a-tag</span> <span class="tag">a-bookmark</span> </td> </tr> </tbody> </table> <div class="navigate"> <a href="/log/1/a?revcount=30">less</a> <a 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href="/graph">graph</a></li> <li><a href="/tags">tags</a></li> <li><a href="/bookmarks">bookmarks</a></li> <li><a href="/branches">branches</a></li> </ul> <ul> <li><a href="/help">help</a></li> </ul> </div> <div class="main"> <h2 class="breadcrumb"><a href="/">Mercurial</a> </h2> <h3>error</h3> <form class="search" action="/log"> <p><input name="rev" id="search1" type="text" size="30"></p> <div id="hint">Find changesets by keywords (author, files, the commit message), revision number or hash, or <a href="/help/revsets">revset expression</a>.</div> </form> <div class="description"> <p> An error occurred while processing your request: </p> <p> a@6563da9dcf87: not found in manifest </p> </div> </div> </div> <script type="text/javascript">process_dates()</script> </body> </html> [1] should show base link, use spartan because it shows it $ (get-with-headers.py localhost:$HGPORT 'log/tip/c?style=spartan') 200 Script output follows <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd"> <html> <head> <link rel="icon" href="/static/hgicon.png" type="image/png"> <meta name="robots" content="index, nofollow" /> <link rel="stylesheet" href="/static/style.css" type="text/css" /> <script type="text/javascript" src="/static/mercurial.js"></script> <title>test: c history</title> <link rel="alternate" type="application/atom+xml" href="/atom-log/tip/c" title="Atom feed for test:c"> <link rel="alternate" type="application/rss+xml" href="/rss-log/tip/c" title="RSS feed for test:c"> </head> <body> <div class="buttons"> <a href="/log?style=spartan">changelog</a> <a href="/shortlog?style=spartan">shortlog</a> <a href="/graph?style=spartan">graph</a> <a href="/tags?style=spartan">tags</a> <a href="/branches?style=spartan">branches</a> <a href="/file/tip/c?style=spartan">file</a> <a href="/annotate/tip/c?style=spartan">annotate</a> <a href="/help?style=spartan">help</a> <a type="application/rss+xml" href="/rss-log/tip/c">rss</a> <a type="application/atom+xml" href="/atom-log/tip/c" title="Atom feed for test:c">atom</a> </div> <h2><a href="/">Mercurial</a> / c revision history</h2> <p>navigate: <small class="navigate"><a href="/log/c9637d3cc8ef/c?style=spartan">(0)</a> <a href="/log/tip/c?style=spartan">tip</a> </small></p> <table class="logEntry parity0"> <tr> <th class="label"><span class="age">Thu, 01 Jan 1970 00:00:00 +0000</span>:</th> <th class="firstline"><a href="/rev/46c1a66bd8fc?style=spartan">change c</a></th> </tr> <tr> <th class="revision">revision 1:</th> <td class="node"> <a href="/file/46c1a66bd8fc/c?style=spartan">46c1a66bd8fc</a> <a href="/diff/46c1a66bd8fc/c?style=spartan">(diff)</a> <a href="/annotate/46c1a66bd8fc/c?style=spartan">(annotate)</a> </td> </tr> <tr> <th class="author">author:</th> <td class="author">test</td> </tr> <tr> <th class="date">date:</th> <td class="date">Thu, 01 Jan 1970 00:00:00 +0000</td> </tr> </table> <table class="logEntry parity1"> <tr> <th class="label"><span class="age">Thu, 01 Jan 1970 00:00:00 +0000</span>:</th> <th class="firstline"><a href="/rev/c9637d3cc8ef?style=spartan">mv b</a></th> </tr> <tr> <th class="revision">revision 0:</th> <td class="node"> <a href="/file/c9637d3cc8ef/c?style=spartan">c9637d3cc8ef</a> <a href="/diff/c9637d3cc8ef/c?style=spartan">(diff)</a> <a href="/annotate/c9637d3cc8ef/c?style=spartan">(annotate)</a> </td> </tr> <tr> <th>base:</th> <td> <a href="/file/1e88685f5dde/b?style=spartan"> b@1e88685f5dde </a> </td> </tr> <tr> <th class="author">author:</th> <td class="author">test</td> </tr> <tr> <th class="date">date:</th> <td class="date">Thu, 01 Jan 1970 00:00:00 +0000</td> </tr> </table> <script type="text/javascript">process_dates()</script> <div class="logo"> <a href="https://mercurial-scm.org/"> <img src="/static/hglogo.png" width=75 height=90 border=0 alt="mercurial"></a> </div> </body> </html> rss log $ (get-with-headers.py localhost:$HGPORT 'rss-log/tip/a') 200 Script output follows <?xml version="1.0" encoding="ascii"?> <rss version="2.0"> <channel> <link>http://*:$HGPORT/</link> (glob) <language>en-us</language> <title>test: a history</title> <description>a revision history</description> <item> <title>second a</title> <link>http://*:$HGPORT/log3f41bc784e7e/a</link> (glob) <description><![CDATA[second a]]></description> <author>test</author> <pubDate>Thu, 01 Jan 1970 00:00:00 +0000</pubDate> </item> <item> <title>first a</title> <link>http://*:$HGPORT/log5ed941583260/a</link> (glob) <description><![CDATA[first a]]></description> <author>test</author> <pubDate>Thu, 01 Jan 1970 00:00:00 +0000</pubDate> </item> </channel> </rss> atom log $ (get-with-headers.py localhost:$HGPORT 'atom-log/tip/a') 200 Script output follows <?xml version="1.0" encoding="ascii"?> <feed xmlns="http://www.w3.org/2005/Atom"> <id>http://*:$HGPORT/atom-log/tip/a</id> (glob) <link rel="self" href="http://*:$HGPORT/atom-log/tip/a"/> (glob) <title>test: a history</title> <updated>1970-01-01T00:00:00+00:00</updated> <entry> <title>[a-branch] second a</title> <id>http://*:$HGPORT/#changeset-3f41bc784e7e73035c6d47112c6cc7efb673adf8</id> (glob) <link href="http://*:$HGPORT/rev/3f41bc784e7e"/> (glob) <author> <name>test</name> <email>test</email> </author> <updated>1970-01-01T00:00:00+00:00</updated> <published>1970-01-01T00:00:00+00:00</published> <content type="xhtml"> <table xmlns="http://www.w3.org/1999/xhtml"> <tr> <th style="text-align:left;">changeset</th> <td>3f41bc784e7e</td> </tr> <tr> <th style="text-align:left;">branch</th> <td>a-branch</td> </tr> <tr> <th style="text-align:left;">bookmark</th> <td></td> </tr> <tr> <th style="text-align:left;">tag</th> <td></td> </tr> <tr> <th style="text-align:left;">user</th> <td>test</td> </tr> <tr> <th style="text-align:left;vertical-align:top;">description</th> <td>second a</td> </tr> <tr> <th style="text-align:left;vertical-align:top;">files</th> <td></td> </tr> </table> </content> </entry> <entry> <title>first a</title> <id>http://*:$HGPORT/#changeset-5ed941583260248620985524192fdc382ef57c36</id> (glob) <link href="http://*:$HGPORT/rev/5ed941583260"/> (glob) <author> <name>test</name> <email>test</email> </author> <updated>1970-01-01T00:00:00+00:00</updated> <published>1970-01-01T00:00:00+00:00</published> <content type="xhtml"> <table xmlns="http://www.w3.org/1999/xhtml"> <tr> <th style="text-align:left;">changeset</th> <td>5ed941583260</td> </tr> <tr> <th style="text-align:left;">branch</th> <td></td> </tr> <tr> <th style="text-align:left;">bookmark</th> <td>a-bookmark</td> </tr> <tr> <th style="text-align:left;">tag</th> <td>a-tag</td> </tr> <tr> <th style="text-align:left;">user</th> <td>test</td> </tr> <tr> <th style="text-align:left;vertical-align:top;">description</th> <td>first a</td> </tr> <tr> <th style="text-align:left;vertical-align:top;">files</th> <td></td> </tr> </table> </content> </entry> </feed> errors $ cat errors.log $ cd ..