metalink

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Deletions are marked like this. Additions are marked like this.
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* '''Launchpad Entry''': UbuntuSpec:foo
 * '''Created''': [[Date(19-04-2007T20:35IST)]]
 * '''Contributors''':
 * '''Packages affected''':
 * '''See also''': SpecTemplate		  * '''Launchpad Entry''': [https://blueprints.launchpad.net/ubuntu-cdimage/+spec/segmented-downloading Metalink]
 * '''Created''': [[Date(2007-04-19T21:00:54Z)]]
 * '''Contributors''': [https://launchpad.net/~shirishag75]
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As of right now,
As of right now, whenever a release comes there is lot of strain on the ubuntu servers as well as on the torrents. The idea is to do intelligent load-balancing while at the same time giving high speed download speed to the user without a single point of failure.
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  * Bob is the maintainer for the boot process for Ubuntu. In the Dapper cycle, he would like to work on getting the boot time down to two seconds from boot manager to GDM screen. He creates an entry for the specification in Launchpad, proposes it for the UBZ sprint, and starts writing out a braindump of it in the Ubuntu wiki. Magnus, who is in charge of UBZ scheduling, thinks it sounds fishy but approves it to make sure that the change is discussed and documented properly. He marks it as priority Medium because he isn't sure Bob will have time free for implementing it during Dapper.

  * Pedro works on Malone, in Launchpad. Before UBZ, he remembers that the dependency handling in the bug tracker is really not optimal. He writes out a Summary and Rationale in a Launchpad wiki page, registers it as a specification in Launchpad, and suggests it for UBZ. Monica, Launchpad manageress, thinks that this is really not the time to be talking about it and rejects the application for UBZ. He then indicates it for the next conference, UBB, and marks its priority is Low.

  * Jason is an Ubuntu and Rosetta user. He has noticed that changes made to translations are making their way into language packs but not to the upstream versions, and adds a specification that describes a way for getting upstream to use language packs. Monica also has a plan for this but hadn't described it in a spec, so she adds it to the UBZ spec list, and adds Carlos, Rosetta maintainer, as drafter for it.		   * Bob has a 100 mbps line but he is disappointed at first when the download is slow and then due to some issue the mirror finally breaks down. -1 experience from him.

  * Rachel is downloading through the torrent but finds there aren't enough no. of seeders hence she is not able to max out her speeds.

  * Conanical server breaks down as no. of people leeching from the server goes up. Loss of time for everybody. Maybe strain on other parts of the site also (guessing).
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This specification covers feature specifications for Ubuntu and Launchpad. It is not meant as a more general specification format. Any computer connected to the net and wants to download a ubuntu .iso & its derivatives.
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A specification should be built with the following considerations:

  * The person implementing it may not be the person writing it. It should be clear enough for someone to be able to read it and have a clear path towards implementing it. If it doesn't, it needs more detail.

  * That the use cases covered in the specification should be practical situations, not contrived issues.

  * Limitations and issues discovered during the creation of a specification should be clearly pointed out so that they can be dealt with explicitly.

  * If you don't know enough to be able to competently write a spec, you should either get help or research the problem further. Avoid spending time making up a solution: base yourself on your peers' opinions and prior work.

Specific issues related to particular sections are described further below.

=== Summary ===

The summary should not attempt to say '''why''' the spec is being defined, just '''what''' is being specified.

=== Rationale ===

This should be the description of '''why''' this spec is being defined.

=== Scope and Use Cases ===

While not always required, but in many cases they bring much better clarity to the scope and scale of the specification than could be obtained by talking in abstract terms.

=== Implementation Plan ===

This section is usually broken down into subsections, such as the packages being affected, data and system migration where necessary, user interface requirements and pictures (photographs of drawings on paper work well).		 People who are on high-speed bandwidth are either not able to max out their download speed or if they do max out they stress the server quite a bit. Instead of it if there is a .metalink file also then the user would be able to download his file in segments from different servers, as well as torrent , thereby reducing time to complete while at the same there is no single point of failure. Also he is able to download from the mirror which is closer to him.

== Feature list of .metalink ==

    * Standard format for listing multiple mirrors for redundancy and/or automatic accelerated (segmented) downloads.
    * Combines FTP and HTTP with Peer-to-peer (P2P, shared bandwidth).
    * Simplifies advanced download features, layout, and user experience.
    * Automatic checksum verification; No separate MD5/SHA-1 file or manual process for integrity verification.
    * Automatic error recovery and repair of corrupted downloads.
    * No Single Point of Failure (SPOF) like FTP or HTTP URLs. More fault tolerant.
    * Stores more descriptive and useful information for software distribution.
    * Backward compatible with regular hyperlinks.
    * Automatic load balancing distributes traffic so individual servers are under less strain.
    * No long confusing list of possibly outdated Mirrors and P2P links.
    * Automated creating, editing, and validating is easy with standard text processing tools.
    * In a format browsers and other tools can already process (even if they might not make use of it yet).
    * Makes the download process simpler for users (automatic selection of language, Operating System, location, etc).
    * Uniquely identifies files, so even if all references to it in the Metalink stop working, the same exact file can be found in other places.
    * Share a library of files between filesharing applications with a small .metalink.
    * Congratulations, you're the first person to read this far.
    * Can finish P2P downloads even if files are no longer shared.
    * For FTP/HTTP, an updated client is needed, but not a separate client like some types of P2P.
    * NO changes or separate services needed on the server side, like a "tracker" etc. Users can create Metalinks for files anyone is hosting and share them.
    * Useful for automatic updating programs when new versions are released.
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To implement a specification, the assignee should observe the use cases carefully, and follow the design specified. He should make note of places in which he has strayed from the design section, adding rationale describing why this happened. This is important so that next iterations of this specification (and new specifications that touch upon this subject) can use the specification as a reference.

The implementation is very dependent on the type of feature to be implemented. Refer to the team leader for further suggestions and guidance on this topic.		 Add .metalink to all release pages from http://cdimage.ubuntu.com .

== Code ==
{{{
<?xml version="1.0" encoding="UTF-8"?>
<metalink version="3.0" xmlns="http://www.metalinker.org/"
  origin="http://download.packages.ro/metalink"
  type="static" pubdate="Mon Mar 19 11:02:13 2007"
  generator="Metalink Gen - http://metalink.packages.ro"
  refreshdate="Mon Mar 19 11:02:13 2007">

  <publisher>
    <name>package resources</name>
    <url>http://www.packages.ro</url>
  </publisher>

  

  <description></description>
  <tags>linux,debian</tags>
  <identity>debian</identity>
  <version>31r5</version>

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    <resources>

      

     
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     <url type="http" location="br" preference="10">http://debian.pop-sc.rnp.br/mirror/debian-cd/3.1_r5/i386/iso-dvd/debian-31r5-i386-binary-1.iso</url>
     <url type="http" location="br" preference="10">http://linorg.usp.br/iso/debian/3.1_r5/i386/iso-dvd/debian-31r5-i386-binary-1.iso</url>
     <url type="http" location="br" preference="10">http://sft.if.usp.br/debian-cd/3.1_r5/i386/iso-dvd/debian-31r5-i386-binary-1.iso</url>
     <url type="http" location="ca" preference="10">http://debian.yorku.ca/debian-cd/3.1_r5/i386/iso-dvd/debian-31r5-i386-binary-1.iso</url>
     <url type="http" location="cl" preference="10">http://ftp.cl.debian.org/debian-cd/3.1_r5/i386/iso-dvd/debian-31r5-i386-binary-1.iso</url>
     <url type="http" location="hr" preference="10">http://ftp.carnet.hr/debian-cd/images/3.1_r5/i386/iso-dvd/debian-31r5-i386-binary-1.iso</url>
     <url type="http" location="hr" preference="10">http://ftp.hr.debian.org/debian-cd/3.1_r5/i386/iso-dvd/debian-31r5-i386-binary-1.iso</url>
     <url type="http" location="hr" preference="10">http://ftp.irb.hr/debian-cd/3.1_r5/i386/iso-dvd/debian-31r5-i386-binary-1.iso</url>
     <url type="http" location="hr" preference="10">http://iso.linux.hr/debian/3.1_r5/i386/iso-dvd/debian-31r5-i386-binary-1.iso</url>
     <url type="http" location="cz" preference="10">http://debian.sh.cvut.cz/debian-cd/3.1_r5/i386/iso-dvd/debian-31r5-i386-binary-1.iso</url>
     <url type="http" location="cz" preference="10">http://ftp.zcu.cz/pub/linux/debian-cd/3.1_r5/i386/iso-dvd/debian-31r5-i386-binary-1.iso</url>
     <url type="http" location="dk" preference="10">http://ftp.dk.debian.org/debian-cd/3.1_r5/i386/iso-dvd/debian-31r5-i386-binary-1.iso</url>
     <url type="http" location="dk" preference="10">http://mirrors.telianet.dk/pub/mirrors/cdimage.debian.org/3.1_r5/i386/iso-dvd/debian-31r5-i386-binary-1.iso</url>
     <url type="http" location="fi" preference="10">http://ftp.fi.debian.org/debian-cd/3.1_r5/i386/iso-dvd/debian-31r5-i386-binary-1.iso</url>
     <url type="http" location="fi" preference="10">http://ftp.funet.fi/pub/linux/mirrors/debian-cdimage/3.1_r5/i386/iso-dvd/debian-31r5-i386-binary-1.iso</url>
     <url type="http" location="fi" preference="10">http://ftp.jyu.fi/ftp/pub/linux/debian-cd/3.1_r5/i386/iso-dvd/debian-31r5-i386-binary-1.iso</url>
     <url type="http" location="fr" preference="10">http://debian.ens-cachan.fr/ftp/debian-cd/3.1_r5/i386/iso-dvd/debian-31r5-i386-binary-1.iso</url>
     <url type="http" location="fr" preference="10">http://debian.mines.inpl-nancy.fr/debian-cd/3.1_r5/i386/iso-dvd/debian-31r5-i386-binary-1.iso</url>
     <url type="http" location="fr" preference="10">http://debian.mirror.inra.fr/debian-cd/3.1_r5/i386/iso-dvd/debian-31r5-i386-binary-1.iso</url>
     <url type="http" location="fr" preference="10">http://ftp.u-strasbg.fr/isos/Debian/3.1_r5/i386/iso-dvd/debian-31r5-i386-binary-1.iso</url>
     <url type="http" location="fr" preference="10">http://ftp2.fr.debian.org/pub/debian-cd/3.1_r5/i386/iso-dvd/debian-31r5-i386-binary-1.iso</url>
     <url type="http" location="fr" preference="10">http://webb.ens-cachan.fr/debian-cd/3.1_r5/i386/iso-dvd/debian-31r5-i386-binary-1.iso</url>
     <url type="http" location="de" preference="10">http://debian.uni-essen.de/debian-cd/3.1_r5/i386/iso-dvd/debian-31r5-i386-binary-1.iso</url>
     <url type="http" location="de" preference="10">http://ftp-stud.fht-esslingen.de/debian-cd/3.1_r5/i386/iso-dvd/debian-31r5-i386-binary-1.iso</url>
     <url type="http" location="de" preference="10">http://ftp.de.debian.org/debian-cd/3.1_r5/i386/iso-dvd/debian-31r5-i386-binary-1.iso</url>
     <url type="http" location="de" preference="10">http://ftp.gwdg.de/pub/linux/debian/debian-cd/3.1_r5/i386/iso-dvd/debian-31r5-i386-binary-1.iso</url>
     <url type="http" location="de" preference="10">http://ftp.hosteurope.de/mirror/ftp.debian.org/debian-cd/3.1_r5/i386/iso-dvd/debian-31r5-i386-binary-1.iso</url>
     <url type="http" location="de" preference="10">http://ftp.tiscali.de/pub/debian/debian-cd/3.1_r5/i386/iso-dvd/debian-31r5-i386-binary-1.iso</url>
     <url type="http" location="de" preference="10">http://ftp.uni-bayreuth.de/linux/Debian/debian-cd/3.1_r5/i386/iso-dvd/debian-31r5-i386-binary-1.iso</url>
     <url type="http" location="de" preference="10">http://sunsite.informatik.rwth-aachen.de/ftp/pub/Linux/debian-cd/3.1_r5/i386/iso-dvd/debian-31r5-i386-binary-1.iso</url>
     <url type="http" location="uk" preference="10">http://ftp.ticklers.org/debian-cd/3.1_r5/i386/iso-dvd/debian-31r5-i386-binary-1.iso</url>
     <url type="http" location="uk" preference="10">http://www.mirrorservice.org/sites/cdimage.debian.org/debian-cd/3.1_r5/i386/iso-dvd/debian-31r5-i386-binary-1.iso</url>
     <url type="http" location="gr" preference="10">http://ftp.ntua.gr/pub/linux/debian-cd/3.1_r5/i386/iso-dvd/debian-31r5-i386-binary-1.iso</url>
     <url type="http" location="gr" preference="10">http://ftp.softnet.tuc.gr/ftp/linux/debian-cd/3.1_r5/i386/iso-dvd/debian-31r5-i386-binary-1.iso</url>
     <url type="http" location="hk" preference="10">http://ftp.hk.debian.org/debian-cd/3.1_r5/i386/iso-dvd/debian-31r5-i386-binary-1.iso</url>
     <url type="http" location="ie" preference="10">http://ftp.esat.net/pub/linux/debian-cd/3.1_r5/i386/iso-dvd/debian-31r5-i386-binary-1.iso</url>
     <url type="http" location="ie" preference="10">http://ftp.ie.debian.org/debian-cd/3.1_r5/i386/iso-dvd/debian-31r5-i386-binary-1.iso</url>
     <url type="http" location="il" preference="10">http://debian.co.il/debian-cd/3.1_r5/i386/iso-dvd/debian-31r5-i386-binary-1.iso</url>
     <url type="http" location="it" preference="10">http://debian.fastbull.org/debian-cd/3.1_r5/i386/iso-dvd/debian-31r5-i386-binary-1.iso</url>
     <url type="http" location="it" preference="10">http://debian.fastweb.it/debian-cd/3.1_r5/i386/iso-dvd/debian-31r5-i386-binary-1.iso</url>
     <url type="http" location="it" preference="10">http://ftp.it.debian.org/debian-cd/3.1_r5/i386/iso-dvd/debian-31r5-i386-binary-1.iso</url>
     <url type="http" location="it" preference="10">http://ftp.unina.it/pub/linux/distributions/debian/debian-cd/3.1_r5/i386/iso-dvd/debian-31r5-i386-binary-1.iso</url>
     <url type="http" location="jp" preference="10">http://ftp.jaist.ac.jp/pub/Linux/Debian-CD/3.1_r5/i386/iso-dvd/debian-31r5-i386-binary-1.iso</url>
     <url type="http" location="jp" preference="10">http://ftp.jp.debian.org/debian-cd/3.1_r5/i386/iso-dvd/debian-31r5-i386-binary-1.iso</url>
     <url type="http" location="jp" preference="10">http://ftp.yz.yamagata-u.ac.jp/debian-cd/3.1_r5/i386/iso-dvd/debian-31r5-i386-binary-1.iso</url>
     <url type="http" location="kr" preference="10">http://ftp.kr.debian.org/debian-cd/3.1_r5/i386/iso-dvd/debian-31r5-i386-binary-1.iso</url>
     <url type="http" location="nl" preference="10">http://debian.essentkabel.com/debian-cd/3.1_r5/i386/iso-dvd/debian-31r5-i386-binary-1.iso</url>
     <url type="http" location="nl" preference="10">http://ftp.nl.debian.org/debian-cd/3.1_r5/i386/iso-dvd/debian-31r5-i386-binary-1.iso</url>
     <url type="http" location="nl" preference="10">http://ftp.tiscali.nl/debian-iso/3.1_r5/i386/iso-dvd/debian-31r5-i386-binary-1.iso</url>
     <url type="http" location="nl" preference="10">http://mirror.scarlet-internet.nl/pub/debian-cd/3.1_r5/i386/iso-dvd/debian-31r5-i386-binary-1.iso</url>
     <url type="http" location="no" preference="10">http://ftp.no.debian.org/pub/linux/debian-iso/3.1_r5/i386/iso-dvd/debian-31r5-i386-binary-1.iso</url>
     <url type="http" location="pl" preference="10">http://ftp.icm.edu.pl/pub/Linux/debian-cd/3.1_r5/i386/iso-dvd/debian-31r5-i386-binary-1.iso</url>
     <url type="http" location="pl" preference="10">http://ftp.pl.debian.org/debian-cd/3.1_r5/i386/iso-dvd/debian-31r5-i386-binary-1.iso</url>
     <url type="http" location="pl" preference="10">http://ftp.vectranet.pl/debian-cd/3.1_r5/i386/iso-dvd/debian-31r5-i386-binary-1.iso</url>
     <url type="http" location="ro" preference="10">http://ftp.ro.debian.org/debian-cd/3.1_r5/i386/iso-dvd/debian-31r5-i386-binary-1.iso</url>
     <url type="http" location="ro" preference="10">http://ftp.lug.ro/debian-cd/3.1_r5/i386/iso-dvd/debian-31r5-i386-binary-1.iso</url>
     <url type="http" location="ru" preference="10">http://debian.nsu.ru/debian-cd/3.1_r5/i386/iso-dvd/debian-31r5-i386-binary-1.iso</url>
     <url type="http" location="ru" preference="10">http://ftp.psn.ru/debian-cd/3.1_r5/i386/iso-dvd/debian-31r5-i386-binary-1.iso</url>
     <url type="http" location="ru" preference="10">http://ftp.ru.debian.org/pub/Linux/debian-cd/3.1_r5/i386/iso-dvd/debian-31r5-i386-binary-1.iso</url>
     <url type="http" location="za" preference="10">http://ftp.sun.ac.za/ftp/iso-images/debian/3.1_r5/i386/iso-dvd/debian-31r5-i386-binary-1.iso</url>
     <url type="http" location="es" preference="10">http://ftp.caliu.info/debian-cd/3.1_r5/i386/iso-dvd/debian-31r5-i386-binary-1.iso</url>
     <url type="http" location="es" preference="10">http://ftp.cica.es/debian-cd/3.1_r5/i386/iso-dvd/debian-31r5-i386-binary-1.iso</url>
     <url type="http" location="es" preference="10">http://ftp.es.debian.org/debian-cd/3.1_r5/i386/iso-dvd/debian-31r5-i386-binary-1.iso</url>
     <url type="http" location="es" preference="10">http://ftp.gva.es/mirror/debian-cd/3.1_r5/i386/iso-dvd/debian-31r5-i386-binary-1.iso</url>
     <url type="http" location="es" preference="10">http://ftp.rediris.es/pub/linux/distributions/debian-cd/3.1_r5/i386/iso-dvd/debian-31r5-i386-binary-1.iso</url>
     <url type="http" location="se" preference="10">http://cdimage.debian.org/debian-cd/3.1_r5/i386/iso-dvd/debian-31r5-i386-binary-1.iso</url>
     <url type="http" location="se" preference="10">http://ftp.port80.se/debian-cd/3.1_r5/i386/iso-dvd/debian-31r5-i386-binary-1.iso</url>
     <url type="http" location="se" preference="10">http://ftp.se.debian.org/debian-iso/3.1_r5/i386/iso-dvd/debian-31r5-i386-binary-1.iso</url>
     <url type="http" location="se" preference="10">http://ftp.sunet.se/pub/os/Linux/distributions/debian-iso/3.1_r5/i386/iso-dvd/debian-31r5-i386-binary-1.iso</url>
     <url type="http" location="ch" preference="10">http://ftp.ch.debian.org/debian-cd/3.1_r5/i386/iso-dvd/debian-31r5-i386-binary-1.iso</url>
     <url type="http" location="ch" preference="10">http://mirror.switch.ch/ftp/mirror/debian-cd/3.1_r5/i386/iso-dvd/debian-31r5-i386-binary-1.iso</url>
     <url type="http" location="tw" preference="10">http://ftp.tw.debian.org/debian-cd/3.1_r5/i386/iso-dvd/debian-31r5-i386-binary-1.iso</url>
     <url type="http" location="tw" preference="10">http://linux.cdpa.nsysu.edu.tw/Debian/debian-cd/3.1_r5/i386/iso-dvd/debian-31r5-i386-binary-1.iso</url>
     <url type="http" location="tr" preference="10">http://ftp.tr.debian.org/debian-cd/3.1_r5/i386/iso-dvd/debian-31r5-i386-binary-1.iso</url>
     <url type="http" location="ua" preference="10">http://debian.org.ua/debian-cd/3.1_r5/i386/iso-dvd/debian-31r5-i386-binary-1.iso</url>
     <url type="http" location="us" preference="10">http://aurolinux.mit.edu/debian-cd/3.1_r5/i386/iso-dvd/debian-31r5-i386-binary-1.iso</url>
     <url type="http" location="us" preference="10">http://carroll.aset.psu.edu/pub/linux/distributions/debian-cd/3.1_r5/i386/iso-dvd/debian-31r5-i386-binary-1.iso</url>
     <url type="http" location="us" preference="10">http://debian.cites.uiuc.edu/pub/debian-cd/3.1_r5/i386/iso-dvd/debian-31r5-i386-binary-1.iso</url>
     <url type="http" location="us" preference="10">http://debian.fifi.org/debian-cd/3.1_r5/i386/iso-dvd/debian-31r5-i386-binary-1.iso</url>
     <url type="http" location="us" preference="10">http://debian.midco.net/pub/iso/3.1_r5/i386/iso-dvd/debian-31r5-i386-binary-1.iso</url>
     <url type="http" location="us" preference="10">http://debian.mirrors.tds.net/pub/linux/ftp.debian.org/debian-cd/3.1_r5/i386/iso-dvd/debian-31r5-i386-binary-1.iso</url>
     <url type="http" location="us" preference="10">http://debian.osuosl.org/debian-cdimage/3.1_r5/i386/iso-dvd/debian-31r5-i386-binary-1.iso</url>
     <url type="http" location="us" preference="10">http://ftp-mirror.internap.com/pub/debian-cd/3.1_r5/i386/iso-dvd/debian-31r5-i386-binary-1.iso</url>
     <url type="http" location="us" preference="10">http://ftp.keystealth.org/debian-cd/3.1_r5/i386/iso-dvd/debian-31r5-i386-binary-1.iso</url>
     <url type="http" location="us" preference="10">http://ftp.ndlug.nd.edu/mirrors/debian-cd/3.1_r5/i386/iso-dvd/debian-31r5-i386-binary-1.iso</url>
     <url type="http" location="us" preference="10">http://mirrors.kernel.org/debian-cd/3.1_r5/i386/iso-dvd/debian-31r5-i386-binary-1.iso</url>
     <url type="http" location="us" preference="10">http://mirrors.usc.edu/pub/linux/distributions/debian-cd/3.1_r5/i386/iso-dvd/debian-31r5-i386-binary-1.iso</url>

       <url type="magnet" preference="90"> magnet:?xt=urn:sha1:ae0e0870bb7d5802a13899315a51e6b50453ec6e&amp;xt=urn:ed2k:c54534fc9dd188034240fd56dbd6e060&amp;xl=4682901504&amp;dn=debian-31r5-i386-binary-1.iso
       </url>



    </resources>
   </file>
  </files>
</metalink>

}}}
Line 65: Line 353:
The specification process requires experienced people to drive it. More documentation on the process should be produced.

The drafting of a specification requires English skills and a very good understanding of the problem. It must also describe things to an extent that someone else could implement. This is a difficult set of conditions to ensure throughout all the specifications added.

There is a lot of difficulty in gardening obsolete, unwanted and abandoned specifications in the Wiki.		  Most of the clients have not implemented the 3.0 specification fully as of now. For e.g. KGet has some support in the SVN(development) http://commit-digest.org/issues/2007-02-25/
Line 73: Line 358:
We'll have a first public session on this on the first Monday in UBZ. == Refrences ==
* [http://64.78.3.44/ Metalink ]
* [http://64.78.3.44/why.html Metalink/why]
* [http://en.wikipedia.org/wiki/Segmented_downloading Wikipedia]
* [http://en.wikipedia.org/wiki/Metalink Wikipedia entry about metalink]
* [http://metalink.packages.ro/ Site for .metalink packages]
* [http://64.78.3.44/Metalink_3.0_Spec.txt Specification for metalink]
* [http://video.google.com/videoplay?docid=-2559650775733253402&q=FOSDEM+2007+-+Metalink+Lightning+Talk+by+Bram+Neijt Ligtning Talk]

== Comments ==

Summary

  • Officially support .metalink format also for downloading .iso packages. Give links of the same on the most often .iso packages like ubuntu, kubuntu, xubuntu & edubuntu etc.

Rationale

As of right now, whenever a release comes there is lot of strain on the ubuntu servers as well as on the torrents. The idea is to do intelligent load-balancing while at the same time giving high speed download speed to the user without a single point of failure.

Use Cases

  • Bob has a 100 mbps line but he is disappointed at first when the download is slow and then due to some issue the mirror finally breaks down. -1 experience from him.
  • Rachel is downloading through the torrent but finds there aren't enough no. of seeders hence she is not able to max out her speeds.
  • Conanical server breaks down as no. of people leeching from the server goes up. Loss of time for everybody. Maybe strain on other parts of the site also (guessing).

Scope

Any computer connected to the net and wants to download a ubuntu .iso & its derivatives.

Design

People who are on high-speed bandwidth are either not able to max out their download speed or if they do max out they stress the server quite a bit. Instead of it if there is a .metalink file also then the user would be able to download his file in segments from different servers, as well as torrent , thereby reducing time to complete while at the same there is no single point of failure. Also he is able to download from the mirror which is closer to him.

  • Standard format for listing multiple mirrors for redundancy and/or automatic accelerated (segmented) downloads.
  • Combines FTP and HTTP with Peer-to-peer (P2P, shared bandwidth).
  • Simplifies advanced download features, layout, and user experience.
  • Automatic checksum verification; No separate MD5/SHA-1 file or manual process for integrity verification.
  • Automatic error recovery and repair of corrupted downloads.
  • No Single Point of Failure (SPOF) like FTP or HTTP URLs. More fault tolerant.
  • Stores more descriptive and useful information for software distribution.
  • Backward compatible with regular hyperlinks.
  • Automatic load balancing distributes traffic so individual servers are under less strain.
  • No long confusing list of possibly outdated Mirrors and P2P links.
  • Automated creating, editing, and validating is easy with standard text processing tools.
  • In a format browsers and other tools can already process (even if they might not make use of it yet).
  • Makes the download process simpler for users (automatic selection of language, Operating System, location, etc).
  • Uniquely identifies files, so even if all references to it in the Metalink stop working, the same exact file can be found in other places.
  • Share a library of files between filesharing applications with a small .metalink.
  • Congratulations, you're the first person to read this far.
  • Can finish P2P downloads even if files are no longer shared.
  • For FTP/HTTP, an updated client is needed, but not a separate client like some types of P2P.
  • NO changes or separate services needed on the server side, like a "tracker" etc. Users can create Metalinks for files anyone is hosting and share them.
  • Useful for automatic updating programs when new versions are released.

Implementation

Add .metalink to all release pages from http://cdimage.ubuntu.com .

Code

<?xml version="1.0" encoding="UTF-8"?>
<metalink version="3.0" xmlns="http://www.metalinker.org/"
  origin="http://download.packages.ro/metalink"
  type="static" pubdate="Mon Mar 19 11:02:13 2007"
  generator="Metalink Gen - http://metalink.packages.ro" 
  refreshdate="Mon Mar 19 11:02:13 2007">

  <publisher>
    <name>package resources</name>
    <url>http://www.packages.ro</url>
  </publisher>

  

  <description></description>
  <tags>linux,debian</tags>
  <identity>debian</identity>
  <version>31r5</version>

  <files> 
   <file name="debian-31r5-i386-binary-1.iso">
    
    <os>Linux-x86</os>

    <size>4682901504</size>

    <verification>
     <hash type="md5">ec58b59b4585cd16b921ddcbff818941</hash>
     <hash type="sha1">ae0e0870bb7d5802a13899315a51e6b50453ec6e</hash>
     <hash type="ed2k">c54534fc9dd188034240fd56dbd6e060</hash>

     
     <pieces length="33554432" type="sha1">
      <hash piece="0">531c5920e02b64a16dc1d64bca1b849f35aecd20</hash>
      <hash piece="1">74d221f69761a90b2a900b51dffd351eba056bd5</hash>
      <hash piece="2">fdfa79d59a88095a611b47909fa3c0f60610a8a9</hash>
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     <url type="http" location="nl" preference="10">http://ftp.nl.debian.org/debian-cd/3.1_r5/i386/iso-dvd/debian-31r5-i386-binary-1.iso</url>
     <url type="http" location="nl" preference="10">http://ftp.tiscali.nl/debian-iso/3.1_r5/i386/iso-dvd/debian-31r5-i386-binary-1.iso</url>
     <url type="http" location="nl" preference="10">http://mirror.scarlet-internet.nl/pub/debian-cd/3.1_r5/i386/iso-dvd/debian-31r5-i386-binary-1.iso</url>
     <url type="http" location="no" preference="10">http://ftp.no.debian.org/pub/linux/debian-iso/3.1_r5/i386/iso-dvd/debian-31r5-i386-binary-1.iso</url>
     <url type="http" location="pl" preference="10">http://ftp.icm.edu.pl/pub/Linux/debian-cd/3.1_r5/i386/iso-dvd/debian-31r5-i386-binary-1.iso</url>
     <url type="http" location="pl" preference="10">http://ftp.pl.debian.org/debian-cd/3.1_r5/i386/iso-dvd/debian-31r5-i386-binary-1.iso</url>
     <url type="http" location="pl" preference="10">http://ftp.vectranet.pl/debian-cd/3.1_r5/i386/iso-dvd/debian-31r5-i386-binary-1.iso</url>
     <url type="http" location="ro" preference="10">http://ftp.ro.debian.org/debian-cd/3.1_r5/i386/iso-dvd/debian-31r5-i386-binary-1.iso</url>
     <url type="http" location="ro" preference="10">http://ftp.lug.ro/debian-cd/3.1_r5/i386/iso-dvd/debian-31r5-i386-binary-1.iso</url>
     <url type="http" location="ru" preference="10">http://debian.nsu.ru/debian-cd/3.1_r5/i386/iso-dvd/debian-31r5-i386-binary-1.iso</url>
     <url type="http" location="ru" preference="10">http://ftp.psn.ru/debian-cd/3.1_r5/i386/iso-dvd/debian-31r5-i386-binary-1.iso</url>
     <url type="http" location="ru" preference="10">http://ftp.ru.debian.org/pub/Linux/debian-cd/3.1_r5/i386/iso-dvd/debian-31r5-i386-binary-1.iso</url>
     <url type="http" location="za" preference="10">http://ftp.sun.ac.za/ftp/iso-images/debian/3.1_r5/i386/iso-dvd/debian-31r5-i386-binary-1.iso</url>
     <url type="http" location="es" preference="10">http://ftp.caliu.info/debian-cd/3.1_r5/i386/iso-dvd/debian-31r5-i386-binary-1.iso</url>
     <url type="http" location="es" preference="10">http://ftp.cica.es/debian-cd/3.1_r5/i386/iso-dvd/debian-31r5-i386-binary-1.iso</url>
     <url type="http" location="es" preference="10">http://ftp.es.debian.org/debian-cd/3.1_r5/i386/iso-dvd/debian-31r5-i386-binary-1.iso</url>
     <url type="http" location="es" preference="10">http://ftp.gva.es/mirror/debian-cd/3.1_r5/i386/iso-dvd/debian-31r5-i386-binary-1.iso</url>
     <url type="http" location="es" preference="10">http://ftp.rediris.es/pub/linux/distributions/debian-cd/3.1_r5/i386/iso-dvd/debian-31r5-i386-binary-1.iso</url>
     <url type="http" location="se" preference="10">http://cdimage.debian.org/debian-cd/3.1_r5/i386/iso-dvd/debian-31r5-i386-binary-1.iso</url>
     <url type="http" location="se" preference="10">http://ftp.port80.se/debian-cd/3.1_r5/i386/iso-dvd/debian-31r5-i386-binary-1.iso</url>
     <url type="http" location="se" preference="10">http://ftp.se.debian.org/debian-iso/3.1_r5/i386/iso-dvd/debian-31r5-i386-binary-1.iso</url>
     <url type="http" location="se" preference="10">http://ftp.sunet.se/pub/os/Linux/distributions/debian-iso/3.1_r5/i386/iso-dvd/debian-31r5-i386-binary-1.iso</url>
     <url type="http" location="ch" preference="10">http://ftp.ch.debian.org/debian-cd/3.1_r5/i386/iso-dvd/debian-31r5-i386-binary-1.iso</url>
     <url type="http" location="ch" preference="10">http://mirror.switch.ch/ftp/mirror/debian-cd/3.1_r5/i386/iso-dvd/debian-31r5-i386-binary-1.iso</url>
     <url type="http" location="tw" preference="10">http://ftp.tw.debian.org/debian-cd/3.1_r5/i386/iso-dvd/debian-31r5-i386-binary-1.iso</url>
     <url type="http" location="tw" preference="10">http://linux.cdpa.nsysu.edu.tw/Debian/debian-cd/3.1_r5/i386/iso-dvd/debian-31r5-i386-binary-1.iso</url>
     <url type="http" location="tr" preference="10">http://ftp.tr.debian.org/debian-cd/3.1_r5/i386/iso-dvd/debian-31r5-i386-binary-1.iso</url>
     <url type="http" location="ua" preference="10">http://debian.org.ua/debian-cd/3.1_r5/i386/iso-dvd/debian-31r5-i386-binary-1.iso</url>
     <url type="http" location="us" preference="10">http://aurolinux.mit.edu/debian-cd/3.1_r5/i386/iso-dvd/debian-31r5-i386-binary-1.iso</url>
     <url type="http" location="us" preference="10">http://carroll.aset.psu.edu/pub/linux/distributions/debian-cd/3.1_r5/i386/iso-dvd/debian-31r5-i386-binary-1.iso</url>
     <url type="http" location="us" preference="10">http://debian.cites.uiuc.edu/pub/debian-cd/3.1_r5/i386/iso-dvd/debian-31r5-i386-binary-1.iso</url>
     <url type="http" location="us" preference="10">http://debian.fifi.org/debian-cd/3.1_r5/i386/iso-dvd/debian-31r5-i386-binary-1.iso</url>
     <url type="http" location="us" preference="10">http://debian.midco.net/pub/iso/3.1_r5/i386/iso-dvd/debian-31r5-i386-binary-1.iso</url>
     <url type="http" location="us" preference="10">http://debian.mirrors.tds.net/pub/linux/ftp.debian.org/debian-cd/3.1_r5/i386/iso-dvd/debian-31r5-i386-binary-1.iso</url>
     <url type="http" location="us" preference="10">http://debian.osuosl.org/debian-cdimage/3.1_r5/i386/iso-dvd/debian-31r5-i386-binary-1.iso</url>
     <url type="http" location="us" preference="10">http://ftp-mirror.internap.com/pub/debian-cd/3.1_r5/i386/iso-dvd/debian-31r5-i386-binary-1.iso</url>
     <url type="http" location="us" preference="10">http://ftp.keystealth.org/debian-cd/3.1_r5/i386/iso-dvd/debian-31r5-i386-binary-1.iso</url>
     <url type="http" location="us" preference="10">http://ftp.ndlug.nd.edu/mirrors/debian-cd/3.1_r5/i386/iso-dvd/debian-31r5-i386-binary-1.iso</url>
     <url type="http" location="us" preference="10">http://mirrors.kernel.org/debian-cd/3.1_r5/i386/iso-dvd/debian-31r5-i386-binary-1.iso</url>
     <url type="http" location="us" preference="10">http://mirrors.usc.edu/pub/linux/distributions/debian-cd/3.1_r5/i386/iso-dvd/debian-31r5-i386-binary-1.iso</url>      

       <url type="magnet" preference="90">         magnet:?xt=urn:sha1:ae0e0870bb7d5802a13899315a51e6b50453ec6e&amp;xt=urn:ed2k:c54534fc9dd188034240fd56dbd6e060&amp;xl=4682901504&amp;dn=debian-31r5-i386-binary-1.iso
       </url>     



    </resources>
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</metalink>

Outstanding Issues

BoF agenda and discussion

Refrences

* [http://64.78.3.44/ Metalink ] * [http://64.78.3.44/why.html Metalink/why] * [http://en.wikipedia.org/wiki/Segmented_downloading Wikipedia] * [http://en.wikipedia.org/wiki/Metalink Wikipedia entry about metalink] * [http://metalink.packages.ro/ Site for .metalink packages] * [http://64.78.3.44/Metalink_3.0_Spec.txt Specification for metalink] * [http://video.google.com/videoplay?docid=-2559650775733253402&q=FOSDEM+2007+-+Metalink+Lightning+Talk+by+Bram+Neijt Ligtning Talk]

Comments

CategorySpec

metalink (last edited 2008-08-06 16:21:29 by localhost)