* '''Launchpad Entry''': [[https://blueprints.launchpad.net/ubuntu-cdimage/+spec/segmented-downloading|Metalink]]
 * '''Created''': <<Date(2007-04-19T21:00:54Z)>>
 * '''Contributors''': [[https://launchpad.net/~shirishag75]]



== 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.  

== 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.


== 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>

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    <os>Linux-x86</os>

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

}}}

== Resources ==

* Hampus Wessman has created a GUI metalink editor http://hampus.vox.nu/metalink/ . In some time he plans to add preference value so while making the .metalink file it checks which servers support resuming & enhance their value while marking down the ones whose server doesn't support resuming. 


== Outstanding Issues ==

 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/


== 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 ==

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CategorySpec