<img class="aligncenter" title="node.js logo" src="http://hackermedley.org/images/nodejs.png" alt="" width="527" height="270" />
A quick overview of a few interesting new web technologies: tornado, node.js and WebSockets. Listen and enjoy!

As always, we&#8217;d love to hear your thoughts and dreams and deepest desires.
If you want to learn more, check out these links:
<ul>
<li><a href="http://www.tornadoweb.org/">Tornado homepage</a></li>
<li><a href="http://nodejs.org">node.js</a> web page.</li>
<li><a href="http://lincolnloop.com/blog/2009/sep/15/using-django-inside-tornado-web-server/">Using Django on top of a Tornado web server</a>.</li>
<li>Ryan Dahl&#8217;s <a href="http://four.livejournal.com/">livejournal page</a> (the webcomic seems to be gone though!)</li>
<li><a href="http://www.kegel.com/c10k.html ">C10K problem </a>&#8211; why webservers need to handle 10,000 concurrent clients and move to event-based IO.</li>
<li>WebSockets <a href="http://dev.w3.org/html5/websockets/">JavaScript API</a>, <a href="http://tools.ietf.org/html/draft-hixie-thewebsocketprotocol-75">wire protocol</a>, <a href="http://devthought.com/blog/2009/12/nodejs-and-the-websocket-protocol/">in node.js</a>, <a href="http://bret.appspot.com/entry/web-sockets-in-tornado">in Tornado</a>.</li>
<li>A nice explanation of <a href="http://www.webdevelopmentbits.com/avoiding-long-polling">long polling</a> and other workarounds</li>
</ul>

<description>
A quick overview of a few interesting new web technologies: tornado, node.js and WebSockets. Listen and enjoy!
As always, we&amp;#8217;d love to hear your thoughts and dreams and deepest desires.
If you want to learn more, check out these links:

Tornado homepage
node.js web page.
Using Django on top of a Tornado web server.
Ryan Dahl&amp;#8217;s livejournal page (the webcomic seems to [...]</description>

A quick overview of a few interesting new web technologies: tornado, node.js and WebSockets. Listen and enjoy! As always, we&#8217;d love to hear your thoughts and dreams and deepest desires. If you want to learn more, check out these links: Tornado homepage node.js web page. Using Django on top of a Tornado web server. Ryan Dahl&#8217;s livejournal page (the webcomic seems to [...]

Episode 3: tornado, node.js and websockets

<img class="aligncenter" title="Google datacenter in Oregon" src="http://hackermedley.org/images/googledatacenter.jpg" alt="" width="500" height="375" />
In our second episode (12 minutes long), Alex and Nat talk about the new generation of &#8220;NoSQL&#8221; databases that have created a lot of interest among web developers; especially those lucky people dealing with thousands of simultaneous users and terabytes of data.

Please feel free to leave a comment below after you&#8217;ve listened to the episode. We&#8217;re still total newbies at this podcasting thing, so your feedback and encouragement are a big help!
If you want to learn more about NoSQL than what we covered in the show, check out these links:
<ul>
<li><a href="http://horicky.blogspot.com/2009/11/nosql-patterns.html">Nice introduction to all the basic concepts</a>: consistency models, replication, vector clocks.</li>
<li><a href="http://www.vineetgupta.com/2010/01/nosql-databases-part-1-landscape.html">A comparison of NoSQL alternatives</a> and a good braindump of the subject matter.</li>
<li><a href="http://www.allthingsdistributed.com/2007/10/amazons_dynamo.html ">Amazon Dynamo paper</a>. Great readable paper introducing the core concepts for massively scalable datastores.</li>
<li><a href="http://labs.google.com/papers/bigtable.html">BigTable paper</a>. Another cornerstone paper.</li>
<li><a href="http://bret.appspot.com/entry/how-friendfeed-uses-mysql">How FriendFeed uses MySQL to store schema-less data</a></li>
</ul>
The Big Guys:
<ul>
<li><a href="http://project-voldemort.com/">Voldemort</a></li>
<li><a href="http://incubator.apache.org/cassandra/">Cassandra</a></li>
<li><a href="http://wiki.apache.org/hadoop/HBase">HBase</a> &#8212; We didn&#8217;t get to this one, but it&#8217;s modelled on BigTable, and can replicate across geographically separated datacenters (Cassandra needs faster roundtrips). And it&#8217;s what Hadoop uses internally.</li>
</ul>
Midsized:
<ul>
<li><a href="http://www.mongodb.org">MongoDB</a> &#8212; Great for storing JSON objects.</li>
<li><a href="http://couchdb.apache.org/">CouchDB</a> &#8212; Erlang based, uses javascript as a query language.</li>
</ul>
Niche:
<ul>
<li><a href="http://code.google.com/p/redis">Redis</a> &#8212; memcached with persistence and useful list/set/ordered-set datatypes.</li>
<li><a href="http://code.google.com/p/redis/wiki/TwitterAlikeExample">Redis twitter implementation</a> &#8212; simple example of building a twitter-like system on top of redis.</li>
</ul>
Underlying Technology
<ul>
<li><a href="http://www.spiteful.com/2008/03/17/programmers-toolbox-part-3-consistent-hashing/">Consistent Hashing</a>.</li>
<li>Vector Clocks &#8212; See section 4.4 in the <a href="http://www.allthingsdistributed.com/2007/10/amazons_dynamo.html ">Amazon Dynamo paper</a>.</li>
<li>Important relationship between Consistency, Availability and Partition Tolerance, called the <a href="http://www.julianbrowne.com/article/viewer/brewers-cap-theorem">CAP Theorem</a>.</li>
</ul>
The image above is a picture of a Google datacenter in Oregon, where they no doubt run <a href="http://labs.google.com/papers/bigtable.html">BigTable</a>.

<description>
In our second episode (12 minutes long), Alex and Nat talk about the new generation of &amp;#8220;NoSQL&amp;#8221; databases that have created a lot of interest among web developers; especially those lucky people dealing with thousands of simultaneous users and terabytes of data.
Please feel free to leave a comment below after you&amp;#8217;ve listened to the episode. [...]</description>

In our second episode (12 minutes long), Alex and Nat talk about the new generation of &#8220;NoSQL&#8221; databases that have created a lot of interest among web developers; especially those lucky people dealing with thousands of simultaneous users and terabytes of data. Please feel free to leave a comment below after you&#8217;ve listened to the episode. [...]

Episode 2: A brief introduction to NoSQL databases

<img class=" aligncenter" title="Harald Welte presenting at the 26c3" src="http://hackermedley.org/images/haraldwelte.jpg" alt="" width="500" height="375" />
Welcome to Hacker Medley! We decided to try podcasting.
In our pilot show, Nat Friedman shares what he learned about mobile phone security at the 26th annual Chaos Communications Congress in Berlin.

<hr />It&#8217;s our first effort, so it&#8217;s a little rough. But please <a href="http://spreadsheets.google.com/viewform?formkey=dEZGWDlnOE94czNXbW5qRzVKUU5ILVE6MA">let us know what you think</a> so we can decide whether or not to keep making these!
If you want to learn more about the stuff Nat was describing, here are some handy links:
<ul>
<li><a href="http://events.ccc.de/congress/2009/Fahrplan/attachments/1479_26C3.Karsten.Nohl.GSM.pdf">GSM &#8212; SRSLY?</a> Karsten Nohl&#8217;s talk in which he revealed his project to generate rainbow tables for A5/1.</li>
<li><a href="http://openbsc.gnumonks.org/trac/wiki/OpenBSC">OpenBSC</a> Harald Welte&#8217;s project to create a GPL&#8217;d GSM Base Station Controller (and associated pieces) as a platform for security research.</li>
<li>A <a href="http://cgi.ebay.com/ALCATEL-LUCENT-ANDREW-UMTS-BTS-1120-BASE-STATION_W0QQitemZ260395856814QQcmdZViewItemQQptZLH_DefaultDomain_0?hash=item3ca0cd73ae#ht_510wt_1164">$250 Alcatel/Lucent BST on eBay</a>. Use this to provide OpenBSC with a radio link.</li>
<li><a href="http://openbts.sourceforge.net/">OpenBTS</a> Another effort to create an open source GSM network using a USRP (universal software radio peripheral).</li>
<li><a href="http://wiki.openezx.org/BP">A description of the baseband processor / application processor split</a> in mobile phones.</li>
<li>Interesting <a href="http://www.cryptophone.de/qa/intercept/index.html">information about GSM security</a> from the folks at CryptoPhone.</li>
<li><a href="https://svn.berlin.ccc.de/projects/airprobe/">Airprobe</a> &#8212; a GSM sniffer project.</li>
<li>Wikipedia&#8217;s explanation of <a href="http://en.wikipedia.org/wiki/Rainbow_table">rainbow tables</a>.</li>
</ul>
The image above is <a href="http://gnumonks.org/~laforge/weblog/">Harald Welte</a> <a href="http://events.ccc.de/congress/2009/Fahrplan/events/3535.en.html">presenting at the 26c3</a>.

<description>
Welcome to Hacker Medley! We decided to try podcasting.
In our pilot show, Nat Friedman shares what he learned about mobile phone security at the 26th annual Chaos Communications Congress in Berlin.
It&amp;#8217;s our first effort, so it&amp;#8217;s a little rough. But please let us know what you think so we can decide whether or not [...]</description>

Welcome to Hacker Medley! We decided to try podcasting. In our pilot show, Nat Friedman shares what he learned about mobile phone security at the 26th annual Chaos Communications Congress in Berlin. It&#8217;s our first effort, so it&#8217;s a little rough. But please let us know what you think so we can decide whether or not [...]

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