Marcel's World

Eventual Consistency

Marcel Neuhäusler — Sat, 27 Feb 2010 23:16:20 +0000

Two interesting blog posts I came across regarding "eventual consistency" and nosql databases.

Spyced: "Handling deletes in a distributed, eventually consistent system is a little tricky"

All Things Distributed: "Amazon SimpleDB has launched today with a new set of features giving the customer more control over which consistency and concurrency models to use in their database operations."

MagLev

Marcel Neuhäusler — Mon, 22 Feb 2010 17:35:23 +0000

Distributed Ruby with the MagLev VM

"GemStone team made a splash with MagLev at RailsConf '08 where they attracted a fair dose of attention from the attendees. Based on an existing GemStone/Smalltalk VM, it promised a lot of inherent advantages: 64-bit, JIT, years of VM optimizations, and built-in persistence and distribution layers. Since then the team has been making steady progress, which recently resulted in the announcement of the first public alpha."

.. deja-vue? .. or is the time finally here for those type of language-bound shared persistency layers? ..

My PCM System

Marcel Neuhäusler — Sun, 03 Jan 2010 00:00:52 +0000

I just finished the first release of my PCM (personal content management system). The system I built uses CouchDB, SimpleDB, and a few servlets written in Java to listen, store, aggregate, and publish all the content I produce on Twitter, delicious, NyTimes People, this blog, and other sites. The nice thing, I can still use the regular interface of all those sites to enter content, while in the background my system is gathering that content automatically. That content then gets stored twice, in a local database and in the "Amazon cloud". From where the content then gets published to the ticker page in my new blog: Neuhäusler Weekly.

.. and of course I already have a ton of ideas how I could improve the system :-) ..

Using Cassandra with Scala and Akka

Marcel Neuhäusler — Sat, 02 Jan 2010 06:27:15 +0000

Using Cassandra with Scala and Akka: "With all this talk about NoSQL and new programming languages I though I’d try getting Cassandra to work with Scala. Always being interested in productivity I wanted to know how easy and concise an integration would be."

..via Code Monkeyism..

eZ430-Chronos

Marcel Neuhäusler — Sat, 02 Jan 2010 06:27:15 +0000

eZ430-Chronos: "The world's first customizable development environment within a sports watch ... Priced at $49 Chronos is designed to provide all of the hardware and software needed to immediately begin development of wireless applications.."

.. the ultimate gift for a geek ..

Hadoop ..

Marcel Neuhäusler — Thu, 15 Oct 2009 21:10:50 +0000

Different Hadoop releated links:

Slides of Hadoop World in NYC, "Cascading is a feature rich API for defining and executing complex, scale-free, and fault tolerant data processing workflows on a Hadoop cluster", and a library to aid writing Hadoop jobs in Clojure.

How I Learned to Stop Worrying and Love Using a Lot of Disk Space to Scale

Marcel Neuhäusler — Wed, 23 Sep 2009 20:49:56 +0000

"The best way to implement joins with BigTable is: don't. You--pause for dramatic effect--duplicate data instead of normalize it. *shudder*"

.. it so reminds me of Lotus Notes .. but it all makes sense now ..

Google Noop

Marcel Neuhäusler — Tue, 22 Sep 2009 21:15:01 +0000

"Noop (pronounced noh-awp, like the machine instruction) is a new language experiment that attempts to blend the best lessons of languages old and new, while syntactically encouraging what we believe to be good coding practices and discouraging the worst offenses. Noop is initially targeted to run on the Java Virtual Machine."

.. no subclassing but dependency injection .. based on the jvm and scala .. interesting ..

NoSQL debrief

Marcel Neuhäusler — Wed, 12 Aug 2009 19:30:20 +0000

.. SQL still needed? .. I believe so .. but there are new database systems/concepts showing up in the Web2.0 space .. "braindump: NOSQL debrief" and "Notes from the NoSQL Meetup" ..

Cloudera

Marcel Neuhäusler — Sun, 17 May 2009 06:31:29 +0000

"Cloudera provides a training program aimed at producers and users of large volumes of data. These sessions, exercises and tutorials will teach you what you need to know to work more deeply with Hadoop, as well as related business intelligence platforms such as Hive."

.. they offer good tutorials online for free .. including a "Hadoop Training Virtual Machine" .. thanks Cloudera! ..