Cassandra

Dynamic snitching is something we’ve done in Cassandra as far back as 0.6.5, but can still be a source of confusion for many. In this post, I’m going to do my best to demystify everything and anything you could want to know about it, as well as ... [More] preview some of the improvements that have been made for our upcoming 1.2 release later this year.read more [Less]

One piece of feedback we received on last week’s Cassandra 2012 Summit was that we needed to have a track and/or presentations geared for those of you who are brand new to Apache Cassandra. To be sure, we had lots of great, in-depth talks at the show, but they did require some previous familiarity with Cassandra.read more

The 2012 Cassandra Summit, held at the Santa Clara convention center, was by all accounts an outstanding success. With well over 800 attendees, attendance was nearly double last year’s event, and more than quadruple the number of the first summit ... [More] held just two years ago. The all-star speaker line up presented no-fluff sessions that demonstrated how real-world, big data problems are being solved with Cassandra; and the continuous Meet-The-Experts Q&A sessions jumpstarted countless new projects.  It’s safe to say that attendees felt the Summit was well worth their investment.read more [Less]

I have been following the development of Yarn and Mesos and done some tinkering over the past few months. If you have not ever heard of these projects get some information here:http://nosql.mypopescu.com/post/27840903966/hadoop-yarn-beyond-mapreduce https://github.com/mesos/mesos/wiki/read more

The Cassandra Summit is underway with over 800+ attendees in Santa Clara! Many great sessions and speakers ahead!

Apache Cassandra is a distributed store. When you distribute data over many machines, doing joins at read time is expensive in the general case (compared to what can be done on a single host), as you might have to join over data that is not stored ... [More] on the same physical host. That is why Cassandra has always encouraged denormalization instead of joins, i.e. physical collocation of the data that is queried together.read more [Less]

Cassandra uses streaming in several places. Streaming is used when a node joins or leaves the ring. For example, when a node is decomissioned using nodetool decommission it streams its data to other nodes before leaving the ring. This value can be ... [More] adjusted in both the confirguration file and during runtime using nodetool or JMX. How to do it… In the conf/cassandra.yaml file the default value can be set:read more [Less]

The Cassandra Summit 2012 is next week! The schedule and session details are published. Here are some sessions I’m most excited about: Building a Cassandra Based Application from Scratch, by Patrick McFadin. While Cassandra has had excellent ... [More] documentation for a while now, there’s still a gap to jump “hello world” and real application design.read more [Less]

This article is one in a series of quick-hit interviews with companies using Apache Cassandra and/or DataStax Enterprise for key parts of their business.  For this interview, we talked with Christof Roduner who is the co-founder and COO of Scandit. ... [More] DataStax: Christof, tell us what you guys do at Scandit. Christof: Scandit provides mobile app developers with a very fast and user-friendly Barcode Scanner.read more [Less]

 What is Ansible?Ansible is a configuration management and deployment system, like Puppet, Capistrano, Fabric, and Chef. Its aim is to be radically simple and let you use your existing scripts to help with cluster configuration and software deployment whenever possible. Here are the ways that Ansible differentiates itself.Simplicityread more