The most important thing to know in Cassandra data modeling: The primary key

February 22, 2016



The title for this article could really stand alone, but I’m not going to just leave it at that! Yes, this is a fundamental rule for Apache Cassandra, but I’m going to take some time to explain why that statement is correct. With relational data modeling, you can start with the primary key, but effective data models in an RDBMS are much more about the foreign key relationships and relational constraints betw Read More..

The importance of single-partition operations in Cassandra

February 1, 2016


In this blog post, we’ll explain the reason why all Cassandra experts and evangelists promote single-partition operations. We’ll see in details all the benefits that single-partition operations can provide in term of operation, consistency and system stability.

Atomicity & Isolation

Mutations (INSERT/UPDATE/DELETE) to all columns of a partition are guaranteed to be atomic e.g. the upd Read More..

Analytics at GitHub with Apache Cassandra

March 11, 2014



John Nunemaker


John Nunemaker Programmer at GitHub



In the interest of getting back into writing, I want to break the seal with a simple “what have I been up to and thinking about lately” style post. Hopefully future topics will be more focused and frequent.

For the past year, I have been working on data and analytics at GitHub. We have grown from 1 to 4 full time people, with reall Read More..

HSHA Thrift Server Corruption in Cassandra 2.0.0 – 2.0.5

March 10, 2014



Jonathan Ellis


Jonathan Ellis Apache Cassandra Project Chair, Co-founder at DataStax


Thrift HSHA users should run, not walk, to upgrade

Cassandra’s legacy Thrift API (distinct from the native CQL protocol) allows pluggable socket-handling server implementations. The default sync server creates a thread per client and is more performant for typical numbers of (usually pooled) clie Read More..

SessionM Chooses Cassandra Over MongoDB For Greater Scalability And Fault Tolerance

January 28, 2014



Thomas Vachon: Principal Operations Architect at SessionM

Thanks for joining us to talk about your Apache Cassandra use case. What does SessionM do for its customers?

SessionM is a mobile rewards platform funded by advertisers. Developers put our platform in their apps and advertisers get paid to engage with power users in those apps. The users get rewarded with mPoints for performing actions inside the apps li Read More..

Dating Site Zoosk Breaks Up with MySQL; Migrates to Apache Cassandra for Persistent Notifications

January 27, 2014


Glenn Engstrand: Senior Software Engineer at Zoosk

TL;DR: Zoosk is a leading online dating company that learns as you click in order to pair you with singles you’re likely to be mutually attracted to. With the #1 grossing online dating app in the Apple App Store, Zoosk is a market leader in mobile dating. Available in over 80 countries and translated into 25 languages, Zoosk is a truly global online dating platform. Read More..

India Cassandra Users Meetup Video/Slides: Getting Started with Apache Cassandra with Patrick McFadin

December 4, 2013


Abstract Patrick McFadin , Chief Evangelist for Apache Cassandra at DataStax, presents an \n introduction to Cassandra as a key player in database technologies. Both large and small companies \n alike chose Apache Cassandra as their database solution and Patrick will be presenting on why they \n made that choice. Read More..

Sirca Moves from MySQL to Cassandra to Process 10,000,000 Instruments of Financial Data

December 4, 2013


Apache Cassandra, essentially, is going to take over one of Sircas databases its actually a MySQL database, in judiciary. \n The data theyre putting into Cassandra is end-of-day pricing information and corporate actions information such as mergers, acquisitions, renames, and reference information about different stocks all around the world. Sirca has around 10,000,000 instruments. \n Sirca is hosting Cass Read More..

DataStax Enterprise Testing on Google Compute Engine

December 4, 2013


DataStax is proud to be partnering with Google on the recently announced general availability of Google Compute Engine. \n We briefly described our test of DataStax Enterprise in a guest post on the Google Cloud Platform Blog. Here are more details on the test we ran. Read More..


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