NoSQL databases scale by adding more commodity servers. With more commodity servers come increased costs and complexities. Some NoSQL systems are better at this than others and need less. Continue reading Operations costs are the Achille’s heel of NoSQL
1. Do you know what your queries will look like ? In traditional SQL you design your data model to represent your business objects. Your queries can then evolve over time and can be ad-hoc. You can even create views, materialized or otherwise, to facilitate even more complex analytical queries. Cassandra does not offer the flexibility of traditional SQL. While your data model can … Continue reading Ten Questions to Consider Before Choosing Cassandra
I’ve written before that Cassandra’s achilles’ heel is devops: Storage, redundancy and performance are expanded by adding more nodes. This can happen during normal business hours as long as consistency parameters are met. Same applies to node replacements. As the number of servers grows be prepared to hire a devops army or look for a managed solution. Datastax offering helps but still not enough. Even … Continue reading Ordered Sets and Logs in Cassandra vs SQL
After using Cassandra for 3 years since version 0.8.5, I thought I’d put together a blurb on lessons learned. Here it goes! Use Cases What works Anything that involves high speed collection of data for analysis in the background or via batch. For example: Logging and data collection Web servers Mobile devices Internet of things Sensors Finance Market data logging Transaction logging Trading activity Record … Continue reading Cassandra: Lessons Learned
At first I wanted to name this article “My personal list of grievances against Apache Cassandra”, but I decided to take a more positive approach. Only Java developers need apply Surely you can use Cassandra with non-Java clients but the reality is that administering and maintaining Cassandra itself requires very significant knowledge of Java and there is no way around it. The engineer must know … Continue reading Things I wish Apache Cassandra was better at
