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Tag: cassandra

Cassandra cluster migration story

14.07.2016 (July 14, 2016)14.07.2016 (July 14, 2016) adminComputersLeave a comment

This is a simple story how we migrated a live production cluster with all its data into a new cluster, all without downtime. Old cluster: 60 c4.4xlarge instances Cassandra 2.1.12, 256 vnodes per host Each instance had two 1500 GB GP2 EBS disks. This matches the c4.4xlarge EBS bandwidth quite well as max bandwidth for …

How NoSQL will meet RDBMS in the future

28.09.2010 (September 28, 2010) garoComputers / Programming2 Comments

The NoSQL versus RDBMS war started a few years ago and as the new technologies are starting to get more mature it seems that the two different camps will be moving towards each other. [read more…]

Example how to model your data into nosql with cassandra

25.09.2010 (September 25, 2010)04.10.2010 (October 4, 2010) garoComputers / Programming11 Comments

We have built a facebook style “messenger” into our web site which uses cassandra as storage backend. I’m describing the data schema to server as a simple example how cassandra (and nosql in general) can be used in practice…

Cassandra operation success ratio survey results

23.09.2010 (September 23, 2010) garoComputersLeave a comment

It’s known that in Cassandra the compaction hurts the node performance so that the node might miss some requests. That’s why it’s important to handle these situations and the client needs to retry the operation into another working host. We have been storing performance data from each cassandra request which we do into our five …

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