Re: Comment from MongoDB: Not an Apples-to-Apples comparison
Our study was a fair and valid comparison of the two products. Based on the study's parameters, Avalon provided the exact same hardware resources and enabled the same durability and failover setup for both Couchbase and MongoDB.
For the purposes of this test, preventing loss of data was one of the core parameters as this is a necessary feature for the types of enterprise clients we work with. Couchbase prevents loss of data by providing 2 additional replicas besides the master copy on every node. Each node consumes 2/3's of the computational and storage capacity for replica maintenance. With the 2 additional replicas, Couchbase provided the desired durability and failover support. Couchbase Server reads and writes on every node; MongoDB relies on a master/slave architecture that can only execute reads and writes on primary nodes. Because of this, both vendors use the identical amount of hardware but each is configured differently to optimize each product.
It is irrefutable that both MongoDB and Couchbase were placed on a level playing field for the test Avalon conducted.
Casey Green, EVP Corporate Strategy, Avalon Consulting, LLC