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Rolling With Eventual Consistency or the Pros and Cons of a Dynamo Style Key-Value Store

Great educational post by Casey Rosenthal on Basho’s blog about the radically different approach of data modelling when using non-relational storage engines or non-queryable data models.

In a previous post I wrote about the different mindset that a software engineer should have when building for a key-value database as opposed to a relational database. When working with a relational database, you describe the model first and then query the data later. With a key-value database, you focus first on what you want the result of the query to look like, and then work backward toward a model.

A different way to look at it is that the advantage of the Dynamo’s style high availability key-value store doesn’t come for free. In the world of distributed systems there’s always a trade-off and you need to carefully choose each component of the architecture to match the requirements, but also be aware of the concenssions or complexity you’ll have to accept in other parts of the system.

Original title and link: Rolling With Eventual Consistency or the Pros and Cons of a Dynamo Style Key-Value Store (NoSQL database©myNoSQL)

via: http://basho.com/blog/technical/2012/09/18/Rolling-with-Eventual-Consistency/