In this tutorial we will set up a nearly production ready cluster of MongoDB instances with the following setup: – 3 replica sets (each replica set consisting of 3 mongod instances) – 3 config servers – 1 mongos server The Setup will be done on one physical server with 3 virtual machines. The virtual machines [...]

In the posts one and two I showed the problem and how to solve this in camel – we used a idempotent repository based on MongoDB. But Camel doesn’t come with a MongoDB repository class out of the box, so we have to implement it on our own… The first step is easy. We have [...]

In part one of this tutorial I showed the problem with events in a clustered environment from an architecture view. Now we want our hands dirty and implement a solution using Apache Camel and MongoDB. As you know Apache Camel implements the world famous enterprise integration patterns (EIP). The only thing we have to do [...]

MongoDB (from “humongous”) is an open source, scalable, high-performance, schema-free, document-oriented database written in the C++ programming language. One great feature of MongoDB are the replica sets (http://www.mongodb.org/). A replica set is a master-slave cluster with automatic fail over and automatic recovery of member nodes. Compared to classic master-slave clusters it will handle automatic election [...]

NoSQL vs. SQL – this is really an old topic. But with upcoming database projects like cassandra, CouchDB, MongoDB and many others it gets back into the focus. We asked our self which database is the right one for our project? We evaluated SQL databases as well as nosql databases… And decided to build our [...]

Last week I got the brand new MongoDB book “MongoDB: The Definitive Guide” (I’m sure will find it on your own – so here is no link to Amazon). The authors (Kristina Chodorow and Michael Dirolf) are members of the 10gen team (the company behind MongoDB). With 180 pages is the book not so big [...]