Hi, Last week we had a discussion at work regarding setting up our new Hadoop cluster(s). One of the things that has changed is that the importance of the Hadoop stack is growing so we want to be "more available".
One of the points we talked about was setting up the cluster in such a way that the nodes are physically located in two separate datacenters (on opposite sides of the same city) with a big network connection in between. We're currently talking about a cluster in the 50 nodes range, but that will grow over time. The advantages I see: - More CPU power available for jobs. - The data is automatically copied between the datacenters as long as we configure them to be different 'racks'. The disadvantages I see: - If the network goes out then one half is dead and the other half will most likely go to safemode because the recovering of the missing replicas will fill up the disks fast. What things should we consider also? Has anyone any experience with such a setup? Is it a good idea to do this? What are better options for us to consider? Thanks for any input. -- Best regards, Niels Basjes
