We already have an HBase cluster in-house we use together with Hadoop for social analytics. By the way, we ruled it out as our operational experience with it wa

We already have an HBase cluster in-house we use together with Hadoop for social analytics. By the way, we ruled it out as our operational experience with it was a little bit of a pain, in particular around version updates. Talking about DynamoDB, it is certainly attractive as it scales, is managed by Amazon and all the yadda-yadda, but we didn't want to be lock-in to Amazon, and costs were another concern.