Facebook is now using Hadoop for realtime workloads, which is interesting in and of itself. (Cassandra was Facebook’s go-to for NoSQL data.) They’ve also extended Hadoop to make it a more effective realtime system. This white paper and slides detail why they chose Hadoop, what changes they made and what is left to be done.
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Spynner looks like it could be a somewhat suitable replacement for Selenium, without the dependency on a server process. Supports JS, runs on Webkit.