Ambrose - Monitoring of MapReduce data

Twitter announced it's project "Ambrose" is available as open source.

It's a platform for visualization and real-time monitoring of MapReduce data workflows. It presents a global view of all the map-reduce jobs derived from your workflow after planning and optimization. As jobs are submitted for execution on your Hadoop cluster, Ambrose updates its visualization to reflect the latest job status, polled from your process.

Repository for source code/contribute.