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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
You can watch the action happen in realtime on the GitLab repo.
Colocated makes a lot of sense as well, because real workloads will almost certainly be as close as they can get to storage. There's even stork which tries to help the scheduler make it so (though you can do it other simpler ways).
Agreed, can't beat not leaving your machine :). I'll make a note to get some Object gateway tests in -- what did you use for your s3 benchmarking? Did you just script it or use a tool like warp? I'd like to get as close to replicating your set up so I can compare numbers.