> they're not at the scale of FB (where "traditional" solutions break down)
I'm not so sure about that. Bloomberg processes an incredible amount of data, and they have strict latency requirements. In many cases, traditional solutions would in fact break down under those requirements.
I work on the infrastructure team at Bloomberg. There are lots of problems solved by OSS, but there are also lots of pieces of infrastructure we have to build ourselves to scale the things we need to. Latency is killer, indeed. (Low-latency data aggregation/generation/distribution is only one part of the business, though.)
I'm not so sure about that. Bloomberg processes an incredible amount of data, and they have strict latency requirements. In many cases, traditional solutions would in fact break down under those requirements.