My somewhat embarassed apologies. I have confused RocksDB with CockroachDB. My understanding is that, at the time of development, Rocks itself did not support

My somewhat embarassed apologies. I have confused RocksDB with CockroachDB. My understanding is that, at the time of development, Rocks itself did not support multiple writers. This was in 2015, or maybe 2014. At this point it looks like TransactionsDB might cover that, but I was not super familiar with that particular project, nor am I super familiar with RocksDB in general. I do know that they asserted Rocks could not handle multiple writers the way they wanted, and they needed something which handled SSTs well. Rocks was chosen and the shim layer was written on that assumption.