dce6d5a838
Summary: The background thread pools' sizes weren't easily configurable by `max_background_compactions` and `max_background_flushes` in multi-instance setups. Introduced separate arguments for their sizes. Closes https://github.com/facebook/rocksdb/pull/2680 Differential Revision: D5550675 Pulled By: ajkr fbshipit-source-id: bab5f0a7bc5db63bb084d0c10facbe437096367d