How to use MemoryStorageClient with redis for Request Queue?

Currently, as per source code, RequestQueue uses MemoryStorageClient by default. However, MemoryStorageClient uses file-based storage rather than in-memory storage. I am planning to use Redis as a storage backend for higher throughput. 

Can anyone help me with an example of how to configure RequestQueue or MemoryStorageClient to use Redis as storage backend?
