We were discussing the role of Cache Service with Object Storage. The requirements for object storage need not even change while the reads and writes from the applications can be handled. There can be a middle layer as a proxy for a file system to the application while utilizing the object storage for persistence.  This alleviates performance considerations to read and write deep into the private cloud each time. That is how this Cache Layer positions itself. It offers the same performance as query plan caching does to handle the workload and while it may use its own intermediate storage, it works as a staging for the data so that the data has a chance to age and persist in object storage.

The Cache can be used independent of the Object Storage. 

The use of a Cache facilitates server-load-balancing, request routing and batched writes. It can be offloaded to hardware. Caches may utilize Message Queuing. They need not be real web servers and can route traffic to sockets on steroids. They may be augmented globally or in a partitioned server.  

Moreover, not all the requests need to reach the object storage. In some cases, web cache may use temporary storage from hybrid choices. The benefits of using a web cache including saving bandwidth, reducing server load, and improving request-response time. If a dedicated content store is required, typically the caching and server are encapsulated into a content server. This is quite the opposite paradigm of using object storage and replicated objects to directly serve the content from the store. The distinction here is that there are two layers of functions - The first layer is the Cache layer that solves distribution using techniques such as caching, asset copying and load balancers. The second layer is the compute and storage bundling in the form of a server or a store with shifting emphasis on code and storage.  We will call this the storage engine and will get to it shortly.  

The Cache would do the same as an asynchronous write without any change in the application logic.