We were discussing the use case of stream storage with message broker. We continue the discussion today.

A message broker can roll over all data eventually to persistence, so the choice of storage does not hamper the core functionality of the message broker.

A stream storage can be hosted on any Tier2 storage whether it is files or blobs. The choice of tier 2 storage does not hamper the functionality of the stream store. In fact, the append only unbounded data nature of messages in the queue is exactly what makes the stream store more appealing to these message brokers

The message broker is more than a publisher subscriber. It is the potential for a platform for meaningful insight into events.  

Message broker is also a networking layer that enables a P2P network of different local storage which could be on-premise or in the cloud. A distributed hash table in this case determines the store to go to. The location information for the data objects is deterministic as the peers are chosen with identifiers corresponding to the data object's unique key. Content therefore goes to specified locations that makes subsequent requests easier. Unstructured P2P is composed of peers joining based on some rules and usually without any knowledge of the topology. In this case the query is broadcast and peers that have matching content return the data to the originating peer. This is useful for highly replicated items. P2P provides a good base for large scale data sharing. Some of the desirable features of P2P networks include selection of peers, redundant storage, efficient location, hierarchical namespaces, authentication as well as anonymity of users.  In terms of performance, the P2P has desirable properties such as efficient routing, self-organizing, massively scalable and robust in deployments, fault tolerance, load balancing and explicit notions of locality.  Perhaps the biggest takeaway is that the P2P is an overlay network with no restriction on size and there are two classes structured and unstructured. Structured P2P means that the network topology is tightly controlled and the content is placed on random peers and at specified location which will make subsequent requests more efficient.