Event Sourced Systems is an Anti-Pattern: "The single biggest bad thing that Young has seen during the last ten years is the common anti-pattern of building a whole system based on Event sourcing. That is a really big failure, effectively creating an event sourced monolith. CQRS and Event sourcing are not top-level architectures and normally they should be applied selectively just in few places.
The last problem Young mentions is the lack of Process managers. Building a system with many services each directly subscribing to events from other services can make it very hard to understand what the system actually does. Finding the overall process can be quite difficult without going through the code in each service. Young notes that Process managers are difficult but believes that the best explanation is found in the Enterprise Integration Patterns book.
Looking into the future Young believes we will see more functional programming along with event sourcing. He notes that even though event sourcing often is tied into object orientation it’s a purely functional model making it fit very well with functional code and he thinks we will see an increasing amount of functional code on top of event sourced systems."
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