Vaughn Vernon Uses Reactive DDD to Model Uncertainty in Microservices
Microservices and reactive systems bring with them uncertainty about messages arriving out of order, multiple times, or not at all. How to react to such uncertainty is a business decision, says Vaughn Vernon, and is best captured by modeling the uncertainty using concepts of Domain-Driven Design.
Event Architectures and Event Streaming
When moving from a monolithic system to a distributed or microservices system, you commonly also move from a single source of truth in one database to many databases and thus many sources of truth. Using an event architecture and persisting all events as a stream can give back the single source of truth, Ben Stopford claims in one of a series of blog posts about events, event streams and Kafka.
Selecting an Event Architecture
When designing a distributed system, maybe based on microservices, and you are considering an event architecture, there are several models and technologies available. When choosing how to implement the architecture the non-functional requirements are a main factor, David Dawson claims when describing different styles of event architectures in a recent blog post.
QCon New York 2017: Scaling Event Sourcing for Netflix Downloads
Phillipa Avery, senior software engineer at Netflix, and Robert Reta, senior software engineer at Netflix, presented their Cassandra-backed event sourcing architecture at QCon New York 2017. Currently, it powers the download feature in Netflix, and was summarised as something which improved the flexibility, reliability, scalability and debuggability of their services.
Microsoft Ships Azure Event Grid for Unified Event Processing
Today, Microsoft released a novel service for ingesting and processing cloud events. The Azure Event Grid takes events generated from Azure services, or custom apps, and routes them to chosen handlers.
Amazon CloudWatch Events Gains Cross-Account Event Delivery
Amazon Web Services (AWS) recently added cross-account event delivery to Amazon CloudWatch Events to support use cases such as the tracking of events across an entire organization and the handling of events in separate accounts to implement advanced security schemes.
Process Managers in Event-Based Systems
Publishing events to notify about changes in a domain keeps different domains decoupled from each other, but if there really is a logical flow of events it becomes implicit and hard to follow. A better solution is to use a Process Manager to keep track of the overall process, Bernd Rücker stated in his presentation at this year’s DDD eXchange conference.
Versioning of Events in Event Sourced Systems
A challenge with event sourced systems is that events put in the event store years ago must be readable today, even though the software has gone through numerous changes, Greg Young stated in his presentation at this year’s DDD eXchange conference. If a system can be taken down, versioning of events is relatively simple. The real challenge comes when a system can’t be taken down.
Integrate 2017 Recap: Adding Intelligence to Integration
Integrate 2017, an annual integration event focused on Microsoft Integration technologies, took place in London from June 26th – 28th. Some of the key themes that were discussed include the role of cognitive computing in integration, API orchestration, SaaS connectivity, cloud native integration, the impact of serverless on integration and cloud messaging at scale.
Dynamically Reconfigurable Event Driven Systems at QCon NY
Danny Gooverts, CTO at The Glue, presented at QCon New York a solution architecture enabling banks to evolve and follow market trends and needs. The solution combines events based service modeling, in memory data processing grid and Docker based deployments to achieve scalability and exactly once processing.
Managing Data in Microservices
Randy Shoup from Stitch Fix team spoke at QCon New York 2017 Conference about managing the data and isolated persistence in Microservices based applications. He also talked about events as a first class construct for microservices.
Dani Traphagen on Next Phase of Distributed Systems with Apache Ignite
Dani Traphagen from GridGain spoke at OSCON 2017 Conference about Apache Ignite platform. She talked about the paradigm shift in viewing the disk as a bottleneck, the decreasing costs of memory and how to optimize toward the cache, leveraging it for microservices architectures with the open source project Apache Ignite.
John Gossman on Microsoft’s Serverless Platform, Azure Functions and Logic Apps
John Gossman, lead architect at Microsoft Azure, spoke on Thursday at ServerlessConf Conference about Microsoft's open source Serverless platform. The Microsoft team also gave demos on Azure Functions, Logic Apps and how to monitor the platform components.
Overview of the Reliable Event Delivery System at Spotify
Spotify clients generate up to 1.5 million events per second at peak hours and all are handled by their Event Delivery System, designed to have a predictable latency and to never lose an event, Igor Maravic noted in his presentation at the recent QCon London conference, where he gave a high level overview of the system and some of the key operational aspects.
Concurrent and Distributed Programming in the Future
The world is concurrent with everything around us asynchronous and event oriented. Concurrency and the cloud are things every developer will have to deal with in the future, Joe Duffy claimed in his keynote at the recent QCon London conference. At the heart of this is communication, which is essential both for concurrent and distributed systems.
