Microservices

Log tracing with Sleuth and Zipkin

In a microservice environment it's hard to trace errors and logs, as we have lots of moving components. We could go into each service and read the logs, then aggregate them and finally with lots of patience try to understand what is happening. But we should not do this, we have alternatives. One of them… Continue reading Log tracing with Sleuth and Zipkin

Microservices

Zuul – Edge Server

In the last articles we have introduced an custom gateway in order to hide services and to load balance requests among others. Now the guys at netflix implemented this pattern and created Zuul. Personally, it reminds me of Apache Server. Zuul core consists of filters, which you can use to intercept the request and response… Continue reading Zuul – Edge Server

Microservices

Hystrix

Microservices should respect the CAP theorem. That means when a failure occurs, you should choose between consistency and availability, and availability is the best choice. Hystrix has the role to keep the availability high when a partition occurs, by stopping cascading failures and providing fallback. These partitions should not be visible to the end user,… Continue reading Hystrix

Microservices

Eureka and Feign

Eureka Eureka is a REST (Representational State Transfer) based service used for locating services for the purpose of load balancing and failover of middle-tier servers. We have eureka client and server. The server holds the information regarding the service instances, while the client interacts with the server and act as a round robin load balancer.… Continue reading Eureka and Feign

Microservices

Debezium – Transaction log miner

In the previous post the services used eventuate to communicate. But how did it know to create events? How does the CDC module work? Well behind the scenes it is mining the transaction logs and create events from it. Enter¬†Debezium. It's build on top of Kafka and records the changes made to the database in… Continue reading Debezium – Transaction log miner

Microservices

Eventuate

Eventuate is a framework that makes event-driven microservices easy. It simplifies a lot our work, as it has change data capture(CDC), message broker(Kafka) and a event store (Eventuate). For more information regarding eventuate you can start with this.¬† Now let's apply this on our known use case(items and bids). First of all, a picture will… Continue reading Eventuate