How Synchronous REST Turns Microservices Back into Monoliths - The New Stack: "If you are breaking down a monolithic legacy application into a set of microservices, and if those microservices are communicating via REST (Representational State Transfer), then you still have, in effect, a monolithic application, asserted Lightbend tech lead, James Roper.
Roper laid down this heavy wisdom at the monthly New York Java Special Interest Group meeting on Wednesday, at the Viacom headquarters in Manhattan.
In the talk, Roper was a big advocate of asynchronous communication. Not surprisingly, Lightbend (formerly Typesafe) offers a Scala-based microservices platform, called Lagom, based on asynchronous communications.
Keep in mind, “asynchronous communications” is different from the commonly used term “asynchronous I/O.” Asynchronous I/O is all about not halting an operation to wait for a process thread to complete, while asynchronous communication, an artifact of microservices, is about designing a system such that one service doesn’t need to wait on another to complete its task.
“Using async communication, if a user makes a request to a service, and that service needs to make a request to another service, that communication is not going to block [the first service] service from returning a response to the user,” Roper said."
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