[jira] [Created] (FLINK-21865) Add a Docker Compose greeter example to StateFun playgrounds

["Tzu-Li (Gordon) Tai (Jira)" <ji...@apache.org>]

Tzu-Li (Gordon) Tai created FLINK-21865:
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             Summary: Add a Docker Compose greeter example to StateFun playgrounds
                 Key: FLINK-21865
                 URL: https://issues.apache.org/jira/browse/FLINK-21865
             Project: Flink
          Issue Type: Task
          Components: Stateful Functions
            Reporter: Tzu-Li (Gordon) Tai
            Assignee: Tzu-Li (Gordon) Tai
             Fix For: statefun-3.0.0


This example is intended as a follow-up after completion of the Java SDK Showcase Tutorial (FLINK-21862).

If users are already familiar with the Java SDK fundamentals and would like to get a better understanding of how a realistic StateFun application looks like, then this would be the example they start with. Otherwise, we would recommend users to take a look at the Showcase tutorial first.

This example works with Docker Compose, and runs a few services that build up an end-to-end StateFun application:
- Functions service that runs functions and expose them through an HTTP endpoint.
- StateFun runtime processes (a manager plus workers) that will handle ingress, egress, and inter-function messages as well as function state storage in a consistent and fault-tolerant manner.
- Apache Kafka broker for the application ingress and egress.

To motivate this example, we'll implement a simple user greeter application, which has two functions - a {{UserFn}} that expects {{UserLogin}} JSON events from an ingress and keeps in state storage information about users, and a {{GreetingsFn}} that accepts user information to generate personalized greeting messages that are sent to users via an egress.



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