NiFi FlowFile gRPC Server

Simple server to receive FlowFiles sent from a NiFi processor

Reference: https://issues.apache.org/jira/browse/NIFI-4037

Instructions

1. Clone this repo.

2. Build a NiFi flow of GenerateFlowFile and InvokeGRPC as described in the ticket above, but wait to enable the flow.

3. Configure the InvokeGRPC as follows:

   • remote host: localhost

   • remote port: Ensure that the port is the same as set here: https://github.com/m-hogue/nifi-grpc-server/blob/master/src/main/java/org/mikeyo/NifiFlowFileServer.java#L18

4. Configure the GenerateFlowFile processor to generate an abitrarily sized file at an arbitrary interval. I chose 30B @ every 5 seconds.

5. Run the gRPC server main method in your IDE: https://github.com/m-hogue/nifi-grpc-server/blob/master/src/main/java/org/mikeyo/NifiFlowFileServer.java or run 'mvn exec:java'

6. Enable both the GenerateFlowFile and InvokeGRPC processors. You should see the server log a message roughly every 5 seconds once the generated flow file has made it through the flow.