clojure-kafka-graavm-native-image

It turns out that it is possible to compile Kafka Producer and Consumer with GraalVM native-image and the demo is all in Clojure.

TL;DR

make build-clj-kafka && ./clj-kafka

Demo

It will start a background thread with a Kafka Producer that every second sends a message to the Kafka. And in the main thread it'll launch a Kafka Consumer that polls for messages from the same topic as is used by the producer. Process doesn't stop.

Cool thing is that the binary starts instantly and use ~28 mb of RAM.

./clj-kafka   0.01s  user 0.02s system 0% cpu 4.168 total
avg shared (code):         0 KB
avg unshared (data/stack): 0 KB
total (sum):               0 KB
max memory:                28 MB
page faults from disk:     0
other page faults:         1488

Params

Environment variables are used:

• BOOTSTRAP_SERVERS_CONFIG: Kafka brokers, default value "127.0.0.1:9092"
• TOPIC: kafka topic name, default value "test"

Optional

Start Kafka cluster in docker-compose in another terminal:

make run-dev-env

Requirements

Linux, Docker, docker-compose, clojure.

For MacOS download GraalVM, install native-image, set JAVA_HOME, add native-image to PATH and run:

clojure -A:native-image

Or in one step:

(JAVA_HOME=/home/user/graalvm-ce-java11-20.0.0/ && PATH=/home/user/graalvm-ce-java11-20.0.0/bin:$PATH && clojure -A:native-image)

License

Copyright © 2020 Dainius Jocas.

Distributed under the The Apache License, Version 2.0.