confluentgist

-- Create ksqlDB table from Kafka topic.
CREATE TABLE myTable (username VARCHAR, location VARCHAR)
  WITH (KAFKA_TOPIC='input-topic', KEY='username', VALUE_FORMAT='...');

confluentgist

// Create KStream from Kafka topic.
StreamsBuilder builder = new StreamsBuilder();
KStream<String, String> stream =
  builder.stream("input-topic", Consumed.with(Serdes.String(), Serdes.String()));

confluentgist

-- Create ksqlDB stream from Kafka topic.
CREATE STREAM myStream (username VARCHAR, location VARCHAR)
  WITH (KAFKA_TOPIC='input-topic', VALUE_FORMAT='...');

confluentgist

“task”: {
  “type”: “.TaskRole,
  “initialDelayMs”: 20000,
  “taskSpecs”: {
    "bench0": {
      "class": "org.apache.kafka.trogdor.workload.ProduceBenchSpec",
      "startMs": 0,
      "durationMs": 720000,
      "producerNode": "node0",
      "bootstrapServers": "%{bootstrapServers}",

confluentgist

// +build testrunmain

package main

import (
	"testing"

	"github.com/confluentinc/bincover"
)

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final KafkaStreams streams = new TestKafkaStreams(builder.build(), streamsConfiguration);
streams.cleanUp();
streams.start();

confluentgist

final KStream<String, String> inputEvents = builder.stream(inputTopic);

inputEvents.foreach((key, value) -> {

// Transform input values (list of Strings) to expected DL4J parameters (two Integer values):
String[] valuesAsArray = value.split(",");
INDArray input = Nd4j.create(Integer.parseInt(valuesAsArray[0]), Integer.parseInt(valuesAsArray[1]));

// Model inference in real time:
output = model.output(input);

confluentgist

// Configure Kafka Streams Application
Properties streamsConfiguration = new Properties();

streamsConfiguration.put(StreamsConfig.APPLICATION_ID_CONFIG, "kafka-streams-tensorflow-keras-integration-test");
streamsConfiguration.put(StreamsConfig.BOOTSTRAP_SERVERS_CONFIG, CLUSTER.bootstrapServers());

// Specify default (de)serializers for record keys and for record values
streamsConfiguration.put(StreamsConfig.DEFAULT_KEY_SERDE_CLASS_CONFIG, Serdes.String().getClass().getName());
streamsConfiguration.put(StreamsConfig.DEFAULT_VALUE_SERDE_CLASS_CONFIG, Serdes.String().getClass().getName());

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// Step 1: Load Keras TensorFlow Model using DeepLearning4J API
String simpleMlp = new ClassPathResource("generatedModels/Keras/simple_mlp.h5").getFile().getPath();
System.out.println(simpleMlp.toString());
MultiLayerNetwork model = KerasModelImport.importKerasSequentialModelAndWeights(simpleMlp);

confluentgist

import org.apache.kafka.streams.KafkaStreams;
import org.apache.kafka.streams.KeyValue;
import org.apache.kafka.streams.StreamsBuilder;
import org.apache.kafka.streams.StreamsConfig;
import org.apache.kafka.streams.integration.utils.EmbeddedKafkaCluster;
import org.apache.kafka.streams.integration.utils.IntegrationTestUtils;
import org.apache.kafka.streams.kstream.KStream;
import org.deeplearning4j.nn.modelimport.keras.KerasModelImport;
import org.deeplearning4j.nn.multilayer.MultiLayerNetwork;