Lab
A Cloud Guru

Streaming Data Using Kafka Streams to Count Words

Kafka Streams is a library enabling you to perform per-event processing of records. You can use it to process data as soon as it arrives, versus having to wait for a batch to occur. In this hands-on lab, we use Kafka Streams to stream some input data as plain-text and process it in real-time. With this, we can count the number of words from our input stream.

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Path Info

Level

Intermediate

Duration

1h 0m

Published

Jul 17, 2019

Challenge

Create the Input and Output Topic

Create the input topic named streams-plaintext-input.

bin/kafka-topics.sh --create --zookeeper localhost:2181 --replication-factor 1 --partitions 1 --topic streams-plaintext-input

Create the output topic named streams-wordcount-output.

bin/kafka-topics.sh --create --zookeeper localhost:2181 --replication-factor 1 --partitions 1 --topic streams-wordcount-output

Challenge

Open a Kafka Console Producer

Open a Kafka console producer.

bin/kafka-console-producer.sh --broker-list localhost:9092 --topic streams-plaintext-input

Type the three messages from the instructions.

>kafka streams is great
>kafka processes messages in real time
>kafka helps real information streams

Challenge

Open a Kafka Console Consumer

Open a Kafka console consumer using the default message formatter and the three properties given in the instructions.

bin/kafka-console-consumer.sh --bootstrap-server localhost:9092 
--topic streams-wordcount-output 
--from-beginning 
--formatter kafka.tools.DefaultMessageFormatter 
--property print.key=true 
--property print.value=true 
--property key.deserializer=org.apache.kafka.common.serialization.StringDeserializer 
--property value.deserializer=org.apache.kafka.common.serialization.LongDeserializer

Challenge

Run the Kafka Streams Application
Use the kafka-run-class.sh command to run the WordCountDemo application.
```
bin/kafka-run-class.sh org.apache.kafka.streams.examples.wordcount.WordCountDemo
```

Author

A Cloud Guru

The Cloud Content team comprises subject matter experts hyper focused on services offered by the leading cloud vendors (AWS, GCP, and Azure), as well as cloud-related technologies such as Linux and DevOps. The team is thrilled to share their knowledge to help you build modern tech solutions from the ground up, secure and optimize your environments, and so much more!

What's a lab?

Hands-on Labs are real environments created by industry experts to help you learn. These environments help you gain knowledge and experience, practice without compromising your system, test without risk, destroy without fear, and let you learn from your mistakes. Hands-on Labs: practice your skills before delivering in the real world.