Have you considered the simplest way to write and read messages from Kafka? If not, in this article you will discover how you can use Kafka Console Producer. You can use the Kafka Console Producer to write records to a Kafka Topic straight from the command line. When you aren’t generating data to the Topics, producing messages from the command line is a terrific method to quickly test new user applications.
So what are you waiting for? Read along to know more about how Kafka Console Producer works. You will also learn key features offered by it and understand some easy steps to get started with it. At the end of this article, you will explore the best strategies you should know while working with Kafka Console Producers and Consumers.
Table of Contents
What is Apache Kafka?
Apache Kafka is a Distributed Event Streaming solution that enables applications to efficiently manage billions of events. The Java and Scala-based framework supports a Publish-Subscribe Messaging system that accepts Data Streams from several sources and allows real-time analysis of Big Data streams. It can quickly scale up with minimal downtime.
Kafka’s global appeal has grown as a result of its low data redundancy and high fault tolerance. More than 60% of the Fortune 100 organizations use Kafka. Kafka was created by LinkedIn, which utilizes it to monitor activity data and operational analytics. It’s used by Twitter as part of Storm’s stream processing architecture. Moreover, Square employs Kafka as a bus to transport all system events to multiple Square data centers as well as outputs to Splunk and Graphite. Uber, Goldman Sachs, NetFlix, PayPal, Box, Spotify, Cisco, and a plethora of other organizations use Kafka.
Key Features of Apache Kafka
Kafka is a trusted platform for enabling and developing businesses. Let’s have a look at some of the powerful features which makes Kafka so popular:
- High Scalability: Kafka’s partitioned log model distributes data over several servers, allowing it to extend beyond the capabilities of a single server. Kafka has low latency and great throughput since it separates data streams.
- Fault-Tolerant & Durable: By distributing partitions and replicating data over several servers, Kafka protects data from server failure and makes it fault-tolerant. It can restart the server by itself.
- Robust Integrations: Kafka supports various third-party connectors. It also offers many APIs. Hence, you can add more features in a matter of seconds. Take a look at how you can use Kafka with Elasticsearch, Cassandra, and Snowflake.
- Comprehensive Analysis: For tracking operational data, Kafka is a popular solution. It enables you to collect data from several platforms in real-time and organize it into consolidated feeds while keeping a check with metrics. Refer to the Real-time Reporting with Kafka Analytics article for further information on how to analyze your data in Kafka.
Want to explore more about Apache Kafka? You can visit the Kafka website or refer to Kafka documentation.
What is Kafka Console Producer?
A Kafka Console Producer (kafka-console-producer) is one of the utilities that comes with Kafka packages. It is used to write data to a Kafka Topic using standard input or the command line. When you type anything into the console, kafka-console-producer writes it to the cluster. Topics are made up of Partitions where the data is written by the Producers. You can run the Kafka Console Producer, by using the following command:
Kafka supports 2 types of Producers, these are:
- Sync Producers: These send messages directly in the background.
- Async Producers: Messages are sent when the amount of messages with a greater throughput is achieved.
Key Features of Kafka Console Producer
The idempotency of the Kafka Console Producer improves delivery semantics from at least once to exactly-once delivery. It also employs a transactional mode, which lets a program send messages to various Partitions, including a Kafka Topic. Let’s explore other powerful features of Kafka Console Producer:
- Thread-Safe: Each Kafka Console Producer has a buffer space pool where records that haven’t yet been transferred to the server are stored. The I/O thread is used to deliver these records to the cluster as a request.
- Durable: The acknowledgments (acks) are in charge of defining the conditions by which the request is regarded as complete. Kafka Console Producers offers 3 types of acknowledgments (acks) that have been discussed further in the article.
- Scalable: For each Kafka Partition, the Producer keeps a buffer of unsent records. These buffers are supplied in accordance with the batch size, which can manage a high number of messages at once. To read more about partitions, refer to Kafka Partitions Guide.
- Fault-Tolerant: When a node fails, the producer has an important feature that allows it to offer resistance to the node and instantly recover it.
Read along to know how you can leverage Kafka Console Producer to send messages to Kafka Console Consumer.
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Easy Steps to Get Started with Kafka Console Producer Platform
So are you eager to get started with Kafka and want to rapidly create and consume some simple messages? In this section, you will learn how to send and receive messages from the command line. Follow the steps below to work with Kafka Console Producer and produce messages:
Step 1: Set Up your Project
First, create a new directory at your desired location using the following command:
mkdir console-consumer-producer-basic && cd console-consumer-producer-basic
Now, you need to set a docker-compose.yml file to get the Confluent platform. You can simply copy-paste the below script in the docker-compose.yml:
Next, launch your Confluent platform using the following command:
docker-compose up -d
Step 2: Create the Kafka Topic
After starting the Kafka and Zookeeper services on the Confluent platform, let’s create a Kafka Topic. Enter the following command:
docker-compose exec broker kafka-topics --create --topic orders --bootstrap-server broker:9092
Step 3: Start a Kafka Console Consumer
Now, you need to set up the consumer to read the received records sent to the topic created above. So, continue in the same terminal and enter the following command to open a terminal on the broker container:
docker-compose exec broker bash
Now, enter the following command, within this new terminal to start the Kafka Console Consumer:
Step 4: Produce your Records using Kafka Console Producer
Now that your Kafka Console Consumer is running, let’s publish some records using the Kafka Console Producer. So, open a new terminal and enter the following command to open another shell on the broker container:
docker-compose exec broker bash
In the new terminal that opens, enter the following command to run your Kafka Console Producer:
Wait for a few seconds, your Kafka Console Producer will run smoothly. Then enter some strings which are considered as Records as shown below:
Send all the records and check the consumer window. You will see the same output. Once you have received all the records from Kafka Console Producer, you can press Ctrl+C keys to stop your consumer.
Step 5: Send New Records from Kafka Console Producer
You can observe that as the Kafka Consumer was already running you received the incoming records easily. However, what is there were some records published before Kafka Consumer started. To publish all those records as well you can use the –from-beginning command.
So, go back to your Kafka Console Producer and send a few records as shown below:
you are learning
using Kafka Console Producer
Step 6: Start a New Consumer
After sending these records, start your Kafka Consumer again and enter the following command:
Wait for a few seconds for Kafka Consumer to start. The following output will be displayed:
you are learning
using Kafka Console Producer
Once you have received all the records, you can close this consumer terminal using the Ctrl+C keys.
Step 7: Produce Records with Key-Value Pairs
If you have been working with Kafka, you might know that Kafka works with Key-Value pairs. In the previous steps, you have just sent the records having the values. Hence for all these records, the keys will be null. Let’s see how you can enter some valid keys. Before you begin, make sure you close the previous running Kafka Console Producer using Ctrl+C keys.
Now, start a new Kafka Console Producer using the following command:
After the Kafka Console Producer starts, enter the following Key-Value pairs:
Step 8: Start a Consumer to display Key-Value Pairs
After sending the above records, start a new Kafka Console Consumer using the following command:
Wait for a few seconds, your Consumer will start and display the following output:
null:you are learning
null:using Kafka Console Producer
You can observe that the records that were entered without keys have their keys set to null. You also observe that all the records from the beginning are being displayed. This was achieved using the –from-beginning command.
Great Work! You have gained a basic understanding of how you can use Kafka Console Producer and Consumer to your advantage. To close the docker, you can use the docker-compose down command.
Create a Kafka Console Consumer
Using the console interface of Kafka, in this section of the blog, we shall learn in detail about how to create Kafka Consumer using the console interface. To create Kafka Producer and Consumer, it’s necessary to use “bin/kafka-console-producer.sh” and “bin/kafka-console-consumer.sh,” present in the Kafka Directory. Follow the steps to learn how:
Step 1: Let’s Start With Starting Up Zookeeper and Kafka Cluster.
First, navigate through the root of the Kafka Directory and run the following command, each of them in separate terminals to kick-start Zookeeper and Kafka Cluster respectively.
$ bin/zookeeper-server-start.sh config/zookeeper.properties
$ bin/kafka-server-start.sh config/server.properties
Step 2: Now Create a Kafka Topic.
Run the below-given command to create a topic named “sampleTopic.”
$ bin/kafka-topics.sh --create --zookeeper localhost:2181 --replication-factor 1 --partitions 1 --topic sampleTopic
Step 3: Next, It’s Time To Create Kafka Console Producer.
Run the below-given command. The command will signal to kick-start Kafka Producer, writing to sampleTopic
$ bin/kafka-console-producer.sh --broker-list localhost:9092 --topic sampleTopic
Step 4: Create a Kafka Console Consumer.
Run the below-given command. The command will signal to kick-start Kafka Producer, subscribed to sampleTopic.
$ bin/kafka-console-consumer.sh --bootstrap-server localhost:9092 --topic sampleTopic --from-beginning
Step 5: At Last, Send Messages.
Now, you can start sending messages from the producers. As soon as you start sending out the messages, the consumer shall start getting messages via Kafka Topic.
Top Strategies Kafka Developers must know when Processing Data on the Kafka Console Producer Platform
Many Fortune 500 firms use Apache Kafka as an Event Streaming platform. Kafka has many features that make it the de-facto standard for Event Streaming platforms. In this part, you’ll learn about some of the most important strategies to keep in mind when dealing with Kafka Console Producer.
1) Understand Message Delivery, Acknowledgment & Durability
The Kafka Producer has the acks configuration parameter for data durability. The acks parameter determines how many acknowledgments the producer must get before a record is considered delivered to the broker. The following are the possibilities offered:
- none: When the producer transmits the records to the broker, it deems them effectively delivered. This can be represented as a “fire and forget” strategy.
- one: The producer waits for the lead broker to confirm that the record has been written to its log.
- all: The producer waits for acknowledgment from the lead broker and subsequent brokers that the record has been successfully written to their logs.
The lead broker will not try to add the record to its log if the number of replicas in sync is less than the predefined amount. The producer is forced to retry the write because the leader raises a NotEnoughReplicasException or a NotEnoughReplicasAfterAppendException. Since having replicas out of sync with the leader is not good, the producer will continue to retry and send the records until the delivery timeout is reached. You can extend the durability of your data by configuring min.insync.replicas and producer acks to operate together in this fashion.
2) Explore the Sticky Partitioner in the Producer API
The Kafka Producer and Consumer APIs have introduced several new functionalities in the last years that every Kafka developer should be aware of. Instead of employing a round-robin technique per record, the Sticky Partitioner allocates records to the same partition until the batch is despatched. The Sticky Partitioner then increments the partition to use for the following batch after delivering a batch.
You will submit fewer produce requests if you use the same partition until a batch is full or otherwise completed. This helps to decrease the load on the request queue and reduces system latency. It’s worth noting that the Sticky Partitioner still ensures that records are distributed evenly. As the Partitioner distributes a batch to each partition, the even distribution happens over time. It’s similar to a “per-batch” round-robin or “eventually even” strategy.
3) Master the Command Line Tools
The bin directory in the Apache Kafka binary installation contains various utilities. Apart from the Kafka Console Producer covered in this article, you should be familiar with console-consumer, dump-log, and other commands in that directory.
- Kafka Console Consumer: You can consume records from a Kafka Topic straight from the command line using the Kafka Console Consumer. When developing or debugging, being able to immediately start a consumer can be quite useful. Simply execute the following command to verify that your producer application is delivering messages to Kafka Console Consumer:
- Dump Log: When working with Kafka, you may need to manually analyze the underlying logs of a Topic from time to time. The kafka-dump-log command is your buddy whether you’re merely interested in Kafka internals or you need to troubleshoot a problem and validate the content. Here’s a command for viewing the log of an example Topic:
Kafka provides various other features and capabilities for its Kafka Console Producer and Consumer. To explore other strategies read the Top Things Every Apache Kafka Developer Should Know when Processing Data on the Kafka Console Producer and other Kafka Platforms.
This article helped you understand Kafka Console Producer. You started by learning about Apache Kafka and its features. You also understood the key features of Kafka Console Producer and how you can leverage it to send messages easily with just a few lines of commands. At the end of this article, you discovered some good strategies and capabilities that Kafka offers to its Developers for Kafka Console Producer and Consumer.
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