We started with Kafka's built-in command-line tools, as well as the Consumer API and other popular 3rd party tools like Confluent Control Center and CMAK. In this article, we looked at a few ways to get the number of messages in a Kafka topic. This field displays the total number of messages in the topic. In CMAK, look for the "Total Size" field in the "Topic Identity" section on the topic's detail page.This field should show the total number of messages in the topic. In Confluent Control Center, check the "Messages" field in the "Overview" tab.Locate your topic and click on it.Īfter navigating to the topic, you can retrieve the message count: In CMAK, choose the cluster and then click on the "Topic List" link.In Confluent Control Center, go to the "Topics" tab and select the desired topic.Once connected to your cluster, you can navigate to the topic whose message count you want to retrieve. Next, import the necessary libraries in your Python script: from kafka import KafkaConsumer You can do this using pip: $ pip install kafka-python You can adapt this method for other languages, such as Java, as needed.įirst, you'll need to install the kafka-python library if you haven't already. In this section, we'll show how to use the Consumer API in Python to count the messages in a topic. The Consumer API is a programming interface that allows you to get messages from topics in various programming languages. Using the Kafka Consumer APIĪnother approach to getting the number of messages in a Kafka topic is by using the Kafka Consumer API. Keep in mind that this method shows the count of messages currently available in the topic, and any messages that have been removed due to retention policies, for example, will not be included. To get the total message count, you need to add up the values for each partition. The -time -1 parameter tells the tool to fetch the latest offsets for each partition in the topic.Īfter executing the command, you'll see output formatted like this: ::įor example, it might look like this: my_topic:0:450 Replace with the list of your brokers, and with the name of the topic you want to fetch the message count for. bin/kafka-run-class.sh -broker-list -topic -time -1 To get the number of messages, you can use the kafka-run-class.sh script along with the class. Here we'll focus on using these built-in command-line tools to get the number of messages in a topic. These tools are very convenient when it comes to retrieving information about your cluster, like message counts. Kafka comes bundled with a set of useful command-line tools that can be used for a number of different tasks, like creating topics, and managing and monitoring your cluster. In this article, we'll discuss various methods to help you get the number of messages in a Kafka topic with ease. Of course, each method has its pros and cons, which we'll also briefly take a look at. Some of these methods include using Kafka's built-in command-line tools, leveraging the Consumer API, or using third-party tools. There are a number of ways to get the message count for a topic, and we'll do our best to cover the most popular ways. By keeping an eye on the message count, you can ensure your system is operating smoothly and detect potential issues. One key aspect of ensuring a well-managed and maintained a Kafka cluster is monitoring the number of messages in a topic.
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