How to check if Kafka is running

There are several ways to check if Kafka is running.

1. To check Kafka’s log files: The startup log of Kafka is usually output to the console or a specified log file. You can see if it contains logs with “KafkaServer”, indicating that Kafka has successfully started.
2. By using the command-line tools provided by Kafka, such as kafka-topics.sh and kafka-console-consumer.sh, you can try executing a command to check if Kafka is running properly based on whether it outputs results.
3. To check the Kafka process using the JPS command: Running the “jps” command in the command line allows you to view the process ID of all Java processes currently in the system. If a process named “Kafka” or containing the keyword “Kafka” is found, it means that Kafka has been started.
4. By using the Zookeeper client tool, Kafka relies on Zookeeper for coordination and management. You can connect to a Zookeeper cluster using Zookeeper’s client tool and check if the Kafka-related nodes exist. If the Kafka-related nodes exist, it means that Kafka has already been started.
5. Test the connection using Kafka’s Java API: Write a simple Java program to attempt to connect to a Kafka cluster using Kafka’s Java API. If the connection is successful and you are able to perform operations like sending and receiving messages, it means that Kafka is up and running.

In conclusion, you can determine whether Kafka has successfully started by checking Kafka’s logs, using Kafka’s command line tools, using the JPS command, using Zookeeper’s client tools, or conducting a connection test with Kafka’s Java API.