I am writing a little Kafka metrics exporter (Yes there are loads available like prometheus etc but I want a light weight custom one. Kindly excuse me on this). As part of this I would like to know as soon as first message is received (or topic has messages) in a Kafka topic. I am using Spring Boot and Kafka.
Tag: apache-kafka
Disable auto topic creation from Spring Kafka Consumer
I don’t want to auto create topics from my Consumer application when the topics are not present. I know it is a Kafka server level config to disable auto topic creation (auto.create.topics.enable = false), but I cannot do that change in my infrastructure. So I am looking for a way to disable auto topic …
Spring Cloud Stream send/consume message to different partitions with KafkaHeaders.Message_KEY
I set 2 different message keys for 2 partitions . This is my application.yml for producer application To test parallelism, I created a consumer application that reads messages from pf-topic. This is configuration from consumer application. . I created a function in consumer application to consume messages Now…
kafka Offset commit failing org.apache.kafka.clients.consumer.CommitFailedException
I have written a kafka consumer using spring-kafka library (spring-boot-starter-parent 2.3.4.RELEASE). I have following consumer configuration in my code Following is my listener method : Here I am reading 1 message at a time, apply business logic and use ack.acknowledge() to commit offset, but what I have se…
reduce the internal log level for Log4j2 (with Kafka Appender)
I’m using Log4j2 (v2.17.2) to send information directly to kafka, and am using XML to create the configuration (as many articles mention that XML can handle a lot more configuration options – properties do not). The issue that I have is that my console is filled to the brim with irrelevant INFO lo…
Use Kakfa connection to dynamically Subscribe/Unsubscribe the Kafka Topics using Spring Boot
I’m developing a SpringBoot application which exposes the APIs to sub/unsub the Kafka topics. All we need to do is to pass the topic-name in the API call and the application will subscribe to it and consume messages. Subscribe topic API : Unsubscribe topic API : Dependency I have created KafkaConsumerCo…
Spring Integration with Kafka throwing ClassCastException
I have a case where i want to publish message from Kafka Producer, My message is just a POJO object e.g CreateRequest. So for consuming I have added below code Also,I have added setMessageConverter and setPayloadType to get response of type CreateResponse but still i am getting response of type KafkaMessageSo…
Is it better to write integration or unit test for Kafka Spring?
I’ve been searching a while about the best way to test Kafka in Spring. As far as I know, @EmbeddedKafka is more for an unit test but isn’t it better to test Kafka in a real working environment by writing integration test for it? And what really am I testing by writing unit test for Kafka? A real …
How to use Kafka with SSL via logback appander?
I use this logback appender to send logs to Kafka: https://github.com/danielwegener/logback-kafka-appender When Kafka was PLAINTEXT everything worked correctly. But when Kafka changed to SSL, it is not possible to send messages. I did not find the necessary information in readme.md. Has anyone had this setup …
Spring Kafka multiple topic for one class dynamically
I recently wanted to add a new behavior in my project that uses spring-kafka. The idea is really simple : App1 create a new scenario name “SCENARIO_1” and publish this string in the topic “NEW_SCENARIO” App1 publish some message on topic “APP2-SCENARIO_1” and “APP3-SC…