I'm trying to find examples of kafka connect with springboot. It looks like there is no spring boot integration for kafka connect. Can some one point me in the right direction to be able to listen to changes on mysql db?
Kafka Connect doesn't really need Spring Boot because there is nothing for you to code for it, and it really works best when ran in distributed mode, as a cluster, not embedded within other (single-instance) applications. I suppose if you did want to do it, then you could copy relevent portions of the source code, but that of course isn't using Spring Boot, and you'd have to wire it all yourself
The framework itself consists of a few core Java dependencies that have already been written (Debezium or Confluent JDBC Connector, for your mysql example), and two config files. One for Kafka Connect to know the bootstrap servers, serializers, etc. and another for the actual MySQL connector. So, if you want to use Kafka Connect, run it by itself, then just write the consumer in the Spring app.
The alternatives to Kafka Connect itself would be to use Apache Camel within a Spring application (Spring Integration) or Spring Cloud Dataflow and interfacing with those Kafka "components" (which aren't using the Connect API, AFAIK)
Another option, specific for listening to MySQL, is to use Debezium Engine within your code.
Related
I'm thinking of developing a simulation of RabbitMQ that can be used in unit tests where it is not possible to start up an entire RabbitMQ server or not possible to connect to one. This RabbitMQ simulation would obviously have the same API as the RabbitMQ Java client. Question is now how to plug in this API of the RabbitMQ simulation into Spring Boot instead of the original one from RabbitMQ. Is there some hook in Spring Boot so that this could be done?
It's quite difficult to simulate RabbitMQ.
Some people have has some success using an embedded Apache QPID server running amqp 0.9.1.
However, it doesn't support any RabbitMQ extensions, if you are using those.
You'd be better off using something like TestContainers.
https://www.testcontainers.org/modules/rabbitmq/
I am trying to export data from Kafka to Oracle db. I've searched related questions and web but could not understand that we need a platform (confluent etc.. ) or not. I'd been read the link below but it's not clear enough.
https://docs.confluent.io/3.2.2/connect/connect-jdbc/docs/sink_connector.html
So, what we actually need to export data without 3rd party platform? Thanks in advance.
It's not clear what you mean by "third-party" here
What you linked to is Kafka Connect, which is Apache 2.0 Licensed and open source.
Kafka Connect is a plugin ecosystem, you install connectors individually, written by anyone, or write your own, just like any other Java dependency (i.e. a third-party)
The JDBC connector just happens to be maintained by Confluent. and you can configure the Confluent Hub CLI
to install within any Kafka Connect distribution (or use Kafka Connect Docker images from Confluent)
Alternatively, you use Apache Spark, Flink, Nifi, and many other Kafka Consumer libraries to read data and then start an Oracle transaction per record batch
Or you can explore non-JVM kafka libraries as well and use a language you're more familiar with doing Oracle operations with
I have a functioning application using Spring Boot, Rabbit MQ & MySQL DB locally. I'm curious, how I can upload this app to the AWS Environment and get it working seamlessly.
The only part where I'm lost is how to get RabbitMQ in the cloud? Any suggestions?
I see three options for your needs :
Use AmazonMQ managed service. This uses ActiveMQ under the hood, and supports the AMQP protocol (so you can continue to use the RabbitMQ client). Here's an article on how to do it : https://aws.amazon.com/blogs/compute/migrating-from-rabbitmq-to-amazon-mq/.
Use a third-party managed service (such as CloudAMQP). This is similar to the first option, but you can choose a RabbitMQ provider if you wish.
Install RabbitMQ on an EC2 instance and manage it yourself. This is the most flexible option, but it will require more effort on your part and it will probably cost more. I would recommend this option only if you have special requirements that are not met by using a hosted service.
In all cases, I would also recommend to use a messaging library such as Spring Messaging or Apache Camel to isolate your code from your messaging implementation. This will reduce the boilerplate code you need for messaging and allows you to focus on your application logic.
I am playing around with Spring Boot v2 at the moment. So far, my set up looks like this:
Spring -> Telegraf -> Kafka -> Telegraf -> influx
I am wondering whether or not it's possible to take out the the first telegraf inbetween Spring and Kafka, so something like this:
Spring -> Kafka -> Telegraf -> Influx
I've looked at the configurations of micrometer and there is no config for Kafka. Also, telegraf was pulling data from Spring.. and as Kafka is a push model (i.e. you are pushing data into Kafka), would Spring be able to push data to Kafka? If yes, how? Through the use of HTTP POST methods?
New to the whole concept.
would Spring be able to push data to Kafka? If yes, how? Through the use of HTTP POST methods?
Kafka uses its own TCP protocol, not HTTP so no. At least not without using the Kafka REST Proxy.
You would basically be embedding the same thing that Telegraf does into your Spring code.
It's possible, sure, but built into Micrometer? Not that I'm aware of.
Plus, it would be overhead on your app having an internal producer thread, and you'd be required to include kafka clients with each of your monitored apps, plus have some control preventing your app from failing if Kafka connection isn't possible...
I would suggest keeping Telegraf installed on each host machine, or at the very least, Prometheus JMX exporter or Jolokia for your individual Java apps. From this, JMX metrics can be collected and pushed to downstream monitoring systems
Or, as commented, you could skip Kafka, but I'm guessing you want to keep it there as a buffer.
On the other side, you can use Kafka Connect Influxdb sink to get optimal performance of consumer scaling
I'm trying to run kafka connect in distributed mode. Is REST the only way to start the connector? Otherwise, what commands should i use ?
The Kafka Connect API is part of Apache Kafka. You can run it standalone, or as part of Confluent Platform.
Information on how to configure it is here. If you are using distributed mode, you have to use the REST API to configure it.