Kafdrop setupOn 29.10.2020 by Arashigul
Choosing the right messaging system during your architectural planning is always a challenge, yet one of the most important considerations to nail.
As a developer, I write applications daily that need to serve lots of users and process huge amounts of data in real time. Spring Boot is a framework that allows me to go through my development process much faster and easier than before.
It has come to play a crucial role in my organization. As the number of our users quickly grew, we realized our apparent need for something that could process as many as 1, events per second. And since that moment, Kafka has been a vital tool in my pocket.
Why did I choose it, you ask? Based on my experience, I provide here a step-by-step guide on how to include Apache Kafka in your Spring Boot application so that you can start leveraging its benefits too.
I recommend using the Confluent CLI for your development to have Apache Kafka and other components of a streaming platform up and running. After reading this guide, you will have a Spring Boot application with a Kafka producer to publish messages to your Kafka topic, as well as with a Kafka consumer to read those messages. Now, you can see what it looks like. Next, we need to create the configuration file. We need to somehow configure our Kafka producer and consumer to be able to publish and read messages to and from the topic.
Instead of creating a Java class, marking it with Configuration annotation, we can use either application. Spring Boot allows us to avoid all the boilerplate code we used to write in the past, and provide us with much more intelligent way of configuring our application, like this:.
If you want to get more about Spring Boot auto-configuration, you can read this short and useful article. For a full list of available configuration properties, you can refer to the official documentation. To set it up, enter the following:.
In your real application, you can handle messages the way your business requires you to. If we already have a consumer, then we already have all we need to be able to consume Kafka messages. To fully show how everything that we created works, we need to create a controller with single endpoint. The message will be published to this endpoint, and then handled by our producer. In fewer than 10 steps, you learned how easy it is to add Apache Kafka to your Spring Boot project.
If you followed this guide, you now know how to integrate Kafka into your Spring Boot project, and you are ready to go with this super tool! You can also find all the code in this article on GitHub. This is a guest post by Igor Kosandyak, a Java software engineer at Oril, with extensive experience in various development areas.
While ksqlDB and Kafka Streams […]. Less than six months ago, we announced support for Microsoft Azure in Confluent Cloud, which allows developers using Azure as a public cloud to build event streaming applications with Apache […].Lenses is compatible with your Cloud setup and Kafka Managed Services. Select cloud provider. Amazon Marketplace. Azure HDInsight. Azure Marketplace. Google Cloud. Other Managed Clouds. Find out our Open Source Apache 2. Get the latest archives of Lenses for a manual Linux setup.
Learn more. Deploy Lenses as Docker container. Learn More or simply Docker Pull! Helm, a package manager for Kubernetes, is the recommended way to install Lenses. Read the docs. Enables scalable streaming SQL queries over Kafka on a single click. Integrates with Kubernetes or VM setups. Learn More. Lenses Box is a single Docker container setup optimized for Kafka Development environments.
Contains a single broker installation of Kafka, including the required services, open source connectors and of course Lenses and Lenses CLI. Lenses Enterprisedoes not contain or is thight to any Kafka setup. You can configure it to connect to your own cluster. Lenses has simplified the deployment in cloud providers using its own provisioning and management cloud templates tailored to the particular cloud.
You may need to refresh your key from time to time for security reasons. Lenses is a Docker container that includes all required services for a Kafka Setup. The setup contains one instance of each service for example 1 Kafka broker, 1 Connect worker etc. For production environments it is recommended to have a multi-node setup for scalability and fail-over use cases.
Also, Lenses Box allows up to 25M records on the cluster. However, if you want to use Lenses Box with over 25M records or for a production deployment you will require a License. Lenses Box is a Docker container which includes a single kafka broker setup. If you want to try out Lenses with your own cluster you will require Lenses Enterprise. We make it easy! Lenses Box.Explore key steps for implementing a successful cloud-scale monitoring strategy.
Kafka deployments often rely on additional software packages not included in the Kafka codebase itself—in particular, Apache ZooKeeper.
A comprehensive monitoring implementation includes all the layers of your deployment so you have visibility into your Kafka cluster and your ZooKeeper ensemble, as well as your producer and consumer applications and the hosts that run them all. To implement ongoing, meaningful monitoring, you will need a platform where you can collect and analyze your Kafka metrics, logs, and distributed request traces alongside monitoring data from the rest of your infrastructure.
With Datadog, you can collect metrics, logs, and traces from your Kafka deployment to visualize and alert on the performance of your entire Kafka stack.
Datadog automatically collects many of the key metrics discussed in Part 1 of this series, and makes them available in a template dashboard, as seen above. Before you begin, you must verify that Kafka is configured to report metrics via JMX. You should see data from the MBeans described in Part 1.
The Datadog Agent is open source software that collects metrics, logs, and distributed request traces from your hosts so that you can view and monitor them in Datadog. Installing the Agent usually takes just a single command. Install the Agent on each host in your deployment—your Kafka brokers, producers, and consumers, as well as each host in your ZooKeeper ensemble. Once the Agent is up and running, you should see each host reporting metrics in your Datadog account. Next you will need to create Agent configuration files for both Kafka and ZooKeeper.
You can find the location of the Agent configuration directory for your OS here. In that directory, you will find sample configuration files for Kafka and ZooKeeper. To monitor Kafka with Datadog, you will need to edit both the Kafka and Kafka consumer Agent integration files. See the documentation for more information on how these two integrations work together. The configuration file for the Kafka integration is in the kafka. The ZooKeeper integration has its own configuration file, located in the zk.
On each host, copy the sample YAML files in the relevant directories the kafka. The kafka.It solves problems that the Kafka community has been crying out for, bringing Event Sourcing and Big Data into closer reach of many developers.
The story told so many times: A tech company graced with a few highly-motivated individuals, in an attempt to boost its credibility and one-up its industry rivals, releases an open-source project. Something of genuine value; a truthful act of generosity as it were. The project gains traction, driven by those few individuals; GitHub stars fly, Docker pulls happen and the community is euphoric.
Circa Kafka is undoubtedly among the best things that have happened in the world of message-oriented middleware in the last decade, if not more. As a distributed systems researcher, I say this without exaggeration. Kafka almost singlehandedly turned the world of event streaming and big data on its head. And having offered a flexible model for the production and consumption of messages, it has since done the same for message queues. At this point the reader would be wise to remark: But Kafka is not a message queue!
Indeed, and that is what makes it so good: not being a message queue, makes it the best message queue. In all ways but one: tooling. It is abysmal.
Want to browse the contents of the topics, view consumer groups, offsets, broker topology, and topic configuration? That all changed in when Kafdrop was released. Fate or rather, my unquenchable habit of enjoying a dinner each night placed me at a large corporate bookmaker in Australia — who, as odds would have it, decided to bet their ranch on a microservices architecture, held together by a certain popular event-oriented messaging backbone.
When Kafdrop became available, we jumped on it, along with companion tools such as Kafka Manager and Burrow. Significant changes brought about in versions 0. Fast-forward to and the original Kafdrop, which is at version 2-point-something, is at least 4 years behind the eight ball.
Run it against the current Kafka version 2. TLS support is non-existent, and neither is authentication. You try pulling down the repo, install a JDK and Maven in hope of cutting your build, then realise the build is broken and has been in that state for many months. In May the Kafdrop 2. Naturally, the new fork was christened Kafdrop 3.
Almost all of the code had to be rewritten from the ground up. It happened in large chunks, each time targeting some bit of functionality that was badly broken.Kafdrop is a web UI for viewing Kafka topics and browsing consumer groups.
The tool displays information such as brokers, topics, partitions, consumers, and lets you view messages. This project is a reboot of Kafdrop 2. Note: As of Kafdrop 3. All necessary cluster information is retrieved via the Kafka admin API. The port can be overridden by adding the following config:. Finally, a default message format e. This can also be configured at the topic level via dropdown when viewing messages. In case of protobuf message type, the definition of a message could be compiled and transmitted using a descriptor file.
Thus, in order for kafdrop to recognize the message, the application will need to access to the descriptor file s.
Kafdrop will allow user to select descriptor and well as specifying name of one of the message type provided by the descriptor at runtime. Images are hosted at hub.
Hey there! We hope you really like Kafdrop!
Replace 3. Services will be bound on port by default node port There is a docker-compose. Starting with version 2. Some endpoints are JSON only:.
Need to check for tool to monitor Kafka in production. Also tool does not need to have license or heavy hardware. In particular I need a tool to evaluate consumer offset on topic,health of topic. It enables faster monitoring of Kafka data pipelines. Note that this is recommended for development environments. Confluent Another option is Confluent Enterprise which is a Kafka distribution for production environments. It also includes Control Centrewhich is a management system for Apache-Kafka that enables cluster monitoring and management from a User Interface.
Yahoo Kafka Manager Kafka's Manager is a tool for monitoring Kafka offering less functionality compared to the aforementioned tools. The tool displays information such as brokers, topics, partitions, and even lets you view messages. It is a light weight application that runs on Spring Boot and requires very little configuration. LinkedIn Burrow Burrow is a monitoring companion for Apache Kafka that provides consumer lag checking as a service without the need for specifying thresholds.
It monitors committed offsets for all consumers and calculates the status of those consumers on demand. An HTTP endpoint is provided to request status on demand, as well as provide other Kafka cluster information.
There are also configurable notifiers that can send status out via email or HTTP calls to another service. It provides an intuitive UI that allows one to quickly view objects within a Kafka cluster as well as the messages stored in the topics of the cluster. It contains features geared towards both developers and administrators. I am afraid that you will not find any free products suitable for production environments but if you cannot afford it then go for Yahoo Kafka Manager, LinkedIn Burrow or KafDrop.
Confluent's and Landoop's products are the best out there but unfortunately, they require licensing. There are several free monitoring solutions, but all have their limitations. Confluent Control Center is perfectly suited to your requirement, however it does require a licence.Spring Boot with Spring Kafka Producer Example - Tech Primers
There is a 30 day free trial available. It takes things beyond just monitoring a bunch of metrics, to actually monitoring individual topics and the messages flowing through and checksumming each to ensure accurate reporting of consumption.
You can use any JMX client to get it. It depends on the extent of monitoring and level of automation. For instance, do you need to monitor the health of your consumers?
Do you need to view the contents of topics to debug applications, perform post-mortem, trace message flow, etc.? I'd suggest adding a few more items into your toolbox:.Comment 0. Kafka itself comes with command line tools that can perform all necessary administrative tasks.
Moreover, it is getting difficult to work with them when your clusters grow large, or when you have several clusters. The first is Kafka Tool. It is a Windows program that can connect to a Kafka cluster and do all basic tasks. It can list brokers, topics, or consumers and their properties. It allows you to create new topics or update existing ones, and you can even look at the messages in a topic or partition.
Although it is very useful, its UI seems somewhat old, and it lacks some monitoring features, such as topic lag. Also, it is not free for commercial use. So, you can't really use it at work unless you pay for it. Technically you can, but this would violate the licensing terms and put you and your employer at risk. Kafka Manager is a web-based management system for Kafka developed at Yahoo.
It is capable of administrating multiple clusters ; it can show statistics on individual brokers or topics, such as messages per second, lag, and etc.
But, it's more of an administrative tool. Unfortunately, you can't use it to browse messages. It also requires access to ZooKeeper nodes, so you might not be able to use it in some production environments, where ZooKeeper nodes are typically firewalled. Edit application. Now you should build Kafka Manager. It uses the play framework, but it is installed and configured automatically unlike Kafka web console that is discussed later.
In the directory where you unzipped it, run:. This can take a long time to complete about 30 minutes on the first build, as it has to download a bunch of dependencies. This will create a distribution file. This is the default, but you can change it by adding -Dhttp.
Kafdrop is a web UI for viewing Kafka topics and browsing consumer groups. The tool displays information, such as brokers, topics, partitions, consumers, and lets you view messages. Kafdrop seems modern and very impressive, and its capabilities are very similar to those of Kafka Manager, but with more focus on letting you view the contents of the brokers. Its features include:. When it starts, open your browser to localhost :.
How to Work with Apache Kafka in Your Spring Boot Application
Another tool worth mentioning is Burrow from LinkedIn. We will not cover it in detail this time because it does not fall into the same category as the previous tools mentioned here.
It does not have a graphical user interface, and it does not have any cluster management capabilities.
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