Apache Camel With Kafka? The 145 Detailed Answer

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In general terms, a comparison between Apache Camel and Apache Kafka is (partly) like comparing apples and pears. As a matter of fact, Apache Camel is a complete integration framework, while Apache Kafka is a distributed messaging platform. So, at high level, they don’t exclude each other.

What is Kafka and How to use Kafka with SpringBoot and Apache Camel?

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Can I use Apache Camel without Kafka?

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Camel is ETL framework it can transform messages/events/data from “any” (see endpoint list by Camel) input point and send it to “any” output Apache Camel – Enterprise Integration Patterns. You may use Camel without Kafka at all, and vice versa. But there are of course possibilities to use succesfully both together. Case 1.

Kafka is messaging platform with streaming ability to process messages Apache Kafka. Camel is ETL framework it can transform messages/events/data from “any” (see endpoint list by Camel) input point and send it to “any” output Apache Camel – Enterprise Integration Patterns. You may use Camel without Kafka at all, and vice versa.

What is the difference between Apache Camel and Apache Kafka?

As far as I know, Apache Kafka is asynchronous messaging platform, where as Apache Camel is a platform implementing the enterprise integration patterns. So, what are the practical differences of Apache Camel and Apache Kafka?

Should I use camel or Kafka for data integration?

If you “just” need an integration framework to route data from a source to one or more sinks (= ETL / ESB), then Camel can be used, too. However, Kafka kills two birds with one stone (= integrating data AND processing it in motion where needed). Plenty of Kafka offerings is available on the market.

How to use camel-demo-a in Kafka?

camel-demo-a will publish the data to Kafka topic which will be consumed by camel-demo-b In the pom.xml of both the microservices, add the below dependency. The route is configured to read from the file and publish to Kafka topic: Let us assume that the sender route is publishing a JSON message, which we will unmarshal and do some processing.

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How to write a camel route for consuming a message?

A Camel route for consuming a message is simple to be written, as follows: The URI is substituted when starting the route with properties configured in the application.yml. When consuming from that endpoint, it gets called the component which is a simple consumer of the messages arriving to the Kafka topic : the ConsumerBean.

How to start Apache Kafka from Java?

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Now lets start Apache Kafka. As we had explained in detail in the Getting started with Apache Kafka perform the following. Open a new command prompt and create a topic with name javainuse-topic, that has only one partition & one replica. Next start the Apache Camel Application by running it as a Java Application.

How to install Apache Kafka on Windows?

Step 1: To install Apache Kafka, the java8 JDK kit should be installed on the system. If it is already installed, but with other versions, the user needs to reinstall Java.

How to write a simple consumer example in Apache Kafka?

Following is a step by step process to write a simple Consumer Example in Apache Kafka. 1. Create Java Project Create a new Java Project called KafkaExamples, in your favorite IDE. In this example, we shall use Eclipse. But the process should remain same for most of the other IDEs. 2. Add Jars to Build Path

What are the requirements to learn Apache Kafka?

It is expected that the users are having a basic knowledge of java. There are few requirements which need to be fulfilled while working with Apache Kafka: An IDE tool such as Notepad, Eclipse, IntelliJ IDEA, etc. In this tutorial, we will use IntelliJ IDEA as well as Maven3 build tool for learning Apache Kafka. What is Maven?

Is my Java app a Kafka producer or consumer?

Your Java app now has both a Kafka producer and a consumer, so let’s test it all together! Restart your application, and go to http://localhost:8080/kafka/messages. Right now, no information is being returned.

How to create a split topic in Apache Camel?

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Open a new command prompt and create a topic with name javainuse-topic, that has only one partition & one replica. Next start the Apache Camel Application by running it as a Java Application. The above file content will be sent to split line by line and sent to kafka.

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In non-streaming mode (default) the splitter will split each message first, to know the total size, and then process each message one by one. This requires to keep all the split messages in memory and therefore requires more memory. The total size is provided in the org.apache.camel.Exchange#SPLIT_SIZE header.

What is Apache Camel framework?

Apache Camel is an open source framework. It is a message-oriented middleware that provides rule-based routing and mediation engine. You can define rules such as if it is a “milk” order redirect it to a milk vendor and if it is an “oil” order redirect it to an oil vendor, and so on.

How to use the log component in camel?

The Log component allows you to log messages to the underlying logging mechanism. Camel uses Simple Logging Facade for Java (SLF4J) as an abstraction to various logging frameworks. You may use java.util.logging, logback, log4j for logging. This code snippet illustrates the use of the Log component −

Why use camel instead of XML for configuring Java rules?

It means that you can use your familiar Java IDE to define these rules in a type-safe environment. We do not need to use XML configuration files, which typically tend to be bulky. Camel though supports XML configuration through Spring framework, if you prefer to use XML for configuring the rules.

What is the difference between splitme and camel and Saxon?

The bean method splitMe uses Exchange as parameter, however Camel supports Bean Parameter Binding, which allows using other parameters types instead. The XPath engine in Java and Saxon will load the entire XML content into memory. And thus they are not well suited for very big XML payloads.

Is camel the right choice for Kafka central nervous system?

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Only a “routing machine”, i.e., not built for long-term storage (additional cache or storage needed), for that reason, Camel is not the right choice for a central nervous system like Kafka No stream processing (like you know it from Kafka Streams or Apache Flink) No powerful visual coding like you know it from proprietary ETL/ESB/iPaaS tools

What is the camel framework?

The Camel framework is based on Spring. So, you can program Camel “routes” as XML, Scala, and — my favorite — fluent-style Java code. Camel provides an inversion of control (IoC) approach to data routing. This approach allows for a seamless transition of messaging data between a wide variety of integration components.

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What message header(s) does Kafka Component support?

The Kafka component supports 13 message header (s), which is/are listed below: Explicitly specify the partition. The partition where the message was stored. Required Producer: The key of the message in order to ensure that all related message goes in the same partition. Consumer: The key of the message if configured.

How to deal with exceptions in Camel Camel consumer?

By default the consumer will use the org.apache.camel.spi.ExceptionHandler to deal with exceptions, that will be logged at WARN or ERROR level and ignored. To let the consumer use a custom ExceptionHandler.

Why Apache Camel is the best choice?

There’s a lot that goes into a stack. And Apache Camel is the best choice to handle complexities of the code for handling the routing, transformation, scheduling, error handing, redelivery, and aggregation of batches and streams of messages.

References:

Apache Camel Integration with Kafka – DZone Integration

Apache Camel Kafka Connector Simplified: A …

Apache Camel vs Apache Kafka – Masterspringboot – Camel

Apache Camel vs Apache Kafka – Stack Overflow

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Questions just answered:

What is Apache Camel framework?

How to use the log component in camel?

Why use camel instead of XML for configuring Java rules?

What is the difference between splitme and camel and Saxon?

How to create a split topic in Apache Camel?

How to install Apache Kafka on Windows?

How to write a simple consumer example in Apache Kafka?

What are the requirements to learn Apache Kafka?

Is my Java app a Kafka producer or consumer?

How to start Apache Kafka from Java?

What is the camel framework?

What message header(s) does Kafka Component support?

How to deal with exceptions in Camel Camel consumer?

Why Apache Camel is the best choice?

Is camel the right choice for Kafka central nervous system?

What is the difference between Apache Camel and Apache Kafka?

Should I use camel or Kafka for data integration?

How to use camel-demo-a in Kafka?

How to write a camel route for consuming a message?

Can I use Apache Camel without Kafka?

apache camel with kafka

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