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The dark mode beta is finally here. Change your preferences any time. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. I have a producer that's producing protobuf messages to a topic. I have a consumer application which deserializes the protobuf messages. But hdfs sink connector picks up messages from the Kafka topics directly. What's the best way to do this? Thanks in advance! Kafka Connect is designed to separate the concern of serialization format in Kafka from individual connectors with the concept of converters.
As you seem to have found, you'll need to adjust the key. These classes are commonly implemented as a normal Kafka Deserializer followed by a step which performs a conversion from serialization-specific runtime formats e. Message in protobufs to Kafka Connect's runtime API which doesn't have any associated serialization format -- it's just a set of Java types and a class to define Schemas. I'm not aware of an existing implementation. The main challenge in implementing this is that protobufs is self-describing i.
The dark mode beta is finally here. Change your preferences any time. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. I am receiving protobuf messages on kafka, the consumer is configured to deserialize the events using. If I use parseFrom byte data method of com. Parser by passing byte array of the deserialized event string, the method throws following exception:.
You are using a String deserializerwhich expects certain special characters to define the message's limits. It tries to deserialize a STRING but he receives just a bunch of bytes with a format the consumer doesn't expect at all.
You have a producer which serializes with ByteArraySerializerso your consumer must deserialize it with a ByteArrayDeserializer.
Try producing with a org. StringSerializer if you really want to automatically deserialize in String format. Learn more. Parsing kafka protobuf event through string deserialization Ask Question. Asked 2 years, 3 months ago. Active 1 year, 11 months ago. Viewed 1k times.
I am receiving protobuf messages on kafka, the consumer is configured to deserialize the events using value. StringDeserializer If I use parseFrom byte data method of com. Parser by passing byte array of the deserialized event string, the method throws following exception: com.
InvalidProtocolBufferException: While parsing a protocol message, the input ended unexpectedly in the middle of a field. This could mean either than the input has been truncated or that an embedded message misreported its own length.
If I instead deserialize kafka events with value. ByteArrayDeserializer and directly pass the byte array thus received to parseFromprotobuf is correctly parsed without any exception.
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Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. I am trying to write a Kafka consumer of a protobuf using structured streaming. Let's call the protobuf being A which should be deserialized as byte array Array[Byte] in Scala.
I tried all the methods I can find online but still could not figure out how to correctly parse message A. But even if I do getBytes to convert string to byte in order to parse my message A, I get:.
But got error message:. The above three methods are probably all the methods I can find online. It should be a simple and common question, so if anyone have insight into it, please let me know. So the key and value are actually in Array[Byte]. You will have to perform deserialization in Dataframe operations. Learn more. Asked 6 months ago.
Active 6 months ago. Viewed times. But even if I do getBytes to convert string to byte in order to parse my message A, I get: Exception in thread "main" java. Caused by: com. JsonMappingException: Incompatible Jackson version: 2.
But got error message: Schema for type A is not supported The above three methods are probably all the methods I can find online. Active Oldest Votes. For e. Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password. Post as a guest Name.
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Using Google's Protocol Buffers With Java
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Spring Kafka – JSON Serializer and Deserializer Example
Hot Network Questions.Comment 3. Effective Java, Third Edition was recently releasedand I have been interested in identifying the updates to this classic Java development book, whose last edition only covered through Java 6. There are obviously completely new items in this edition that are closely related to Java 7Java 8and Java 9 such as Items 42 through 48 in Chapter 7 "Lambdas and Streams"Item 9 "Prefer try-with-resources to try-finally"and Item 55 "Return optionals judiciously".
I was very slightly surprised to realize that the third edition of Effective Java had a new item not specifically driven by the new versions of Java, but that was instead was driven by developments in the software development world independent of the versions of Java.
That item, Item 85 "Prefer alternatives to Java Serialization" is what motivated me to write this introductory post on using Google's Protocol Buffers with Java. After outlining the dangers of Java deserialization and making these bold statements, Bloch recommends that Java developers employ what he calls to avoid confusion associated with the term "serialization" when discussing Java "cross-platform structured-data representations.
I found this mention of Protocol Buffers to be interesting because I've been reading about and playing with Protocol Buffers a bit lately. Google 's Protocol Buffers is described on its project page as "a language-neutral, platform-neutral extensible mechanism for serializing structured data. The examples in this post are based on Protocol Buffers 3.
It covers a lot more possibilities and things to consider when using Java than I will cover here. The first step is to define the language-independent Protocol Buffers format. This a done in a text file with the. For my example, I've described my protocol format in the file album. Although the above definition of a protocol format is simple, there's a lot covered. The first line explicitly states that I'm using proto3 instead of the assumed default proto2 that is currently used when this is not explicitly specified.
The two lines beginning with option are only of interest when using this protocol format to generate Java code and they indicate the name of the outermost class and the package of that outermost class that will be generated for use by Java applications to work with this protocol format.
The "message" keyword indicates that this structure, named "Album" here, is what needs to be represented.
There are four fields in this construct with three of them being string format and one being an integer int Two of the four fields can exist more than once in a given message because they are annotated with the repeated reserved word. Note that I created this definition without considering Java except for the two option s that specify details of generation of Java classes from this format specification.
The album. This generation of Java source code file is accomplished using the protoc compiler that is included in the appropriate operating system-based archive file. In my case, because I'm running this example in Windows 10, I downloaded and unzipped protoc The next image depicts my running protoc against album.
For running the above, I had my album.GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together. Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community. Already on GitHub? Sign in to your account. Having some Kafka properties defined in SpringBoot autoconfig vs some Kafka properties having to be set in a separate "properties" map is not intuitive and is therefore confusing to junior devs.
I propose that "security. This would be a step towards and is similar to It could. However, given that is in the general backlog, I think we should consider treating it like and tackling it in 2. Closing in favour of PR Skip to content.
Dismiss Join GitHub today GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together. Sign up. New issue. Jump to bottom. Labels status: superseded type: enhancement.
Copy link Quote reply. Spring Boot version: 2. StringSerializer value-serializer: org. Woodz mentioned this issue Dec 4, How can I set consumer property "security. This comment has been minimized. Sign in to view. Automatically set "security.
Add security. Closes spring-projectsgh Sign up for free to join this conversation on GitHub. Already have an account?
Change your preferences any time. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. Take a look at the parameters of serialize method in org. That way you can just pass MockEvent to Kafka. I have never worked with protobuf messages, nor do I know what it is.
But your stacktrace is very specific about the error. Learn more.Apache Kafka Consumer Example using SpringBoot - Java Techie
How set protobuf param for spring kafka? Asked 1 year, 9 months ago. Active 1 year, 9 months ago. Viewed times. When I use spring-boot and spring-kafka, and my code like the follow: application. BytesDeserializer spring. StringSerializer spring.
AppInfoParser : Kafka version : 1. AppInfoParser : Kafka commitId : caa65fe org. SerializationException: Can't convert value of class com. MockEvent to class org. BytesSerializer specified in value. ClassCastException: com. MockEvent cannot be cast to org. Bytes at org. What are you asking? You have posted two different problems. One on github link and on here on stackoverflow. I will not answer github issues on stackoverflow, so if you want a more precise answer, then please post your full question on stackoverflow.
Active Oldest Votes. Your value serializer is not compatible with MockEvent. You need to pass Bytes as message to Kafka and not MockEvent. The Overflow Blog. The Overflow How many jobs can be done at home? Featured on Meta. Community and Moderator guidelines for escalating issues via new response…. Feedback on Q2 Community Roadmap.Followed by reading the values inside the KafkaListener using Header annotation and MessageHeaders class. We use Apache Maven to manage our project dependencies.
Make sure the following dependencies reside on the class-path. Important: We need to include the com. The 0.
We configure the KafkaTemplate inside the SenderConfig class. For simplicity we used a StringSerializer for both key and value fields. Previously we saw how to send custom header values.
Now we are going to read those values. We have a couple of options. We can inject each header individually using the Header annotation.
Or we can inject the MessageHeaders which you can use to iterate over each header. You can use whichever you find more suitable. We also create a application.
These properties are injected in the configuration classes by spring boot. Finally, we wrote a simple Spring Boot application to demonstrate the application.
In order for this demo to work, we need a Kafka Server running on localhost on portwhich is the default configuration of Kafka. May 29, February 8, April 24, Discover more articles. Download it — spring-kafka-custom-header-values-example. Notify of.