We’ve got a veritable treasure trove of resources today! Francesco Tisiot explains the vital issue of message ordering, Michael Drogalis discusses GraalVM as a possible leveler when it comes to stream processing in your language of choice, and we’ve also got an intro to jq. Read on…

Apache Kafka® Resources:

• “Editors. Tabs vs. spaces. Programming languages. Some hills are worth dying on.” Michael Drogalis discusses the tradeoffs of working with stream processing in your native programming language.
• Ready for a deep scuba dive into message ordering in Kafka topics? Let Francesco Tisiot be your guide in this article.
• You’ve submitted an abstract, and it was accepted! Now, to write the talk… Read Robin Moffatt’s tips in his blog post on crafting a new tech talk. If you’re still thinking about a CFP, check out Danica Fine’s twitter thread
• Robbie Palmer looks at the overlap between machine learning and data streaming
• Jim Galasyn teaches us how to make Stream Designer Pipelines

Terminal Tip of the Week:

This one is back-to-basics for some, but for anyone unfamiliar with jq, it’s an introductory command. A curl request to the mock API, JSONplaceholder, returns an object:

curl -X GET https://jsonplaceholder.typicode.com/posts/1
{
  "userId": 1,
  "id": 1,
  "title": "sunt aut facere repellat provident occaecati excepturi optio reprehenderit",
  "body": "quia et suscipit\nsuscipit recusandae consequuntur expedita et cum\nreprehenderit molestiae ut ut quas totam\nnostrum rerum est autem sunt rem eveniet architecto"
}

What if we wanted only the body of that object? Jq to the rescue! We can use its Object-Identifier Index, signified by a dot before the name of the object, to filter out the rest of the data:

❯ curl -X GET https://jsonplaceholder.typicode.com/posts/1 | jq .body
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100   292  100   292    0     0   2554      0 --:--:-- --:--:-- --:--:--  2561
"quia et suscipit\nsuscipit recusandae consequuntur expedita et cum\nreprehenderit molestiae ut ut quas totam\nnostrum rerum est autem sunt rem eveniet architecto"

There’s much more you can do with jq, but you can already see how useful it is for filtering terminal output.

Links From Around the Web:

• How the heck does one measure color?
• An explorable explainer of k-means clustering
• Beautiful command line interface style guidelines

In Other News:

Kafka Summit London is happening soon, May 16-17! Register at the conference home page.

Join Kafka developers in-person for a meetup in Atlanta! Other upcoming opportunities to network and learn are

• In Person in London on Kafka Streams in FinTech & Microservices KStreams accelerator
• Join us virtually for a chat on Apache Kafka and Azure Connectors with a hands on workshop

If you’d like to view previous editions of the newsletter, visit our archive.

P.S. If you want to learn more about Kafka or Confluent Cloud, visit our developer site at Confluent Developer.