What is Kafka Connect?
Kafka Connect is the integration API for Apache Kafka. Check out this video for an overview of what Kafka Connect enables you to do, and how to do it.
$ kafkacat -b broker:29092 -t mytestopic -C -e -q| wc -l
3Counting the number of messages in a Kafka topic
There’s ways, and then there’s ways, to count the number of records/events/messages in a Kafka topic. Most of them are potentially inaccurate, or inefficient, or both. Here’s one that falls into the potentially inefficient category, using kafkacat to read all the messages and pipe to wc which with the -l will tell you how many lines there are, and since each message is a line, how many messages you have in the Kafka topic:
Poking around the search engines in Google Chrome
Google Chrome automagically adds sites that you visit which support searching to a list of custom search engines. For each one you can set a keyword which activates it, so based on the above list if I want to search Amazon I can just type a <tab> and then my search term
🤖Building a Telegram bot with Apache Kafka, Go, and ksqlDB
I had the pleasure of presenting at DataEngBytes recently, and am delighted to share with you the 🗒️ slides, 👾 code, and 🎥 recording of my ✨brand new talk✨:
Telegram bot - BOT_COMMAND_INVALID
A tiny snippet since I wasted 10 minutes going around the houses on this one…
tl;dr: If you try to create a command that is not in lower case (e.g. Alert not alert) then the setMyCommands API will return BOT_COMMAND_INVALID
Learning Golang (some rough notes) - S02E09 - Processing chunked responses before EOF is reached
The server sends Transfer-Encoding: chunked data, and you want to work with the data as you get it, instead of waiting for the server to finish, the EOF to fire, and then process the data?
Learning Golang (some rough notes) - S02E08 - Checking Kafka advertised.listeners with Go
At the beginning of all this my aim was to learn something new (Go), and use it to write a version of a utility that I’d previously hacked together in Python that checks your Apache Kafka broker configuration for possible problems with the infamous advertised.listeners setting. Check out a blog that I wrote which explains all about Apache Kafka and listener configuration.
You can find the code at https://github.com/rmoff/kafka-listeners It’s been a fun journey, and now I am pleased to be able to show the results of it.
Learning Golang (some rough notes) - S02E07 - Splitting Go code into separate source files and building a binary executable
So far I’ve been running all my code either in the Go Tour sandbox, using Go Playground, or from a single file in VS Code. My explorations in the previous article ended up with a a source file that was starting to get a little bit unwieldily, so let’s take a look at how that can be improved.
Within my most recent code, I have the main function and the doProduce function, which is fine when collapsed down:
Learning Golang (some rough notes) - S02E06 - Putting the Producer in a function and handling errors in a Go routine
When I set out to learn Go one of the aims I had in mind was to write a version of this little Python utility which accompanies a blog I wrote recently about understanding and diagnosing problems with Kafka advertised listeners. Having successfully got Producer, Consumer, and AdminClient API examples working, it is now time to turn to that task.
