.NET for Apache Spark – UDF, VS2019, Docker for Windows and a Christmas Puzzle

.NET for Apache Spark Container


The latest version of my docker image for .NET for Apache Spark tries to support direct debugging from Visual Studio 2019 and Visual Studio Code.
This is the first article of a small series that will show how this can be done on different environments (Windows and Linux), and what limitations might exist.

Test application & data

I have put together a very simple C# application, named “HelloUdf”, for demonstration purposes. It is supposed to read a JSON file (coordinates.json) that contains one coordinate string per line.
Besides reading the file, the application’s task is … more

PostgreSQL & Grafana – Real-time data processing pipeline – Part 6

Believe it or not, we are getting to the end of this small series about a potential real-time data processing pipeline.
In this final part I will show how Grafana can retrieve our pipeline data from PostgreSQL and visualize it as a graph. But before we dive into it, let’s have a quick recap of the previous topics.

So the bit that is still missing, is the visualization of data.

Starting the docker image

To keep things simple, I … more

Spark to PostgreSQL – Real-time data processing pipeline – Part 5

Previously I have demonstrated how streaming data can be read and transformed in Apache Spark. This time I use Spark to persist that data in PostgreSQL.

Quick recap – Spark and JDBC

As mentioned in the post related to ActiveMQ, Spark and Bahir, Spark does not provide a JDBC sink out of the box. Therefore, I will have to use the foreach sink and implement an extension of the org.apache.spark.sql.ForeachWriter. It will take each individual data row and write it to PostgreSQL.

Preparing PostgreSQL

TimescaleDB logo

Even though I want to use PostgreSQL, I am actually


Real-time data processing pipeline – Part 4 – data transformation

So far, we know how to get our streaming data from ActiveMQ into Spark by using Bahir. On this basis, it is now time to implement the data transformation required to get to the desired output format.


As a quick reminder, here is the Scala code that I have used so far to retrieve the data from ActiveMQ and write it to a memory sink.


import org.apache.spark.sql.SparkSession
import org.apache.spark.sql.functions._
import org.apache.spark.sql.types._

// create a named session
val spark = SparkSession

// read data from the OscStream topic
val mqttDf = 

ActiveMQ, Spark & Bahir – Real-time data processing pipeline – Part 3

ActiveMQ, Spark & Bahir - Real-time data processing pipeline – Part 3

Having explained how to visually simulate sensor data and how to get it into ActiveMQ during the first two parts, it is now time to explore an initial setup that allows Apache Spark to read a data stream from ActiveMQ using Bahir.

Things to be aware of

Before we start, there are a couple of things you should be aware of, in case you want to follow along and try this out yourself.

Spark & Bahir version matching

Apache Bahir Spark Extensions 2.3.3

As stated above, I would like to subscribe to an ActiveMQ topic with Apache Bahir to transfer

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