Career Coaching for Data Professionals
Building trustworthy data pipelines because AI cannot learn from dirty data
PySpark-Check - data quality validation for PySpark 3.0.0
Last week, I was testing whether we can use AWS Deequ for data quality validation. I ran into a few problems. First of all, it was using an outdated version...
06 Jul 2020
Measuring data quality using AWS Deequ
How to measure data quality in Athena tables using AWS Deequ running on an EMR cluster.
29 Jun 2020
How to conditionally skip tasks in an Airflow DAG
How to use XCom and PythonSensor to skip remaining tasks in an Airflow DAG.
22 Jun 2020
The problem with software testing in data engineering
What if we found a bug in our data pipelines? What if that bug were easy to fix, but it would require a lot of time spent backfilling the data?...
15 Jun 2020
How does Kafka Connect work?
In this article, I am going to describe the internals of Kafka Connect, explain how it uses the Sink and Source Connectors, and how it tracks the offsets of the...
08 Jun 2020
Why my Airflow tasks got stuck in "no_status" and how I fixed it
A story about debugging an Airflow DAG that was not starting tasks
01 Jun 2020
What is Kafka log compaction, and how does it work?
How the log compaction is implemented in Apache Kafka and how to configure it properly
22 May 2020
How does a Kafka Cluster work?
What is the difference between a leader and a replica broker? What is the cluster controller? How is the controller elected?
18 May 2020
Athena performance tips explained
How to use query execution plans to speed up Athena queries
11 May 2020
Data flow - what functional programming and Unix philosophy can teach us about data streaming
What does stream processing have in common with functional programming and Unix?
04 May 2020
AWS IAM roles and policies explained
In this article, I am going to explain the essential parts of IAM and describe how to grant permissions to your users or AWS Lambda functions you wrote.
06 Apr 2020
How to be happy at work - lessons learned from "Career superpowers" book
In this article, I share the lessons I learned from James Whittaker’s book “Career Superpowers: Succeeding on Purpose.”
30 Mar 2020