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Day: January 18, 2024

Using Spark Connect from .NET

Published 2024-01-18 by Kevin Feasel

Ed Elliott keeps the hope alive:

Over the past couple of decades working in IT, I have found a particular interest in protocols. When I was learning how MSSQL worked, I spent a while figuring out how to read data from disk via backups rather than via the database server (MS Tape Format, if anyone cared). I spent more time than anyone should learning how to parse TDS (before the [MS-TDS] documentation was a thing)—having my head buried in a set of network traces and a pencil and pen has given me more pleasure than I can tell you.

This intersection of protocols and Spark piqued my interest in using Spark Connect to connect to Spark and run jobs from .NET rather than Python or Scala.

There’s a whole lot more ceremony involved than the Microsoft .NET for Apache Spark project, but read on to see how it all works. Also, I hereby officially chastise Ed for having examples in C# and VB.NET but not the greatest .NET language of them all: F#. Chastisement aside, I appreciate the work Ed put into this to bring Spark Connect to the .NET masses.

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Trying out Data Wrangler

Published 2024-01-18 by Kevin Feasel

Ginger Grant tries out a feature in Microsoft Fabric:

The second element in my series on new Fabric Features is Data Wrangler. Data Wrangler is an entirely new feature found inside of the Data Engineering and Machine Learning Experience of Fabric. It was created to help analyze data in a lakehouse using Spark and generated code. You may find that there’s a lot of data in the data lake that you need to evaluate to determine how you might incorporate the data into a data model. It’s important to examine the data to evaluate what the data contains. Is there anything missing? Incorrectly data typed? Bad Data? There is an easy method to discover what is missing with your data which uses some techniques commonly used by data scientists. Data Wrangler is used inside of notebooks in the Data Engineering or Machine Learning Environments, as the functionality does not exist within the Power BI experience.

Click through to see how it works. I liken it to Power Query for people who don’t like Python.

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The Problem with Automatic Plan Correction

Published 2024-01-18 by Kevin Feasel

Kendra Little lays it out:

I’ve written a bit about SQL Server’s Automatic Plan Correction feature before– I have an hour long free course with demos on Automatic Plan Correction here on the site.

Today I’m updating that course with a note: after using Automatic Plan Correction in anger for a good amount of time, I do not recommend enabling the feature. I’ve had it cause too many performance problems, and there are not a ton of options for an administrator when it’s causing those problems.

Kendra is still bullish about the potential of this but has some major issues with the current implementation. Read on to learn more about it.

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