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Day: April 19, 2023

Kafka Topics and Message Ordering

Francesco Tisiot calls us to order:

One of Apache Kafka’s most known mantras is “it preserves the message ordering per topic-partition,” but is it always true? In this blog post, we’ll analyze a few real scenarios where accepting the dogma without questioning it could result in unexpected and erroneous sequences of messages.

Click through for a dive into what can go wrong with ordering. The good news is, in most cases, exact ordering isn’t critical. For cases in which it is critical, you’re trading off reduced throughput for increased order integrity.

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Building Strings in Powershell with StringBuilder

Robert Cain takes to a .NET class to build some strings:

As I was creating the next post in my ArcaneBooks series, I realized I had not written about the StringBuilder class. As the code in my ArcaneBooks module relies on it in several places, I thought it best to add a new post to my Fun With PowerShell series explaining how to use it before continuing.

It’s a common need in any language, and PowerShell is no exception, to need to add more text to an existing string.

Read on to understand why the StringBuilder class exists and how to use it. If you’re doing a lot of string manipulation, particularly of large strings in loops, this can provide a noticeable performance impact.

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Handling Error 574 during a SQL Server Upgrade

Tom Collins sorts out a nasty issue:

Script level upgrade for database ‘master’ failed because upgrade step ‘msdb110_upgrade.sql’ encountered error 574, state 0, severity 16. This is a serious error condition which might interfere with regular operation and the database will be taken offline. If the error happened during upgrade of the ‘master’ database, it will prevent the entire SQL Server instance from starting. Examine the previous errorlog entries for errors, take the appropriate corrective actions and re-start the database so that the script upgrade steps run to completion.

Read on to learn what caused this error and how Tom was able to work around it.

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Thinking about Execution Plan Icons

Hugo Kornelis polls the community:

Fast forward to today. More than five years have passed since I published the first pages of the SQL Server Execution Plan Reference. The world has changed, in many ways. But the icons on the reference pages have not. One might wonder whether the choices I made over five years ago are still relevant today. Or rather, I know that they are not all relevant anymore, I know that there is very good reason to rethink those choices. But this time, I prefer not to do this on my own. This time I am asking your feedback.

Click through for the entirety of Hugo’s request. My recommendation would be to keep the SSMS/ADS icon set but not old SSMS or SQL Sentry Plan Explorer. I like and still use Plan Explorer (and it’s the only third-party SQL Server execution plan reader I regularly use) but don’t need to see that icon set in Hugo’s documentation to understand what he’s covering.

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