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This is the sixteenth part of the .NET Inside Out series. For your convenience you can find other parts in the table of contents in Part 1 – Virtual and non-virtual calls in C# Today we are going to play with type system to see if we can break it. Let’s take this code: We … Continue reading .NET Inside Out Part 16 — Abusing type system
I was working with seemingly simple load job in Redshift. I was generating some data and wanted to store the output in separate table, just to persist it for debugging purposes. However, since the job could be reran if needed, I wanted to remove rows generated previously and add new ones. So I tried the … Continue reading Aborted transactions in Redshift due to Serializable isolation level
This is a short story of fixing Tomcat in an EMR cluster. There is a CVE about Tomcat 8 hole. I’m using EMR 5.12.2. Let’s try installing CVE patch as a bootstrap action with It should fix the mentioned hole but after bringing up the new cluster and running we can see that it installs … Continue reading Updating Tomcat in an EMR cluster
This is the fourth part of the JVM Inside Out series. For your convenience you can find other parts in the table of contents in Part 1 — Getting object address Typical locking pattern in Java (and other languages, even outside them JVM ecosystem) looks like this: Simple enough, nothing should break here. However, there … Continue reading JVM Inside Out Part 4 — Locks and out of band exceptions
This is the second part of the JVM Inside Out series. For your convenience you can find other parts in the table of contents in Part 1 — Getting object address Last time we saw how to read object address. We can use similar trick to read object contents as integers. Let’s see this: First, … Continue reading JVM Inside Out Part 2 — Reading object content