Aivars Kalvāns articles - 46 total
Transactional task outbox in Django with django-taskq
We have given up on distributed transactions (2PC) but have not given up working with multiple...
A Philosophy of Software Design
In a world full of Uncles Bob be John Ousterhout More of method length, comment and TDD discussion...
Serializable isolation level and transaction processing
While on the topic of On-Line Transaction Processing Benchmarks, it’s interesting to observe the...
A broker-less distributed messaging system from the previous century
When examining the On-Line Transaction Processing Benchmark, most people focus on the performance...
My Friday's "old man yells at cloud" moment
Casey Muratori had this to say: You should never take library design advice from anyone who hasn’t...
Python JSON encoder apples and oranges and making it faster
There are several JSON library benchmarks like this one where the built-in Python json library is not...
Ledgers are simple, stop spreading FUD!
When you do need thousands and tens of thousands of transactions per second, TigerBeetle is there for...
Making sense of card range query EXPLAIN plans
I was listening to a talk about finding a PAN in a haystack and this slide came up with performance...
The COST of double-entry accounting
Sometimes I think the most important paper of our times is Scalability! But at what COST?We build...
bpftrace username and the openat system call
Once again I am playing with eBPF and bpftrace. This time I am trying to trace all file access....
The O of SOLID
Wikipedia says that O stands for: | Open–closed principle: “Software entities … should be open for...
The S of SOLID
So many people throw SOLID around as the unquestionable truth that I decided to dig a bit deeper and...
Listing SystemV IPC queues
The correct way to list the queues on the Linux machine is by using the ipcs -q command. However, I...
Monitoring Oracle Tuxedo with Linux eBPF
I have built several scripts for monitoring Oracle Tuxedo over the years. Most relied on the tmtrace...
Optimizing Python application's Docker image with strip
I was going through some Docker images of large applications and looking at the layer sizes with...
Accounting systems before TigerBeetle
TigerBeetle is an interesting project to follow. It links to interesting papers, it challenges...
Today I Learned... WTF, Kafka?
I was reading about offset retention and was mentally prepared for losing consumer offsets when the...
Running your pytests faster
Open your conftest.py and type the following lines: import gc # Like gc.disable() but overrides...
How I made `json.dumps` ~20% faster
My journey to understand the performance and concurrency of FastAPI services lead me to the Python...
FastAPI and cooperative multi-threading pt. 2
After finding a good enough solution for FastAPI and cooperative multi-threading issues, a part of me...
Idle HTTP connections in Scala on Kubernetes
Both the HTTP client (Scala) and HTTP server (Python) are running in Kubernetes. Depending on the...
FastAPI and cooperative multi-threading
Cal Paterson wrote a great article comparing and describing synchronous and asynchronous Python...
Optimizing Kafka producers for latency
TL;DR Don’t forget to set socket.nagle.disable=True to disable Nagle’s algorithm The code I am...
Inspecting Python functions
I have a piece of C++ code that calls user-defined functions implemented in Python. Instead of...
The hitchhiker's guide to the tpcall flags
Oracle Tuxedo documentation of the tpcall function describes (mostly) the high-level behavior of the...
Tracing msgrcv with ltrace
ltrace is a tool for tracing dynamic library calls. I use it from time to time and this time I needed...
Fchg32 is the Swiss Army knife of Tuxedo FML32
FML32 is Oracle Tuxedo buffer type similar to std::multimap in C++ or multidict in Python where the...
Debugging Boolean Expressions of Fielded Buffers
I described the SIGFPE bomb of Boolean Expressions before. Going through the list of the C functions...
Making sense of Tuxedo's SCANUNIT, SANITYSCAN, and BLOCKTIME
Time accounting is strange in Oracle Tuxedo. First, there is the SCANUNIT parameter which must be a...
Oracle Tuxedo MSSQ vs. SSSQ
Servers in Oracle Tuxedo can be configured either in Multiple Servers - Single Queue (MSSQ) setup or...