Julien Danjou

Mergify

More GitHub workflow automation

The more you use computers, the more you see the potentials for automating everything. Who doesn't love that? By building Mergify [https://mergify.io] those last months, we've decided it was time bring more automation to the development workflow. Mergify's first version was a minimal viable product around automating the

Python

Code Style Checks in Python

After starting your first Python project [https://julien.danjou.info/starting-your-first-python-project/], you might realize that it is actually not that obvious to be consistent with the way you write Python code. If you collaborate with other developers, your code style might differ, and the code can become somehow unreadable. I

Python

High-Performance in Python with Zero-Copy and the Buffer Protocol

Whatever your programs are doing, they often have to deal with vast amounts of data. This data is usually represented and manipulated in the form of strings. However, handling such a large quantity of input in strings can be very ineffective once you start manipulating them by copying, slicing, and

Gnocchi 4.3.0 released

This new release minor release of Gnocchi has been a bit longer than usual, but here it is! So what's new in this version of Gnocchi? Well, according to the release notes [https://gnocchi.xyz/releasenotes/4.3.html], not much. There are only two new features: * gnocchi-injector which allows

Python

Starting your first Python project

There's a gap between learning the syntax of the Python programming language and being able to build a project from scratch. When you finish reading your first tutorial or book about Python, you're good to go for writing a Fibonacci suite calculator, but that does not help you starting your

Mergify

How I stopped merging broken code

It's been a while since I moved all my projects to GitHub [https://github.com]. It's convenient to host Git projects, and the collaboration workflow is smooth. I love pull requests to merge code. I review them, I send them, I merge them. The fact that you can plug them

Mergify Featured

Stop merging your pull requests manually

If there's something that I hate, it's doing things manually when I know I could automate them. Am I alone in this situation? I doubt so. Nevertheless, every day, they are thousands of developers using GitHub [https://github.com] that are doing the same thing over and over again: they

Python

A simple filtering syntax tree in Python

Working on various pieces of software those last years, I noticed that there's always a feature that requires implementing some DSL. The problem with DSL is that it is never the road that you want to go. I remember how creating my first DSL was fascinating: after using programming languages

Python

Correct HTTP scheme in WSGI with Cloudflare

I've recently been using Cloudflare [https://cloudflare.com] as an HTTP frontend for some applications, and getting things working correctly with WSGI was unobvious. In Python, WSGI [https://en.wikipedia.org/wiki/Web_Server_Gateway_Interface] is the standard protocol to write a Web application. All Web frameworks that I

OpenStack

Lessons from OpenStack Telemetry: Deflation

This post is the second and final episode of Lessons from OpenStack Telemetry. If you have missed the first post, you can read it here [https://julien.danjou.info/lessons-from-openstack-telemetry-incubation/]. Splitting At some point, the rules relaxed on new projects addition with the Big Tent initiative, allowing us to rename

OpenStack

Lessons from OpenStack Telemetry: Incubation

It was mostly around that time in 2012 that I and a couple of fellow open-source enthusiasts started working on Ceilometer, the first piece of software from the OpenStack Telemetry project. Six years have passed since then. I've been thinking about this blog post for several months (even years, maybe)

Python

Is Python a Good Choice for Entreprise Projects?

A few weeks ago, one of my followers, Morteza, reached out and asked me the following: > I develop projects mostly with Python, but I am scared that Python is not a good choice for enterprise projects. In many cases, I've encountered a situation where Python performance was not sufficient, like

Gnocchi

Gnocchi engine optimization

Software speed is relative. After all, it is the result of a set of trade-offs made between the ease of programming and the speed of hardware. The comfort of the developer and its use of multiple abstraction layers has a direct impact on decreasing the cost in time (and therefore

Ghost

On blog migration

I've started my first Web page in 1998 and one could say that it evolved quite a bit in the meantime. From a Frontpage designed Web site with frames, it evolved to plain HTML files. I've started blogging in 2003, though the archives of this blog only gets back to

Python

Scaling a polling Python application with tooz

This article is the final one of the series I wrote about scaling a large number of connections in a Python application. If you don't remember what the problem we're trying to solve is, here it is, coming from one of my followers: > It so happened that I'm currently working

Python

Scaling a polling Python application with asyncio

This article is a follow-up of my previous blog post about scaling a large number of connections [https://julien.danjou.info/scaling-python-application-threads]. If you don't remember, I was trying to solve one of my followers' problem: > It so happened that I'm currently working on scaling some Python app. Specifically, now

Gnocchi

Gnocchi 4.2 release

The time of the release arrived. A little more than three months have passed since the latest minor version, 4.1, has been released. There are tons of improvement and a few nice significant features in this release! Most of the principal changes are recorded in the 4.2 release

Python

Scaling a polling Python application with parallelism

A few weeks ago, Alon contacted me and asked me the following: > It so happened that I'm currently working on scaling some Python app. Specifically, now I'm trying to figure out the best way to scale SSH connections - when one server has to connect to thousands (or even tens

Pastamaker

A safe GitHub workflow with Pastamaker

When the Gnocchi [https://gnocchi.xyz] project decided to move to GitHub [https://github.com], we developers had to move from a Gerrit based workflow to a GitHub pull-request one. This has been challenging in some ways. We were satisfied with the workflow we had using Gerrit and Zuul [https:

Books

Scaling Python released

I am proud to announce today the immediate release of Scaling Python [https://scaling-python.com], my second book about Python! It talks about the distribution and performance of applications written in Python, and how to build them properly! It took me a year to build this entirely new product around

Books

Scaling Python: the interviewees

The release date for Scaling Python [http://scaling-python.com] is now very close! Today, I'd like to talk a bit about the interviews that I've run those last months that are featured in the book. I'm glad that during those long weeks work, I have managed to find a Python

Books

Mastering PostgreSQL

A few months ago, my friend Dimitri Fontaine [http://tapoueh.org] and I discussed writing books and sharing our knowledge. If you do not know Dimitri yet, he is an old-time PostgreSQL Major Contributor – meaning he writes code for the PostgreSQL software itself! I interviewed Dimitri a few years ago

Gnocchi

Gnocchi 4.1 is out

We did it again. A bit more of our usual four months were needed to do it, but Gnocchi 4.1 has been released. This is a great news and another big milestone for the project! As usual, we enhanced Gnocchi and added a bunch of new things that can

Interview

My interview with Cool Python Codes

A few days ago, I've recently been contacted by Godson Rapture from Cool Python codes [http://coolpythoncodes.com/] to answer a few questions about what I work on in open source. Godson regularly interview developers and I invite you to check out his website! Here's a copy of my original

Gnocchi

Gnocchi 4 performance

It has been a long time since I have tested Gnocchi [http://gnocchi.xyz] performances. Last time was two years ago, on version 2 [https://julien.danjou.info/blog/2015/gnocchi-benchmarks]. The current version for Gnocchi is 4.0, released a couple of months ago [https://julien.danjou.info/blog/