防災放送をデジタル化してみた
約1ヶ月前に、屋久島に移住しました。屋久島の安房地方は、防災放送が結構回数が多くて、存在感があります（ 詳しくは、放送についてのブログを書いたので興味あれば読んでください）。たまに、重要な情報も流れます。ただ、聞き逃しや聞き違いとかあるので、移住前からでも、サイト化できないかと思って考え始めた。
実際に移住してからちょっと時間ができましたが、こんなの作れました。
2025 in Review
It’s that time of year again to reflect and think about what’s coming up in the future.
This year was an interesting year, both personally and professionally.
Personal
We’re approaching our fourth anniversary of moving to Yakushima (it’ll be exactly four years this coming February), and we’ve been able to make more friends and acquaintances on the island. I’ve also taken up running as a hobby and have gotten involved in the local running community as well.
Why I prefer Terraform over CloudFormation
I often get asked why I prefer Terraform over CloudFormation. I just ran into a nitpick of CloudFormation and decided to write this post before I forget about it.
So, I’m currently working on a relatively simple CloudFormation document that includes a CloudFront CDN that is in front of a S3 bucket. It also includes dependencies: the S3 bucket policy and the CloudFront Origin Access Identity. On my first try, I got something wrong in the CloudFront settings. OK, fine, I’ll fix it. It was a silly one-line mistake. Wait for cleanup to finish, removing the S3 bucket. Next, a mistake in the bucket policy. Another simple fix. This time the CloudFront distribution was already created, so I was already waiting for 3-5 minutes (I am so glad that it wasn’t 30 minutes like just a few years ago!). Wait for another 5-10 minutes for the distribution to be deleted and created again.
Creating Vector Tiles from Scratch using TypeScript
I currently work at a Japanese mapping startup called Geolonia. We specialize in customizing and displaying geospatial data, and a big part of this is making vector tiles. There are a lot of ways to do this, the most popular being tippecanoe from Mapbox, ST_AsMVT in PostGIS, OpenMapTiles, and tilemaker. We normally use tippecanoe to convert GeoJSON data to vector tiles and tilemaker to generate OpenStreetMap-based tiles, but there isn’t really an easy way to generate arbitrary vector tiles in plain old TypeScript / JavaScript.
My Desktop Environment
With the release of the Mac Studio recently – something that, for quite a long time, I thought I had been waiting for – I started thinking about what the ideal desktop environment for me is. This is what I use currently:
- A PC (i9-10900k with 32GB of RAM) running Ubuntu, hooked up to a 28-inch 4K monitor.
- A MacBook Air (M1, 2020 model)
I used to run macOS on the PC, but that experiment finished after a year or so. It was pretty stable and I had almost no problems, but hardware compatibility and performance was lacking. (Having a very Docker and Linux heavy workload meant that most of the time I was running Linux, virtualized in macOS, anyways, so I thought – hey, it would be better to just run Linux anyways, right?)
Serving real-time, tiled, point data directly from DynamoDB part 2 - the plan
I previously wrote about something I wanted to do with DynamoDB and geospatial data, and got a lot of responses on Twitter.
In the end, I think I’m going to go with a hybrid approach – using Uber’s H3 geocoding algorithm to generate clusters and to take care of indexing points, and then generating vector tiles as a separate process based on that data.
Here’s a bird’s-eye view of how the data will flow.
Serving real-time, tiled, point data directly from DynamoDB
Recently, I’ve been interested in how to serve and work with geographic data with the least amount of “work” possible. Everything here can be done pretty easily with PostGIS and a large enough server, but I’m always up for the challenge of doing things in a slightly different way.
I’m working on an app that will store lots of points around the world – points that people have submitted. Users will open this app, and be presented with a map with points that have been submitted in their vicinity. Once they zoom out, I want to show clusters of points to the users, with a number showing how many points are represented in that cluster.
Working with DynamoDB Global Tables
Just some stuff I’ve picked up while working with DynamoDB Global Tables. This was my first time using it; I used it to move a few tables from one region to another without downtime.
When deleting replica tables…
Note that this operation will delete the replica table and is non-reversible. This replica table cannot be re-added later to the global table.
This warning message is a little misleading – the replica table will be deleted, but it’s possible to re-create a new replica table in the region that was deleted.
For those times you don't want to eval...
I wanted to make some advanced logic available, easily configurable via a database, in a couple apps that I’ve been working on recently.
Honestly, I could have just stored the code in the database and eval’d it – but no, I don’t want to take the risk of arbitrarily executing code. I could have done some gymnastics like running it in a network-less container with defined inputs and outputs. I could have made the configuration more capable. What I decided to do in the end, though, was to write an extremely compact domain-specific language (DSL).
My Brief Thoughts on the AWS Kinesis Outage
There have been multiple analyses about the recent (2020/11/25) outage of AWS Kinesis and its cascading failure mode, taking a chunk of AWS services with it – including seemingly unrelated Cognito – due to dependencies hidden to the user. If you haven’t read the official postmortem statement by AWS yet, go read it now.
There are an infinite amount of arguments that can made about cascading failure; I’m not here to talk about that today. I’m here to talk about a time a few years ago I was evaluating a few systems to do event logging. Naturally, Kinesis was in consideration, and our team interviewed an AWS Solution Architect about potential design patterns we could implement, what problems they would solve, what hiccups we may encounter on the way, et cetera.
Venturing in to the realm of Hackintosh-ing
Like you, I’ve been finding myself working from home more often than not. These days, I probably go to an office once a month. I have a 16 inch MacBook Pro, but using it in clamshell mode, all the time, connected to a 4K monitor was… not ideal. It would often thermally throttle way down (often, it would be really sluggish – I wondered, how fast is this running? 800MHz. 90C. Fans at 100%.)
