Last week, I was fortunate to attend Dave Beazley’s Rafting Trip course. The pretext of the course is to implement the Raft Consensus Algorithm. I’ll post more about Raft, and the journey of implementing, it later. But in brief, Raft is an algorithm that lets a cluster of machines work together to reliably do something. If you had a service that needed to stay up (and stay consistent), even if some of the machines in the cluster went down, then you might want to use Raft. ...
A few colleagues and I recently presented at the CIROH Training and Developers Conference. In preparation for that I created a Jupyter Book. You can view it at https://tomaugspurger.net/noaa-nwm/intro.html I created a few cloud-optimized versions for subsets of the data, but those will be going away since we don’t have operational pipelines to keep them up to date. But hopefully the static notebooks are still helpful. Lessons learned Aside from running out of time (I always prepare too much material for the amount of time), I think things went well. JupyterHub (perhaps + Dask) and Kubernetes continues to be a great way to run a workshop. ...
Over in Planetary Computer land, we’re working on bringing Sentinel-5P into our STAC catalog. STAC items require a geometry property, a GeoJSON object that describes the footprint of the assets. Thanks to the satellites’ orbit and the (spatial) size of the assets, we started with some…interesting… footprints: That initial footprint, shown in orange, would render the STAC collection essentially useless for spatial searches. The assets don’t actually cover (most of) the southern hemisphere. ...
Today, I was debugging a hanging task in Azure Batch. This short post records how I used py-spy to investigate the problem. Background Azure Batch is a compute service that we use to run container workloads. In this case, we start up a container that processes a bunch of GOES-GLM data to create STAC items for the Planetary Computer . The workflow is essentially a big for url in urls: local_file = download_url(url) stac.create_item(local_file) We noticed that some Azure Batch tasks were hanging. Based on our logs, we knew it was somewhere in that for loop, but couldn’t determine exactly where things were hanging. The goes-glm stactools package we used does read a NetCDF file, and my experience with Dask biased me towards thinking the netcdf library (or the HDF5 reader it uses) was hanging. But I wanted to confirm that before trying to implement a fix. ...
The Planetary Computer made its January 2023 release a couple weeks back. The flagship new feature is a really cool new ability to visualize the Microsoft AI-detected Buildings Footprints dataset. Here’s a little demo made by my teammate, Rob: Your browser doesn't support HTML video. Here is a link to the video instead. Currently, enabling this feature required converting the data from its native geoparquet to a lot of protobuf files with Tippecanoe. I’m very excited about projects to visualize the geoparquet data directly (see Kyle Barron’s demo) but for now we needed to do the conversion. ...
Over on the Planetary Computer team, we get to have a lot of fun discussions about doing geospatial data analysis on the cloud. This post summarizes some work we did, and the (I think) interesting conversations that came out of it. Background: GOES-GLM The instigator in this case was onboarding a new dataset to the Planetary Computer, GOES-GLM. GOES is a set of geostationary weather satellites operated by NOAA, and GLM is the Geostationary Lightning Mapper, an instrument on the satellites that’s used to monitor lightning. It produces some really neat (and valuable) data. ...
I came across a couple of new (to me) uses of queues recently. When I came up with the title to this article I knew I had to write them up together. Queues in Dask Over at the Coiled Blog, Gabe Joseph has a nice post summarizing a huge amount of effort addressing a problem that’s been vexing demanding Dask users for years. The main symptom of the problem was unexpectedly high memory usage on workers, leading to crashing workers (which in turn caused even more network communication, and so more memory usage, and more crashing workers). This is actually a problem I worked on a bit back in 2019, and I made very little progress. ...
It’s “Year in X” time, and here’s my 2022 Year in Books on GoodReads. I’ll cover some highlights here. Many of these recommendations came from the Incomparable’s Book Club, part of the main Incomparable podcast. In particular, episode 600 The Machine was a Vampire which is a roundup of their favorites from the 2010s. Bookended by Murderbot Diaries I started and ended this year (so far) with a couple installments in the Murderbot Diaries. These follow a robotic / organic “Security Unit” that’s responsible for taking care of humans in dangerous situations. We pick up after an unfortunate incident where it seems to have gone rouge and murdered her clients (hence, the murderbot) and hacked its governor module to essentially become “free”. ...
Mike Duncan is wrapping up his excellent Revolutions podcast. If you’re at all interested in history then now is a great time to pick it up. He takes the concept of “a revolution” and looks at it through the lens of a bunch of revolutions throughout history. The appendix episodes from the last few weeks have really tied things together, looking at whats common (and not) across all the revolutions covered in the series. ...
Like some others, I’m getting back into blogging. I’ll be “straying from my lane” and won’t just be writing about Python data libraries (though there will still be some of that). If you too would like to blog more, I’d encourge you to read Simon Willison’s What to blog About and Matt Rocklin’s Write Short Blogposts. Because I’m me, I couldn’t just make a new post. I also had to switch static site generators, just becauase. All the old links, including my RSS feed, should continue to work. If you spot any issues, let me know (I think I’ve fixed at least one bug in the RSS feed, apologies for any spurious updates. But just in case, you might want to update your RSS links to http://tomaugspurger.net/index.xml). ...