Author | Lightnews

David Behroozi @rootothez.bsky.social · 4d

I've started tagging my CDK projects so I can find them on disk when I inevitably need to upgrade the Lambda runtime.

David Behroozi @rootothez.bsky.social · 9d

They briefly mention the account based endpoints in the writeup: aws.amazon.com/message/1019... But my question remains, were those endpoints also impacted? Were the teams that couldn't get to dynamo not using the account based endpoints?

David Behroozi @rootothez.bsky.social · 9d

Ha! Something good came of the AWS incident Monday. I purchased a day pass to SlingTV to watch the Mariners play only to find I bought the wrong color (bought orange instead of blue which had the game). There aren't refunds on day passes, but due to the outage, they refunded me. I'll allow it!

David Behroozi @rootothez.bsky.social · 10d

More details on the account based endpoints that have been the default in some SDKs since last year: docs.aws.amazon.com/sdk-for-java...

Also, take this opportunity to make sure your runtime isn't caching DNS forever. Here is the TTL setting for java: docs.aws.amazon.com/sdk-for-java...

Use AWS account-based endpoints with DynamoDB - AWS SDK for JavaScript

DynamoDB offers AWS account-based endpoints that can improve performance by using your AWS account ID to streamline request routing.

docs.aws.amazon.com

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David Behroozi @rootothez.bsky.social · 10d

When the dust settles with the DynamoDB DNS issue, i'd be interested in understanding if it impacted the main DNS only: dynamodb.us-east-1.amazonaws.com or also the account id based DNS: .ddb.us-east-1.amazonaws.com? The account id DNS should have reduced the blast radius in theory.

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David Behroozi @rootothez.bsky.social · 11d

Totally!

David Behroozi @rootothez.bsky.social · 14d

One nice thing about cycling is the tool roadkill. This is the second pair of lock-jaw pliers I've found in the street.

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David Behroozi @rootothez.bsky.social · 15d

I've never seen a background guitar so comfortable.

David Behroozi @rootothez.bsky.social · 15d

I wrote about migrating my API from Node 22 to LLRT and the dragons I battled on the way.

speedrun.nobackspacecrew.com/blog/2025/10...

Migrating to LLRT - Speedrun

So long Node 22

speedrun.nobackspacecrew.com

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David Behroozi @rootothez.bsky.social · 16d

Heads up. If you attempt to sign up for the virtual pass using Firefox for Mac 144, when you select your Country of residence the modal closes without allowing you to sign up. It works in Chrome.

David Behroozi @rootothez.bsky.social · 20d

TBH I didn't do a comparison. There was an llrt sample that used it so I knew it had a good chance of working. In hindsight, these are the features I Iike about it
+ ESM
+ Middleware
+ Fast
+ Types
+ No dependencies
+ Small
+ Active

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David Behroozi @rootothez.bsky.social · 22d

This was more of a challenge to see what was possible. I could rewrite it in go or rust, but I'm also retired so learning either of those languages well isn't a priority.

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David Behroozi @rootothez.bsky.social · 22d

We did it fam. I successfully got my api working on LLRT. I had to switch to hono, drop jose, and modify some request parsing for form data, but IT WORKS! Seeing 188 ms Init Duration vs. 375 ms for Node 22. Warm requests with AWS service calls are like 60ms faster too.

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David Behroozi @rootothez.bsky.social · 26d

These aren't called spaces because tabs are better. This conversation is complete.

David Behroozi @rootothez.bsky.social · 29d

Can confirm, very good. Get there a little before 5pm or you're competing with everyone in Seattle for a taste.

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David Behroozi @rootothez.bsky.social · Sep 30

Lambda perf hasn't been working since September 15th: maxday.github.io/lambda-perf/

Lambda Cold Starts benchmark | maxday

Visualize 10 Cold Starts for each runtime, updated daily

maxday.github.io

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David Behroozi @rootothez.bsky.social · Sep 28

The color coordinated Red Bull must not have kicked in yet 😅

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David Behroozi @rootothez.bsky.social · Sep 27

Ordered! The best deal I found was straight from Packt: www.packtpub.com/en-us/produc...

Node.js Design Patterns | Web Development | Paperback

Level up your Node.js skills and design production-grade applications using proven techniques. 1 customer review. Top rated Web Development products.

www.packtpub.com

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David Behroozi @rootothez.bsky.social · Sep 22

It appears I was using `@initDuration+@billedDuration` and not `@initDuration + @duration` artificially inflating the baseline to 144ms from ~78ms. The delta between making a service call to STS from init vs. the handler is close to nothing when using llrt.

David Behroozi @rootothez.bsky.social · Sep 17

The next version of LLRT supports calling AWS services in init so you can utilize the extra CPU power. In testing, the initDuration+duration went from p50 of 144 ms to 76 ms! However, the E2E duration (from the client) stayed the same p50 of 268 ms vs p50 of 266 ms. This makes no sense to me.

David Behroozi @rootothez.bsky.social · Sep 22

Blitzing is one way to describe it. I captured this footage of me in the audience.

a black and white photo of a man crawling in the mud

ALT: a black and white photo of a man crawling in the mud

media.tenor.com

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David Behroozi @rootothez.bsky.social · Sep 20

@jason.energy was a multimodal mc at #cascadiajs He ranged from concert in the park pose to Carole Baskin leopard print. Good times!

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David Behroozi @rootothez.bsky.social · Sep 17

It's possible I built the pre-release version differently, and it's less optimized than a release build. I'm expecting to see the E2E time reduced by the same amount as the runtime savings.

David Behroozi @rootothez.bsky.social · Sep 17

The next version of LLRT supports calling AWS services in init so you can utilize the extra CPU power. In testing, the initDuration+duration went from p50 of 144 ms to 76 ms! However, the E2E duration (from the client) stayed the same p50 of 268 ms vs p50 of 266 ms. This makes no sense to me.

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David Behroozi @rootothez.bsky.social · Sep 16

My garbage disposal kept failing due to low voltage at the switch (36 volts instead of 120). Today after it failed for the third time and my normal voodoo didn't work, I bought a new switch. The culprit was smoked sugar ants in the contact.

David Behroozi @rootothez.bsky.social · Sep 12

I think the future is something more like cloudfront functions (i.e. cut out lambda entirely). But for critical path, cross domain use cases like api gateway authorizers, using a faster lambda runtime makes sense now. Ben Pyle has written about this use case for rust: binaryheap.com/cognito-star...

Cognito Starter Kit with Rust and Lambda » A Pyle of Stories

Cognito is a powerful AWS managed service which can be further extended. In this article I walk through a Cognito Starter Kit with Rust and Lambda.

binaryheap.com

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