Update 15/03/2019: Thanks to Zac Charles who pointed me to this new page in the DynamoDB docs. It explains how the OnDemand capacity mode works. Turns out you DON’T need to pre-warm a table. You just need to create the table with the desired peak throughput (Provisioned), and then change it to OnDemand. After you change the table to OnDemand …
Understanding the scaling behaviour of DynamoDB OnDemand tables Read More »
CloudWatch Events let you easily create cron jobs with Lambda. However, it’s not designed for running lots of ad-hoc tasks, each to be executed once, at a specific time. The default limit on CloudWatch Events is a lowly 100 rules per region per account. It’s a soft limit, so it’s possible to request a limit …
I recently watched an excellent talk by Matt Lavin on optimization tips for Lambda and saw a slide on making DynamoDB use HTTP keep-alive. It reminded me of a conversation I had with Sebastian Cohnen, so I set out to test the effect this simple optimization has. What is it all about? As it turns …
Lambda optimization tip – enable HTTP keep-alive Read More »
A use case happened at work recently, where we need to subscribe a SQS queue to a SNS topic running in another AWS account. On the surface this seems like something many people would need to do, and indeed I was able to find an official tutorial pretty quickly. But the tutorial is all “click …
Subscribe SQS to a SNS topic in another AWS account with CloudFormation Read More »
As we approach the completion of my video course Production-Ready Serverless, I have also delivered the course in a classroom setting with both SimplyBusiness and the DVLA in the UK. In the coming months, I will also be running public workshops at various conferences and user groups: AWS User Group 17th Oct @ The Telegraph, London (sold …
Production-Ready Serverless is coming to a workshop near you! Read More »
In my last post we talked about how we can implement semaphores with Step Functions. Another common scenario that many people have is to handle errors from a block of states like we’re used to with a try-catch block. try { step1() step2() step3() } catch (States.Timeout) { … } catch (States.ALL) { … } …
Step Functions : apply try-catch to a block of states Read More »
If you haven’t been paying close attention you might have missed the API Gateway announcement for resource policies. It later played a key role in supporting API Gateway private endpoints – a way to put your API inside a private VPC. To configure resource policies with the Serverless framework, you need to upgrade to v1.28.0 or …
How to create IP-protected endpoints with API Gateway and Lambda Read More »
First of all, I would like to thank all of you for following and reading my content. My post on centralised logging for AWS Lambda has been viewed more than 20K times by now, so it is clearly a challenge that many of you have run into. In the post, I outlined an approach of …
Centralised logging for AWS Lambda, REVISED (2018) Read More »
Here at DAZN, we are migrating from our legacy platform into a brave new world of microfrontends and microservices. Along the way, we also discovered the delights that AWS Step Function has to offer, for example… flexible error handling and retry the understated ability to wait between tasks the ability to mix automated steps with …
Step Functions: how to implement semaphores for state machines Read More »
Hello, just a quick note to tell you that recording of my talk at the recent AWS User Group meetup is now live! In this talk, I introduced the core concepts of chaos engineering, and the challenges that the Serverless paradigm brings to the existing tools and practices we use. I then looked at techniques …
Video and slides for my talk “applying principles of chaos engineering to Serverless” Read More »
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