Serverless

Finding coldstarts : how long does AWS Lambda keep your idle functions around?

AWS, Lambda, Programming, Serverless

In the last post I compared the coldstart time for Lambda functions with different language, memory and code size. One of the things I learnt was that idle functions are no longer terminated after 5 minutes of inactivity. /2017/06/aws-lambda-compare-coldstart-time-with-different-languages-memory-and-code-sizes/ It is a fantastic news and something that Amazon has quietly changed behind the scene. However, …

Finding coldstarts : how long does AWS Lambda keep your idle functions around? Read More »

aws lambda – compare coldstart time with different languages, memory and code sizes

AWS, Lambda, Programming, Serverless

A while back we looked at the performance difference between the language runtimes AWS Lambda supports natively. We intentionally omitted coldstart time from that experiment as we were interested in performance differences when a function is “warm”. However, coldstart is still an important performance consideration, so let’s take a closer look with some experiments designed …

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Serverless 1.X – enable API Gateway caching on request parameters

API Gateway, AWS, Lambda, Programming, Serverless

Having previously blogged about the untrodden path to enable caching on API Gateway request parameters in the Serverless framework 0.5.X, it’s a little disappointing that it’s still not officially fixed in the 1.X versions… The Problem The problem is two-fold: there’s currently no way to specify caching should be enabled for path & query string …

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Yubl’s road to Serverless architecture – building a scalable push notification system

AWS, Lambda, Programming, S3, Serverless

part 1: overview part 2: testing and CI/CD part 3: ops part 4: building a scalable notification system <- you’re here part 5: building a better recommendation system Just before Yubl’s untimely demise we did an interesting piece of work to redesign the system for sending targeted push notifications to our users to improve retention. The …

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AWS Lambda – build yourself a URL shortener in 2 hours

API Gateway, AWS, DynamoDB, Lambda, Programming, Serverless

An interesting requirement came up at work this week where we discussed potentially having to run our own URL Shortener because the Universal Links mechanism (in iOS 9 and above) requires a JSON manifest at https://domain.com/apple-app-site-association Since the OS doesn’t follow redirects this manifest has to be hosted on the URL shortener’s root domain. Owing to a limitation on AppsFlyer it’s …

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Yubl’s road to Serverless architecture – Testing and CI/CD

API Gateway, AWS, Kinesis, Lambda, Node.js, Programming, Serverless

part 1: overview part 2: testing and CI/CD <- you’re here part 3: ops part 4: building a scalable notification system part 5: building a better recommendation system Having spoken to quite a few people about using AWS Lambda in production, testing and CI/CD are always high up the list of questions, so I’d like to use …

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