Yan Cui's blog articles

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on 6/21/2017 1:00 AM
Tweet 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. AWS Lambda – compare coldstart time with different languages, memory and code sizes It is a fantastic
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on 6/13/2017 1:00 AM
Tweet A while back we looked at the performance difference between the language runtimes AWS Lambda supports natively. AWS Lambda – comparing platform performances 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
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on 5/22/2017 1:00 AM
Tweet TL;DR – The no. of partitions in a DynamoDB table goes up in response to increased load or storage size, but it never come back down, ever. DynamoDB is pretty great, but as I have seen this particular problem at 3 different companies – Gamesys, JUST EAT, and now Space Ape Games – I think
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on 5/8/2017 1:00 AM
Tweet 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
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on 5/2/2017 1:00 AM
Tweet The Road So Far part 1 : overview part 2 : testing and continuous delivery strategies part 3 : ops   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 old system relied on MixPanel for both selecting users as
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