AWS Lambda Function Execution and Cold Start
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- Опубликовано: 21 июн 2022
- In this video, we learn about the anatomy of a Lambda Function execution and how it can create a phenomenon called "cold start". We talk about the four key steps of a Lambda function execution: Code Download, Execution Environment, Initialization, and Execution.
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Hi, thank you for great video. Could you please explain how to detect cold start of function? Has AWS console any metrics for that?
If we set provision concurrency as 4 what is that means ???? Will warm start happen only 4 time and then after 4 execution will be cold start again ?
I would've preferred naming them as Cold Start, Lukewarm Start. Warm Start.
Good way of thinking about it :D
Sorry if this question is too naive but I had to ask it.
Regarding the 4 steps mentioned above, does AWS charge us for all of them or only the 4th one?
I was working quite extensively on lambdas last year and my mentor told me to initialize the connection to the DB outside the handler function such that we could use the benefits of warm connection as well as not pay for the extra `ms` for this step 4.
It would be awesome if you can cover this in a small video?
Thank you.
So if you initialize your DB connection inside handler then it is run on each request, so for 100 requests in a second it's 100 initializations!. On the other hand if you moved the DB initialization outside the handler it would be part of step 3 (Execute init code). This means that your connection is already initialized. We do save extra 'ms' by doing this because, say your DB initialization takes 10 ms, then this is 10 ms saved for each request.
@@nagarjunprasad Thank you. This makes sense. I would like to add a small question here. :) So if the DB is initialized in step 3, does AWS charge us for it? For example: If step 3 takes 10ms and step 4 takes 40ms. Does AWS charge us for 10 + 40 ms? or only 40ms?
@@pemessh curios to know if you were able to move DB connection to step 3. Did it save execution time and cost?
Please make tutorial how to implement long running Lambda function and overcome 29s HTTP request timeout via API Gateway.
If you are looking at using Java in Lambda then "Best practices for AWS Lambda and Java" from re:Invent 2019 (ruclips.net/video/ddg1u5HLwg8/видео.html) is worth a look. One interesting thing it says is that there can be more CPU available during the initialisation phase than the what the handler gets, which is based on the RAM, and the talk shows how you can make use of this in reducing cold start time. I am not aware of any other direct reference to this, or even whether it still holds true.
Thanks so much for the great reference Tim!
I really like your course Daniel , but I think it would be better doing it in TS
Thanks for the suggestion Abdou. I'll consider this for y upcoming one.
All the examples are in TS. So it is better to use other languages!