#Does API function timeout if it’s triggered by multiple cron jobs?

14 messages · Page 1 of 1 (latest)

mental dragon
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I need to send a newsletter to 20k subscribers. Resend doesn’t yet support bulk email sending, so I want to build my own using Resend, Vercel Cron and Next.js API route.

I am not certain though, will a serverless function timeout if I keep triggering it via cron every second for like half an hour?

plain laurelBOT
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daring cairn
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Hey @mental dragon your function will time out in 10 or 60 seconds, depending on your plan

mental dragon
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Yes, but what if I call the same function multiple times, in few secs difference? Wouldn’t it try using the same warm lambda and timeout as a result?

daring cairn
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It will (most likely, but not 100% guaranteed) use the same warm lambda container.

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But it will be a brand new lambda function execution

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And will have the same rules as other lambdas. 10 or 60 seconds of runtime

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The only thing that may be shared between the lambdas (assuming the warm container was reused) is any variables in global scope

mental dragon
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Yeah, need to test that out. Want to try avoid using 3rd party tools if possible for now for background jobs.

daring cairn
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I totally understand

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Vercel doesn’t make this scenario easy

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You need some sort of locking mechanism

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If you’re planning on processing the emails concurrently

mental dragon
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Yeah… it’s nice they added cron jobs. But queueing system would be perfect. So I don’t need to trigger stupid amount of crons without knowing how long should I keep triggering.