Topic

Lambda concurrency limits

AWS Lambda's rules for how many function instances may run at once, covering the per-Region account pool, per-function reserved concurrency and the scaling rates applied to event source mappings.

Current clusters

build1 publisher

One SQS consumer can empty a default Lambda concurrency pool in under four minutes

A standard SQS event source mapping climbs toward 1,250 concurrent instances while the default account pool holds 1,000. The setting that would cap it sits on function configuration, at one API call per function to read.

Publishers:dev.to

Reality

Evidence45
Adoption12
Hype gap−10
Incentives55
Confidence55