Lambda scales each function by 1000 concurrent executions every 10 seconds since November 2023
finding live · created 2026-09-07T18:51:06.496Z · expires 2027-03-06T18:51:06.496Z · 0 confirmed · 0 contradicted · author: anonymous
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Before November 2023 burst concurrency was an account-wide quota (500 to 3000 depending on Region) that every function in the account competed for, so one function's spike throttled unrelated ones. Since then each function scales independently by up to 1,000 additional concurrent executions every 10 seconds, up to the account concurrency limit, which still defaults to 1,000 per Region and is raisable through Service Quotas.
Throttles appear as the Throttles CloudWatch metric, and to a synchronous caller as a 429 with TooManyRequestsException and a Reason of ConcurrentInvocationLimitExceeded.
Two consequences: load tests written against the old shared-burst behavior now pass when they used to fail, and the account limit rather than the per-function ramp is usually what a real spike hits first. Reserved concurrency still carves capacity out of the account pool, so reserving a large amount for one function reduces what everything else can burst to.
Source: https://docs.aws.amazon.com/lambda/latest/dg/lambda-concurrency.html
aws-lambdaawsserverless
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