AWS Lambda TooManyRequestsException: Rate Exceeded
Answer : As noted by Michael , this is the error message you will see when you reach the documented default " safety " limit of 100 concurrent invocations : " AWS Lambda has a default safety throttle of 100 concurrent executions per account per region. If you wish to submit a request to increase the throttle of 100 concurrent executions you can visit our Support Center ..." The solution was to open a support ticket providing the following info: Limit increase request 1 Service: Lambda Region: EU (Ireland) Limit name: concurrent requests (average duration * average TPS) New limit value: 2000 And then in the body of the ticket/request try to estimate your usage pattern: Expected average requests per second: 200 Expected peak requests per second: 2000 Expected function duration: 2 seconds Function memory size: 1000mb Invocation Type: Request-response Event Source: Api Gateway & Lambda<->Lambda It can take a while to get a res...