SNS -> Lambda = Immediate failures: It’s one of the more common ones, the common setups that we typically use, and this results in immediate failures. Handling by Event Source & Invocation Type So this is truly the danger of throttling using the default configuration. You can have scenarios where a high burst of traffic to one part of your application can have some cascading effects on other portions of your application. That means that a sudden burst of traffic to function one can start to result in throttling when new requests come in for function two and function three.Īnd this is the kind of problem with throttling. Function two is for another function three is for another. What we’re saying here is that the concurrency limit, the pool of concurrency is shared across all of your Lambda functions that are within the same account and within the same region. Any new invocation that exceeds that amount will get throttled and will receive that error. So at the very highest level here, if a new invocation comes in at this particular instant in time, that invocation will get throttled because that exceeds our 1000 unreserved account concurrency limit. So let’s assume that in response to this burst of requests at a particular instance of time, I have 1000 inflight requests or 1000 concurrent executions that are running against this function one. I get a sudden burst of traffic and I’m making hundreds. Now assume that at a particular instance a particular moment in time, I start calling this Lambda function one with a very high number of requests. But let’s just assume it’s some API that’s calling your Lambda function. Now say we have a client over here and this client could be some rest API that is acting on behalf of some user through a front end could be some other set up.
Now keep in mind that we have a default 1000 unreserved account concurrency limit. The only reason we have them in the same region, the same account is for convenience purposes. So function one may handle some part of an application.įunction two is for a separate application and function three, again, is for something separate. But in this example, let’s assume that these are all completely unrelated functions. Now, depending on your circumstance, you may have three separate functions, maybe only one. So in this region, I have function one, function two, and function three. And in our Lambda set up in this particular configuration, I have three functions in my region. They all have different behaviors when encountering throttling exceptions. But it does get a little bit more complicated in terms of how this rule applies when you have multiple Lambda functions in the same region and the same account.ĭepending on the invocation event source, whether it’s manual, SQS, SMS, Kinesis, Dynamo, or something else. What are the configure limits? Lambda has a default 1000 concurrency limit that’s specified per region within an account. So assume we’re at a particular instant in time if you have more invocations that are running that exceed your configured limit, all new requests to your Lambda function will get a throttling exception.
Now, just as a reminder, if this wasn’t clear, Lambda can handle multiple instance invocations at the same time and the sum of all of those invocations amounts to your concurrency execution count. Change Symantec Endpoint Protection Manager (SEPM) Communication Settings to Improve Performance
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