How to invoke AWS lambda function from another lambda function and return without waitng for the called lambda result

Question

I am having two AWS lambda java 8 function "lambda A" and "lambda B". "lambda A" function invokes "lambda B" function and waits till it gets the result of "lambda B". But I want to invoke the "lambda B" and return the "lambda A" function immediately. Is it possible to implement and any reference links related to it.

s.hesse · Accepted Answer · 2017-11-17 12:39:41Z

2

With the AWS Lambda SDK for Java you can set the InvocationType within the InvokeRequest object. This will just invoke your function, but won't wait for a response.

From the Javadocs:

By default, the Invoke API assumes RequestResponse invocation type. You can optionally request asynchronous execution by specifying Event as the InvocationType.

Example:

AWSLambda lambdaClient = AWSLambdaClientBuilder.defaultClient();
InvokeRequest request = new InvokeRequest();
request.withFunctionName(name)
       .withInvocationType(InvocationType.Event)
       .withPayload(payload);
InvokeResult result = lambdaClient.invoke(request);

Please also consider reading this and this question.

answered Nov 17, 2017 at 12:39

s.hesse

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2 Comments

Soorya Prakash Over a year ago

Thanks for the clarification. Can you please also clarify me, if I write the "return" next to invoke line. Will it call successfully the lambda B function and also return executes immediately without waiting for the invoke result.

s.hesse Over a year ago

I assume you mean something like this: InvokeResult result = lambdaClient.invoke(request); return ...; ? This will just invoke your function, you'll get a response that it's invoked and you can return whatever you want. See also here

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