amazon web services - Lambda processing same SNS event multiple times? -


i have aws lambda function configured process sns events single topic. when function runs potentially send out other notifications , call context.succeed, or context.fail if error occurs. problem same sns event seems invoking lambda multiple times. looking @ cloudwatch logs see

start requestid: cd7afdf8-2816-11e6-bca2-6f2e3027c5e1 version: $latest

which ends

end requestid: cd7afdf8-2816-11e6-bca2-6f2e3027c5e1 report requestid: cd7afdf8-2816-11e6-bca2-6f2e3027c5e1 ...

immediately followed in same log start exact same requestid

start requestid: cd7afdf8-2816-11e6-bca2-6f2e3027c5e1 version: $latest

looking cloudwatch @ topic sending sns event seems publishing , delivering 1 had expected, seems lambda-side problem. know of reason event might triggering lambda multiple times this?

edit: i've noticed seems happening when lambda receives failure. don't see sort of retry configuration on lambda , wouldn't expect behaving way default.

from amazon lambda faqs page https://aws.amazon.com/lambda/faqs/

q: happens if lambda function fails during processing event?

on failure, lambda functions being invoked synchronously respond exception. lambda functions being invoked asynchronously retried @ least 3 times, after event may rejected. events amazon kinesis streams , amazon dynamodb streams retried until lambda function succeeds or data expires. kinesis , dynamodb streams retain data 24 hours.


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