Feature request: Disable automatic retries for lambda invoke

tldr

When calling client.invoke for lambda functions, I want to disable automatic retries upon timeout.

Steps to reproduce:

import boto3
import json
client = boto3.client('lambda')
response = client.invoke(
    InvocationType='RequestResponse',
    FunctionName='my_lambda',
    LogType='Tail',
    Payload=json.dumps({})
)

Where my_lambda is configured to timeout after 100 seconds, but the code itself requires more time than that.

Desired behaviour

For my particular case, I want client.invoke to return in no more than 100 seconds. If the function requires more than that, client.invoke should raise a botocore.vendored.requests.exceptions.ReadTimeout exception after 100 seconds (or maybe 101 seconds if you factor in overhead).

Observed Behaviour

client.invoke raises the exception botocore.vendored.requests.exceptions.ReadTimeout after 626 seconds. The CloudWatch logs show that the lambda function was invoked 8 times, even though client.invoke was only called once.

(Yes, I know that (8-1) * 100 > 626. I’m confused by that too)

Justification

For this particular case, I know with certainty that if the lambda timed out the first time, it will time out the next 5 times also. So there’s no point retrying. I understand that normally automatic retries may be handy. So I propose that an option is added to client.invoke, which allows you to disable automatic retries.

[ryantuck]

Looks like this was fixed with a cleaner solution in boto/botocore#1260:

import boto3
import botocore.config

cfg = botocore.config.Config(retries={'max_attempts': 0})
client = boto3.client('lambda', config=cfg)

[tnpxu]

this is my workaround about this issue

config = botocore.config.Config(connect_timeout=300, read_timeout=300)
client = boto3.client('lambda', region_name='us-east-1', config=config)
....
....
# set retry config for lambda = 0
client.meta.events._unique_id_handlers['retry-config-lambda']['handler']._checker.__dict__['_max_attempts'] = 0
....
....
response = client.invoke(
                    FunctionName='',
                    InvocationType='',
                    LogType='',
                    Payload=''
                )