SQS fifo trigger invoke Lambda Function (1 message - 1 invocation) - amazon-web-services

Question

I have a SQS FIFO queue triggering a Lambda function.
I sent 10 messages (all different) and the lambda was invoked just once.
Details:
SQS
Visibility timeout: 30 min
Delivery delay: 0 secs
Receive Message Wait Time: 0 secs
Lambda:
Batch size: 1
timeout: 3secs
I don't see any errors on Lambda invocations.
I don't want to touch the delivery delay, but if I increase, seems working.
The avg duration time is less than 1,5ms
Any ideas how I can achieve this?
Should I increase the delivery delay or time out?
The message is being sent from a ecs task with the following code:
from flask import Flask, request, redirect, url_for, send_from_directory, jsonify
app = Flask(__name__)
from werkzeug.utils import secure_filename
import os
import random
import boto3
s3 = boto3.client('s3')
sqs = boto3.client('sqs',region_name='eu-west-1')
#app.route('/', methods=['GET'])
def hello_world():
return 'Hello World!'
#app.route('/upload', methods=['POST'])
def upload():
print (str(random.randint(0,9)))
file = request.files['file']
if file:
filename = secure_filename(file.filename)
file.save(filename)
s3.upload_file(
Bucket = os.environ['bucket'],
Filename=filename,
Key = filename
)
resp = sqs.send_message(
QueueUrl=os.environ['queue'],
MessageBody=filename,
MessageGroupId=filename
)
return jsonify({
'msg': "OK"
})
else:
return jsonify({
'msg': "NOT OK"
})

Answer 1

Check if this helps:
The message deduplication ID is the token used for deduplication of sent messages. If a message with a particular message deduplication ID is sent successfully, any messages sent with the same message deduplication ID are accepted successfully but aren't delivered during the 5-minute deduplication interval.
https://docs.aws.amazon.com/AWSSimpleQueueService/latest/SQSDeveloperGuide/using-messagededuplicationid-property.html
At least it explains why it works when you increase delivery delay.