simple-fass-manager

Implement a simple auto scale mechanism

Architecture

Environment variables

Project environment variable are found here .env

POLLING_INTERVAL_MS=10    // message queue polling interval
POLLING_BATCH_SIZE=10     // message queue polling batch size
FREEZE_STATE_MS=1000      // child process freeze ("warm") state in milliseconds
PORT=8000                 // server port     
FILE_NAME=shared-file.txt // name of the shared file
MAX_RETRY_ATTEMPTS=20     // maximum retry attempts in case of process failure
SHOW_LOGS=true            // show logs flag

Assumptions

1. Function Asynchronous invocation
2. An active instance is an instance currently running (not in a warm state)
3. Total invocations does not count retries, only successful finish functions

Usage

Install project dependencies

npm i

Start project

npm start

Push a message

curl --header "Content-Type: application/json" --request POST --data '{"message":"I'm a message"}' http://localhost:8000/messages

Get statistics

curl http://localhost:8000/statistics

Test

Install loadtest globally

npm i -g loadtest

Run loadtest

Sanity

loadtest -n 120 -c 1  -T 'application/json' --data '{"message":"My My, Hey Hey"}' -m POST --rps 1  http://localhost:8000/messages

Load test

loadtest -n 2000 -c 50  -T 'application/json' --data '{"message":"My My, Hey Hey"}' -m POST --rps 50  http://localhost:8000/messages