What is it?
an A/B testing backend using AWS Lambda/API Gateway + Redis
- Highly scalable due to the nature of AWS Lambda
- High performance and low memory footprint using Redis HyperLogLog
- Cost Effective
- Easy deployment using
gimel deploy. No need to twiddle with AWS.
Looking for contributors
What does Gimel mean?
Gimel (גִּימֵל) is the 3rd letter of the Hebrew Alphabet. The letter (ג) also looks visually similar to the greek Lambda (λ).
Installation / Quick Start
You will need a live instance of redis accessible online from AWS. Then run:
$ pip install gimel $ gimel configure $ gimel deploy
It will automatically configure your AWS Lambda functions, API gateway and produce a JS snippet ready to use for tracking your experiments.
Alephbet might send duplicate events, but each event should include a
uuid to allow the backend to de-duplicate it. More below
Data Store - Redis HyperLogLog
The data store keeps a tally of each event that comes into the system. Being able to count unique events (de-duplication) was important to keep an accurate count. One approach would be to store each event in an entry / database row / document, and then run some kind of a unique count on it. Or we could use a nifty algorithm called HyperLogLog. HyperLogLog allows you to count unique counts without storing each and every item.
In terms of storage space, redis HyperLogLog offers a fixed size of 12k per counter. This gives us ample space for storing experiment data with low memory footprint.
Backend - AWS Lambda / API Gateway
The backend had to take care of a few simple types of requests:
- track an event - receive a (HTTP) request with some json data -- experiment name, variant, goal and uuid, and then push it to redis.
- extract the counters for a specific experiment, or all experiments into some json that can be presented on the dashboard.
New! access your dashboard with
How does tracking work?
Check out Alephbet.
gimel --help- prints a help screen.
gimel configure- opens your editor so you can edit the config.json file. Use it to update your redis settings.
gimel preflight- runs preflight checks to make sure you have access to AWS, redis etc.
gimel deploy- deploys the code and configs to AWS automatically.
Gimel is distributed under the MIT license. All 3rd party libraries and components are distributed under their respective license terms.
Copyright (C) 2016 Yoav Aner Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.