GitHub – FerretDB/FerretDB: A truly open-source MongoDB alternative

• FerretDB

  43 8,509 9.8 Go

  A truly Open Source MongoDB alternative

  

FerretDB co-founder there.

The order of fields is maintained by adding a special field with keys in the original order. For example, `{z: 1, a: {y:2, x:3}}` is stored as `{"a":{"x":3,"y":2,"$k":["y","x"]},"z":1,"$k":["z","a"]}`.

Additional types are stored as objects with special fields too. For example, binary values are stored as `{"$b": "", "s": }`. The full mapping is there: https://github.com/FerretDB/FerretDB/blob/b7e8240607e043a858...

• server

  3 113 10.0 Java

  ToroDB Server is an open source NoSQL database that runs on top of a RDBMS. Compatible with MongoDB protocol and APIs, but with support for native SQL, atomic operations and reliable and durable backends like PostgreSQL (by torodb)

  

This has been attempted before:

https://github.com/torodb/server

I emailed the project authors a while back and they said that unfortunately it had been abandoned. A shame. I hope the FerretDB people can pull it off.

• InfluxDB

  www.influxdata.com sponsored

  Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.

  

• service-tests

  1 37 0.0 Python

  Correctness test runner for MongoDB API endpoint and instructions for performance testing

  

The MongoDB test suite used to test compatibility is here:

https://github.com/mongodb-developer/service-tests

• badger

  30 13,367 6.7 Go

  Fast key-value DB in Go.

  

• mangodb

  20 874 0.0 Python

  A database that operates at CLOUD SCALE (by dcramer)

Hah, I wasn't taking FerretDB seriously because it mentioned it was previously MangoDB. I was only familiar with https://github.com/dcramer/mangodb.

• stampede

  1 1,768 10.0 Java

  The ToroDB solution to provide better analytics on top of MongoDB and make it easier to migrate from MongoDB to SQL

  

It was both. There were two separate software based on the same underlying technology:

* ToroDB Stampede[1]: MongoDB replica, converting on-the-fly documents to relational structures. Targeting OLAP, as data normalization made queries from some % faster to 2-3 orders of magnitude faster.

* ToroDB Server[2]: what DocumentDB is or FerretDB is planning to be. It was less developed than Stampede, certainly.

[1]: https://github.com/torodb/stampede/

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