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FerretDB and DocumentDB seem to be the only other two Mongo-compatible open source database implementations. Both are based on PostgreSQL.
by the_precipitate 1y ago
FerretDB and DocumentDB seem to be the only other two Mongo-compatible open source database implementations. Both are based on PostgreSQL.
- iamlintaoz 1y agoThat’s correct. FerretDB and DocumentDB both pursue PostgreSQL-based document models. EloqDoc follows a fundamentally different architectural path. Instead of executing in Postgres, we leverage the existing MongoDB parser and executor to ensure maximum compatibility. Our main contribution is to replace the single-writer WiredTiger storage engine entirely with Data Substrate. The Data Substrate is an abstract layer built specifically to handle distributed database fundamentals: scalable buffer pooling, concurrency control, durability, elasticity, and fault tolerance. You can read more: https://www.eloqdata.com/blog/2025/07/14/technology https://www.eloqdata.com/blog/2025/07/14/technology This architectural choice is what enables EloqDoc to deliver features that Postgres-based solutions cannot easily match, including: full compatibility, native Multi-Writer capability, Object Storage First and extremely low-latency distributed transactions.
- matharmin 1y agoFoundationDB also has a Mongo-compatible document layer, but it seems like the last release was 6 years ago, so probably doesn't count anymore.