Open source DocumentDB 1.0, an MIT-licensed document database built on PostgreSQL with compatibility for the MongoDB wire protocol, has reached its first generally available release. Announced by Microsoft and supported by database organizations including AWS, Google, and Cockroach Labs, the project aims to give developers alternative implementations of a familiar document data model. However, the community remains perplexed by the choice of a name also used for Amazon's DocumentDB product.
DocumentDB 1.0 consists of a PostgreSQL extension and a gateway that translates MongoDB protocol requests into PostgreSQL calls. It supports PostgreSQL 15 through 18 via container images, with Linux packages available for 17 and 18, and includes a Kubernetes operator. The release focuses on security, stability, and fixes for indexing, aggregation, and geospatial queries.
Microsoft announced the open source project early in 2025, and it joined the Linux Foundation a few months later, with support from AWS, Cockroach Labs, Google, Snowflake, and Yugabyte. The project operates under the MIT license, drawing an explicit contrast with MongoDB's SSPL.
In a Hacker News thread, user marifjeren wrote, "Name it anything else for god's sake. DocumentDB is already what everybody calls Amazon DocumentDB." The project provides a page discussing name disambiguation, covering DocumentDB, Azure DocumentDB, and Azure Cosmos DB.
Microsoft product manager Patty Chow explained why multiple implementations are needed. "MongoDB has given developers a widely used way to work with document data," Chow wrote. "Familiar drivers and query patterns are worth preserving. Alternative implementations give developers a chance to keep using that knowledge while evaluating different approaches to storage and deployment."
On compatibility, a Reddit user, 716green, noted their experience with similar projects: "Compatibility between MongoDB and FerretDB has been absolutely minimal compared to what you would probably expect." DocumentDB and FerretDB are distinct but related projects: DocumentDB provides the PostgreSQL extensions and its own MongoDB-compatible gateway, while FerretDB uses the DocumentDB extensions as its backend.
Layerbase ran an initial YCSB comparison of FerretDB and the PostgreSQL-based DocumentDB, finding that DocumentDB delivered 20–33% higher read throughput while FerretDB had lower tail latency for updates in mixed workloads; the results were not conclusive. An open GitHub issue reports higher query latency in DocumentDB 1.0 than MongoDB 9.0.4, but the results have not been independently verified. The project plans separate long-term support and development tracks.
Analysis
Why This Matters
- Gives developers a fully open-source, MIT-licensed document database compatible with MongoDB drivers, expanding choice in a critical data infrastructure category.
- Highlights the clash between vendor-friendly product naming and established community expectations, illustrated by direct conflict with Amazon's DocumentDB.
- Continues the trend of major cloud vendors co-developing core infrastructure under neutral foundations, but community skepticism about naming and compatibility suggests adoption hurdles.
Background
DocumentDB is an open-source document database developed by Microsoft and released under the MIT license. It is built as a PostgreSQL extension and is compatible with the MongoDB wire protocol. The project was announced in early 2025 and joined the Linux Foundation with support from multiple major database organizations.
Key Perspectives
Microsoft / Patty Chow: Defends the need for multiple implementations of the document database model, arguing that preserving familiar MongoDB query patterns allows developers to evaluate different storage and deployment approaches.
Community Developers (Hacker News, Reddit): Express confusion and frustration over the DocumentDB name due to its pre-existing association with Amazon's product, and raise concerns about real-world compatibility citing experiences with similar projects.
What to Watch
- Whether the project addresses the naming conflict or rebrands in response to community pressure.
- Independent performance benchmarks to verify the initial YCSB and GitHub latency findings.
- Finalisation of the project's versioning policy and the specifics of its long-term support track.
Checked
12 claims in this story checked against 1 source: 11 supported.
Show each claim
- SupportedDocumentDB 1.0 has reached general availability as its first generally available release.InfoQ: “DocumentDB 1.0 is the first generally available release of the open source, MIT-licensed document database built on PostgreSQL”
- Partly supportedThe database is Microsoft-backed.InfoQ: “Microsoft announced the open source project early in 2025”
- SupportedCommunity confusion over the name persists.InfoQ: “Even if the project provides a page discussing the DocumentDB name disambiguation, covering the open source project, Azure DocumentDB, and Azure Cosmos DB, the community remains perplexed about the choice.”
- SupportedHacker News user marifjeren wrote, “Name it anything else for god's sake. DocumentDB is already what everybody calls Amazon DocumentDB.”InfoQ: “Name it anything else for god's sake. DocumentDB is already what everybody calls Amazon DocumentDB.”
- SupportedMicrosoft announced the project, and AWS, Google, and Cockroach Labs are among the organizations supporting it.InfoQ: “Microsoft announced the open source project early in 2025 ... The project joined the Linux Foundation a few months later, with support from other large database organizations including AWS, Cockroach Labs, Google, Snowflake, and Yugabyte.”
- SupportedDocumentDB consists of a PostgreSQL extension and a gateway that translates MongoDB protocol requests into PostgreSQL calls.InfoQ: “DocumentDB consists of a PostgreSQL extension that provides MongoDB API-compatible functionality and a gateway that translates MongoDB protocol requests into PostgreSQL calls.”
- SupportedVersion 1.0 supports PostgreSQL 15–18 through container images, with Linux packages for PostgreSQL 17 and 18.InfoQ: “Version 1.0 supports PostgreSQL 15–18 through container images, with Linux packages available for PostgreSQL 17 and 18”
- SupportedPatty Chow wrote that familiar drivers and query patterns are worth preserving and that alternative implementations let developers evaluate different approaches to storage and deployment.InfoQ: “Familiar drivers and query patterns are worth preserving. Alternative implementations give developers a chance to keep using that knowledge while evaluating different approaches to storage and deployment.”
- SupportedReddit user 716green wrote, “Compatibility between MongoDB and FerretDB has been absolutely minimal compared to what you would probably expect.”InfoQ: “Compatibility between MongoDB and FerretDB has been absolutely minimal compared to what you would probably expect.”
- SupportedFerretDB uses DocumentDB’s PostgreSQL extensions as its backend, while DocumentDB has its own MongoDB-compatible gateway.InfoQ: “DocumentDB provides the PostgreSQL extensions and its own MongoDB-compatible gateway, while FerretDB is a separate project that uses the DocumentDB extensions as its backend and provides its own MongoDB-compatible interface.”
- SupportedLayerbase’s initial YCSB comparison found 20–33% higher read throughput for DocumentDB, while FerretDB had lower tail latency for updates in mixed workloads; the results were not conclusive.InfoQ: “Layerbase recently ran an initial comparison of FerretDB and the PostgreSQL-based DocumentDB using YCSB benchmarks, finding that DocumentDB delivered 20–33% higher read throughput, while FerretDB had lower tail latency for updates in mixed workloads, but noting the results are not conclusive.”
- SupportedAn open GitHub issue reports higher query latency in DocumentDB 1.0 than MongoDB 9.0.4, and the results have not been independently verified.InfoQ: “An open GitHub issue reports higher query latency in DocumentDB 1.0 than MongoDB 9.0.4 across several workloads, but the results have not been independently verified.”
