# mit-pdos/noria

Fast web applications through dynamic, partially-stateful dataflow

Repository: https://github.com/mit-pdos/noria
Canonical: https://ross.abutalabs.com/products/noria
Language: Rust
License: Apache-2.0
License Family: permissive
Last push: 2021-10-30T01:24:05+00:00

## Health v2 (maintenance only)
Score: 32/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 0, release rhythm 35, longevity 100
- inputs: {"age_days": 3732, "days_push": 1769, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: no_releases
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 5244, forks 250 (observed 2026-08-28T04:09:13.611298+00:00)

## What it is
Noria is a streaming data-flow storage backend written in Rust that acts like a database but precomputes and incrementally maintains materialized views of SQL query results. It uses partially-stateful data-flow to keep cached results up-to-date as base tables change, giving read-heavy web applications extremely fast reads and high write throughput.

## Use cases
- speed up read-heavy web application backends without manual caching
- replace MySQL or MariaDB with a faster drop-in storage backend
- maintain incrementally-updated materialized views for SQL queries
- cache relational query results like memcached but always consistent
- run Lobsters-like workloads with 5x higher throughput
- dynamically change queries and data-flow at runtime

## When to choose
- your web app is bottlenecked on repeated SQL reads and you want automatic, always-fresh caching
- you want materialized views maintained incrementally without manual cache invalidation
- you can adopt a research-grade Rust storage system and run ZooKeeper

## When to avoid
- you need a production-hardened database with broad ecosystem support
- your workload is write-heavy or requires full SQL feature coverage
- you cannot operate additional infrastructure like ZooKeeper

## Facets
- artifact type: service
- maturity: maintenance
- function: database, caching, streaming, search-engine
- domain: databases, web-development, backend, microservices
- platform: rust, self-hosted
- tags: materialized-views, dataflow, stream-processing, sql, mysql-adapter, research-system, data-engineering, linux, docker

## Member repositories
- mit-pdos/noria (main) score 32

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:09:13.611298+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-29T17:59:35.945157+00:00, confidence not recorded.
  - readme: https://github.com/mit-pdos/noria (fetched 2026-08-28T04:09:13.611298+00:00, sha 5a994325883f)
  - registry_crates: https://crates.io/api/v1/crates/noria (fetched 2026-08-29T08:54:40.306936+00:00, sha 6671d95db20e)
- Data as of 2026-08-30T08:39:29.467469+00:00.