# facebookarchive/LogDevice

Distributed storage for sequential data

Repository: https://github.com/facebookarchive/LogDevice
Canonical: https://ross.abutalabs.com/products/logdevice
Homepage: https://logdevice.io
Language: C++
License: NOASSERTION
License Family: other
Archived: true
Last push: 2021-10-12T21:28:41+00:00

## Health v2 (maintenance only)
Score: 10/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 0, release rhythm 8, longevity 100
- inputs: {"age_days": 2912, "days_push": 1786, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: archived, no_license
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1901, forks 211 (observed 2026-08-28T04:05:51.564254+00:00)

## What it is
LogDevice is a scalable, fault-tolerant distributed log storage system written in C++ by Facebook, storing append-only record streams replicated across nodes with total ordering. It is now archived and no longer maintained.

## Use cases
- store write-ahead logs for durability
- transaction logging for a distributed database
- event logging at scale
- stream processing backend
- ML training data pipelines
- replicated state machine logs
- journals of deferred work items

## When to choose
- you need replicated, ordered append-only logs at large scale and can self-maintain a fork
- you want a log store tuned for durability-efficiency and consistency-availability trade-offs
- you need to store up to a million logs on a single cluster

## When to avoid
- you want actively maintained software with community support
- you need a simple message queue or Kafka replacement without operational overhead
- your deployment target is not Linux (only Ubuntu 18.04 is supported)

## Facets
- artifact type: service
- maturity: abandoned
- function: database, streaming, message-queue, caching
- domain: databases, microservices, big-data
- platform: cpp, self-hosted
- tags: distributed-log-storage, append-only-log, fault-tolerant, write-ahead-logging, event-streaming, archived-project, zookeeper, data-engineering, messaging, linux, docker

## Member repositories
- facebookarchive/LogDevice (main) score 10

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:05:51.564254+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 2026-08-30T03:11:56.434383+00:00, confidence not recorded.
  - readme: https://github.com/facebookarchive/LogDevice (fetched 2026-08-28T04:05:51.564254+00:00, sha de0ace88258b)
  - homepage: https://logdevice.io (fetched 2026-08-29T10:51:04.852294+00:00, sha 45fc5bd24646)
  - site_page: https://logdevice.io/docs/Overview.html (fetched 2026-08-29T10:51:04.861081+00:00, sha dbce4a7c45f1)
  - site_page: https://logdevice.io/docs/FirstCluster.html (fetched 2026-08-29T10:51:04.862975+00:00, sha ec99eda2b7bc)
- Data as of 2026-08-30T08:39:29.467469+00:00.