# etcd-io/zetcd

Serve the Apache Zookeeper API but back it with an etcd cluster

Repository: https://github.com/etcd-io/zetcd
Canonical: https://ross.abutalabs.com/products/zetcd
Language: Go
License: Apache-2.0
License Family: permissive
Topics: zookeeper, etcd
Archived: true
Last push: 2023-09-25T12:46:07+00:00

## Health v2 (maintenance only)
Score: 10/100 (v2, computed 2026-09-02T17:46:02.011165+00:00)
- activity 0, release rhythm 8, longevity 100
- inputs: {"age_days": 3600, "days_push": 1073, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: archived
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1082, forks 93 (observed 2026-08-28T04:03:30.917222+00:00)

## What it is
zetcd is a ZooKeeper 'personality' proxy for etcd that serves the Apache ZooKeeper API backed by an etcd cluster. It lets existing ZooKeeper clients operate on etcd without modification, and includes a cross-checking mode that compares its responses against a real ZooKeeper server for equivalence testing.

## Use cases
- migrate applications from zookeeper to etcd without rewriting clients
- run zookeeper client libraries against an etcd cluster
- replace zookeeper servers with etcd in kubernetes environments
- test zookeeper api compatibility against etcd
- avoid running a separate zookeeper ensemble for coordination

## When to choose
- you have existing zookeeper clients but want etcd as the backing store
- you want to consolidate coordination services on etcd
- you need to verify zookeeper protocol behavior against etcd via cross-checking

## When to avoid
- you are starting fresh and can use etcd's native API directly
- you rely on zookeeper features not emulated by zetcd
- you need a project with frequent releases and active development

## Facets
- artifact type: service
- maturity: maintenance
- function: middleware, http-server, testing
- domain: databases, microservices, developer-tools
- platform: go, cross-platform
- tags: zookeeper, etcd, api-compatibility, protocol-translation, coordination-service, docker, linux

## Member repositories
- etcd-io/zetcd (main) score 10

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:03:30.917222+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 2026-08-30T06:51:15.125109+00:00, confidence not recorded.
  - readme: https://github.com/etcd-io/zetcd (fetched 2026-08-28T04:03:30.917222+00:00, sha 4ad00a998a4d)
- Data as of 2026-08-30T08:39:29.467469+00:00.