# apache/celeborn

Apache Celeborn is an elastic and high-performance service for shuffle and spilled data.

Repository: https://github.com/apache/celeborn
Canonical: https://ross.abutalabs.com/products/celeborn
Homepage: https://celeborn.apache.org/
Language: Java
License: Apache-2.0
License Family: permissive
Topics: shuffle, spark, bigdata
Last push: 2026-08-26T06:43:26+00:00

## Health v2 (maintenance only)
Score: 95/100 (v2, computed 2026-09-02T17:46:02.011165+00:00)
- activity 99, release rhythm 86, longevity 100
- inputs: {"age_days": 1727, "days_push": 7, "days_rel": 16, "gap_med": 76.5, "n_releases_24m": 9}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1061, forks 457 (observed 2026-08-28T04:03:26.021088+00:00)

## What it is
Apache Celeborn is an elastic, high-performance intermediate data service for big data compute engines, focused on managing shuffle and spilled data. It decouples compute from storage of intermediate data via a Master/Worker architecture with push-based shuffle write and merged shuffle read.

## Use cases
- speed up spark shuffle in large clusters
- replace spark external shuffle service
- manage shuffle data for flink jobs
- reduce shuffle failures and straggler tasks in mapreduce
- disaggregate compute and shuffle storage
- stabilize etl pipelines with heavy shuffle

## When to choose
- you run large-scale Spark, Flink, or Hadoop MapReduce workloads with heavy shuffle
- you need elastic, fault-tolerant shuffle management separated from compute nodes
- you want push-based shuffle to improve stability and performance

## When to avoid
- your workloads are small and local shuffle works fine
- you cannot operate an additional Master/Worker cluster service
- you use engines other than Spark, Flink, or MapReduce

## Facets
- artifact type: service
- maturity: active
- function: caching, message-queue, microservices, streaming
- domain: big-data, microservices, analytics
- platform: jvm, self-hosted
- tags: shuffle-service, apache-spark, apache-flink, hadoop-mapreduce, push-shuffle, intermediate-data, map-reduce, data-engineering, linux, docker

## Member repositories
- apache/celeborn (main) score 95

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:03:26.021088+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 2026-08-30T06:56:49.568228+00:00, confidence not recorded.
  - readme: https://github.com/apache/celeborn (fetched 2026-08-28T04:03:26.021088+00:00, sha 3880c9cbdbb8)
  - homepage: https://celeborn.apache.org/ (fetched 2026-08-29T12:58:31.637514+00:00, sha a5f378eb4f12)
  - site_page: https://celeborn.apache.org/docs/latest (fetched 2026-08-29T12:58:31.646436+00:00, sha e924200c43a5)
  - site_page: https://celeborn.apache.org/community/contributor_guide/docs_and_website (fetched 2026-08-29T12:58:31.648631+00:00, sha 7fbf10b313fe)
- Data as of 2026-08-30T08:39:29.467469+00:00.