# twitter/summingbird

Streaming MapReduce with Scalding and Storm

Repository: https://github.com/twitter/summingbird
Canonical: https://ross.abutalabs.com/products/summingbird
Homepage: https://twitter.com/summingbird
Language: Scala
License: Apache-2.0
License Family: permissive
Archived: true
Last push: 2022-01-19T17:31:02+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": 5090, "days_push": 1687, "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 2123, forks 256 (observed 2026-08-28T04:06:16.650211+00:00)

## What it is
Summingbird is a Scala library for writing MapReduce aggregation programs that look like native collection transformations and run on distributed platforms such as Storm (realtime) and Scalding (batch), including a hybrid batch/realtime mode. It is officially retired by Twitter.

## Use cases
- write streaming mapreduce aggregations in scala
- run the same aggregation logic in batch and realtime
- build fault-tolerant hybrid batch/streaming pipelines on storm and scalding
- word counting over large data streams
- sum key-value events into a distributed store

## When to choose
- you already run Scalding or Storm on the JVM and want unified batch/realtime aggregation code
- you need hybrid batch/realtime fault-tolerance semantics and can maintain the library yourself

## When to avoid
- starting a new project - the project is officially retired and unmaintained
- you use modern stream processors like Flink, Kafka Streams, or Spark Streaming
- you are not on the JVM/Scala ecosystem

## Facets
- artifact type: library
- maturity: abandoned
- function: streaming, etl, data-science
- domain: big-data, microservices
- platform: jvm
- tags: mapreduce, storm, scalding, scala, batch-realtime-hybrid, retired, data-engineering

## Member repositories
- twitter/summingbird (main) score 10

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:06:16.650211+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 2026-08-30T02:52:51.339073+00:00, confidence not recorded.
  - readme: https://github.com/twitter/summingbird (fetched 2026-08-28T04:06:16.650211+00:00, sha ea507a309ff0)
- Data as of 2026-08-30T08:39:29.467469+00:00.