# Qihoo360/poseidon

A search engine which can hold 100 trillion lines of log data.

Repository: https://github.com/Qihoo360/poseidon
Canonical: https://ross.abutalabs.com/products/poseidon
Language: Go
License: BSD-3-Clause
License Family: permissive
Topics: poseidon, search-engine, golang, big-data, map-reduce
Last push: 2017-05-22T10:36:56+00:00

## Health v2 (maintenance only)
Score: 32/100 (v2, computed 2026-09-02T17:46:02.011165+00:00)
- activity 0, release rhythm 35, longevity 100
- inputs: {"age_days": 3604, "days_push": 3390, "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 1981, forks 429 (observed 2026-08-28T04:06:01.797882+00:00)

## What it is
Poseidon is a distributed log search platform from Qihoo 360 that builds inverted indexes over Hadoop/HDFS-stored logs and serves sub-second string searches across hundreds of trillions of records. It consists of Map/Reduce index builders plus Go-based HTTP microservices (searcher, proxy, meta, idgenerator, hdfsreader).

## Use cases
- search trillions of log lines in seconds
- query historical logs for security incident investigation
- track APT threat activity across massive log archives
- full-text search over HDFS data without duplicating storage
- build inverted indexes with Hadoop Map/Reduce jobs
- search petabyte-scale structured or unstructured data

## When to choose
- you already run a Hadoop/HDFS cluster with massive log data
- you need fast string retrieval over historical logs for security forensics
- you want search without moving data out of Hadoop storage

## When to avoid
- you need a general-purpose document search engine with real-time indexing
- you don't operate Hadoop infrastructure
- you need actively maintained software with recent releases
- your dataset is small enough for Elasticsearch or similar

## Facets
- artifact type: service
- maturity: maintenance
- function: search-engine, http-server, middleware, etl
- domain: big-data, security, databases
- platform: go, jvm, self-hosted
- tags: log-search, inverted-index, hadoop, map-reduce, hdfs, microservices, distributed-search, security-analytics, search, linux, docker

## Member repositories
- Qihoo360/poseidon (main) score 32

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:06:01.797882+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 2026-08-30T03:03:57.056190+00:00, confidence not recorded.
  - readme: https://github.com/Qihoo360/poseidon (fetched 2026-08-28T04:06:01.797882+00:00, sha 8ff0ead15ff9)
- Data as of 2026-08-30T08:39:29.467469+00:00.