Apache Helix

Apache Helix is a generic cluster management framework for partitioned and replicated distributed resources. It automates partition management, replication, fault tolerance, and cluster expansion for distributed systems, providing a REST API for cluster administration and a Java API for participant, spectator, and controller roles.

Apache Helix publishes 4 APIs on the APIs.io network, including Clusters API, Instances API, Resources API, and 1 more. Tagged areas include Apache, Cluster Management, Distributed Systems, Open-Source, and Partitioning.

The Apache Helix catalog on APIs.io includes 1 JSON-LD context and 2 Spectral governance rulesets.

Apache Helix’s developer surface includes documentation, getting-started guide, and 13 more developer resources.

🌐 Visit website 📡 Source on GitHub

39.8/100 developing ▬ flat Agent 17/100 agent aware self hosted · Apache-2.0 Full breakdown ↓
scored 2026-09-08 · rubric v0.20.0

AccessFreemium

1 APIs 8 Features 5 Use Cases

Apache Cluster Management Distributed Systems Open-Source Partitioning Replication

Kin Score

Kin Score How this is scored →
scored 2026-09-08 · rubric v0.20.0

Composite quality — 39.8/100 · developing

Contract Quality 10.9 / 20

Developer Ergonomics 4.6 / 16

Access Clarity 2.5 / 16

Operational Transparency 3.8 / 10

Contract Governance 2.8 / 10

Discoverability 4.7 / 8

Open Source Surface 7.5 / 10

Create-or-Update Ergonomics 0.0 / 10

Agent readiness — 17/100 · agent aware

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

Documented Reversibility 0 / 6

MCP Server 0 / 12

Machine-Readable Auth 0 / 10

Idempotency 0 / 9

Stable Error Semantics 0 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 7 / 7

Typed Event Surface 0 / 6

Agent Skills 0 / 5

Well-Known Catalog 0 / 4

Consent & Bot Identity 0 / 3

A2A Agent Card 0 / 8

Dry-Run / Simulate Mode 0 / 4

Delegated User Identity 0 / 6

Protected Resource Metadata 0 / 5

Registration Without a Human 0 / 6

Agentic Commerce Well-Known Document 0 / 5

Open Source Surface applies to this provider. This product is open source and we read its repository directly, so Open Source Surface carries 10 points of the composite. It is scored from what the repository actually publishes — a security policy, a contribution guide, a release history, a code of conduct — read live from the provider rather than inferred from our own catalog pointers. This facet adds; nothing was taken away to make room for it. An open-source project is not excused from the commercial facets, because exemption would strip it of the points it does earn. If we have the wrong repository, or this product is not open source, say so on your provider repo and we will drop the facet rather than have you publish against it.

Create-or-Update Ergonomics applies to this provider. This API accepts writes, so it carries 10 points of the composite. It is scored from the published contracts themselves: whether a caller can create-or-update in one call, whether the write accepts a key the caller already holds, and whether the response says which branch ran. Without that, every write needs a search-and-branch in front of it, and the first time that check is skipped a duplicate record is created. Scored against the observed mean rather than raw — a provider at the catalog average is unchanged by this facet, not penalised by it.

The six quality facets above are damped to 80 points between them, because the conditional facet above carries the other 20. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 80% of its nominal weight, not 100%. The full arithmetic is at apis.io/rating/.

Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. Every facet and dimension name above is a link: it opens that measurement's own page — what it means, the exact checks that feed it, how the whole catalog distributes on it, and the providers at the top of it. This rating is computed from github.com/api-evangelist/apache-helix: open an issue to ask a question, or submit a pull request to add artifacts. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

APIs 5

Individual APIs this provider publishes, each with its own machine-readable definition.

Apache Helix Java API

Java API for implementing Helix participant, spectator, and controller roles, with APIs for resource management, task execution, and state machine definitions.

Apache Helix Clusters API

Cluster management operations

Apache Helix Instances API

Instance management operations

Apache Helix Resources API

Resource management operations

Apache Helix State API

Partition state operations

Open Collections 6

Open, tool-agnostic API collections (OpenAPI-derived and Bruno).

API Collection

OPEN COLLECTION

Apache Helix REST Clusters API

OPEN COLLECTION

Apache Helix REST Clusters Instances API

OPEN COLLECTION

Apache Helix REST Clusters Resources API

OPEN COLLECTION

Apache Helix REST API

OPEN COLLECTION

Apache Helix REST Clusters State API

OPEN COLLECTION

Pricing Plans 1

Published pricing tiers and plan structures.

Apache Helix Plans Pricing

3 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Apache Helix Rate Limits

5 limits

RATE LIMITS

FinOps 1

Cost, billing, and metering signals for API financial operations.

Apache Helix Finops

FINOPS

Features 8

Notable capabilities this provider offers.

Automatic Partition Management

Automatically assign and balance partitions across cluster nodes using pluggable rebalancer algorithms.

State Machine Framework

Define custom resource state machines (e.g., Master-Slave, Leader-Standby) for any distributed service.

Fault Tolerance

Detect node failures and automatically reassign partitions to maintain replication targets.

REST API

HTTP REST API for cluster administration, resource management, and state inspection.

Task Framework

Distributed task scheduling framework for batch jobs and recurring workflows with failure handling.

ZooKeeper Integration

Uses Apache ZooKeeper as the distributed coordination backend for cluster state storage.

Spectator API

Read-only API for external services to observe resource state and routing decisions.

Cloud-Aware Rebalancing

Rack and zone-aware partition placement for fault-domain isolation in cloud environments.

Scroll for all 8

Semantic Vocabularies 1

JSON-LD contexts and semantic vocabularies used across these APIs.

Apache Helix Rest Context

16 classes · 0 properties

JSON-LD

Spectral Rules 2

Spectral governance rulesets for linting and validating these APIs.

Apache Helix API Rules

5 rules · 3 warnings 2 info

SPECTRAL

Apache Helix API Rules

13 rules · 2 errors 9 warnings 2 info

SPECTRAL

JSON Schema 6

Standalone JSON Schema definitions for this provider's data models.

Cluster

5 properties

JSON SCHEMA

ExternalView

2 properties

JSON SCHEMA

IdealState

3 properties

JSON SCHEMA

Instance

5 properties

JSON SCHEMA

Partition

2 properties

JSON SCHEMA

Resource

5 properties

JSON SCHEMA

JSON Structure 6

JSON Structure definitions describing this provider's data shapes.

Helix Rest Cluster Structure

5 properties

JSON STRUCTURE

Helix Rest Externalview Structure

2 properties

JSON STRUCTURE

Helix Rest Idealstate Structure

3 properties

JSON STRUCTURE

Helix Rest Instance Structure

5 properties

JSON STRUCTURE

Helix Rest Partition Structure

2 properties

JSON STRUCTURE

Helix Rest Resource Structure

5 properties

JSON STRUCTURE

Examples 6

Example request and response payloads for these APIs.

Helix Rest Cluster Example

5 fields

EXAMPLE

Helix Rest Externalview Example

2 fields

EXAMPLE

Helix Rest Idealstate Example

3 fields

EXAMPLE

Helix Rest Instance Example

5 fields

EXAMPLE

Helix Rest Partition Example

2 fields

EXAMPLE

Helix Rest Resource Example

5 fields

EXAMPLE

Security Posture 2

Authentication, domain security, vulnerability disclosure, and trust-center signals.

Apache Helix Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Apache Helix Vulnerability Disclosure

security.txt · contact published

SECURITY

Agentic Access 1

Recommended x-agentic-access execution contracts for AI agents.

Apache Helix Agentic Access

10 operations · 2 acting

AGENTIC

Use Cases 5

What developers build with this provider.

Distributed Database Cluster Management

Manage shard assignment and replication for distributed databases like DistributedLog or Espresso.

Search Index Partition Management

Automatically balance and assign search index shards across a cluster of query servers.

Distributed Task Scheduling

Schedule and execute distributed batch tasks with automatic retry and failure recovery.

Microservices Load Balancing

Use Helix spectator API to implement client-side load balancing based on partition state.

Stateful Service Migration

Perform rolling upgrades and partition migrations without service downtime.

Integrations 4

Pre-built integrations with other platforms and tools.

Apache ZooKeeper

ZooKeeper is the required coordination backend for Helix cluster state management.

Apache Kafka

Helix is used internally by some Kafka ecosystem projects for partition management.

LinkedIn Pinot

Apache Pinot uses Helix for real-time OLAP cluster partition and segment management.

LinkedIn Venice

Venice feature store uses Helix for managing data store partition assignments.

Resources

Get Started 1

Portal, sign-up, and the first successful call

GettingStarted

GettingStarted

Documentation 1

Reference material describing how the API behaves

Documentation

Documentation

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

AgenticAccess

Design & Contract 2

Pagination, idempotency, versioning, errors, and events

SpectralRules

SpectralRules

Vocabulary

Vocabulary

Build 3

SDKs, sample code, and the tooling you integrate with

CodeOfConduct

CodeOfConduct

GitHubOrganization

GitHubOrganization

GitHubRepository

GitHubRepository

Access & Security 3

Authentication, authorization, and security posture

SecurityPolicy

SecurityPolicy

VulnerabilityDisclosure

VulnerabilityDisclosure

DomainSecurity

DomainSecurity

Operate 2

Status, limits, changes, and where to get help

IssueTracker

IssueTracker

Releases

Releases

Commercial 1

Pricing, plans, and the legal terms of use

License

License

Company 1

The organization behind the API

Website

Website

Source (apis.yml)

aid: apache-helix
name: Apache Helix
description: Apache Helix is a generic cluster management framework for partitioned and replicated distributed resources.
  It automates partition management, replication, fault tolerance, and cluster expansion for distributed systems, providing
  a REST API for cluster administration and a Java API for participant, spectator, and controller roles.
type: Index
deliveryModel:
  model: self-hosted
  license: Apache-2.0
  open_source: true
  commercial: false
  callable_host: false
  label: Self-hosted open source · you run it yourself
  confidence: high
  source:
  - license
  - openapi
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: freemium
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Freemium
  confidence: medium
  source:
  - plans
  generated: '2026-07-22'
  method: derived
position: Consuming
access: 3rd-Party
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/apache-helix.png
tags:
- Apache
- Cluster Management
- Distributed Systems
- Open-Source
- Partitioning
- Replication
tags_raw:
- Apache
- Cluster Management
- Distributed Systems
- Open Source
- Partitioning
- Replication
created: '2026-03-16'
modified: '2026-05-19'
url: https://raw.githubusercontent.com/api-evangelist/apache-helix/refs/heads/main/apis.yml
specificationVersion: '0.23'
apis:
- aid: apache-helix:apache-helix-java-api
  name: Apache Helix Java API
  description: Java API for implementing Helix participant, spectator, and controller roles, with APIs for resource management,
    task execution, and state machine definitions.
  humanURL: https://helix.apache.org/0.9.9-docs/tutorial_participant.html
  tags:
  - Java
  - SDK
  - State Machine
  properties:
  - type: Documentation
    url: https://helix.apache.org/0.9.9-docs/tutorial_participant.html
  - type: SDKs
    url: https://search.maven.org/artifact/org.apache.helix/helix-core
    title: Java SDK (Maven Central)
- aid: apache-helix:apache-helix-clusters-api
  name: Apache Helix Clusters API
  description: Cluster management operations
  humanURL: https://helix.apache.org/0.9.9-docs/tutorial_admin.html
  baseURL: http://localhost:9100
  tags:
  - Cluster
  tags_raw:
  - Clusters
  properties:
  - type: OpenAPI
    url: openapi/apache-helix-clusters-api-openapi.yml
  - type: Documentation
    url: https://helix.apache.org/0.9.9-docs/tutorial_admin.html
  - type: JSONSchema
    url: json-schema/helix-rest-cluster-schema.json
  - type: JSONLD
    url: json-ld/apache-helix-rest-context.jsonld
- aid: apache-helix:apache-helix-instances-api
  name: Apache Helix Instances API
  description: Instance management operations
  humanURL: https://helix.apache.org/0.9.9-docs/tutorial_admin.html
  baseURL: http://localhost:9100
  tags:
  - Instances
  properties:
  - type: OpenAPI
    url: openapi/apache-helix-instances-api-openapi.yml
  - type: Documentation
    url: https://helix.apache.org/0.9.9-docs/tutorial_admin.html
  - type: JSONSchema
    url: json-schema/helix-rest-cluster-schema.json
  - type: JSONLD
    url: json-ld/apache-helix-rest-context.jsonld
- aid: apache-helix:apache-helix-resources-api
  name: Apache Helix Resources API
  description: Resource management operations
  humanURL: https://helix.apache.org/0.9.9-docs/tutorial_admin.html
  baseURL: http://localhost:9100
  tags:
  - Resources
  properties:
  - type: OpenAPI
    url: openapi/apache-helix-resources-api-openapi.yml
  - type: Documentation
    url: https://helix.apache.org/0.9.9-docs/tutorial_admin.html
  - type: JSONSchema
    url: json-schema/helix-rest-cluster-schema.json
  - type: JSONLD
    url: json-ld/apache-helix-rest-context.jsonld
- aid: apache-helix:apache-helix-state-api
  name: Apache Helix State API
  description: Partition state operations
  humanURL: https://helix.apache.org/0.9.9-docs/tutorial_admin.html
  baseURL: http://localhost:9100
  tags:
  - States
  tags_raw:
  - State
  properties:
  - type: OpenAPI
    url: openapi/apache-helix-state-api-openapi.yml
  - type: Documentation
    url: https://helix.apache.org/0.9.9-docs/tutorial_admin.html
  - type: JSONSchema
    url: json-schema/helix-rest-cluster-schema.json
  - type: JSONLD
    url: json-ld/apache-helix-rest-context.jsonld
common:
- type: Website
  url: https://www.apache.org/
- type: IssueTracker
  url: https://github.com/apache/helix/issues
- type: Releases
  url: https://github.com/apache/helix/releases
- type: SecurityPolicy
  url: https://github.com/apache/helix/blob/master/SECURITY.md
- type: CodeOfConduct
  url: https://github.com/apache/.github/blob/main/.github/CODE_OF_CONDUCT.md
- type: License
  name: Apache-2.0
  url: https://github.com/apache/helix/blob/master/LICENSE
- type: AgenticAccess
  url: agentic-access/apache-helix-agentic-access.yml
- type: VulnerabilityDisclosure
  url: security/apache-helix-vulnerability-disclosure.yml
- type: DomainSecurity
  url: security/apache-helix-domain-security.yml
- type: Documentation
  url: https://helix.apache.org/
- type: GettingStarted
  url: https://helix.apache.org/0.9.9-docs/Quickstart.html
- type: GitHubOrganization
  url: https://github.com/apache
- type: GitHubRepository
  url: https://github.com/apache/helix
- type: SpectralRules
  url: rules/apache-helix-spectral-rules.yml
- type: Vocabulary
  url: vocabulary/apache-helix-vocabulary.yaml
- type: Features
  data:
  - name: Automatic Partition Management
    description: Automatically assign and balance partitions across cluster nodes using pluggable rebalancer algorithms.
  - name: State Machine Framework
    description: Define custom resource state machines (e.g., Master-Slave, Leader-Standby) for any distributed service.
  - name: Fault Tolerance
    description: Detect node failures and automatically reassign partitions to maintain replication targets.
  - name: REST API
    description: HTTP REST API for cluster administration, resource management, and state inspection.
  - name: Task Framework
    description: Distributed task scheduling framework for batch jobs and recurring workflows with failure handling.
  - name: ZooKeeper Integration
    description: Uses Apache ZooKeeper as the distributed coordination backend for cluster state storage.
  - name: Spectator API
    description: Read-only API for external services to observe resource state and routing decisions.
  - name: Cloud-Aware Rebalancing
    description: Rack and zone-aware partition placement for fault-domain isolation in cloud environments.
- type: UseCases
  data:
  - name: Distributed Database Cluster Management
    description: Manage shard assignment and replication for distributed databases like DistributedLog or Espresso.
  - name: Search Index Partition Management
    description: Automatically balance and assign search index shards across a cluster of query servers.
  - name: Distributed Task Scheduling
    description: Schedule and execute distributed batch tasks with automatic retry and failure recovery.
  - name: Microservices Load Balancing
    description: Use Helix spectator API to implement client-side load balancing based on partition state.
  - name: Stateful Service Migration
    description: Perform rolling upgrades and partition migrations without service downtime.
- type: Integrations
  data:
  - name: Apache ZooKeeper
    description: ZooKeeper is the required coordination backend for Helix cluster state management.
  - name: Apache Kafka
    description: Helix is used internally by some Kafka ecosystem projects for partition management.
  - name: LinkedIn Pinot
    description: Apache Pinot uses Helix for real-time OLAP cluster partition and segment management.
  - name: LinkedIn Venice
    description: Venice feature store uses Helix for managing data store partition assignments.
maintainers:
- FN: Kin Lane
  email: info@apievangelist.com

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