Elixir

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Overview

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Key Features

• High Performance - Built on Redis for speed and reliability
• Automatic Retries - Configurable retry strategies with exponential backoff
• Job Scheduling - Delay jobs or schedule them with cron expressions
• Priority Queues - Process important jobs first
• Rate Limiting - Control processing rates per queue or per group
• Parent-Child Jobs - Create complex workflows with job dependencies
• Real-time Events - Subscribe to job lifecycle events via Worker callbacks or QueueEvents
• Reliable - Stalled job detection and automatic recovery
• Observable - Built-in Telemetry integration for monitoring
• OTP Native - Built with GenServers and Supervisors following Elixir best practices
• Node.js Compatible - Jobs can be shared between Elixir and Node.js workers

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Requirements

• Elixir 1.15 or higher
• Erlang/OTP 26 or higher
• Redis 6.0 or higher

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Architecture

• Workers are GenServers that can be supervised
• QueueEvents use Redis Streams for real-time event subscriptions
• JobSchedulers manage repeatable/cron jobs
• FlowProducer creates parent-child job dependencies
• All components integrate with Elixir’s supervision trees

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Version

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Compatibility

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Use Cases

• Background job processing (emails, notifications, data processing)
• Distributed task execution across multiple nodes
• Cron-based job scheduling
• Building resilient job pipelines with parent-child dependencies
• Hybrid systems with jobs produced/consumed across Node.js, Python, PHP, and Elixir

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Installation

def deps do
  [
    {:bullmq, "~> 1.2"}
  ]
end

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Next Steps