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Active Job Async adapter

The Async adapter runs jobs with an in-process thread pool.

This is the default queue adapter. It’s well-suited for dev/test since it doesn’t need an external infrastructure, but it’s a poor fit for production since it drops pending jobs on restart.

To use this adapter, set queue adapter to :async:

config.active_job.queue_adapter = :async

To configure the adapter’s thread pool, instantiate the adapter and pass your own config:

config.active_job.queue_adapter = \
  min_threads: 1,
  max_threads: 2 * Concurrent.processor_count,
  idletime: 600.seconds

The adapter uses a Concurrent Ruby thread pool to schedule and execute jobs. Since jobs share a single thread pool, long-running jobs will block short-lived jobs. Fine for dev/test; bad for production.


Class Public methods


See Concurrent::ThreadPoolExecutor for executor options.

# File activejob/lib/active_job/queue_adapters/async_adapter.rb, line 35
def initialize(**executor_options)
  @scheduler =**executor_options)