Jets Job Concurrency

Reserved Concurrency Settings

You can adjust concurrency settings for each queue. example:

config/jets/deploy.rb

Jets.deploy.configure do
  config.job.enable = true

  config.job.default_queue.lambda.reserved_concurrency = 5

  # Add additional queues. Note: default_queue is always created
  config.job.additional_queues = %w[urgent low_priority]

  # Adjust settings for each queue
  config.job.queues.low_priority.lambda.reserved_concurrency = 2
  config.job.queues.urgent.lambda.reserved_concurrency = 10
end

You can fine tune how many Lambda function instances you want to handle processing for each queue.

Note: The config.job.default_queue has a separate path that different than the additional queue config keys.

Concurrency Cheatsheet

Also, this might be helpful. This shows you how to control concurrency the lambda functions like jets-default_queue_event-handle manually.

jets concurrency:info
jets concurrency:get -n jets-default_queue_event-handle
jets concurrency:set -n jets-default_queue_event-handle --reserved 20

Note: Use things command set the concurrency outside of the jets deploy lifecyle. It’s akin to making manually changes to on a server. The next jets deploy may overwrite any manual changes.

Example CLI Session

❯ jets concurrency:get -n jets-urgent_queue_event-handle
Settings for Function: rails-dev-jets-urgent_queue_event-handle
Reserved concurreny: 22
Provisioned concurrency: not set

❯ jets concurrency:set -n jets-urgent_queue_event-handle --reserved 200
Will update the concurrency settings for rails-dev-jets-urgent_queue_event-handle
Are you sure? (y/N) y
Updating concurrency settings for rails-dev-jets-urgent_queue_event-handle
Set reserved concurrency to 200

❯ jets concurrency:get -n jets-urgent_queue_event-handle
Settings for Function: rails-dev-jets-urgent_queue_event-handle
Reserved concurrency: 200
Provisioned concurrency: not set

❯ jets concurrency:info
Concurrency for rails-dev
+--------------------------------------+----------+
|               Function               | Reserved |
+--------------------------------------+----------+
| controller                           | 25       |
| jets-default_queue_event-handle      | 5        |
| jets-low_priority_queue_event-handle | 2        |
| jets-prewarm_event-handle            | 2        |
| jets-urgent_queue_event-handle       | 200      |
| total                                | 234      |
+--------------------------------------+----------+
Account Limits
  Concurrent Executions: 1000
  Unreserved Concurrent Executions: 428

In this section: