Description
This project has been taken over by @deanpcmad. Original code by @brainopia.
Sidekiq strategy to support a granular queue control – limiting, pausing, blocking, querying.
Installation
Add this line to your application's Gemfile:
gem 'sidekiq-limit_fetch'
Then bundle install
.
Limitations
Important note: At this moment, sidekiq-limit_fetch
is incompatible with
- sidekiq pro's
reliable_fetch
sidekiq-rate-limiter
- any other plugin that rewrites fetch strategy of sidekiq.
Usage
If you are using this with Rails, you don't need to require it as it's done automatically.
To use this Gem in other Ruby projects, just add require 'sidekiq-limit_fetch'
.
Limits
Specify limits which you want to place on queues inside sidekiq.yml:
:limits:
queue_name1: 5
queue_name2: 10
Or set it dynamically in your code:
Sidekiq::Queue['queue_name1'].limit = 5
Sidekiq::Queue['queue_name2'].limit = 10
In these examples, tasks for the queue_name1
will be run by at most 5
workers at the same time and the queue_name2
will have no more than 10
workers simultaneously.
Ability to set limits dynamically allows you to resize worker distribution among queues any time you want.
Limits per process
If you use multiple sidekiq processes then you can specify limits per process:
:process_limits:
queue_name: 2
Or set it in your code:
Sidekiq::Queue['queue_name'].process_limit = 2
Busy workers by queue
You can see how many workers currently handling a queue:
Sidekiq::Queue['name'].busy # number of busy workers
Pauses
You can also pause your queues temporarily. Upon continuing their limits will be preserved.
Sidekiq::Queue['name'].pause # prevents workers from running tasks from this queue
Sidekiq::Queue['name'].paused? # => true
Sidekiq::Queue['name'].unpause # allows workers to use the queue
Sidekiq::Queue['name'].pause_for_ms(1000) # will pause for a second
Blocking queue mode
If you use strict queue ordering (it will be used if you don't specify queue weights) then you can set blocking status for queues. It means if a blocking queue task is executing then no new task from lesser priority queues will be ran. Eg,
:queues:
- a
- b
- c
:blocking:
- b
In this case when a task for b
queue is ran no new task from c
queue
will be started.
You can also enable and disable blocking mode for queues on the fly:
Sidekiq::Queue['name'].block
Sidekiq::Queue['name'].blocking? # => true
Sidekiq::Queue['name'].unblock
Advanced blocking queues
You can also block on array of queues. It means when any of them is running only queues higher and queues from their blocking group can run. It will be easier to understand with an example:
:queues:
- a
- b
- c
- d
:blocking:
- [b, c]
In this case tasks from d
will be blocked when a task from queue b
or c
is executed.
You can dynamically set exceptions for queue blocking:
Sidekiq::Queue['queue1'].block_except 'queue2'
Dynamic queues
You can support dynamic queues (that are not listed in sidekiq.yml but
that have tasks pushed to them (usually with Sidekiq::Client.push
)).
To use this mode you need to specify a following line in sidekiq.yml:
:dynamic: true
or
:dynamic:
:exclude:
- excluded_queue
to exclude excluded_queue
from dynamic queue
Dynamic queues will be ran at the lowest priority.
Maintenance
If you use flushdb
, restart the sidekiq process to re-populate the dynamic configuration.