在 Sidekiq，是否有控制台命令来查看队列中的内容并清除队列？

I haven't ever used Sidekiq, so it's possible that there are methods just for viewing the queued jobs, but they would really just be wrappers around Redis commands, since that's basically all Sidekiq (and Resque) is:

# See workers
Sidekiq::Client.registered_workers


# See queues
Sidekiq::Client.registered_queues


# See all jobs for one queue
Sidekiq.redis { |r| r.lrange "queue:app_queue", 0, -1 }


# See all jobs in all queues
Sidekiq::Client.registered_queues.each do |q|
Sidekiq.redis { |r| r.lrange "queue:#{q}", 0, -1 }
end


# Remove a queue and all of its jobs
Sidekiq.redis do |r|
r.srem "queues", "app_queue"
r.del  "queue:app_queue"
end

Unfortunately, removing a specific job is a little more difficult as you'd have to copy its exact value:

# Remove a specific job from a queue
Sidekiq.redis { |r| r.lrem "queue:app_queue", -1, "the payload string stored in Redis" }

You could do all of this even more easily via redis-cli :

$ redis-cli
> select 0 # (or whichever namespace Sidekiq is using)
> keys * # (just to get an idea of what you're working with)
> smembers queues
> lrange queues:app_queue 0 -1
> lrem queues:app_queue -1 "payload"

A workaround is to use the testing module (require 'sidekiq/testing') and to drain the worker (MyWorker.drain).

There is an ergonomic API for viewing and managing queues.

It is not required by default.

require 'sidekiq/api'

Here's the excerpt:

# get a handle to the default queue
default_queue = Sidekiq::Queue.new


# get a handle to the mailer queue
mailer_queue = Sidekiq::Queue.new("mailer")


# How many jobs are in the default queue?
default_queue.size # => 1001


# How many jobs are in the mailer queue?
mailer_queue.size # => 50


#Deletes all Jobs in a Queue, by removing the queue.
default_queue.clear

You can also get some summary statistics.

stats = Sidekiq::Stats.new


# Get the number of jobs that have been processed.
stats.processed # => 100


# Get the number of jobs that have failed.
stats.failed # => 3


# Get the queues with name and number enqueued.
stats.queues # => { "default" => 1001, "email" => 50 }


#Gets the number of jobs enqueued in all queues (does NOT include retries and scheduled jobs).
stats.enqueued # => 1051

There is a API for accessing real-time information about workers, queues and jobs.
Visit here https://github.com/mperham/sidekiq/wiki/API

There were hanged 'workers' in default queue and I was able to see them though web interface. But they weren't available from console if I used Sidekiq::Queue.new.size

irb(main):002:0> Sidekiq::Queue.new.size
2014-03-04T14:37:43Z 17256 TID-oujb9c974 INFO: Sidekiq client with redis options {:namespace=>"sidekiq_staging"}
=> 0

Using redis-cli I was able to find them

redis 127.0.0.1:6379> keys *
1) "sidekiq_staging:worker:ip-xxx-xxx-xxx-xxx:7635c39a29d7b255b564970bea51c026-69853672483440:default"
2) "sidekiq_staging:worker:ip-xxx-xxx-xxx-xxx:0cf585f5e93e1850eee1ae4613a08e45-70328697677500:default:started"
3) "sidekiq_staging:worker:ip-xxx-xxx-xxx-xxx:7635c39a29d7b255b564970bea51c026-69853672320140:default:started"
...

The solution was:

irb(main):003:0>  Sidekiq.redis { |r| r.del "workers", 0, -1 }
=> 1

Also in the Sidekiq v3 there is a command

Sidekiq::Workers.new.prune

But for some reason it didn't work for me that day

And if you want to clear the sidekiq retry queue, it's this: Sidekiq::RetrySet.new.clear

if there is any scheduled job. You may delete all the jobs using the following command:

Sidekiq::ScheduledSet.new.clear

if there any queues you wanted to delete all jobs you may use the following command:

  Sidekiq::Queue.new.clear

Retries Jobs can be removed by the following command also:

Sidekiq::RetrySet.new.clear

There are more information here at the following link, you may checkout: https://github.com/mperham/sidekiq/wiki/API

Rake task for clear all sidekiq queues:

namespace :sidekiq do
desc 'Clear sidekiq queue'
task clear: :environment do
require 'sidekiq/api'
Sidekiq::Queue.all.each(&:clear)
end
end

Usage:

rake sidekiq:clear

$ redis-cli
> select 0 # (or whichever namespace Sidekiq is using)
> keys * # (just to get an idea of what you're working with)
> smembers queues
> lrange queue:queue_name 0 -1 # (queue_name must be your relevant queue)
> lrem queue:queue_name -1 "payload"

This is not a direct solution for the Rails console, but for a quick monitoring of the Sidekiq task count and queue size, you can use sidekiqmon binary that ships with Sidekiq 6+:

$ sidekiqmon
Sidekiq 6.4.2
2022-07-25 11:05:56 UTC


---- Overview ----
Processed: 20,313,347
Failed: 57,120
Busy: 9
Enqueued: 17
Retries: 0
Scheduled: 37
Dead: 2,382


---- Processes (1) ----
36f993209f93:15:a498f85c6a12 [server]
Started: 2022-07-25 10:49:43 +0000 (16 minutes ago)
Threads: 10 (9 busy)
Queues: default, elasticsearch, statistics


---- Queues (3) ----
NAME             SIZE  LATENCY
default             0     0.00
elasticsearch      17     0.74
statistics          0     0.00