Move clearing stale builders to worker

app/controllers/api/v1/jobs_controller.rb

@@ -8,7 +8,6 @@ class Api::V1::JobsController < Api::V1::BaseController
   skip_after_action :verify_authorized
 
   def shift
-    clear_stale_builders
     job_shift_sem = Redis::Semaphore.new(:job_shift_lock)
     job_shift_sem.lock
     uid = BuildList.scoped_to_arch(arch_ids).
@@ -100,14 +99,6 @@ class Api::V1::JobsController < Api::V1::BaseController
 
   protected
 
-  def clear_stale_builders
-    BuildList.transaction do
-      BuildList.where(["updated_at < ?", 900.seconds.ago]).where(status: BuildList::BUILD_PENDING).where.not(builder: nil).find_each(batch_size: 50) do |bl|
-        bl.update_column(:builder_id, nil)
-      end
-    end
-  end
-
   def platform_ids
     @platform_ids ||= begin
       platforms = params[:platforms].to_s.split(',')

app/jobs/build_lists/clear_stale_builders.rb

@@ -0,0 +1,10 @@
+module BuildLists
+  class ClearStaleBuilders < BaseActiveRecordJob
+    include Sidekiq::Worker
+    sidekiq_options :queue => :low
+
+    def perform_with_ar_connection
+      BuildList.where(["updated_at < ?", 900.seconds.ago]).where(status: BuildList::BUILD_PENDING).where.not(builder: nil).update_all(builder_id: nil)
+    end
+  end
+end

config/schedule.yml

@@ -69,3 +69,10 @@ build_canceling_destroy:
   class: 'BuildLists::BuildCancelingDestroyJob'
   queue: low
   description: 'Remove build canceling build lists'
+
+clear_stale_builders:
+  every:
+    - '5m'
+  class: 'BuildLists::ClearStaleBuilders'
+  queue: low
+  description: 'Clear stale builders'