Integrate two workers into one ArchiveTraceWorker with pipeline_background queue. This queue takes loqer precedence than pipeline_default.

app/workers/all_queues.yml

@@ -43,9 +43,9 @@
 - pipeline_cache:expire_pipeline_cache
 - pipeline_creation:create_pipeline
 - pipeline_creation:run_pipeline_schedule
+- pipeline_background:archive_trace
 - pipeline_default:build_coverage
 - pipeline_default:build_trace_sections
-- pipeline_default:create_trace_artifact
 - pipeline_default:pipeline_metrics
 - pipeline_default:pipeline_notification
 - pipeline_default:update_head_pipeline_for_merge_request
@@ -62,8 +62,6 @@
 - repository_check:repository_check_clear
 - repository_check:repository_check_single_repository
 
-- object_storage:archive_legacy_trace
-
 - default
 - mailers # ActionMailer::DeliveryJob.queue_name
 

app/workers/archive_legacy_trace_worker.rb

@@ -1,10 +0,0 @@
-class ArchiveLegacyTraceWorker
-  include ApplicationWorker
-  include ObjectStorageQueue
-
-  def perform(job_id)
-    Ci::Build.find_by(id: job_id).try do |job|
-      job.trace.archive!
-    end
-  end
-end

app/workers/archive_trace_worker.rb

@@ -1,6 +1,6 @@
-class CreateTraceArtifactWorker
+class ArchiveTraceWorker
   include ApplicationWorker
-  include PipelineQueue
+  include PipelineBackgroundQueue
 
   def perform(job_id)
     Ci::Build.find_by(id: job_id).try do |job|

app/workers/build_finished_worker.rb

@@ -12,7 +12,7 @@ class BuildFinishedWorker
 
       # We execute that async as this are two indepentent operations that can be executed after TraceSections and Coverage
       BuildHooksWorker.perform_async(build.id)
-      CreateTraceArtifactWorker.perform_async(build.id)
+      ArchiveTraceWorker.perform_async(build.id)
     end
   end
 end

app/workers/concerns/pipeline_background_queue.rb

@@ -0,0 +1,10 @@
+##
+# Concern for setting Sidekiq settings for the low priority CI pipeline workers.
+#
+module PipelineBackgroundQueue
+  extend ActiveSupport::Concern
+
+  included do
+    queue_namespace :pipeline_background
+  end
+end

config/sidekiq_queues.yml

@@ -69,4 +69,4 @@
   - [storage_migrator, 1]
   - [pages_domain_verification, 1]
   - [plugin, 1]
-  - [object_storage, 1]
+  - [pipeline_background, 1]

db/post_migrate/20180306074045_migrate_create_trace_artifact_sidekiq_queue.rb

@@ -0,0 +1,13 @@
+class MigrateCreateTraceArtifactSidekiqQueue < ActiveRecord::Migration
+  include Gitlab::Database::MigrationHelpers
+
+  DOWNTIME = false
+
+  def up
+    sidekiq_queue_migrate 'pipeline_default:create_trace_artifact', to: 'pipeline_background:archive_trace'
+  end
+
+  def down
+    sidekiq_queue_migrate 'pipeline_background:archive_trace', to: 'pipeline_default:create_trace_artifact'
+  end
+end

db/schema.rb

@@ -11,7 +11,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 20180305144721) do
+ActiveRecord::Schema.define(version: 20180306074045) do
 
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"

lib/tasks/gitlab/traces.rake

@@ -15,7 +15,7 @@ namespace :gitlab do
         .find_in_batches(batch_size: 1000) do |jobs|
         job_ids = jobs.map { |job| [job.id] }
 
-        ArchiveLegacyTraceWorker.bulk_perform_async(job_ids)
+        ArchiveTraceWorker.bulk_perform_async(job_ids)
 
         logger.info("Scheduled #{job_ids.count} jobs. From #{job_ids.min} to #{job_ids.max}")
       end

spec/migrations/migrate_create_trace_artifact_sidekiq_queue.rb

@@ -0,0 +1,66 @@
+require 'spec_helper'
+require Rails.root.join('db', 'post_migrate', '20180306074045_migrate_create_trace_artifact_sidekiq_queue.rb')
+
+describe MigrateCreateTraceArtifactSidekiqQueue, :sidekiq, :redis do
+  include Gitlab::Database::MigrationHelpers
+
+  context 'when there are jobs in the queues' do
+    it 'correctly migrates queue when migrating up' do
+      Sidekiq::Testing.disable! do
+        stubbed_worker(queue: 'pipeline_default:create_trace_artifact').perform_async('Something', [1])
+        stubbed_worker(queue: 'pipeline_background:archive_trace').perform_async('Something', [1])
+
+        described_class.new.up
+
+        expect(sidekiq_queue_length('pipeline_default:create_trace_artifact')).to eq 0
+        expect(sidekiq_queue_length('pipeline_background:archive_trace')).to eq 2
+      end
+    end
+
+    it 'does not affect other queues under the same namespace' do
+      Sidekiq::Testing.disable! do
+        stubbed_worker(queue: 'pipeline_default:build_coverage').perform_async('Something', [1])
+        stubbed_worker(queue: 'pipeline_default:build_trace_sections').perform_async('Something', [1])
+        stubbed_worker(queue: 'pipeline_default:pipeline_metrics').perform_async('Something', [1])
+        stubbed_worker(queue: 'pipeline_default:pipeline_notification').perform_async('Something', [1])
+        stubbed_worker(queue: 'pipeline_default:update_head_pipeline_for_merge_request').perform_async('Something', [1])
+
+        described_class.new.up
+
+        expect(sidekiq_queue_length('pipeline_default:build_coverage')).to eq 1
+        expect(sidekiq_queue_length('pipeline_default:build_trace_sections')).to eq 1
+        expect(sidekiq_queue_length('pipeline_default:pipeline_metrics')).to eq 1
+        expect(sidekiq_queue_length('pipeline_default:pipeline_notification')).to eq 1
+        expect(sidekiq_queue_length('pipeline_default:update_head_pipeline_for_merge_request')).to eq 1
+      end
+    end
+
+    it 'correctly migrates queue when migrating down' do
+      Sidekiq::Testing.disable! do
+        stubbed_worker(queue: 'pipeline_background:archive_trace').perform_async('Something', [1])
+
+        described_class.new.down
+
+        expect(sidekiq_queue_length('pipeline_default:create_trace_artifact')).to eq 1
+        expect(sidekiq_queue_length('pipeline_background:archive_trace')).to eq 0
+      end
+    end
+  end
+
+  context 'when there are no jobs in the queues' do
+    it 'does not raise error when migrating up' do
+      expect { described_class.new.up }.not_to raise_error
+    end
+
+    it 'does not raise error when migrating down' do
+      expect { described_class.new.down }.not_to raise_error
+    end
+  end
+
+  def stubbed_worker(queue:)
+    Class.new do
+      include Sidekiq::Worker
+      sidekiq_options queue: queue
+    end
+  end
+end

spec/workers/concerns/pipeline_background_queue_spec.rb

@@ -0,0 +1,19 @@
+require 'spec_helper'
+
+describe PipelineBackgroundQueue do
+  let(:worker) do
+    Class.new do
+      def self.name
+        'DummyWorker'
+      end
+
+      include ApplicationWorker
+      include PipelineBackgroundQueue
+    end
+  end
+
+  it 'sets a default object storage queue automatically' do
+    expect(worker.sidekiq_options['queue'])
+      .to eq 'object_storage:dummy'
+  end
+end