Add rake command to migrate archived traces from local storage to object storage

app/models/ci/build.rb

@@ -67,6 +67,10 @@ module Ci
         '', Ci::JobArtifact.select(1).where('ci_builds.id = ci_job_artifacts.job_id').archive)
     end
 
+    scope :with_archived_trace, ->() do
+      where('EXISTS (?)', Ci::JobArtifact.select(1).where('ci_builds.id = ci_job_artifacts.job_id').trace)
+    end
+
     scope :without_archived_trace, ->() do
       where('NOT EXISTS (?)', Ci::JobArtifact.select(1).where('ci_builds.id = ci_job_artifacts.job_id').trace)
     end
@@ -77,6 +81,7 @@ module Ci
     end
 
     scope :with_artifacts_stored_locally, -> { with_artifacts_archive.where(artifacts_file_store: [nil, LegacyArtifactUploader::Store::LOCAL]) }
+    scope :with_archived_trace_stored_locally, -> { with_archived_trace.where(artifacts_file_store: [nil, LegacyArtifactUploader::Store::LOCAL]) }
     scope :with_artifacts_not_expired, ->() { with_artifacts_archive.where('artifacts_expire_at IS NULL OR artifacts_expire_at > ?', Time.now) }
     scope :with_expired_artifacts, ->() { with_artifacts_archive.where('artifacts_expire_at < ?', Time.now) }
     scope :last_month, ->() { where('created_at > ?', Date.today - 1.month) }

changelogs/unreleased/add-rake-command-to-migrate-locally-persisted-archived-traces.yml

+---
+title: Add rake command to migrate archived traces from local storage to object storage
+merge_request: 21193
+author:
+type: added

doc/administration/job_traces.md

@@ -3,10 +3,6 @@
 Job traces are sent by GitLab Runner while it's processing a job. You can see
 traces in job pages, pipelines, email notifications, etc.
 
-There isn't a way to automatically expire old job logs, but it's safe to remove
-them if they're taking up too much space. If you remove the logs manually, the
-job output in the UI will be empty.
-
 ## Data flow
 
 In general, there are two states in job traces: "live trace" and "archived trace".
@@ -57,11 +53,55 @@ To change the location where the job logs will be stored, follow the steps below
 
 ## Uploading traces to object storage
 
-An archived trace is considered as a [job artifact](job_artifacts.md).
-Therefore, when you [set up an object storage](job_artifacts.md#object-storage-settings),
+Archived traces are considered as [job artifacts](job_artifacts.md).
+Therefore, when you [set up the object storage integration](job_artifacts.md#object-storage-settings),
 job traces are automatically migrated to it along with the other job artifacts.
 
-See [Data flow](#data-flow) to learn about the process.
+See "Phase 4: uploading" in [Data flow](#data-flow) to learn about the process.
+
+## How to archive legacy job trace files
+
+Legacy job traces, which were created before GitLab 10.5, were not archived regularly.
+It's the same state with the "2: overwriting" in the above [Data flow](#data-flow).
+To archive those legacy job traces, please follow the instruction below.
+
+1. Execute the following command
+
+      ```bash
+      gitlab-rake gitlab:traces:archive
+      ```
+
+      After you executed this task, GitLab instance queues up Sidekiq jobs (asynchronous processes)
+      for migrating job trace files from local storage to object storage. 
+      It could take time to complete the all migration jobs. You can check the progress by the following command
+
+      ```bash
+      sudo gitlab-rails console
+      ```
+
+      ```bash
+      [1] pry(main)> Sidekiq::Stats.new.queues['pipeline_background:archive_trace']
+      => 100
+      ```
+
+      If the count becomes zero, the archiving processes are done
+
+## How to migrate archived job traces to object storage
+
+If job traces have already been archived into local storage, and you want to migrate those traces to object storage, please follow the instruction below.
+
+1. Ensure [Object storage integration for Job Artifacts](job_artifacts.md#object-storage-settings) is enabled
+1. Execute the following command
+
+      ```bash
+      gitlab-rake gitlab:traces:migrate
+      ```
+
+## How to remove job traces
+
+There isn't a way to automatically expire old job logs, but it's safe to remove
+them if they're taking up too much space. If you remove the logs manually, the
+job output in the UI will be empty.
 
 ## New live trace architecture
 

lib/tasks/gitlab/traces.rake

@@ -18,5 +18,22 @@ namespace :gitlab do
         logger.info("Scheduled #{job_ids.count} jobs. From #{job_ids.min} to #{job_ids.max}")
       end
     end
+
+    task migrate: :environment do
+      logger = Logger.new(STDOUT)
+      logger.info('Starting transfer of job traces')
+
+      Ci::Build.joins(:project)
+        .with_archived_trace_stored_locally
+        .find_each(batch_size: 10) do |build|
+        begin
+          build.job_artifacts_trace.file.migrate!(ObjectStorage::Store::REMOTE)
+
+          logger.info("Transferred job trace of #{build.id} to object storage")
+        rescue => e
+          logger.error("Failed to transfer artifacts of #{build.id} with error: #{e.message}")
+        end
+      end
+    end
   end
 end

spec/tasks/gitlab/traces_rake_spec.rb

@@ -5,6 +5,7 @@ describe 'gitlab:traces rake tasks' do
     Rake.application.rake_require 'tasks/gitlab/traces'
   end
 
+  describe 'gitlab:traces:archive' do
     shared_examples 'passes the job id to worker' do
       it do
         expect(ArchiveTraceWorker).to receive(:bulk_perform_async).with([[job.id]])
@@ -52,4 +53,61 @@ describe 'gitlab:traces rake tasks' do
 
       it_behaves_like 'does not pass the job id to worker'
     end
+  end
+
+  describe 'gitlab:traces:migrate' do
+    let(:object_storage_enabled) { false }
+
+    before do
+      stub_artifacts_object_storage(enabled: object_storage_enabled)
+    end
+
+    subject { run_rake_task('gitlab:traces:migrate') }
+
+    let!(:job_trace) { create(:ci_job_artifact, :trace, file_store: store) }
+
+    context 'when local storage is used' do
+      let(:store) { ObjectStorage::Store::LOCAL }
+
+      context 'and job does not have file store defined' do
+        let(:object_storage_enabled) { true }
+        let(:store) { nil }
+
+        it "migrates file to remote storage" do
+          subject
+
+          expect(job_trace.reload.file_store).to eq(ObjectStorage::Store::REMOTE)
+        end
+      end
+
+      context 'and remote storage is defined' do
+        let(:object_storage_enabled) { true }
+
+        it "migrates file to remote storage" do
+          subject
+
+          expect(job_trace.reload.file_store).to eq(ObjectStorage::Store::REMOTE)
+        end
+      end
+
+      context 'and remote storage is not defined' do
+        it "fails to migrate to remote storage" do
+          subject
+
+          expect(job_trace.reload.file_store).to eq(ObjectStorage::Store::LOCAL)
+        end
+      end
+    end
+
+    context 'when remote storage is used' do
+      let(:object_storage_enabled) { true }
+      let(:store) { ObjectStorage::Store::REMOTE }
+
+      it "file stays on remote storage" do
+        subject
+
+        expect(job_trace.reload.file_store).to eq(ObjectStorage::Store::REMOTE)
+      end
+    end
+  end
 end