Merge branch 'add-background-migration-for-legacy-traces' into 'master'

Migrate job artifacts data from `ci_builds` to `ci_job_artifacts` table (with Background migrations)

Closes #46652

See merge request gitlab-org/gitlab-ce!18615

12 files changed, 506 insertions, 3 deletions

diff --git a/app/models/ci/job_artifact.rb b/app/models/ci/job_artifact.rb
index 17b7ee4f07e..32d7cb3424e 100644
--- a/app/models/ci/job_artifact.rb
+++ b/app/models/ci/job_artifact.rb
@@ -48,6 +48,20 @@ module Ci
       gzip: 3
     }
 
+    # `file_location` indicates where actual files are stored.
+    # Ideally, actual files should be stored in the same directory, and use the same
+    # convention to generate its path. However, sometimes we can't do so due to backward-compatibility.
+    #
+    # legacy_path ... The actual file is stored at a path consists of a timestamp
+    #                 and raw project/model IDs. Those rows were migrated from
+    #                 `ci_builds.artifacts_file` and `ci_builds.artifacts_metadata`
+    # hashed_path ... The actual file is stored at a path consists of a SHA2 based on the project ID.
+    #                 This is the default value.
+    enum file_location: {
+      legacy_path: 1,
+      hashed_path: 2
+    }
+
     FILE_FORMAT_ADAPTERS = {
       gzip: Gitlab::Ci::Build::Artifacts::GzipFileAdapter
     }.freeze
@@ -72,6 +86,10 @@ module Ci
       [nil, ::JobArtifactUploader::Store::LOCAL].include?(self.file_store)
     end
 
+    def hashed_path?
+      super || self.file_location.nil?
+    end
+
     def expire_in
       expire_at - Time.now if expire_at
     end
@@ -108,7 +126,7 @@ module Ci
     end
 
     def update_project_statistics_after_destroy
-      update_project_statistics(-self.size)
+      update_project_statistics(-self.size.to_i)
     end
 
     def update_project_statistics(difference)
diff --git a/app/uploaders/job_artifact_uploader.rb b/app/uploaders/job_artifact_uploader.rb
index f6af023e0f9..557b13a8bd6 100644
--- a/app/uploaders/job_artifact_uploader.rb
+++ b/app/uploaders/job_artifact_uploader.rb
@@ -5,6 +5,7 @@ class JobArtifactUploader < GitlabUploader
   include ObjectStorage::Concern
 
   ObjectNotReadyError = Class.new(StandardError)
+  UnknownFileLocationError = Class.new(StandardError)
 
   storage_options Gitlab.config.artifacts
 
@@ -23,10 +24,22 @@ class JobArtifactUploader < GitlabUploader
   def dynamic_segment
     raise ObjectNotReadyError, 'JobArtifact is not ready' unless model.id
 
-    creation_date = model.created_at.utc.strftime('%Y_%m_%d')
+    if model.hashed_path?
+      hashed_path
+    elsif model.legacy_path?
+      legacy_path
+    else
+      raise UnknownFileLocationError
+    end
+  end
 
+  def hashed_path
     File.join(disk_hash[0..1], disk_hash[2..3], disk_hash,
-              creation_date, model.job_id.to_s, model.id.to_s)
+      model.created_at.utc.strftime('%Y_%m_%d'), model.job_id.to_s, model.id.to_s)
+  end
+
+  def legacy_path
+    File.join(model.created_at.utc.strftime('%Y_%m'), model.project_id.to_s, model.job_id.to_s)
   end
 
   def disk_hash
diff --git a/changelogs/unreleased/add-background-migration-for-legacy-traces.yml b/changelogs/unreleased/add-background-migration-for-legacy-traces.yml
new file mode 100644
index 00000000000..3d5a0b4e452
--- /dev/null
+++ b/changelogs/unreleased/add-background-migration-for-legacy-traces.yml
@@ -0,0 +1,5 @@
+---
+title: Add background migrations for legacy artifacts
+merge_request: 18615
+author:
+type: performance
diff --git a/db/migrate/20180815160409_add_file_location_to_ci_job_artifacts.rb b/db/migrate/20180815160409_add_file_location_to_ci_job_artifacts.rb
new file mode 100644
index 00000000000..620342005fe
--- /dev/null
+++ b/db/migrate/20180815160409_add_file_location_to_ci_job_artifacts.rb
@@ -0,0 +1,9 @@
+class AddFileLocationToCiJobArtifacts < ActiveRecord::Migration
+  include Gitlab::Database::MigrationHelpers
+
+  DOWNTIME = false
+
+  def change
+    add_column :ci_job_artifacts, :file_location, :integer, limit: 2
+  end
+end
diff --git a/db/migrate/20180815170510_add_partial_index_to_ci_builds_artifacts_file.rb b/db/migrate/20180815170510_add_partial_index_to_ci_builds_artifacts_file.rb
new file mode 100644
index 00000000000..5e041ea6559
--- /dev/null
+++ b/db/migrate/20180815170510_add_partial_index_to_ci_builds_artifacts_file.rb
@@ -0,0 +1,16 @@
+class AddPartialIndexToCiBuildsArtifactsFile < ActiveRecord::Migration
+  include Gitlab::Database::MigrationHelpers
+
+  DOWNTIME = false
+  INDEX_NAME = 'partial_index_ci_builds_on_id_with_legacy_artifacts'.freeze
+
+  disable_ddl_transaction!
+
+  def up
+    add_concurrent_index(:ci_builds, :id, where: "artifacts_file <> ''", name: INDEX_NAME)
+  end
+
+  def down
+    remove_concurrent_index_by_name(:ci_builds, INDEX_NAME)
+  end
+end
diff --git a/db/post_migrate/20180816161409_migrate_legacy_artifacts_to_job_artifacts.rb b/db/post_migrate/20180816161409_migrate_legacy_artifacts_to_job_artifacts.rb
new file mode 100644
index 00000000000..2dd711e9c10
--- /dev/null
+++ b/db/post_migrate/20180816161409_migrate_legacy_artifacts_to_job_artifacts.rb
@@ -0,0 +1,32 @@
+class MigrateLegacyArtifactsToJobArtifacts < ActiveRecord::Migration
+  include Gitlab::Database::MigrationHelpers
+
+  DOWNTIME = false
+  MIGRATION = 'MigrateLegacyArtifacts'.freeze
+  BATCH_SIZE = 100
+
+  disable_ddl_transaction!
+
+  class Build < ActiveRecord::Base
+    include EachBatch
+
+    self.table_name = 'ci_builds'
+    self.inheritance_column = :_type_disabled
+
+    scope :with_legacy_artifacts, -> { where("artifacts_file <> ''") }
+  end
+
+  def up
+    MigrateLegacyArtifactsToJobArtifacts::Build
+      .with_legacy_artifacts.tap do |relation|
+      queue_background_migration_jobs_by_range_at_intervals(relation,
+                                                            MIGRATION,
+                                                            5.minutes,
+                                                            batch_size: BATCH_SIZE)
+    end
+  end
+
+  def down
+    # no-op
+  end
+end
diff --git a/db/schema.rb b/db/schema.rb
index 02e545bec7d..56c7265119d 100644
--- a/db/schema.rb
+++ b/db/schema.rb
@@ -342,6 +342,7 @@ ActiveRecord::Schema.define(version: 20180826111825) do
   add_index "ci_builds", ["commit_id", "status", "type"], name: "index_ci_builds_on_commit_id_and_status_and_type", using: :btree
   add_index "ci_builds", ["commit_id", "type", "name", "ref"], name: "index_ci_builds_on_commit_id_and_type_and_name_and_ref", using: :btree
   add_index "ci_builds", ["commit_id", "type", "ref"], name: "index_ci_builds_on_commit_id_and_type_and_ref", using: :btree
+  add_index "ci_builds", ["id"], name: "partial_index_ci_builds_on_id_with_legacy_artifacts", where: "(artifacts_file <> ''::text)", using: :btree
   add_index "ci_builds", ["project_id", "id"], name: "index_ci_builds_on_project_id_and_id", using: :btree
   add_index "ci_builds", ["protected"], name: "index_ci_builds_on_protected", using: :btree
   add_index "ci_builds", ["runner_id"], name: "index_ci_builds_on_runner_id", using: :btree
@@ -397,6 +398,7 @@ ActiveRecord::Schema.define(version: 20180826111825) do
     t.string "file"
     t.binary "file_sha256"
     t.integer "file_format", limit: 2
+    t.integer "file_location", limit: 2
   end
 
   add_index "ci_job_artifacts", ["expire_at", "job_id"], name: "index_ci_job_artifacts_on_expire_at_and_job_id", using: :btree
diff --git a/lib/gitlab/background_migration/migrate_legacy_artifacts.rb b/lib/gitlab/background_migration/migrate_legacy_artifacts.rb
new file mode 100644
index 00000000000..5cd638083b0
--- /dev/null
+++ b/lib/gitlab/background_migration/migrate_legacy_artifacts.rb
@@ -0,0 +1,126 @@
+# frozen_string_literal: true
+# rubocop:disable Metrics/ClassLength
+
+module Gitlab
+  module BackgroundMigration
+    ##
+    # The class to migrate job artifacts from `ci_builds` to `ci_job_artifacts`
+    class MigrateLegacyArtifacts
+      FILE_LOCAL_STORE = 1 # equal to ObjectStorage::Store::LOCAL
+      ARCHIVE_FILE_TYPE = 1 # equal to Ci::JobArtifact.file_types['archive']
+      METADATA_FILE_TYPE = 2 # equal to Ci::JobArtifact.file_types['metadata']
+      LEGACY_PATH_FILE_LOCATION = 1 # equal to Ci::JobArtifact.file_location['legacy_path']
+
+      def perform(start_id, stop_id)
+        ActiveRecord::Base.transaction do
+          insert_archives(start_id, stop_id)
+          insert_metadatas(start_id, stop_id)
+          delete_legacy_artifacts(start_id, stop_id)
+        end
+      end
+
+      private
+
+      def insert_archives(start_id, stop_id)
+        ActiveRecord::Base.connection.execute <<~SQL
+          INSERT INTO
+              ci_job_artifacts (
+                  project_id,
+                  job_id,
+                  expire_at,
+                  file_location,
+                  created_at,
+                  updated_at,
+                  file,
+                  size,
+                  file_store,
+                  file_type
+              )
+          SELECT
+              project_id,
+              id,
+              artifacts_expire_at,
+              #{LEGACY_PATH_FILE_LOCATION},
+              created_at,
+              created_at,
+              artifacts_file,
+              artifacts_size,
+              COALESCE(artifacts_file_store, #{FILE_LOCAL_STORE}),
+              #{ARCHIVE_FILE_TYPE}
+          FROM
+              ci_builds
+          WHERE
+              id BETWEEN #{start_id.to_i} AND #{stop_id.to_i}
+              AND artifacts_file <> ''
+              AND NOT EXISTS (
+                  SELECT
+                      1
+                  FROM
+                      ci_job_artifacts
+                  WHERE
+                      ci_builds.id = ci_job_artifacts.job_id
+                      AND ci_job_artifacts.file_type = #{ARCHIVE_FILE_TYPE})
+        SQL
+      end
+
+      def insert_metadatas(start_id, stop_id)
+        ActiveRecord::Base.connection.execute <<~SQL
+          INSERT INTO
+              ci_job_artifacts (
+                  project_id,
+                  job_id,
+                  expire_at,
+                  file_location,
+                  created_at,
+                  updated_at,
+                  file,
+                  size,
+                  file_store,
+                  file_type
+              )
+          SELECT
+              project_id,
+              id,
+              artifacts_expire_at,
+              #{LEGACY_PATH_FILE_LOCATION},
+              created_at,
+              created_at,
+              artifacts_metadata,
+              NULL,
+              COALESCE(artifacts_metadata_store, #{FILE_LOCAL_STORE}),
+              #{METADATA_FILE_TYPE}
+          FROM
+              ci_builds
+          WHERE
+              id BETWEEN #{start_id.to_i} AND #{stop_id.to_i}
+              AND artifacts_file <> ''
+              AND artifacts_metadata <> ''
+              AND NOT EXISTS (
+                  SELECT
+                      1
+                  FROM
+                      ci_job_artifacts
+                  WHERE
+                      ci_builds.id = ci_job_artifacts.job_id
+                      AND ci_job_artifacts.file_type = #{METADATA_FILE_TYPE})
+        SQL
+      end
+
+      def delete_legacy_artifacts(start_id, stop_id)
+        ActiveRecord::Base.connection.execute <<~SQL
+          UPDATE
+              ci_builds
+          SET
+              artifacts_file = NULL,
+              artifacts_file_store = NULL,
+              artifacts_size = NULL,
+              artifacts_metadata = NULL,
+              artifacts_metadata_store = NULL
+          WHERE
+              id BETWEEN #{start_id.to_i} AND #{stop_id.to_i}
+              AND artifacts_file <> ''
+        SQL
+      end
+    end
+  end
+end
diff --git a/spec/factories/ci/job_artifacts.rb b/spec/factories/ci/job_artifacts.rb
index 46aaaf6aa5d..f028803ca74 100644
--- a/spec/factories/ci/job_artifacts.rb
+++ b/spec/factories/ci/job_artifacts.rb
@@ -24,6 +24,12 @@ FactoryBot.define do
       end
     end
 
+    trait :legacy_archive do
+      archive
+
+      file_location :legacy_path
+    end
+
     trait :metadata do
       file_type :metadata
       file_format :gzip
diff --git a/spec/lib/gitlab/background_migration/migrate_legacy_artifacts_spec.rb b/spec/lib/gitlab/background_migration/migrate_legacy_artifacts_spec.rb
new file mode 100644
index 00000000000..2d1505dacfe
--- /dev/null
+++ b/spec/lib/gitlab/background_migration/migrate_legacy_artifacts_spec.rb
@@ -0,0 +1,156 @@
+require 'spec_helper'
+
+describe Gitlab::BackgroundMigration::MigrateLegacyArtifacts, :migration, schema: 20180816161409 do
+  let(:namespaces) { table(:namespaces) }
+  let(:projects) { table(:projects) }
+  let(:pipelines) { table(:ci_pipelines) }
+  let(:jobs) { table(:ci_builds) }
+  let(:job_artifacts) { table(:ci_job_artifacts) }
+
+  subject { described_class.new.perform(*range) }
+
+  context 'when a pipeline exists' do
+    let!(:namespace) { namespaces.create!(name: 'gitlab', path: 'gitlab-org') }
+    let!(:project) { projects.create!(name: 'gitlab', path: 'gitlab-ce', namespace_id: namespace.id) }
+    let!(:pipeline) { pipelines.create!(project_id: project.id, ref: 'master', sha: 'adf43c3a') }
+
+    context 'when a legacy artifacts exists' do
+      let(:artifacts_expire_at) { 1.day.since.to_s }
+      let(:file_store) { ::ObjectStorage::Store::REMOTE }
+
+      let!(:job) do
+        jobs.create!(
+          commit_id: pipeline.id,
+          project_id: project.id,
+          status: :success,
+          **artifacts_archive_attributes,
+          **artifacts_metadata_attributes)
+      end
+
+      let(:artifacts_archive_attributes) do
+        {
+          artifacts_file: 'archive.zip',
+          artifacts_file_store: file_store,
+          artifacts_size: 123,
+          artifacts_expire_at: artifacts_expire_at
+        }
+      end
+
+      let(:artifacts_metadata_attributes) do
+        {
+          artifacts_metadata: 'metadata.gz',
+          artifacts_metadata_store: file_store
+        }
+      end
+
+      it 'has legacy artifacts' do
+        expect(jobs.pluck('artifacts_file, artifacts_file_store, artifacts_size, artifacts_expire_at')).to eq([artifacts_archive_attributes.values])
+        expect(jobs.pluck('artifacts_metadata, artifacts_metadata_store')).to eq([artifacts_metadata_attributes.values])
+      end
+
+      it 'does not have new artifacts yet' do
+        expect(job_artifacts.count).to be_zero
+      end
+
+      context 'when the record exists inside of the range of a background migration' do
+        let(:range) { [job.id, job.id] }
+
+        it 'migrates a legacy artifact to ci_job_artifacts table' do
+          expect { subject }.to change { job_artifacts.count }.by(2)
+
+          expect(job_artifacts.order(:id).pluck('project_id, job_id, file_type, file_store, size, expire_at, file, file_sha256, file_location'))
+            .to eq([[project.id,
+                     job.id,
+                     described_class::ARCHIVE_FILE_TYPE,
+                     file_store,
+                     artifacts_archive_attributes[:artifacts_size],
+                     artifacts_expire_at,
+                     'archive.zip',
+                     nil,
+                     described_class::LEGACY_PATH_FILE_LOCATION],
+                    [project.id,
+                     job.id,
+                     described_class::METADATA_FILE_TYPE,
+                     file_store,
+                     nil,
+                     artifacts_expire_at,
+                     'metadata.gz',
+                     nil,
+                     described_class::LEGACY_PATH_FILE_LOCATION]])
+
+          expect(jobs.pluck('artifacts_file, artifacts_file_store, artifacts_size, artifacts_expire_at')).to eq([[nil, nil, nil, artifacts_expire_at]])
+          expect(jobs.pluck('artifacts_metadata, artifacts_metadata_store')).to eq([[nil, nil]])
+        end
+
+        context 'when file_store is nil' do
+          let(:file_store) { nil }
+
+          it 'has nullified file_store in all legacy artifacts' do
+            expect(jobs.pluck('artifacts_file_store, artifacts_metadata_store')).to eq([[nil, nil]])
+          end
+
+          it 'fills file_store by the value of local file store' do
+            subject
+
+            expect(job_artifacts.pluck('file_store')).to all(eq(::ObjectStorage::Store::LOCAL))
+          end
+        end
+
+        context 'when new artifacts has already existed' do
+          context 'when only archive.zip existed' do
+            before do
+              job_artifacts.create!(project_id: project.id, job_id: job.id, file_type: described_class::ARCHIVE_FILE_TYPE, size: 999, file: 'archive.zip')
+            end
+
+            it 'had archive.zip already' do
+              expect(job_artifacts.exists?(job_id: job.id, file_type: described_class::ARCHIVE_FILE_TYPE)).to be_truthy
+            end
+
+            it 'migrates metadata' do
+              expect { subject }.to change { job_artifacts.count }.by(1)
+
+              expect(job_artifacts.exists?(job_id: job.id, file_type: described_class::METADATA_FILE_TYPE)).to be_truthy
+            end
+          end
+
+          context 'when both archive and metadata existed' do
+            before do
+              job_artifacts.create!(project_id: project.id, job_id: job.id, file_type: described_class::ARCHIVE_FILE_TYPE, size: 999, file: 'archive.zip')
+              job_artifacts.create!(project_id: project.id, job_id: job.id, file_type: described_class::METADATA_FILE_TYPE, size: 999, file: 'metadata.zip')
+            end
+
+            it 'does not migrate' do
+              expect { subject }.not_to change { job_artifacts.count }
+            end
+          end
+        end
+      end
+
+      context 'when the record exists outside of the range of a background migration' do
+        let(:range) { [job.id + 1, job.id + 1] }
+
+        it 'does not migrate' do
+          expect { subject }.not_to change { job_artifacts.count }
+        end
+      end
+    end
+
+    context 'when the job does not have legacy artifacts' do
+      let!(:job) { jobs.create!(commit_id: pipeline.id, project_id: project.id, status: :success) }
+
+      it 'does not have the legacy artifacts in database' do
+        expect(jobs.count).to eq(1)
+        expect(jobs.pluck('artifacts_file, artifacts_file_store, artifacts_size, artifacts_expire_at')).to eq([[nil, nil, nil, nil]])
+        expect(jobs.pluck('artifacts_metadata, artifacts_metadata_store')).to eq([[nil, nil]])
+      end
+
+      context 'when the record exists inside of the range of a background migration' do
+        let(:range) { [job.id, job.id] }
+
+        it 'does not migrate' do
+          expect { subject }.not_to change { job_artifacts.count }
+        end
+      end
+    end
+  end
+end
diff --git a/spec/migrations/migrate_legacy_artifacts_to_job_artifacts_spec.rb b/spec/migrations/migrate_legacy_artifacts_to_job_artifacts_spec.rb
new file mode 100644
index 00000000000..df82672f254
--- /dev/null
+++ b/spec/migrations/migrate_legacy_artifacts_to_job_artifacts_spec.rb
@@ -0,0 +1,73 @@
+require 'spec_helper'
+require Rails.root.join('db', 'post_migrate', '20180816161409_migrate_legacy_artifacts_to_job_artifacts.rb')
+
+describe MigrateLegacyArtifactsToJobArtifacts, :migration, :sidekiq do
+  let(:migration_class) { Gitlab::BackgroundMigration::MigrateLegacyArtifacts }
+  let(:migration_name)  { migration_class.to_s.demodulize }
+
+  let(:namespaces) { table(:namespaces) }
+  let(:projects) { table(:projects) }
+  let(:pipelines) { table(:ci_pipelines) }
+  let(:jobs) { table(:ci_builds) }
+  let(:job_artifacts) { table(:ci_job_artifacts) }
+  let(:namespace) { namespaces.create!(name: 'gitlab', path: 'gitlab-org') }
+  let(:project) { projects.create!(name: 'gitlab', path: 'gitlab-ce', namespace_id: namespace.id) }
+  let(:pipeline) { pipelines.create!(project_id: project.id, ref: 'master', sha: 'adf43c3a') }
+  let(:archive_file_type) { Gitlab::BackgroundMigration::MigrateLegacyArtifacts::ARCHIVE_FILE_TYPE }
+  let(:metadata_file_type) { Gitlab::BackgroundMigration::MigrateLegacyArtifacts::METADATA_FILE_TYPE }
+  let(:local_store) { ::ObjectStorage::Store::LOCAL }
+  let(:remote_store) { ::ObjectStorage::Store::REMOTE }
+  let(:legacy_location) { Gitlab::BackgroundMigration::MigrateLegacyArtifacts::LEGACY_PATH_FILE_LOCATION }
+
+  context 'when legacy artifacts exist' do
+    before do
+      jobs.create!(id: 1, commit_id: pipeline.id, project_id: project.id, status: :success, artifacts_file: 'archive.zip')
+      jobs.create!(id: 2, commit_id: pipeline.id, project_id: project.id, status: :failed, artifacts_metadata: 'metadata.gz')
+      jobs.create!(id: 3, commit_id: pipeline.id, project_id: project.id, status: :failed, artifacts_file: 'archive.zip', artifacts_metadata: 'metadata.gz')
+      jobs.create!(id: 4, commit_id: pipeline.id, project_id: project.id, status: :running)
+      jobs.create!(id: 5, commit_id: pipeline.id, project_id: project.id, status: :success, artifacts_file: 'archive.zip', artifacts_file_store: remote_store, artifacts_metadata: 'metadata.gz')
+      jobs.create!(id: 6, commit_id: pipeline.id, project_id: project.id, status: :failed, artifacts_file: 'archive.zip', artifacts_metadata: 'metadata.gz')
+    end
+
+    it 'schedules a background migration' do
+      Sidekiq::Testing.fake! do
+        Timecop.freeze do
+          migrate!
+
+          expect(migration_name).to be_scheduled_delayed_migration(5.minutes, 1, 6)
+          expect(BackgroundMigrationWorker.jobs.size).to eq 1
+        end
+      end
+    end
+
+    it 'migrates legacy artifacts to ci_job_artifacts table' do
+      migrate!
+
+      expect(job_artifacts.order(:job_id, :file_type).pluck('project_id, job_id, file_type, file_store, size, expire_at, file, file_sha256, file_location'))
+        .to eq([[project.id, 1, archive_file_type, local_store, nil, nil, 'archive.zip', nil, legacy_location],
+                [project.id, 3, archive_file_type, local_store, nil, nil, 'archive.zip', nil, legacy_location],
+                [project.id, 3, metadata_file_type, local_store, nil, nil, 'metadata.gz', nil, legacy_location],
+                [project.id, 5, archive_file_type, remote_store, nil, nil, 'archive.zip', nil, legacy_location],
+                [project.id, 5, metadata_file_type, local_store, nil, nil, 'metadata.gz', nil, legacy_location],
+                [project.id, 6, archive_file_type, local_store, nil, nil, 'archive.zip', nil, legacy_location],
+                [project.id, 6, metadata_file_type, local_store, nil, nil, 'metadata.gz', nil, legacy_location]])
+    end
+  end
+
+  context 'when legacy artifacts do not exist' do
+    before do
+      jobs.create!(id: 1, commit_id: pipeline.id, project_id: project.id, status: :success)
+      jobs.create!(id: 2, commit_id: pipeline.id, project_id: project.id, status: :failed, artifacts_metadata: 'metadata.gz')
+    end
+
+    it 'does not schedule background migrations' do
+      Sidekiq::Testing.fake! do
+        Timecop.freeze do
+          migrate!
+
+          expect(BackgroundMigrationWorker.jobs.size).to eq 0
+        end
+      end
+    end
+  end
+end
diff --git a/spec/uploaders/job_artifact_uploader_spec.rb b/spec/uploaders/job_artifact_uploader_spec.rb
index 3ad5fe7e3b3..061432f082a 100644
--- a/spec/uploaders/job_artifact_uploader_spec.rb
+++ b/spec/uploaders/job_artifact_uploader_spec.rb
@@ -40,6 +40,53 @@ describe JobArtifactUploader do
     it { is_expected.to end_with("ci_build_artifacts.zip") }
   end
 
+  describe '#dynamic_segment' do
+    let(:uploaded_content) { File.binread(Rails.root + 'spec/fixtures/ci_build_artifacts.zip') }
+    let(:model) { uploader.model }
+
+    shared_examples_for 'Read file from legacy path' do
+      it 'store_path returns the legacy path' do
+        expect(model.file.store_path).to eq(File.join(model.created_at.utc.strftime('%Y_%m'), model.project_id.to_s, model.job_id.to_s, 'ci_build_artifacts.zip'))
+      end
+
+      it 'has exactly the same content' do
+        expect(::File.binread(model.file.path)).to eq(uploaded_content)
+      end
+    end
+
+    shared_examples_for 'Read file from hashed path' do
+      it 'store_path returns hashed path' do
+        expect(model.file.store_path).to eq(File.join(disk_hash[0..1], disk_hash[2..3], disk_hash, creation_date, model.job_id.to_s, model.id.to_s, 'ci_build_artifacts.zip'))
+      end
+
+      it 'has exactly the same content' do
+        expect(::File.binread(model.file.path)).to eq(uploaded_content)
+      end
+    end
+
+    context 'when a job artifact is stored in legacy_path' do
+      let(:job_artifact) { create(:ci_job_artifact, :legacy_archive) }
+
+      it_behaves_like 'Read file from legacy path'
+    end
+
+    context 'when the artifact file is stored in hashed_path' do
+      let(:job_artifact) { create(:ci_job_artifact, :archive) }
+      let(:disk_hash) { Digest::SHA2.hexdigest(model.project_id.to_s) }
+      let(:creation_date) { model.created_at.utc.strftime('%Y_%m_%d') }
+
+      it_behaves_like 'Read file from hashed path'
+
+      context 'when file_location column is empty' do
+        before do
+          job_artifact.update_column(:file_location, nil)
+        end
+
+        it_behaves_like 'Read file from hashed path'
+      end
+    end
+  end
+
   describe "#migrate!" do
     before do
       uploader.store!(fixture_file_upload('spec/fixtures/trace/sample_trace'))