Hashed Storage is enabled by default on new installations

updated documentation for Geo

changelogs/unreleased/hashed-storage-enabled-default.yml

+---
+title: Hashed Storage is enabled by default on new installations
+merge_request: 29586
+author:
+type: changed

db/migrate/20190613030606_enable_hashed_storage_by_default.rb

+# frozen_string_literal: true
+
+class EnableHashedStorageByDefault < ActiveRecord::Migration[5.1]
+  include Gitlab::Database::MigrationHelpers
+
+  DOWNTIME = false
+
+  def up
+    change_column_default :application_settings, :hashed_storage_enabled, true
+  end
+
+  def down
+    change_column_default :application_settings, :hashed_storage_enabled, false
+  end
+end

db/schema.rb

@@ -10,7 +10,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 20190611161641) do
+ActiveRecord::Schema.define(version: 20190613030606) do
 
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
@@ -141,7 +141,7 @@ ActiveRecord::Schema.define(version: 20190611161641) do
     t.boolean "help_page_hide_commercial_content", default: false
     t.string "help_page_support_url"
     t.integer "performance_bar_allowed_group_id"
-    t.boolean "hashed_storage_enabled", default: false, null: false
+    t.boolean "hashed_storage_enabled", default: true, null: false
     t.boolean "project_export_enabled", default: true, null: false
     t.boolean "auto_devops_enabled", default: true, null: false
     t.boolean "throttle_unauthenticated_enabled", default: false, null: false

doc/administration/repository_storage_types.md

@@ -47,18 +47,12 @@ Any change in the URL will need to be reflected on disk (when groups / users or
 projects are renamed). This can add a lot of load in big installations,
 especially if using any type of network based filesystem.
 
-CAUTION: **Caution:**
-For Geo in particular: Geo does work with legacy storage, but in some
-edge cases due to race conditions it can lead to errors when a project is
-renamed multiple times in short succession, or a project is deleted and
-recreated under the same name very quickly. We expect these race events to be
-rare, and we have not observed a race condition side-effect happening yet.
-This pattern also exists in other objects stored in GitLab, like issue
-Attachments, GitLab Pages artifacts, Docker Containers for the integrated
-Registry, etc. Hashed storage is a requirement for Geo. 
-
 ## Hashed Storage
 
+CAUTION: **Important:**
+Geo requires Hashed Storage since 12.0. If you haven't migrated yet,
+check the [migration instructions](#how-to-migrate-to-hashed-storage) ASAP.
+
 Hashed Storage is the new storage behavior we rolled out with 10.0. Instead
 of coupling project URL and the folder structure where the repository will be
 stored on disk, we are coupling a hash, based on the project's ID. This makes

spec/finders/fork_projects_finder_spec.rb

@@ -12,6 +12,8 @@ describe ForkProjectsFinder do
   let(:private_fork_member) { create(:user) }
 
   before do
+    stub_feature_flags(object_pools: { enabled: false, thing: source_project })
+
     private_fork.update!(visibility_level: Gitlab::VisibilityLevel::PRIVATE)
     private_fork.add_developer(private_fork_member)
 

spec/models/project_spec.rb

@@ -3478,6 +3478,7 @@ describe Project do
 
     before do
       allow(project).to receive(:gitlab_shell).and_return(gitlab_shell)
+      stub_application_setting(hashed_storage_enabled: false)
     end
 
     describe '#base_dir' do
@@ -3584,10 +3585,6 @@ describe Project do
     let(:hashed_prefix) { File.join('@hashed', hash[0..1], hash[2..3]) }
     let(:hashed_path) { File.join(hashed_prefix, hash) }
 
-    before do
-      stub_application_setting(hashed_storage_enabled: true)
-    end
-
     describe '#legacy_storage?' do
       it 'returns false' do
         expect(project.legacy_storage?).to be_falsey
@@ -4729,10 +4726,6 @@ describe Project do
 
     subject { project.object_pool_params }
 
-    before do
-      stub_application_setting(hashed_storage_enabled: true)
-    end
-
     context 'when the objects cannot be pooled' do
       let(:project) { create(:project, :repository, :private) }
 
@@ -4778,10 +4771,6 @@ describe Project do
       context 'when objects are poolable' do
         let(:project) { create(:project, :repository, :public) }
 
-        before do
-          stub_application_setting(hashed_storage_enabled: true)
-        end
-
         it { is_expected.to be_git_objects_poolable }
       end
     end

spec/services/projects/after_rename_service_spec.rb

@@ -23,6 +23,7 @@ describe Projects::AfterRenameService do
         allow(project).to receive(:gitlab_shell).and_return(gitlab_shell)
 
         stub_feature_flags(skip_hashed_storage_upgrade: false)
+        stub_application_setting(hashed_storage_enabled: false)
       end
 
       it 'renames a repository' do

spec/services/projects/create_service_spec.rb

@@ -228,6 +228,7 @@ describe Projects::CreateService, '#execute' do
 
       context 'with legacy storage' do
         before do
+          stub_application_setting(hashed_storage_enabled: false)
           gitlab_shell.create_repository(repository_storage, "#{user.namespace.full_path}/existing", 'group/project')
         end
 
@@ -259,7 +260,6 @@ describe Projects::CreateService, '#execute' do
         let(:hashed_path) { '@hashed/6b/86/6b86b273ff34fce19d6b804eff5a3f5747ada4eaa22f1d49c01e52ddb7875b4b' }
 
         before do
-          stub_application_setting(hashed_storage_enabled: true)
           allow(Digest::SHA2).to receive(:hexdigest) { hash }
         end
 

spec/services/projects/fork_service_spec.rb

@@ -116,11 +116,12 @@ describe Projects::ForkService do
         end
       end
 
-      context 'repository already exists' do
+      context 'repository in legacy storage already exists' do
         let(:repository_storage) { 'default' }
         let(:repository_storage_path) { Gitlab.config.repositories.storages[repository_storage].legacy_disk_path }
 
         before do
+          stub_application_setting(hashed_storage_enabled: false)
           gitlab_shell.create_repository(repository_storage, "#{@to_user.namespace.full_path}/#{@from_project.path}", "#{@to_user.namespace.full_path}/#{@from_project.path}")
         end