Revert Seed based parallelization implementation

Revert "Add Build seed specs"

This reverts commit 03bc722e.

Revert "Add build specs"

This reverts commit c2d49565.

Revert "Refactor parallelization implementation"

This reverts commit 72430483.

Revert "Implement POC for job parallelization"

This reverts commit 44b740f9.

app/models/ci/build.rb

@@ -801,16 +801,10 @@ module Ci
         variables.append(key: "CI_COMMIT_TAG", value: ref) if tag?
         variables.append(key: "CI_PIPELINE_TRIGGERED", value: 'true') if trigger_request
         variables.append(key: "CI_JOB_MANUAL", value: 'true') if action?
-        variables.append(key: "CI_NODE_INDEX", value: node_index.to_s) if self.options&.include?(:parallel)
-        variables.append(key: "CI_NODE_TOTAL", value: (self.options&.dig(:parallel) || 1).to_s)
         variables.concat(legacy_variables)
       end
     end
 
-    def node_index
-      name.match(%r{(\d+)/\d+$}).captures[0]
-    end
-
     def gitlab_version_info
       @gitlab_version_info ||= Gitlab::VersionInfo.parse(Gitlab::VERSION)
     end

lib/gitlab/ci/pipeline/seed/build.rb

@@ -24,16 +24,6 @@ module Gitlab
             end
           end
 
-          def parallel?
-            !!@attributes.dig(:options, :parallel)
-          end
-
-          def parallelize_build
-            total = @attributes[:options][:parallel]
-            Array.new(total) { ::Ci::Build.new(attributes) }
-              .each_with_index { |build, idx| build.name = "#{build.name} #{idx + 1}/#{total}" }
-          end
-
           def attributes
             @attributes.merge(
               pipeline: @pipeline,
@@ -48,7 +38,7 @@ module Gitlab
 
           def to_resource
             strong_memoize(:resource) do
-              parallel? ? parallelize_build : ::Ci::Build.new(attributes)
+              ::Ci::Build.new(attributes)
             end
           end
         end

lib/gitlab/ci/yaml_processor.rb

@@ -50,7 +50,6 @@ module Gitlab
             after_script: job[:after_script],
             environment: job[:environment],
             retry: job[:retry],
-            parallel: job[:parallel],
             start_in: job[:start_in]
           }.compact }
       end

spec/lib/gitlab/ci/pipeline/seed/build_spec.rb

@@ -13,46 +13,6 @@ describe Gitlab::Ci::Pipeline::Seed::Build do
     described_class.new(pipeline, attributes)
   end
 
-  describe '#parallel?' do
-    context 'when build is not parallelized' do
-      it 'should be false' do
-        expect(subject.parallel?).to eq(false)
-      end
-    end
-
-    context 'when build is parallelized' do
-      before do
-        attributes[:options] = { parallel: 5 }
-      end
-
-      it 'should be true' do
-        expect(subject.parallel?).to eq(true)
-      end
-    end
-  end
-
-  describe '#parallelize_build' do
-    let(:total) { 5 }
-
-    before do
-      attributes[:options] = { parallel: total }
-    end
-
-    it 'returns duplicated builds' do
-      builds = subject.parallelize_build
-
-      expect(builds.size).to eq(total)
-    end
-
-    it 'returns builds with indexed names' do
-      builds = subject.parallelize_build
-
-      base_name = builds.first.name.split(' ')[0]
-      names = builds.map(&:name)
-      expect(names).to all(match(%r{^#{base_name} \d+/\d+$}))
-    end
-  end
-
   describe '#attributes' do
     it 'returns hash attributes of a build' do
       expect(subject.attributes).to be_a Hash
@@ -62,23 +22,10 @@ describe Gitlab::Ci::Pipeline::Seed::Build do
   end
 
   describe '#to_resource' do
-    context 'when build is not parallelized' do
     it 'returns a valid build resource' do
       expect(subject.to_resource).to be_a(::Ci::Build)
       expect(subject.to_resource).to be_valid
     end
-    end
-
-    context 'when build is parallelized' do
-      before do
-        attributes[:options] = { parallel: 5 }
-      end
-
-      it 'returns a group of valid build resources' do
-        expect(subject.to_resource).to all(be_a(::Ci::Build))
-        expect(subject.to_resource).to all(be_valid)
-      end
-    end
 
     it 'memoizes a resource object' do
       build = subject.to_resource

spec/models/ci/build_spec.rb

@@ -1880,7 +1880,6 @@ describe Ci::Build do
         { key: 'CI_COMMIT_BEFORE_SHA', value: build.before_sha, public: true },
         { key: 'CI_COMMIT_REF_NAME', value: build.ref, public: true },
         { key: 'CI_COMMIT_REF_SLUG', value: build.ref_slug, public: true },
-        { key: 'CI_NODE_TOTAL', value: '1', public: true },
         { key: 'CI_BUILD_REF', value: build.sha, public: true },
         { key: 'CI_BUILD_BEFORE_SHA', value: build.before_sha, public: true },
         { key: 'CI_BUILD_REF_NAME', value: build.ref, public: true },
@@ -2342,28 +2341,6 @@ describe Ci::Build do
       end
     end
 
-    context 'when build is parallelized' do
-      let(:total) { 5 }
-      let(:index) { 3 }
-
-      before do
-        build.options[:parallel] = total
-        build.name = "#{build.name} #{index}/#{total}"
-      end
-
-      it 'includes CI_NODE_INDEX' do
-        is_expected.to include(
-          { key: 'CI_NODE_INDEX', value: index.to_s, public: true }
-        )
-      end
-
-      it 'includes correct CI_NODE_TOTAL' do
-        is_expected.to include(
-          { key: 'CI_NODE_TOTAL', value: total.to_s, public: true }
-        )
-      end
-    end
-
     describe 'variables ordering' do
       context 'when variables hierarchy is stubbed' do
         let(:build_pre_var) { { key: 'build', value: 'value', public: true } }
@@ -2470,31 +2447,6 @@ describe Ci::Build do
         end
       end
     end
-
-    describe '#node_index' do
-      subject { build.send(:node_index) }
-      let(:index) { 4 }
-
-      context 'when build has only one index' do
-        before do
-          build.name = "#{build.name} #{index}/5"
-        end
-
-        it 'returns the index' do
-          expect(subject).to eq(index.to_s)
-        end
-      end
-
-      context 'when build has more than one one index' do
-        before do
-          build.name = "test_build 1/3 #{index}/5"
-        end
-
-        it 'returns the last index' do
-          expect(subject).to eq(index.to_s)
-        end
-      end
-    end
   end
 
   describe '#scoped_variables' do