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Posted to github@beam.apache.org by GitBox <gi...@apache.org> on 2020/05/22 03:36:13 UTC
[GitHub] [beam] youngoli commented on a change in pull request #11763: [BEAM-9978] Adding functionality and tests to Go offset range tracker.
youngoli commented on a change in pull request #11763:
URL: https://github.com/apache/beam/pull/11763#discussion_r429025895
##########
File path: sdks/go/pkg/beam/io/rtrackers/offsetrange/offsetrange_test.go
##########
@@ -0,0 +1,212 @@
+// Licensed to the Apache Software Foundation (ASF) under one or more
+// contributor license agreements. See the NOTICE file distributed with
+// this work for additional information regarding copyright ownership.
+// The ASF licenses this file to You under the Apache License, Version 2.0
+// (the "License"); you may not use this file except in compliance with
+// the License. You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package offsetrange
+
+import (
+ "fmt"
+ "github.com/google/go-cmp/cmp"
+ "testing"
+)
+
+// TestRestriction_EvenSplits tests various splits and checks that they all
+// follow the contract for EvenSplits. This means that all restrictions are
+// evenly split, that each restriction has at least one element, and that each
+// element is present in the split restrictions.
+func TestRestriction_EvenSplits(t *testing.T) {
+ tests := []struct {
+ rest Restriction
+ num int64
+ }{
+ {rest: Restriction{Start: 0, End: 21}, num: 4},
+ {rest: Restriction{Start: 21, End: 42}, num: 4},
+ {rest: Restriction{Start: 0, End: 5}, num: 10},
+ {rest: Restriction{Start: 0, End: 21}, num: -1},
+ }
+ for _, test := range tests {
+ test := test
+ t.Run(fmt.Sprintf("(rest[%v, %v], splits = %v)",
+ test.rest.Start, test.rest.End, test.num), func(t *testing.T) {
+ r := test.rest
+
+ // Get the minimum size that a split restriction can be. Max size
+ // should be min + 1. This way we can check the size of each split.
+ num := test.num
+ if num <= 1 {
+ num = 1
+ }
+ min := (r.End - r.Start) / num
+
+ splits := r.EvenSplits(test.num)
+ prevEnd := r.Start
+ for _, split := range splits {
+ size := split.End - split.Start
+ // Check: Each restriction has at least 1 element.
+ if size == 0 {
+ t.Errorf("split restriction [%v, %v] is empty, size must be greater than 0.",
+ split.Start, split.End)
+ }
+ // Check: Restrictions are evenly split.
+ if size != min && size != min+1 {
+ t.Errorf("split restriction [%v, %v] has unexpected size. got: %v, want: %v or %v",
+ split.Start, split.End, size, min, min+1)
+ }
+ // Check: All elements are still in a split restrictions. This
+ // logic assumes that the splits are returned in order which
+ // isn't guaranteed by EvenSplits, but this check is way easier
+ // with the assumption.
+ if split.Start != prevEnd {
+ t.Errorf("restriction range [%v, %v] missing after splits.",
+ prevEnd, split.Start)
+ } else {
+ prevEnd = split.End
+ }
+ }
+ if prevEnd != r.End {
+ t.Errorf("restriction range [%v, %v] missing after splits.",
+ prevEnd, r.End)
+ }
+ })
+ }
+}
+
+// TestTracker_TryClaim validates both success and failure cases for TryClaim.
+func TestTracker_TryClaim(t *testing.T) {
+ // Test that TryClaim works as expected when called correctly.
+ t.Run("Correctness", func(t *testing.T) {
+ tests := []struct {
+ rest Restriction
+ claims []int64
+ }{
+ {rest: Restriction{Start: 0, End: 3}, claims: []int64{0, 1, 2, 3}},
+ {rest: Restriction{Start: 10, End: 40}, claims: []int64{15, 20, 50}},
+ {rest: Restriction{Start: 0, End: 3}, claims: []int64{4}},
+ }
+ for _, test := range tests {
+ test := test
+ t.Run(fmt.Sprintf("(rest[%v, %v], claims = %v)",
+ test.rest.Start, test.rest.End, test.claims), func(t *testing.T) {
+ rt := NewTracker(test.rest)
+ for _, pos := range test.claims {
+ ok := rt.TryClaim(pos)
Review comment:
Done.
##########
File path: sdks/go/pkg/beam/io/rtrackers/offsetrange/offsetrange_test.go
##########
@@ -0,0 +1,212 @@
+// Licensed to the Apache Software Foundation (ASF) under one or more
+// contributor license agreements. See the NOTICE file distributed with
+// this work for additional information regarding copyright ownership.
+// The ASF licenses this file to You under the Apache License, Version 2.0
+// (the "License"); you may not use this file except in compliance with
+// the License. You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package offsetrange
+
+import (
+ "fmt"
+ "github.com/google/go-cmp/cmp"
+ "testing"
+)
+
+// TestRestriction_EvenSplits tests various splits and checks that they all
+// follow the contract for EvenSplits. This means that all restrictions are
+// evenly split, that each restriction has at least one element, and that each
+// element is present in the split restrictions.
+func TestRestriction_EvenSplits(t *testing.T) {
+ tests := []struct {
+ rest Restriction
+ num int64
+ }{
+ {rest: Restriction{Start: 0, End: 21}, num: 4},
+ {rest: Restriction{Start: 21, End: 42}, num: 4},
+ {rest: Restriction{Start: 0, End: 5}, num: 10},
+ {rest: Restriction{Start: 0, End: 21}, num: -1},
+ }
+ for _, test := range tests {
+ test := test
+ t.Run(fmt.Sprintf("(rest[%v, %v], splits = %v)",
+ test.rest.Start, test.rest.End, test.num), func(t *testing.T) {
+ r := test.rest
+
+ // Get the minimum size that a split restriction can be. Max size
+ // should be min + 1. This way we can check the size of each split.
+ num := test.num
+ if num <= 1 {
+ num = 1
+ }
+ min := (r.End - r.Start) / num
+
+ splits := r.EvenSplits(test.num)
+ prevEnd := r.Start
+ for _, split := range splits {
+ size := split.End - split.Start
+ // Check: Each restriction has at least 1 element.
+ if size == 0 {
+ t.Errorf("split restriction [%v, %v] is empty, size must be greater than 0.",
+ split.Start, split.End)
+ }
+ // Check: Restrictions are evenly split.
+ if size != min && size != min+1 {
+ t.Errorf("split restriction [%v, %v] has unexpected size. got: %v, want: %v or %v",
+ split.Start, split.End, size, min, min+1)
+ }
+ // Check: All elements are still in a split restrictions. This
+ // logic assumes that the splits are returned in order which
+ // isn't guaranteed by EvenSplits, but this check is way easier
+ // with the assumption.
+ if split.Start != prevEnd {
+ t.Errorf("restriction range [%v, %v] missing after splits.",
+ prevEnd, split.Start)
+ } else {
+ prevEnd = split.End
+ }
+ }
+ if prevEnd != r.End {
+ t.Errorf("restriction range [%v, %v] missing after splits.",
+ prevEnd, r.End)
+ }
+ })
+ }
+}
+
+// TestTracker_TryClaim validates both success and failure cases for TryClaim.
+func TestTracker_TryClaim(t *testing.T) {
+ // Test that TryClaim works as expected when called correctly.
+ t.Run("Correctness", func(t *testing.T) {
+ tests := []struct {
+ rest Restriction
+ claims []int64
+ }{
+ {rest: Restriction{Start: 0, End: 3}, claims: []int64{0, 1, 2, 3}},
+ {rest: Restriction{Start: 10, End: 40}, claims: []int64{15, 20, 50}},
+ {rest: Restriction{Start: 0, End: 3}, claims: []int64{4}},
+ }
+ for _, test := range tests {
+ test := test
+ t.Run(fmt.Sprintf("(rest[%v, %v], claims = %v)",
+ test.rest.Start, test.rest.End, test.claims), func(t *testing.T) {
+ rt := NewTracker(test.rest)
+ for _, pos := range test.claims {
+ ok := rt.TryClaim(pos)
+ // If TryClaim returns false, check if there was an error.
+ if !ok && !rt.IsDone() {
+ t.Fatalf("tracker claiming %v failed, error: %v", pos, rt.GetError())
+ }
+ }
+ })
+ }
+ })
+
+ // Test that each invalid error case actually results in an error.
+ t.Run("Errors", func(t *testing.T) {
+ tests := []struct {
+ rest Restriction
+ claims []int64
+ }{
+ // Claiming backwards.
+ {rest: Restriction{Start: 0, End: 3}, claims: []int64{0, 2, 1}},
+ // Claiming before start of restriction.
+ {rest: Restriction{Start: 10, End: 40}, claims: []int64{8}},
+ // Claiming after tracker signalled to stop.
+ {rest: Restriction{Start: 0, End: 3}, claims: []int64{4, 5}},
+ }
+ for _, test := range tests {
+ test := test
+ t.Run(fmt.Sprintf("(rest[%v, %v], claims = %v)",
+ test.rest.Start, test.rest.End, test.claims), func(t *testing.T) {
+ rt := NewTracker(test.rest)
+ for _, pos := range test.claims {
+ ok := rt.TryClaim(pos)
+ // Finish successfully if we got an error.
+ if !ok && !rt.IsDone() && rt.GetError() != nil {
+ return
+ }
+ }
+ t.Fatal("tracker did not fail on invalid claim")
+ })
+ }
+ })
+}
+
+// TestTracker_TrySplit tests that TrySplit follows its contract, meaning that
+// splits don't lose any elements, split fractions are clamped to 0 or 1, and
+// that TrySplit always splits at the nearest integer greater than the given
+// fraction.
+func TestTracker_TrySplit(t *testing.T) {
+ tests := []struct {
+ rest Restriction
+ claimed int64
+ fraction float64
+ splitPt int64 // Index where we want the split to happen.
+ }{
+ {
+ rest: Restriction{Start: 0, End: 1},
+ claimed: 0,
+ fraction: 0.5,
+ splitPt: 1,
+ },
+ {
+ rest: Restriction{Start: 0, End: 5},
+ claimed: 0,
+ fraction: 0.5,
+ splitPt: 3,
+ },
+ {
+ rest: Restriction{Start: 0, End: 10},
+ claimed: 5,
+ fraction: 0.5,
+ splitPt: 8,
+ },
+ {
+ rest: Restriction{Start: 0, End: 10},
+ claimed: 5,
+ fraction: -0.5,
+ splitPt: 5,
+ },
+ {
+ rest: Restriction{Start: 0, End: 10},
+ claimed: 5,
+ fraction: 1.5,
+ splitPt: 10,
+ },
+ }
+ for _, test := range tests {
+ test := test
+ t.Run(fmt.Sprintf("(split at %v of [%v, %v])",
+ test.fraction, test.claimed, test.rest.End), func(t *testing.T) {
+ rt := NewTracker(test.rest)
+ ok := rt.TryClaim(test.claimed)
+ if !ok {
Review comment:
Done.
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