553 lines
12 KiB
Go
553 lines
12 KiB
Go
// Copyright (c) 2017 Couchbase, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package mergeplan
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import (
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"encoding/json"
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"fmt"
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"math/rand"
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"os"
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"reflect"
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"sort"
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"testing"
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"time"
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)
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// Implements the Segment interface for testing,
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type segment struct {
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MyId uint64
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MyFullSize int64
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MyLiveSize int64
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}
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func (s *segment) Id() uint64 { return s.MyId }
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func (s *segment) FullSize() int64 { return s.MyFullSize }
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func (s *segment) LiveSize() int64 { return s.MyLiveSize }
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func makeLinearSegments(n int) (rv []Segment) {
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for i := 0; i < n; i++ {
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rv = append(rv, &segment{
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MyId: uint64(i),
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MyFullSize: int64(i),
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MyLiveSize: int64(i),
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})
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}
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return rv
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}
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// ----------------------------------------
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func TestSimplePlan(t *testing.T) {
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segs := makeLinearSegments(10)
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tests := []struct {
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Desc string
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Segments []Segment
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Options *MergePlanOptions
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ExpectPlan *MergePlan
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ExpectErr error
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}{
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{"nil segments",
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nil, nil, nil, nil},
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{"empty segments",
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[]Segment{}, nil, nil, nil},
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{"1 segment",
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[]Segment{segs[1]},
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nil,
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nil,
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nil,
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},
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{"2 segments",
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[]Segment{
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segs[1],
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segs[2],
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},
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nil,
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&MergePlan{
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Tasks: []*MergeTask{
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&MergeTask{
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Segments: []Segment{
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segs[2],
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segs[1],
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},
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},
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},
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},
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nil,
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},
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{"3 segments",
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[]Segment{
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segs[1],
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segs[2],
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segs[9],
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},
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nil,
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&MergePlan{
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Tasks: []*MergeTask{
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&MergeTask{
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Segments: []Segment{
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segs[9],
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segs[2],
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segs[1],
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},
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},
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},
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},
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nil,
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},
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{"many segments",
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[]Segment{
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segs[1],
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segs[2],
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segs[3],
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segs[4],
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segs[5],
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segs[6],
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},
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&MergePlanOptions{
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MaxSegmentsPerTier: 1,
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MaxSegmentSize: 1000,
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TierGrowth: 2.0,
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SegmentsPerMergeTask: 2,
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FloorSegmentSize: 1,
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},
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&MergePlan{
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Tasks: []*MergeTask{
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&MergeTask{
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Segments: []Segment{
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segs[6],
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segs[5],
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},
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},
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},
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},
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nil,
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},
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}
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for testi, test := range tests {
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plan, err := Plan(test.Segments, test.Options)
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if err != test.ExpectErr {
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testj, _ := json.Marshal(&test)
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t.Errorf("testi: %d, test: %s, got err: %v",
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testi, testj, err)
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}
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if !reflect.DeepEqual(plan, test.ExpectPlan) {
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testj, _ := json.Marshal(&test)
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planj, _ := json.Marshal(&plan)
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t.Errorf("testi: %d, test: %s, got plan: %s",
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testi, testj, planj)
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}
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}
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}
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// ----------------------------------------
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func TestSort(t *testing.T) {
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segs := makeLinearSegments(10)
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sort.Sort(byLiveSizeDescending(segs))
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for i := 1; i < len(segs); i++ {
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if segs[i].LiveSize() >= segs[i-1].LiveSize() {
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t.Errorf("not descending")
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}
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}
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}
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// ----------------------------------------
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func TestCalcBudget(t *testing.T) {
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tests := []struct {
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totalSize int64
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firstTierSize int64
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o MergePlanOptions
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expect int
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}{
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{0, 0, MergePlanOptions{}, 0},
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{1, 0, MergePlanOptions{}, 1},
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{9, 0, MergePlanOptions{}, 9},
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{1, 1,
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MergePlanOptions{
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MaxSegmentsPerTier: 1,
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MaxSegmentSize: 1000,
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TierGrowth: 2.0,
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SegmentsPerMergeTask: 2,
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FloorSegmentSize: 1,
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},
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1,
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},
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{21, 1,
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MergePlanOptions{
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MaxSegmentsPerTier: 1,
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MaxSegmentSize: 1000,
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TierGrowth: 2.0,
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SegmentsPerMergeTask: 2,
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FloorSegmentSize: 1,
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},
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5,
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},
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{21, 1,
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MergePlanOptions{
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MaxSegmentsPerTier: 2,
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MaxSegmentSize: 1000,
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TierGrowth: 2.0,
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SegmentsPerMergeTask: 2,
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FloorSegmentSize: 1,
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},
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7,
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},
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{1000, 2000, DefaultMergePlanOptions,
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1},
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{5000, 2000, DefaultMergePlanOptions,
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3},
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{10000, 2000, DefaultMergePlanOptions,
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5},
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{30000, 2000, DefaultMergePlanOptions,
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11},
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{1000000, 2000, DefaultMergePlanOptions,
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24},
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{1000000000, 2000, DefaultMergePlanOptions,
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54},
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}
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for testi, test := range tests {
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res := CalcBudget(test.totalSize, test.firstTierSize, &test.o)
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if res != test.expect {
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t.Errorf("testi: %d, test: %#v, res: %v",
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testi, test, res)
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}
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}
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}
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// ----------------------------------------
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func TestInsert1SameSizedSegmentBetweenMerges(t *testing.T) {
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o := &MergePlanOptions{
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MaxSegmentSize: 1000,
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MaxSegmentsPerTier: 3,
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TierGrowth: 3.0,
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SegmentsPerMergeTask: 3,
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}
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spec := testCyclesSpec{
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descrip: "i1sssbm",
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verbose: os.Getenv("VERBOSE") == "i1sssbm" || os.Getenv("VERBOSE") == "y",
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n: 200,
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o: o,
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beforePlan: func(spec *testCyclesSpec) {
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spec.segments = append(spec.segments, &segment{
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MyId: spec.nextSegmentId,
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MyFullSize: 1,
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MyLiveSize: 1,
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})
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spec.nextSegmentId++
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},
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}
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spec.runCycles(t)
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}
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func TestInsertManySameSizedSegmentsBetweenMerges(t *testing.T) {
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o := &MergePlanOptions{
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MaxSegmentSize: 1000,
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MaxSegmentsPerTier: 3,
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TierGrowth: 3.0,
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SegmentsPerMergeTask: 3,
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}
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spec := testCyclesSpec{
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descrip: "imsssbm",
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verbose: os.Getenv("VERBOSE") == "imsssbm" || os.Getenv("VERBOSE") == "y",
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n: 20,
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o: o,
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beforePlan: func(spec *testCyclesSpec) {
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for i := 0; i < 10; i++ {
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spec.segments = append(spec.segments, &segment{
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MyId: spec.nextSegmentId,
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MyFullSize: 1,
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MyLiveSize: 1,
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})
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spec.nextSegmentId++
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}
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},
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}
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spec.runCycles(t)
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}
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func TestInsertManySameSizedSegmentsWithDeletionsBetweenMerges(t *testing.T) {
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o := &MergePlanOptions{
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MaxSegmentSize: 1000,
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MaxSegmentsPerTier: 3,
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TierGrowth: 3.0,
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SegmentsPerMergeTask: 3,
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}
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spec := testCyclesSpec{
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descrip: "imssswdbm",
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verbose: os.Getenv("VERBOSE") == "imssswdbm" || os.Getenv("VERBOSE") == "y",
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n: 20,
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o: o,
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beforePlan: func(spec *testCyclesSpec) {
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for i := 0; i < 10; i++ {
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// Deletions are a shrinking of the live size.
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for i, seg := range spec.segments {
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if (spec.cycle+i)%5 == 0 {
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s := seg.(*segment)
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if s.MyLiveSize > 0 {
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s.MyLiveSize -= 1
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}
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}
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}
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spec.segments = append(spec.segments, &segment{
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MyId: spec.nextSegmentId,
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MyFullSize: 1,
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MyLiveSize: 1,
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})
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spec.nextSegmentId++
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}
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},
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}
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spec.runCycles(t)
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}
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func TestInsertManyDifferentSizedSegmentsBetweenMerges(t *testing.T) {
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o := &MergePlanOptions{
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MaxSegmentSize: 1000,
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MaxSegmentsPerTier: 3,
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TierGrowth: 3.0,
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SegmentsPerMergeTask: 3,
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}
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spec := testCyclesSpec{
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descrip: "imdssbm",
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verbose: os.Getenv("VERBOSE") == "imdssbm" || os.Getenv("VERBOSE") == "y",
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n: 20,
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o: o,
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beforePlan: func(spec *testCyclesSpec) {
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for i := 0; i < 10; i++ {
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spec.segments = append(spec.segments, &segment{
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MyId: spec.nextSegmentId,
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MyFullSize: int64(1 + (i % 5)),
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MyLiveSize: int64(1 + (i % 5)),
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})
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spec.nextSegmentId++
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}
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},
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}
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spec.runCycles(t)
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}
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func TestManySameSizedSegmentsWithDeletesBetweenMerges(t *testing.T) {
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o := &MergePlanOptions{
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MaxSegmentSize: 1000,
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MaxSegmentsPerTier: 3,
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TierGrowth: 3.0,
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SegmentsPerMergeTask: 3,
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}
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var numPlansWithTasks int
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spec := testCyclesSpec{
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descrip: "mssswdbm",
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verbose: os.Getenv("VERBOSE") == "mssswdbm" || os.Getenv("VERBOSE") == "y",
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n: 20,
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o: o,
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beforePlan: func(spec *testCyclesSpec) {
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// Deletions are a shrinking of the live size.
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for i, seg := range spec.segments {
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if (spec.cycle+i)%5 == 0 {
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s := seg.(*segment)
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if s.MyLiveSize > 0 {
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s.MyLiveSize -= 1
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}
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}
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}
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for i := 0; i < 10; i++ {
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spec.segments = append(spec.segments, &segment{
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MyId: spec.nextSegmentId,
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MyFullSize: 1,
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MyLiveSize: 1,
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})
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spec.nextSegmentId++
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}
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},
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afterPlan: func(spec *testCyclesSpec, plan *MergePlan) {
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if plan != nil && len(plan.Tasks) > 0 {
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numPlansWithTasks++
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}
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},
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}
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spec.runCycles(t)
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if numPlansWithTasks <= 0 {
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t.Errorf("expected some plans with tasks")
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}
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}
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func TestValidateMergePlannerOptions(t *testing.T) {
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o := &MergePlanOptions{
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MaxSegmentSize: 1 << 32,
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MaxSegmentsPerTier: 3,
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TierGrowth: 3.0,
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SegmentsPerMergeTask: 3,
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}
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err := ValidateMergePlannerOptions(o)
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if err != ErrMaxSegmentSizeTooLarge {
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t.Error("Validation expected to fail as the MaxSegmentSize exceeds limit")
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}
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}
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func TestPlanMaxSegmentSizeLimit(t *testing.T) {
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o := &MergePlanOptions{
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MaxSegmentSize: 20,
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MaxSegmentsPerTier: 5,
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TierGrowth: 3.0,
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SegmentsPerMergeTask: 5,
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FloorSegmentSize: 5,
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}
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segments := makeLinearSegments(20)
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s := rand.NewSource(time.Now().UnixNano())
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r := rand.New(s)
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max := 20
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min := 5
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randomInRange := func() int64 {
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return int64(r.Intn(max-min) + min)
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}
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for i := 1; i < 20; i++ {
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o.MaxSegmentSize = randomInRange()
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plans, err := Plan(segments, o)
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if err != nil {
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t.Errorf("Plan failed, err: %v", err)
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}
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if len(plans.Tasks) == 0 {
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t.Errorf("expected some plans with tasks")
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}
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for _, task := range plans.Tasks {
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var totalLiveSize int64
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for _, segs := range task.Segments {
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totalLiveSize += segs.LiveSize()
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}
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if totalLiveSize >= o.MaxSegmentSize {
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t.Errorf("merged segments size: %d exceeding the MaxSegmentSize"+
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"limit: %d", totalLiveSize, o.MaxSegmentSize)
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}
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}
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}
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}
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// ----------------------------------------
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type testCyclesSpec struct {
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descrip string
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verbose bool
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n int // Number of cycles to run.
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o *MergePlanOptions
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beforePlan func(*testCyclesSpec)
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afterPlan func(*testCyclesSpec, *MergePlan)
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cycle int
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segments []Segment
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nextSegmentId uint64
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}
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func (spec *testCyclesSpec) runCycles(t *testing.T) {
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numPlansWithTasks := 0
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for spec.cycle < spec.n {
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if spec.verbose {
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emit(spec.descrip, spec.cycle, 0, spec.segments, nil)
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}
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if spec.beforePlan != nil {
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spec.beforePlan(spec)
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}
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if spec.verbose {
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emit(spec.descrip, spec.cycle, 1, spec.segments, nil)
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}
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plan, err := Plan(spec.segments, spec.o)
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if err != nil {
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t.Fatalf("expected no err, got: %v", err)
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}
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if spec.afterPlan != nil {
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spec.afterPlan(spec, plan)
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}
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if spec.verbose {
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emit(spec.descrip, spec.cycle, 2, spec.segments, plan)
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}
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if plan != nil {
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if len(plan.Tasks) > 0 {
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numPlansWithTasks++
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}
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for _, task := range plan.Tasks {
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spec.segments = removeSegments(spec.segments, task.Segments)
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var totLiveSize int64
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for _, segment := range task.Segments {
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totLiveSize += segment.LiveSize()
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}
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if totLiveSize > 0 {
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spec.segments = append(spec.segments, &segment{
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MyId: spec.nextSegmentId,
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MyFullSize: totLiveSize,
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MyLiveSize: totLiveSize,
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})
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spec.nextSegmentId++
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}
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}
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}
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spec.cycle++
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}
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if numPlansWithTasks <= 0 {
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t.Errorf("expected some plans with tasks")
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}
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}
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func emit(descrip string, cycle int, step int, segments []Segment, plan *MergePlan) {
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if os.Getenv("VERBOSE") == "" {
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return
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}
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suffix := ""
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if plan != nil && len(plan.Tasks) > 0 {
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suffix = "hasPlan"
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}
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fmt.Printf("%s %d.%d ---------- %s\n", descrip, cycle, step, suffix)
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fmt.Printf("%s\n", ToBarChart(descrip, 100, segments, plan))
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}
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