/usr/share/gocode/src/github.com/couchbase/moss/segment_index_test.go is in golang-github-couchbase-moss-dev 0.0~git20170914.0.07c86e8-4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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//
// Licensed 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 moss
import (
"bytes"
"fmt"
"io/ioutil"
"os"
"sort"
"testing"
"time"
)
func TestSegmentKeysIndex(t *testing.T) {
// Consider a moss segment with this data:
// Buf: |key1|val1|key10|val10|key100|val100|key1000|val1000
// |key250|val250|key4000|val4000|key500|val500
// Kvs: |4|4|0 |5|5|8 |6|6|18 |7|7|30
// |7|7|44 |7|7|56 |6|6|70
keys := []string{
"key1",
"key10",
"key100",
"key1000",
"key250",
"key4000",
"key500",
}
s := newSegmentKeysIndex(
30, // quota
7, // number of keys
6, // average key size
)
for i, k := range keys {
ret := s.add(i, []byte(k))
if !ret {
t.Errorf("Unexpected Add failure!")
}
}
ret := s.add(0, []byte("key"))
if ret {
t.Errorf("Space shouldn't have been available!")
}
if s.numIndexableKeys != 3 {
t.Errorf("Unexpected number of keys (%v) indexed!", s.numIndexableKeys)
}
data := []byte("key1key1000key500")
if !bytes.Contains(s.data, data) {
t.Errorf("Unexpected data in index array: %v", string(s.data))
}
if s.numKeys != 3 ||
s.offsets[0] != 0 || s.offsets[1] != 4 || s.offsets[2] != 11 {
t.Errorf("Unexpected content in offsets array!")
}
if s.hop != 3 {
t.Errorf("Unexpected hop: %v!", s.hop)
}
var left, right int
left, right = s.lookup([]byte("key1000"))
if left != 3 || right != 4 {
t.Errorf("Unexpected results for key1000")
}
left, right = s.lookup([]byte("key1"))
if left != 0 || right != 1 {
t.Errorf("Unexpected results for key1")
}
left, right = s.lookup([]byte("key500"))
if left != 6 || right != 7 {
t.Errorf("Unexpected results for key500")
}
left, right = s.lookup([]byte("key400"))
if left != 3 || right != 6 {
t.Errorf("Unexpected results for key4000")
}
left, right = s.lookup([]byte("key100"))
if left != 0 || right != 3 {
t.Errorf("Unexpected results for key100")
}
left, right = s.lookup([]byte("key0"))
if left != 0 || right != 0 {
t.Errorf("Unexpected results for key0")
}
left, right = s.lookup([]byte("key6"))
if left != 6 || right != 7 {
t.Errorf("Unexpected results for key6")
}
}
type byNS []time.Duration
func (x byNS) Len() int { return len(x) }
func (x byNS) Swap(i, j int) { x[i], x[j] = x[j], x[i] }
func (x byNS) Less(i, j int) bool { return x[i].Nanoseconds() < x[j].Nanoseconds() }
type testResults struct {
name string
batchsize int
writetime time.Duration
readtime time.Duration
fetchtimes []time.Duration
mean time.Duration
}
func TestSegmentKindBasicWithAndWithoutIndex(t *testing.T) {
numItems := 1000000
ch := make(chan *testResults)
runTest := func(name string, batchSize, quota, minSize int) {
tmpDir, _ := ioutil.TempDir("", "mossStore")
defer os.RemoveAll(tmpDir)
start := time.Now()
so := DefaultStoreOptions
so.CompactionSync = true
so.SegmentKeysIndexMaxBytes = quota
so.SegmentKeysIndexMinKeyBytes = minSize
spo := StorePersistOptions{CompactionConcern: CompactionAllow}
store, coll, er := OpenStoreCollection(tmpDir, so, spo)
if er != nil || store == nil || coll == nil {
t.Fatalf("error opening store collection: %v", tmpDir)
}
x := 0
for i := 0; i < numItems; i = i + batchSize {
ba, err := coll.NewBatch(batchSize, batchSize*512)
if err != nil {
t.Fatalf("error creating new batch: %v", err)
}
for j := i + batchSize - 1; j >= i; j-- {
k := fmt.Sprintf("%08d", x)
v := fmt.Sprintf("%128d", x)
ba.Set([]byte(k), []byte(v))
x++
}
err = coll.ExecuteBatch(ba, WriteOptions{})
if err != nil {
t.Fatalf("error executing batch: %v", err)
}
err = ba.Close()
if err != nil {
t.Fatalf("error closing batch: %v", err)
}
}
writetime := time.Since(start)
fetchtimes := make([]time.Duration, numItems/10)
var aggregate int64
start = time.Now()
for i := 0; i < numItems/10; i++ {
gstart := time.Now()
val, err := coll.Get([]byte(fmt.Sprintf("%08d", i*10)), ReadOptions{})
fetchtimes[i] = time.Since(gstart)
expect := fmt.Sprintf("%128d", i*10)
if err != nil || string(val) != expect {
t.Fatalf("Unexpected error: %v / Vals mismatch: '%v' != '%v'",
err, string(val), expect)
}
aggregate += fetchtimes[i].Nanoseconds()
}
readtime := time.Since(start)
sort.Sort(byNS(fetchtimes))
mean := time.Duration(aggregate/int64(len(fetchtimes))) * time.Nanosecond
ch <- &testResults{
name: name,
batchsize: batchSize,
writetime: writetime,
readtime: readtime,
fetchtimes: fetchtimes,
mean: mean,
}
}
go runTest("WITHOUT SEG INDEX", 100, 0, 0)
go runTest("WITH SEG INDEX", 100, 100000, 1000000)
go runTest("WITHOUT SEG INDEX", 10000, 0, 0)
go runTest("WITH SEG INDEX", 10000, 100000, 1000000)
var results []*testResults
for i := 0; i < 4; i++ {
results = append(results, <-ch)
}
fmt.Printf("%17v (numItems: %10v) %24v %v\n",
" ", numItems,
" ", "<-------------------- Fetch times -------------------->")
fmt.Printf("%17v %9v %15v %14v %10v %10v %10v %10v %10v\n",
" ", "BatchSize", "Writetime(s)", "Readtime(s)",
"Mean", "Median", "90th", "95th", "99th")
for _, result := range results {
fmt.Printf("%17v %9v %15.3v %14.3v %10v %10v %10v %10v %10v\n",
result.name,
result.batchsize,
result.writetime.Seconds(),
result.readtime.Seconds(),
result.mean,
result.fetchtimes[len(result.fetchtimes)/2],
result.fetchtimes[90*len(result.fetchtimes)/100],
result.fetchtimes[95*len(result.fetchtimes)/100],
result.fetchtimes[99*len(result.fetchtimes)/100])
}
}
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