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/*
* Copyright 2019 Dgraph Labs, Inc. and Contributors
*
* 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 table
import (
"fmt"
"math/rand"
"os"
"testing"
"time"
"github.com/stretchr/testify/require"
"github.com/dgraph-io/badger/v2/options"
"github.com/dgraph-io/badger/v2/pb"
"github.com/dgraph-io/badger/v2/y"
)
func TestTableIndex(t *testing.T) {
rand.Seed(time.Now().Unix())
keyPrefix := "key"
t.Run("single key", func(t *testing.T) {
opts := Options{Compression: options.ZSTD}
f := buildTestTable(t, keyPrefix, 1, opts)
tbl, err := OpenTable(f, opts)
require.NoError(t, err)
require.Len(t, tbl.blockOffset, 1)
})
t.Run("multiple keys", func(t *testing.T) {
opts := []Options{}
// Normal mode.
opts = append(opts, Options{BlockSize: 4 * 1024, BloomFalsePositive: 0.01})
// Encryption mode.
key := make([]byte, 32)
_, err := rand.Read(key)
require.NoError(t, err)
opts = append(opts, Options{BlockSize: 4 * 1024, BloomFalsePositive: 0.01,
DataKey: &pb.DataKey{Data: key}})
// Compression mode.
opts = append(opts, Options{BlockSize: 4 * 1024, BloomFalsePositive: 0.01,
Compression: options.ZSTD})
keysCount := 10000
for _, opt := range opts {
builder := NewTableBuilder(opt)
filename := fmt.Sprintf("%s%c%d.sst", os.TempDir(), os.PathSeparator, rand.Uint32())
f, err := y.OpenSyncedFile(filename, true)
require.NoError(t, err)
blockFirstKeys := make([][]byte, 0)
blockCount := 0
for i := 0; i < keysCount; i++ {
k := []byte(fmt.Sprintf("%016x", i))
v := fmt.Sprintf("%d", i)
vs := y.ValueStruct{Value: []byte(v)}
if i == 0 { // This is first key for first block.
blockFirstKeys = append(blockFirstKeys, k)
blockCount = 1
} else if builder.shouldFinishBlock(k, vs) {
blockCount++
blockFirstKeys = append(blockFirstKeys, k)
}
builder.Add(k, vs, 0)
}
_, err = f.Write(builder.Finish())
require.NoError(t, err, "unable to write to file")
tbl, err := OpenTable(f, opt)
require.NoError(t, err, "unable to open table")
if opt.DataKey == nil {
// key id is zero if thre is no datakey.
require.Equal(t, tbl.KeyID(), uint64(0))
}
// Ensure index is built correctly
require.Equal(t, blockCount, tbl.noOfBlocks)
idx, err := tbl.readTableIndex()
require.NoError(t, err)
for i, ko := range idx.Offsets {
require.Equal(t, ko.Key, blockFirstKeys[i])
}
f.Close()
require.NoError(t, os.RemoveAll(filename))
}
})
}
func TestInvalidCompression(t *testing.T) {
keyPrefix := "key"
opts := Options{Compression: options.ZSTD}
f := buildTestTable(t, keyPrefix, 1000, opts)
t.Run("with correct decompression algo", func(t *testing.T) {
_, err := OpenTable(f, opts)
require.NoError(t, err)
})
t.Run("with incorrect decompression algo", func(t *testing.T) {
// Set incorrect compression algorithm.
opts.Compression = options.Snappy
_, err := OpenTable(f, opts)
require.Error(t, err)
})
}
func BenchmarkBuilder(b *testing.B) {
rand.Seed(time.Now().Unix())
key := func(i int) []byte {
return []byte(fmt.Sprintf("%032d", i))
}
val := make([]byte, 32)
rand.Read(val)
vs := y.ValueStruct{Value: []byte(val)}
keysCount := 1300000 // This number of entries consumes ~64MB of memory.
bench := func(b *testing.B, opt *Options) {
// KeyCount * (keySize + ValSize)
b.SetBytes(int64(keysCount) * (32 + 32))
for i := 0; i < b.N; i++ {
opt.BlockSize = 4 * 1024
opt.BloomFalsePositive = 0.01
builder := NewTableBuilder(*opt)
for i := 0; i < keysCount; i++ {
builder.Add(key(i), vs, 0)
}
_ = builder.Finish()
}
}
b.Run("no compression", func(b *testing.B) {
var opt Options
opt.Compression = options.None
bench(b, &opt)
})
b.Run("zstd compression", func(b *testing.B) {
var opt Options
opt.Compression = options.ZSTD
b.Run("level 1", func(b *testing.B) {
opt.ZSTDCompressionLevel = 1
bench(b, &opt)
})
b.Run("level 3", func(b *testing.B) {
opt.ZSTDCompressionLevel = 3
bench(b, &opt)
})
b.Run("level 15", func(b *testing.B) {
opt.ZSTDCompressionLevel = 15
bench(b, &opt)
})
})
}
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