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value_test.go
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value_test.go
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/*
* Copyright 2017 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 badger
import (
"bytes"
"encoding/json"
"fmt"
"io/ioutil"
"math/rand"
"os"
"reflect"
"runtime"
"sync"
"testing"
"time"
"github.com/dgraph-io/badger/v2/options"
"github.com/dgraph-io/badger/v2/y"
humanize "github.com/dustin/go-humanize"
"github.com/stretchr/testify/require"
"golang.org/x/net/trace"
)
func TestValueBasic(t *testing.T) {
dir, err := ioutil.TempDir("", "badger-test")
y.Check(err)
defer removeDir(dir)
kv, _ := Open(getTestOptions(dir).WithValueThreshold(32))
defer kv.Close()
log := &kv.vlog
// Use value big enough that the value log writes them even if SyncWrites is false.
const val1 = "sampleval012345678901234567890123"
const val2 = "samplevalb012345678901234567890123"
require.True(t, len(val1) >= kv.opt.ValueThreshold)
e1 := &Entry{
Key: []byte("samplekey"),
Value: []byte(val1),
meta: bitValuePointer,
}
e2 := &Entry{
Key: []byte("samplekeyb"),
Value: []byte(val2),
meta: bitValuePointer,
}
b := new(request)
b.Entries = []*Entry{e1, e2}
log.write([]*request{b})
require.Len(t, b.Ptrs, 2)
t.Logf("Pointer written: %+v %+v\n", b.Ptrs[0], b.Ptrs[1])
s := new(y.Slice)
buf1, lf1, err1 := log.readValueBytes(b.Ptrs[0], s)
buf2, lf2, err2 := log.readValueBytes(b.Ptrs[1], s)
require.NoError(t, err1)
require.NoError(t, err2)
defer runCallback(log.getUnlockCallback(lf1))
defer runCallback(log.getUnlockCallback(lf2))
e1, err = lf1.decodeEntry(buf1, b.Ptrs[0].Offset)
require.NoError(t, err)
e2, err = lf1.decodeEntry(buf2, b.Ptrs[1].Offset)
require.NoError(t, err)
readEntries := []Entry{*e1, *e2}
require.EqualValues(t, []Entry{
{
Key: []byte("samplekey"),
Value: []byte(val1),
meta: bitValuePointer,
offset: b.Ptrs[0].Offset,
},
{
Key: []byte("samplekeyb"),
Value: []byte(val2),
meta: bitValuePointer,
offset: b.Ptrs[1].Offset,
},
}, readEntries)
}
func TestValueGCManaged(t *testing.T) {
dir, err := ioutil.TempDir("", "badger-test")
require.NoError(t, err)
defer removeDir(dir)
N := 10000
opt := getTestOptions(dir)
opt.ValueLogMaxEntries = uint32(N / 10)
opt.managedTxns = true
db, err := Open(opt)
require.NoError(t, err)
defer db.Close()
var ts uint64
newTs := func() uint64 {
ts++
return ts
}
sz := 64 << 10
var wg sync.WaitGroup
for i := 0; i < N; i++ {
v := make([]byte, sz)
rand.Read(v[:rand.Intn(sz)])
wg.Add(1)
txn := db.NewTransactionAt(newTs(), true)
require.NoError(t, txn.SetEntry(NewEntry([]byte(fmt.Sprintf("key%d", i)), v)))
require.NoError(t, txn.CommitAt(newTs(), func(err error) {
wg.Done()
require.NoError(t, err)
}))
}
for i := 0; i < N; i++ {
wg.Add(1)
txn := db.NewTransactionAt(newTs(), true)
require.NoError(t, txn.Delete([]byte(fmt.Sprintf("key%d", i))))
require.NoError(t, txn.CommitAt(newTs(), func(err error) {
wg.Done()
require.NoError(t, err)
}))
}
wg.Wait()
files, err := ioutil.ReadDir(dir)
require.NoError(t, err)
for _, fi := range files {
t.Logf("File: %s. Size: %s\n", fi.Name(), humanize.Bytes(uint64(fi.Size())))
}
for i := 0; i < 100; i++ {
// Try at max 100 times to GC even a single value log file.
if err := db.RunValueLogGC(0.0001); err == nil {
return // Done
}
}
require.Fail(t, "Unable to GC even a single value log file.")
}
func TestValueGC(t *testing.T) {
dir, err := ioutil.TempDir("", "badger-test")
require.NoError(t, err)
defer removeDir(dir)
opt := getTestOptions(dir)
opt.ValueLogFileSize = 1 << 20
kv, _ := Open(opt)
defer kv.Close()
sz := 32 << 10
txn := kv.NewTransaction(true)
for i := 0; i < 100; i++ {
v := make([]byte, sz)
rand.Read(v[:rand.Intn(sz)])
require.NoError(t, txn.SetEntry(NewEntry([]byte(fmt.Sprintf("key%d", i)), v)))
if i%20 == 0 {
require.NoError(t, txn.Commit())
txn = kv.NewTransaction(true)
}
}
require.NoError(t, txn.Commit())
for i := 0; i < 45; i++ {
txnDelete(t, kv, []byte(fmt.Sprintf("key%d", i)))
}
kv.vlog.filesLock.RLock()
lf := kv.vlog.filesMap[kv.vlog.sortedFids()[0]]
kv.vlog.filesLock.RUnlock()
// lf.iterate(0, func(e Entry) bool {
// e.print("lf")
// return true
// })
tr := trace.New("Test", "Test")
defer tr.Finish()
kv.vlog.rewrite(lf, tr)
for i := 45; i < 100; i++ {
key := []byte(fmt.Sprintf("key%d", i))
require.NoError(t, kv.View(func(txn *Txn) error {
item, err := txn.Get(key)
require.NoError(t, err)
val := getItemValue(t, item)
require.NotNil(t, val)
require.True(t, len(val) == sz, "Size found: %d", len(val))
return nil
}))
}
}
func TestValueGC2(t *testing.T) {
dir, err := ioutil.TempDir("", "badger-test")
require.NoError(t, err)
defer removeDir(dir)
opt := getTestOptions(dir)
opt.ValueLogFileSize = 1 << 20
kv, _ := Open(opt)
defer kv.Close()
sz := 32 << 10
txn := kv.NewTransaction(true)
for i := 0; i < 100; i++ {
v := make([]byte, sz)
rand.Read(v[:rand.Intn(sz)])
require.NoError(t, txn.SetEntry(NewEntry([]byte(fmt.Sprintf("key%d", i)), v)))
if i%20 == 0 {
require.NoError(t, txn.Commit())
txn = kv.NewTransaction(true)
}
}
require.NoError(t, txn.Commit())
for i := 0; i < 5; i++ {
txnDelete(t, kv, []byte(fmt.Sprintf("key%d", i)))
}
for i := 5; i < 10; i++ {
v := []byte(fmt.Sprintf("value%d", i))
txnSet(t, kv, []byte(fmt.Sprintf("key%d", i)), v, 0)
}
kv.vlog.filesLock.RLock()
lf := kv.vlog.filesMap[kv.vlog.sortedFids()[0]]
kv.vlog.filesLock.RUnlock()
// lf.iterate(0, func(e Entry) bool {
// e.print("lf")
// return true
// })
tr := trace.New("Test", "Test")
defer tr.Finish()
kv.vlog.rewrite(lf, tr)
for i := 0; i < 5; i++ {
key := []byte(fmt.Sprintf("key%d", i))
require.NoError(t, kv.View(func(txn *Txn) error {
_, err := txn.Get(key)
require.Equal(t, ErrKeyNotFound, err)
return nil
}))
}
for i := 5; i < 10; i++ {
key := []byte(fmt.Sprintf("key%d", i))
require.NoError(t, kv.View(func(txn *Txn) error {
item, err := txn.Get(key)
require.NoError(t, err)
val := getItemValue(t, item)
require.NotNil(t, val)
require.Equal(t, string(val), fmt.Sprintf("value%d", i))
return nil
}))
}
for i := 10; i < 100; i++ {
key := []byte(fmt.Sprintf("key%d", i))
require.NoError(t, kv.View(func(txn *Txn) error {
item, err := txn.Get(key)
require.NoError(t, err)
val := getItemValue(t, item)
require.NotNil(t, val)
require.True(t, len(val) == sz, "Size found: %d", len(val))
return nil
}))
}
}
func TestValueGC3(t *testing.T) {
dir, err := ioutil.TempDir("", "badger-test")
require.NoError(t, err)
defer removeDir(dir)
opt := getTestOptions(dir)
opt.ValueLogFileSize = 1 << 20
kv, err := Open(opt)
require.NoError(t, err)
defer kv.Close()
// We want to test whether an iterator can continue through a value log GC.
valueSize := 32 << 10
var value3 []byte
txn := kv.NewTransaction(true)
for i := 0; i < 100; i++ {
v := make([]byte, valueSize) // 32K * 100 will take >=3'276'800 B.
if i == 3 {
value3 = v
}
rand.Read(v[:])
// Keys key000, key001, key002, such that sorted order matches insertion order
require.NoError(t, txn.SetEntry(NewEntry([]byte(fmt.Sprintf("key%03d", i)), v)))
if i%20 == 0 {
require.NoError(t, txn.Commit())
txn = kv.NewTransaction(true)
}
}
require.NoError(t, txn.Commit())
// Start an iterator to keys in the first value log file
itOpt := IteratorOptions{
PrefetchValues: false,
PrefetchSize: 0,
Reverse: false,
}
txn = kv.NewTransaction(true)
it := txn.NewIterator(itOpt)
defer it.Close()
// Walk a few keys
it.Rewind()
require.True(t, it.Valid())
item := it.Item()
require.Equal(t, []byte("key000"), item.Key())
it.Next()
require.True(t, it.Valid())
item = it.Item()
require.Equal(t, []byte("key001"), item.Key())
it.Next()
require.True(t, it.Valid())
item = it.Item()
require.Equal(t, []byte("key002"), item.Key())
// Like other tests, we pull out a logFile to rewrite it directly
kv.vlog.filesLock.RLock()
logFile := kv.vlog.filesMap[kv.vlog.sortedFids()[0]]
kv.vlog.filesLock.RUnlock()
tr := trace.New("Test", "Test")
defer tr.Finish()
kv.vlog.rewrite(logFile, tr)
it.Next()
require.True(t, it.Valid())
item = it.Item()
require.Equal(t, []byte("key003"), item.Key())
v3, err := item.ValueCopy(nil)
require.NoError(t, err)
require.Equal(t, value3, v3)
}
func TestValueGC4(t *testing.T) {
dir, err := ioutil.TempDir("", "badger-test")
require.NoError(t, err)
defer removeDir(dir)
opt := getTestOptions(dir)
opt.ValueLogFileSize = 1 << 20
opt.Truncate = true
kv, err := Open(opt)
require.NoError(t, err)
sz := 128 << 10 // 5 entries per value log file.
txn := kv.NewTransaction(true)
for i := 0; i < 24; i++ {
v := make([]byte, sz)
rand.Read(v[:rand.Intn(sz)])
require.NoError(t, txn.SetEntry(NewEntry([]byte(fmt.Sprintf("key%d", i)), v)))
if i%3 == 0 {
require.NoError(t, txn.Commit())
txn = kv.NewTransaction(true)
}
}
require.NoError(t, txn.Commit())
for i := 0; i < 8; i++ {
txnDelete(t, kv, []byte(fmt.Sprintf("key%d", i)))
}
for i := 8; i < 16; i++ {
v := []byte(fmt.Sprintf("value%d", i))
txnSet(t, kv, []byte(fmt.Sprintf("key%d", i)), v, 0)
}
kv.vlog.filesLock.RLock()
lf0 := kv.vlog.filesMap[kv.vlog.sortedFids()[0]]
lf1 := kv.vlog.filesMap[kv.vlog.sortedFids()[1]]
kv.vlog.filesLock.RUnlock()
// lf.iterate(0, func(e Entry) bool {
// e.print("lf")
// return true
// })
tr := trace.New("Test", "Test")
defer tr.Finish()
kv.vlog.rewrite(lf0, tr)
kv.vlog.rewrite(lf1, tr)
require.NoError(t, kv.Close())
kv, err = Open(opt)
require.NoError(t, err)
for i := 0; i < 8; i++ {
key := []byte(fmt.Sprintf("key%d", i))
require.NoError(t, kv.View(func(txn *Txn) error {
_, err := txn.Get(key)
require.Equal(t, ErrKeyNotFound, err)
return nil
}))
}
for i := 8; i < 16; i++ {
key := []byte(fmt.Sprintf("key%d", i))
require.NoError(t, kv.View(func(txn *Txn) error {
item, err := txn.Get(key)
require.NoError(t, err)
val := getItemValue(t, item)
require.NotNil(t, val)
require.Equal(t, string(val), fmt.Sprintf("value%d", i))
return nil
}))
}
require.NoError(t, kv.Close())
}
func TestPersistLFDiscardStats(t *testing.T) {
dir, err := ioutil.TempDir("", "badger-test")
require.NoError(t, err)
defer removeDir(dir)
opt := getTestOptions(dir)
opt.ValueLogFileSize = 1 << 20
opt.Truncate = true
// avoid compaction on close, so that discard map remains same
opt.CompactL0OnClose = false
db, err := Open(opt)
require.NoError(t, err)
sz := 128 << 10 // 5 entries per value log file.
v := make([]byte, sz)
rand.Read(v[:rand.Intn(sz)])
txn := db.NewTransaction(true)
for i := 0; i < 500; i++ {
require.NoError(t, txn.SetEntry(NewEntry([]byte(fmt.Sprintf("key%d", i)), v)))
if i%3 == 0 {
require.NoError(t, txn.Commit())
txn = db.NewTransaction(true)
}
}
require.NoError(t, txn.Commit(), "error while committing txn")
for i := 0; i < 500; i++ {
// use Entry.WithDiscard() to delete entries, because this causes data to be flushed on
// disk, creating SSTs. Simple Delete was having data in Memtables only.
err = db.Update(func(txn *Txn) error {
return txn.SetEntry(NewEntry([]byte(fmt.Sprintf("key%d", i)), v).WithDiscard())
})
require.NoError(t, err)
}
time.Sleep(2 * time.Second) // wait for compaction to complete
persistedMap := make(map[uint32]int64)
db.vlog.lfDiscardStats.Lock()
require.True(t, len(db.vlog.lfDiscardStats.m) > 0, "some discardStats should be generated")
for k, v := range db.vlog.lfDiscardStats.m {
persistedMap[k] = v
}
db.vlog.lfDiscardStats.updatesSinceFlush = discardStatsFlushThreshold + 1
db.vlog.lfDiscardStats.Unlock()
// db.vlog.lfDiscardStats.updatesSinceFlush is already > discardStatsFlushThreshold,
// send empty map to flushChan, so that latest discardStats map can be persisted.
db.vlog.lfDiscardStats.flushChan <- map[uint32]int64{}
time.Sleep(1 * time.Second) // Wait for map to be persisted.
err = db.Close()
require.NoError(t, err)
db, err = Open(opt)
require.NoError(t, err)
defer db.Close()
time.Sleep(1 * time.Second) // Wait for discardStats to be populated by populateDiscardStats().
db.vlog.lfDiscardStats.RLock()
require.True(t, reflect.DeepEqual(persistedMap, db.vlog.lfDiscardStats.m),
"Discard maps are not equal")
db.vlog.lfDiscardStats.RUnlock()
}
func TestChecksums(t *testing.T) {
dir, err := ioutil.TempDir("", "badger-test")
require.NoError(t, err)
defer removeDir(dir)
// Set up SST with K1=V1
opts := getTestOptions(dir)
opts.Truncate = true
opts.ValueLogFileSize = 100 * 1024 * 1024 // 100Mb
opts.ValueThreshold = 32
kv, err := Open(opts)
require.NoError(t, err)
require.NoError(t, kv.Close())
var (
k0 = []byte("k0")
k1 = []byte("k1")
k2 = []byte("k2")
k3 = []byte("k3")
v0 = []byte("value0-012345678901234567890123012345678901234567890123")
v1 = []byte("value1-012345678901234567890123012345678901234567890123")
v2 = []byte("value2-012345678901234567890123012345678901234567890123")
v3 = []byte("value3-012345678901234567890123012345678901234567890123")
)
// Make sure the value log would actually store the item
require.True(t, len(v0) >= kv.opt.ValueThreshold)
// Use a vlog with K0=V0 and a (corrupted) second transaction(k1,k2)
buf := createVlog(t, []*Entry{
{Key: k0, Value: v0},
{Key: k1, Value: v1},
{Key: k2, Value: v2},
})
buf[len(buf)-1]++ // Corrupt last byte
require.NoError(t, ioutil.WriteFile(vlogFilePath(dir, 0), buf, 0777))
// K1 should exist, but K2 shouldn't.
kv, err = Open(opts)
require.NoError(t, err)
require.NoError(t, kv.View(func(txn *Txn) error {
item, err := txn.Get(k0)
require.NoError(t, err)
require.Equal(t, getItemValue(t, item), v0)
_, err = txn.Get(k1)
require.Equal(t, ErrKeyNotFound, err)
_, err = txn.Get(k2)
require.Equal(t, ErrKeyNotFound, err)
return nil
}))
// Write K3 at the end of the vlog.
txnSet(t, kv, k3, v3, 0)
require.NoError(t, kv.Close())
// The vlog should contain K0 and K3 (K1 and k2 was lost when Badger started up
// last due to checksum failure).
kv, err = Open(opts)
require.NoError(t, err)
{
txn := kv.NewTransaction(false)
iter := txn.NewIterator(DefaultIteratorOptions)
iter.Seek(k0)
require.True(t, iter.Valid())
it := iter.Item()
require.Equal(t, it.Key(), k0)
require.Equal(t, getItemValue(t, it), v0)
iter.Next()
require.True(t, iter.Valid())
it = iter.Item()
require.Equal(t, it.Key(), k3)
require.Equal(t, getItemValue(t, it), v3)
iter.Close()
txn.Discard()
}
require.NoError(t, kv.Close())
}
func TestPartialAppendToValueLog(t *testing.T) {
dir, err := ioutil.TempDir("", "badger-test")
require.NoError(t, err)
defer removeDir(dir)
// Create skeleton files.
opts := getTestOptions(dir)
opts.Truncate = true
opts.ValueLogFileSize = 100 * 1024 * 1024 // 100Mb
opts.ValueThreshold = 32
kv, err := Open(opts)
require.NoError(t, err)
require.NoError(t, kv.Close())
var (
k0 = []byte("k0")
k1 = []byte("k1")
k2 = []byte("k2")
k3 = []byte("k3")
v0 = []byte("value0-01234567890123456789012012345678901234567890123")
v1 = []byte("value1-01234567890123456789012012345678901234567890123")
v2 = []byte("value2-01234567890123456789012012345678901234567890123")
v3 = []byte("value3-01234567890123456789012012345678901234567890123")
)
// Values need to be long enough to actually get written to value log.
require.True(t, len(v3) >= kv.opt.ValueThreshold)
// Create truncated vlog to simulate a partial append.
// k0 - single transaction, k1 and k2 in another transaction
buf := createVlog(t, []*Entry{
{Key: k0, Value: v0},
{Key: k1, Value: v1},
{Key: k2, Value: v2},
})
buf = buf[:len(buf)-6]
require.NoError(t, ioutil.WriteFile(vlogFilePath(dir, 0), buf, 0777))
// Badger should now start up
kv, err = Open(opts)
require.NoError(t, err)
require.NoError(t, kv.View(func(txn *Txn) error {
item, err := txn.Get(k0)
require.NoError(t, err)
require.Equal(t, v0, getItemValue(t, item))
_, err = txn.Get(k1)
require.Equal(t, ErrKeyNotFound, err)
_, err = txn.Get(k2)
require.Equal(t, ErrKeyNotFound, err)
return nil
}))
// When K3 is set, it should be persisted after a restart.
txnSet(t, kv, k3, v3, 0)
require.NoError(t, kv.Close())
kv, err = Open(opts)
require.NoError(t, err)
checkKeys(t, kv, [][]byte{k3})
// Replay value log from beginning, badger head is past k2.
require.NoError(t, kv.vlog.Close())
// clean up the current db.vhead so that we can replay from the beginning.
// If we don't clear the current vhead, badger will error out since new
// head passed while opening vlog is zero in the following lines.
kv.vhead = valuePointer{}
kv.vlog.init(kv)
require.NoError(
t, kv.vlog.open(kv, valuePointer{Fid: 0}, kv.replayFunction()),
)
require.NoError(t, kv.Close())
}
func TestReadOnlyOpenWithPartialAppendToValueLog(t *testing.T) {
dir, err := ioutil.TempDir("", "badger-test")
require.NoError(t, err)
defer removeDir(dir)
// Create skeleton files.
opts := getTestOptions(dir)
opts.ValueLogFileSize = 100 * 1024 * 1024 // 100Mb
kv, err := Open(opts)
require.NoError(t, err)
require.NoError(t, kv.Close())
var (
k0 = []byte("k0")
k1 = []byte("k1")
k2 = []byte("k2")
v0 = []byte("value0-012345678901234567890123")
v1 = []byte("value1-012345678901234567890123")
v2 = []byte("value2-012345678901234567890123")
)
// Create truncated vlog to simulate a partial append.
// k0 - single transaction, k1 and k2 in another transaction
buf := createVlog(t, []*Entry{
{Key: k0, Value: v0},
{Key: k1, Value: v1},
{Key: k2, Value: v2},
})
buf = buf[:len(buf)-6]
require.NoError(t, ioutil.WriteFile(vlogFilePath(dir, 0), buf, 0777))
opts.ReadOnly = true
// Badger should fail a read-only open with values to replay
_, err = Open(opts)
require.Error(t, err)
require.Regexp(t, "Database was not properly closed, cannot open read-only|Read-only mode is not supported on Windows", err.Error())
}
func TestValueLogTrigger(t *testing.T) {
t.Skip("Difficult to trigger compaction, so skipping. Re-enable after fixing #226")
dir, err := ioutil.TempDir("", "badger-test")
require.NoError(t, err)
defer removeDir(dir)
opt := getTestOptions(dir)
opt.ValueLogFileSize = 1 << 20
kv, err := Open(opt)
require.NoError(t, err)
// Write a lot of data, so it creates some work for valug log GC.
sz := 32 << 10
txn := kv.NewTransaction(true)
for i := 0; i < 100; i++ {
v := make([]byte, sz)
rand.Read(v[:rand.Intn(sz)])
require.NoError(t, txn.SetEntry(NewEntry([]byte(fmt.Sprintf("key%d", i)), v)))
if i%20 == 0 {
require.NoError(t, txn.Commit())
txn = kv.NewTransaction(true)
}
}
require.NoError(t, txn.Commit())
for i := 0; i < 45; i++ {
txnDelete(t, kv, []byte(fmt.Sprintf("key%d", i)))
}
require.NoError(t, kv.RunValueLogGC(0.5))
require.NoError(t, kv.Close())
err = kv.RunValueLogGC(0.5)
require.Equal(t, ErrRejected, err, "Error should be returned after closing DB.")
}
func createVlog(t *testing.T, entries []*Entry) []byte {
dir, err := ioutil.TempDir("", "badger-test")
require.NoError(t, err)
defer removeDir(dir)
opts := getTestOptions(dir)
opts.ValueLogFileSize = 100 * 1024 * 1024 // 100Mb
kv, err := Open(opts)
require.NoError(t, err)
txnSet(t, kv, entries[0].Key, entries[0].Value, entries[0].meta)
entries = entries[1:]
txn := kv.NewTransaction(true)
for _, entry := range entries {
require.NoError(t, txn.SetEntry(NewEntry(entry.Key, entry.Value).WithMeta(entry.meta)))
}
require.NoError(t, txn.Commit())
require.NoError(t, kv.Close())
filename := vlogFilePath(dir, 0)
buf, err := ioutil.ReadFile(filename)
require.NoError(t, err)
return buf
}
func TestPenultimateLogCorruption(t *testing.T) {
dir, err := ioutil.TempDir("", "badger-test")
require.NoError(t, err)
defer removeDir(dir)
opt := getTestOptions(dir)
opt.ValueLogLoadingMode = options.FileIO
// Each txn generates at least two entries. 3 txns will fit each file.
opt.ValueLogMaxEntries = 5
opt.LogRotatesToFlush = 1000
db0, err := Open(opt)
require.NoError(t, err)
defer func() { require.NoError(t, db0.Close()) }()
h := testHelper{db: db0, t: t}
h.writeRange(0, 7)
h.readRange(0, 7)
for i := 2; i >= 0; i-- {
fpath := vlogFilePath(dir, uint32(i))
fi, err := os.Stat(fpath)
require.NoError(t, err)
require.True(t, fi.Size() > 0, "Empty file at log=%d", i)
if i == 0 {
err := os.Truncate(fpath, fi.Size()-1)
require.NoError(t, err)
}
}
// Simulate a crash by not closing db0, but releasing the locks.
if db0.dirLockGuard != nil {
require.NoError(t, db0.dirLockGuard.release())
db0.dirLockGuard = nil
}
if db0.valueDirGuard != nil {
require.NoError(t, db0.valueDirGuard.release())
db0.valueDirGuard = nil
}
opt.Truncate = true
db1, err := Open(opt)
require.NoError(t, err)
h.db = db1
h.readRange(0, 1) // Only 2 should be gone, because it is at the end of logfile 0.
h.readRange(3, 7)
err = db1.View(func(txn *Txn) error {
_, err := txn.Get(h.key(2)) // Verify that 2 is gone.
require.Equal(t, ErrKeyNotFound, err)
return nil
})
require.NoError(t, err)
require.NoError(t, db1.Close())
}
func checkKeys(t *testing.T, kv *DB, keys [][]byte) {
i := 0
txn := kv.NewTransaction(false)
defer txn.Discard()
iter := txn.NewIterator(IteratorOptions{})
defer iter.Close()
for iter.Seek(keys[0]); iter.Valid(); iter.Next() {
require.Equal(t, iter.Item().Key(), keys[i])
i++
}
require.Equal(t, i, len(keys))
}
type testHelper struct {
db *DB
t *testing.T
val []byte
}
func (th *testHelper) key(i int) []byte {
return []byte(fmt.Sprintf("%010d", i))
}
func (th *testHelper) value() []byte {
if len(th.val) > 0 {
return th.val
}
th.val = make([]byte, 100)
y.Check2(rand.Read(th.val))
return th.val
}
// writeRange [from, to].
func (th *testHelper) writeRange(from, to int) {
for i := from; i <= to; i++ {
err := th.db.Update(func(txn *Txn) error {
return txn.SetEntry(NewEntry(th.key(i), th.value()))
})
require.NoError(th.t, err)
}
}
func (th *testHelper) readRange(from, to int) {
for i := from; i <= to; i++ {
err := th.db.View(func(txn *Txn) error {
item, err := txn.Get(th.key(i))
if err != nil {
return err
}
return item.Value(func(val []byte) error {
require.Equal(th.t, val, th.value(), "key=%q", th.key(i))
return nil
})
})
require.NoError(th.t, err, "key=%q", th.key(i))
}
}
// Test Bug #578, which showed that if a value is moved during value log GC, an
// older version can end up at a higher level in the LSM tree than a newer
// version, causing the data to not be returned.
func TestBug578(t *testing.T) {
dir, err := ioutil.TempDir("", "badger-test")
y.Check(err)
defer removeDir(dir)
db, err := Open(DefaultOptions(dir).
WithValueLogMaxEntries(64).
WithMaxTableSize(1 << 13))
require.NoError(t, err)
h := testHelper{db: db, t: t}
// Let's run this whole thing a few times.
for j := 0; j < 10; j++ {
t.Logf("Cycle: %d\n", j)
h.writeRange(0, 32)
h.writeRange(0, 10)
h.writeRange(50, 72)
h.writeRange(40, 72)
h.writeRange(40, 72)
// Run value log GC a few times.
for i := 0; i < 5; i++ {
db.RunValueLogGC(0.5)
}
h.readRange(0, 10)
}
require.NoError(t, db.Close())
}
func BenchmarkReadWrite(b *testing.B) {
rwRatio := []float32{
0.1, 0.2, 0.5, 1.0,
}
valueSize := []int{
64, 128, 256, 512, 1024, 2048, 4096, 8192, 16384,
}
for _, vsz := range valueSize {
for _, rw := range rwRatio {
b.Run(fmt.Sprintf("%3.1f,%04d", rw, vsz), func(b *testing.B) {
dir, err := ioutil.TempDir("", "vlog-benchmark")
y.Check(err)
defer removeDir(dir)
db, err := Open(getTestOptions(dir))
y.Check(err)
vl := &db.vlog
b.ResetTimer()
for i := 0; i < b.N; i++ {
e := new(Entry)
e.Key = make([]byte, 16)
e.Value = make([]byte, vsz)
bl := new(request)
bl.Entries = []*Entry{e}
var ptrs []valuePointer
vl.write([]*request{bl})
ptrs = append(ptrs, bl.Ptrs...)
f := rand.Float32()
if f < rw {
vl.write([]*request{bl})
} else {
ln := len(ptrs)
if ln == 0 {
b.Fatalf("Zero length of ptrs")
}
idx := rand.Intn(ln)
s := new(y.Slice)
buf, lf, err := vl.readValueBytes(ptrs[idx], s)
if err != nil {
b.Fatalf("Benchmark Read: %v", err)
}
e, err := lf.decodeEntry(buf, ptrs[idx].Offset)
require.NoError(b, err)
if len(e.Key) != 16 {
b.Fatalf("Key is invalid")
}
if len(e.Value) != vsz {
b.Fatalf("Value is invalid")
}
runCallback(db.vlog.getUnlockCallback(lf))
}
}
})
}
}
}
// Regression test for https://github.com/dgraph-io/badger/issues/817
func TestValueLogTruncate(t *testing.T) {
dir, err := ioutil.TempDir("", "badger-test")
require.NoError(t, err)
defer removeDir(dir)
db, err := Open(DefaultOptions(dir).WithTruncate(true))
require.NoError(t, err)
// Insert 1 entry so that we have valid data in first vlog file
require.NoError(t, db.Update(func(txn *Txn) error {
return txn.Set([]byte("foo"), nil)
}))
fileCountBeforeCorruption := len(db.vlog.filesMap)
require.NoError(t, db.Close())
// Create two vlog files corrupted data. These will be truncated when DB starts next time
require.NoError(t, ioutil.WriteFile(vlogFilePath(dir, 1), []byte("foo"), 0664))
require.NoError(t, ioutil.WriteFile(vlogFilePath(dir, 2), []byte("foo"), 0664))
db, err = Open(DefaultOptions(dir).WithTruncate(true))
require.NoError(t, err)
// Ensure vlog file with id=1 is not present
require.Nil(t, db.vlog.filesMap[1])
// Ensure filesize of fid=2 is zero
zeroFile, ok := db.vlog.filesMap[2]
require.True(t, ok)
fileStat, err := zeroFile.fd.Stat()
require.NoError(t, err)
// The size of last vlog file in windows is equal to 2*opt.ValueLogFileSize. This is because