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stream_test.go
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stream_test.go
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/*
* Copyright 2018 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 (
"context"
"fmt"
"io/ioutil"
"math"
"strconv"
"strings"
"testing"
"github.com/dgraph-io/badger/v2/pb"
bpb "github.com/dgraph-io/badger/v2/pb"
"github.com/dgraph-io/badger/v2/y"
"github.com/dgraph-io/ristretto/z"
"github.com/golang/protobuf/proto"
"github.com/stretchr/testify/require"
)
func keyWithPrefix(prefix string, k int) []byte {
return []byte(fmt.Sprintf("%s-%d", prefix, k))
}
func keyToInt(k []byte) (string, int) {
splits := strings.Split(string(k), "-")
key, err := strconv.Atoi(splits[1])
y.Check(err)
return splits[0], key
}
func value(k int) []byte {
return []byte(fmt.Sprintf("%08d", k))
}
type collector struct {
kv []*bpb.KV
}
func (c *collector) Send(buf *z.Buffer) error {
list, err := BufferToKVList(buf)
if err != nil {
return err
}
for _, kv := range list.Kv {
if kv.StreamDone == true {
return nil
}
cp := proto.Clone(kv).(*bpb.KV)
c.kv = append(c.kv, cp)
}
return err
}
var ctxb = context.Background()
func TestStream(t *testing.T) {
dir, err := ioutil.TempDir("", "badger-test")
require.NoError(t, err)
defer removeDir(dir)
db, err := OpenManaged(DefaultOptions(dir))
require.NoError(t, err)
var count int
for _, prefix := range []string{"p0", "p1", "p2"} {
txn := db.NewTransactionAt(math.MaxUint64, true)
for i := 1; i <= 100; i++ {
require.NoError(t, txn.SetEntry(NewEntry(keyWithPrefix(prefix, i), value(i))))
count++
}
require.NoError(t, txn.CommitAt(5, nil))
}
stream := db.NewStreamAt(math.MaxUint64)
stream.LogPrefix = "Testing"
c := &collector{}
stream.Send = c.Send
// Test case 1. Retrieve everything.
err = stream.Orchestrate(ctxb)
require.NoError(t, err)
require.Equal(t, 300, len(c.kv), "Expected 300. Got: %d", len(c.kv))
m := make(map[string]int)
for _, kv := range c.kv {
prefix, ki := keyToInt(kv.Key)
expected := value(ki)
require.Equal(t, expected, kv.Value)
m[prefix]++
}
require.Equal(t, 3, len(m))
for pred, count := range m {
require.Equal(t, 100, count, "Count mismatch for pred: %s", pred)
}
// Test case 2. Retrieve only 1 predicate.
stream.Prefix = []byte("p1")
c.kv = c.kv[:0]
err = stream.Orchestrate(ctxb)
require.NoError(t, err)
require.Equal(t, 100, len(c.kv), "Expected 100. Got: %d", len(c.kv))
m = make(map[string]int)
for _, kv := range c.kv {
prefix, ki := keyToInt(kv.Key)
expected := value(ki)
require.Equal(t, expected, kv.Value)
m[prefix]++
}
require.Equal(t, 1, len(m))
for pred, count := range m {
require.Equal(t, 100, count, "Count mismatch for pred: %s", pred)
}
// Test case 3. Retrieve select keys within the predicate.
c.kv = c.kv[:0]
stream.ChooseKey = func(item *Item) bool {
_, k := keyToInt(item.Key())
return k%2 == 0
}
err = stream.Orchestrate(ctxb)
require.NoError(t, err)
require.Equal(t, 50, len(c.kv), "Expected 50. Got: %d", len(c.kv))
m = make(map[string]int)
for _, kv := range c.kv {
prefix, ki := keyToInt(kv.Key)
expected := value(ki)
require.Equal(t, expected, kv.Value)
m[prefix]++
}
require.Equal(t, 1, len(m))
for pred, count := range m {
require.Equal(t, 50, count, "Count mismatch for pred: %s", pred)
}
// Test case 4. Retrieve select keys from all predicates.
c.kv = c.kv[:0]
stream.Prefix = []byte{}
err = stream.Orchestrate(ctxb)
require.NoError(t, err)
require.Equal(t, 150, len(c.kv), "Expected 150. Got: %d", len(c.kv))
m = make(map[string]int)
for _, kv := range c.kv {
prefix, ki := keyToInt(kv.Key)
expected := value(ki)
require.Equal(t, expected, kv.Value)
m[prefix]++
}
require.Equal(t, 3, len(m))
for pred, count := range m {
require.Equal(t, 50, count, "Count mismatch for pred: %s", pred)
}
require.NoError(t, db.Close())
}
func TestStreamWithThreadId(t *testing.T) {
dir, err := ioutil.TempDir("", "badger-test")
require.NoError(t, err)
defer removeDir(dir)
db, err := OpenManaged(DefaultOptions(dir))
require.NoError(t, err)
var count int
for _, prefix := range []string{"p0", "p1", "p2"} {
txn := db.NewTransactionAt(math.MaxUint64, true)
for i := 1; i <= 100; i++ {
require.NoError(t, txn.SetEntry(NewEntry(keyWithPrefix(prefix, i), value(i))))
count++
}
require.NoError(t, txn.CommitAt(5, nil))
}
stream := db.NewStreamAt(math.MaxUint64)
stream.LogPrefix = "Testing"
stream.KeyToList = func(key []byte, itr *Iterator) (
*bpb.KVList, error) {
require.Less(t, itr.ThreadId, stream.NumGo)
return stream.ToList(key, itr)
}
c := &collector{}
stream.Send = c.Send
err = stream.Orchestrate(ctxb)
require.NoError(t, err)
require.Equal(t, 300, len(c.kv), "Expected 300. Got: %d", len(c.kv))
m := make(map[string]int)
for _, kv := range c.kv {
prefix, ki := keyToInt(kv.Key)
expected := value(ki)
require.Equal(t, expected, kv.Value)
m[prefix]++
}
require.Equal(t, 3, len(m))
for pred, count := range m {
require.Equal(t, 100, count, "Count mismatch for pred: %s", pred)
}
require.NoError(t, db.Close())
}
func TestBigStream(t *testing.T) {
if !*manual {
t.Skip("Skipping test meant to be run manually.")
return
}
// Set the maxStreamSize to 1MB for the duration of the test so that the it can use a smaller
// dataset than it would otherwise need.
originalMaxStreamSize := maxStreamSize
maxStreamSize = 1 << 20
defer func() {
maxStreamSize = originalMaxStreamSize
}()
testSize := int(1e6)
dir, err := ioutil.TempDir("", "badger-big-test")
require.NoError(t, err)
defer removeDir(dir)
db, err := OpenManaged(DefaultOptions(dir))
require.NoError(t, err)
var count int
wb := db.NewWriteBatchAt(5)
for _, prefix := range []string{"p0", "p1", "p2"} {
for i := 1; i <= testSize; i++ {
require.NoError(t, wb.SetEntry(NewEntry(keyWithPrefix(prefix, i), value(i))))
count++
}
}
require.NoError(t, wb.Flush())
stream := db.NewStreamAt(math.MaxUint64)
stream.LogPrefix = "Testing"
c := &collector{}
stream.Send = c.Send
// Test case 1. Retrieve everything.
err = stream.Orchestrate(ctxb)
require.NoError(t, err)
require.Equal(t, 3*testSize, len(c.kv), "Expected 30000. Got: %d", len(c.kv))
m := make(map[string]int)
for _, kv := range c.kv {
prefix, ki := keyToInt(kv.Key)
expected := value(ki)
require.Equal(t, expected, kv.Value)
m[prefix]++
}
require.Equal(t, 3, len(m))
for pred, count := range m {
require.Equal(t, testSize, count, "Count mismatch for pred: %s", pred)
}
require.NoError(t, db.Close())
}
// There was a bug in the stream writer code which would cause allocators to be
// freed up twice if the default keyToList was not used. This test verifies that issue.
func TestStreamCustomKeyToList(t *testing.T) {
dir, err := ioutil.TempDir("", "badger-test")
require.NoError(t, err)
defer removeDir(dir)
db, err := OpenManaged(DefaultOptions(dir))
require.NoError(t, err)
var count int
for _, key := range []string{"p0", "p1", "p2"} {
for i := 1; i <= 100; i++ {
txn := db.NewTransactionAt(math.MaxUint64, true)
require.NoError(t, txn.SetEntry(NewEntry([]byte(key), value(i))))
count++
require.NoError(t, txn.CommitAt(uint64(i), nil))
}
}
stream := db.NewStreamAt(math.MaxUint64)
stream.LogPrefix = "Testing"
stream.KeyToList = func(key []byte, itr *Iterator) (*pb.KVList, error) {
item := itr.Item()
val, err := item.ValueCopy(nil)
if err != nil {
return nil, err
}
kv := &pb.KV{
Key: y.Copy(item.Key()),
Value: val,
}
return &pb.KVList{
Kv: []*pb.KV{kv},
}, nil
}
res := map[string]struct{}{"p0": {}, "p1": {}, "p2": {}}
stream.Send = func(buf *z.Buffer) error {
list, err := BufferToKVList(buf)
require.NoError(t, err)
for _, kv := range list.Kv {
key := string(kv.Key)
if _, ok := res[key]; !ok {
panic(fmt.Sprintf("%s key not found", key))
}
delete(res, key)
}
return nil
}
require.NoError(t, stream.Orchestrate(ctxb))
require.Zero(t, len(res))
}