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ceremonyclient/pebble/iterator_test.go
Cassandra Heart 2e2a1e4789
v1.2.0 (#31)
2024-01-03 01:31:42 -06:00

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// Copyright 2013 The LevelDB-Go and Pebble Authors. All rights reserved. Use
// of this source code is governed by a BSD-style license that can be found in
// the LICENSE file.
package pebble
import (
"bytes"
"context"
"flag"
"fmt"
"io"
"runtime"
"sort"
"strconv"
"strings"
"testing"
"time"
"github.com/cockroachdb/datadriven"
"github.com/cockroachdb/errors"
"github.com/cockroachdb/pebble/internal/base"
"github.com/cockroachdb/pebble/internal/bytealloc"
"github.com/cockroachdb/pebble/internal/invalidating"
"github.com/cockroachdb/pebble/internal/keyspan"
"github.com/cockroachdb/pebble/internal/manifest"
"github.com/cockroachdb/pebble/internal/testkeys"
"github.com/cockroachdb/pebble/objstorage/objstorageprovider"
"github.com/cockroachdb/pebble/sstable"
"github.com/cockroachdb/pebble/vfs"
"github.com/stretchr/testify/require"
"golang.org/x/exp/rand"
)
var testKeyValuePairs = []string{
"10:10",
"11:11",
"12:12",
"13:13",
"14:14",
"15:15",
"16:16",
"17:17",
"18:18",
"19:19",
}
type fakeIter struct {
lower []byte
upper []byte
keys []InternalKey
vals [][]byte
index int
valid bool
closeErr error
}
// fakeIter implements the base.InternalIterator interface.
var _ base.InternalIterator = (*fakeIter)(nil)
func fakeIkey(s string) InternalKey {
j := strings.Index(s, ":")
seqNum, err := strconv.Atoi(s[j+1:])
if err != nil {
panic(err)
}
return base.MakeInternalKey([]byte(s[:j]), uint64(seqNum), InternalKeyKindSet)
}
func newFakeIterator(closeErr error, keys ...string) *fakeIter {
ikeys := make([]InternalKey, len(keys))
for i, k := range keys {
ikeys[i] = fakeIkey(k)
}
return &fakeIter{
keys: ikeys,
index: 0,
valid: len(ikeys) > 0,
closeErr: closeErr,
}
}
func (f *fakeIter) String() string {
return "fake"
}
func (f *fakeIter) SeekGE(key []byte, flags base.SeekGEFlags) (*InternalKey, base.LazyValue) {
f.valid = false
for f.index = 0; f.index < len(f.keys); f.index++ {
if DefaultComparer.Compare(key, f.key().UserKey) <= 0 {
if f.upper != nil && DefaultComparer.Compare(f.upper, f.key().UserKey) <= 0 {
return nil, base.LazyValue{}
}
f.valid = true
return f.Key(), f.Value()
}
}
return nil, base.LazyValue{}
}
func (f *fakeIter) SeekPrefixGE(
prefix, key []byte, flags base.SeekGEFlags,
) (*base.InternalKey, base.LazyValue) {
return f.SeekGE(key, flags)
}
func (f *fakeIter) SeekLT(key []byte, flags base.SeekLTFlags) (*InternalKey, base.LazyValue) {
f.valid = false
for f.index = len(f.keys) - 1; f.index >= 0; f.index-- {
if DefaultComparer.Compare(key, f.key().UserKey) > 0 {
if f.lower != nil && DefaultComparer.Compare(f.lower, f.key().UserKey) > 0 {
return nil, base.LazyValue{}
}
f.valid = true
return f.Key(), f.Value()
}
}
return nil, base.LazyValue{}
}
func (f *fakeIter) First() (*InternalKey, base.LazyValue) {
f.valid = false
f.index = -1
if key, _ := f.Next(); key == nil {
return nil, base.LazyValue{}
}
if f.upper != nil && DefaultComparer.Compare(f.upper, f.key().UserKey) <= 0 {
return nil, base.LazyValue{}
}
f.valid = true
return f.Key(), f.Value()
}
func (f *fakeIter) Last() (*InternalKey, base.LazyValue) {
f.valid = false
f.index = len(f.keys)
if key, _ := f.Prev(); key == nil {
return nil, base.LazyValue{}
}
if f.lower != nil && DefaultComparer.Compare(f.lower, f.key().UserKey) > 0 {
return nil, base.LazyValue{}
}
f.valid = true
return f.Key(), f.Value()
}
func (f *fakeIter) Next() (*InternalKey, base.LazyValue) {
f.valid = false
if f.index == len(f.keys) {
return nil, base.LazyValue{}
}
f.index++
if f.index == len(f.keys) {
return nil, base.LazyValue{}
}
if f.upper != nil && DefaultComparer.Compare(f.upper, f.key().UserKey) <= 0 {
return nil, base.LazyValue{}
}
f.valid = true
return f.Key(), f.Value()
}
func (f *fakeIter) Prev() (*InternalKey, base.LazyValue) {
f.valid = false
if f.index < 0 {
return nil, base.LazyValue{}
}
f.index--
if f.index < 0 {
return nil, base.LazyValue{}
}
if f.lower != nil && DefaultComparer.Compare(f.lower, f.key().UserKey) > 0 {
return nil, base.LazyValue{}
}
f.valid = true
return f.Key(), f.Value()
}
func (f *fakeIter) NextPrefix(succKey []byte) (*InternalKey, base.LazyValue) {
return f.SeekGE(succKey, base.SeekGEFlagsNone)
}
// key returns the current Key the iterator is positioned at regardless of the
// value of f.valid.
func (f *fakeIter) key() *InternalKey {
return &f.keys[f.index]
}
func (f *fakeIter) Key() *InternalKey {
if f.valid {
return &f.keys[f.index]
}
// It is invalid to call Key() when Valid() returns false. Rather than
// returning nil here which would technically be more correct, return a
// non-nil key which is the behavior of some InternalIterator
// implementations. This provides better testing of users of
// InternalIterators.
if f.index < 0 {
return &f.keys[0]
}
return &f.keys[len(f.keys)-1]
}
func (f *fakeIter) Value() base.LazyValue {
if f.index >= 0 && f.index < len(f.vals) {
return base.MakeInPlaceValue(f.vals[f.index])
}
return base.LazyValue{}
}
func (f *fakeIter) Valid() bool {
return f.index >= 0 && f.index < len(f.keys) && f.valid
}
func (f *fakeIter) Error() error {
return f.closeErr
}
func (f *fakeIter) Close() error {
return f.closeErr
}
func (f *fakeIter) SetBounds(lower, upper []byte) {
f.lower = lower
f.upper = upper
}
func (f *fakeIter) SetContext(_ context.Context) {}
// testIterator tests creating a combined iterator from a number of sub-
// iterators. newFunc is a constructor function. splitFunc returns a random
// split of the testKeyValuePairs slice such that walking a combined iterator
// over those splits should recover the original key/value pairs in order.
func testIterator(
t *testing.T,
newFunc func(...internalIterator) internalIterator,
splitFunc func(r *rand.Rand) [][]string,
) {
// Test pre-determined sub-iterators. The sub-iterators are designed
// so that the combined key/value pair order is the same whether the
// combined iterator is concatenating or merging.
testCases := []struct {
desc string
iters []internalIterator
want string
}{
{
"one sub-iterator",
[]internalIterator{
newFakeIterator(nil, "e:1", "w:2"),
},
"<e:1><w:2>.",
},
{
"two sub-iterators",
[]internalIterator{
newFakeIterator(nil, "a0:0"),
newFakeIterator(nil, "b1:1", "b2:2"),
},
"<a0:0><b1:1><b2:2>.",
},
{
"empty sub-iterators",
[]internalIterator{
newFakeIterator(nil),
newFakeIterator(nil),
newFakeIterator(nil),
},
".",
},
{
"sub-iterator errors",
[]internalIterator{
newFakeIterator(nil, "a0:0", "a1:1"),
newFakeIterator(errors.New("the sky is falling"), "b2:2", "b3:3", "b4:4"),
newFakeIterator(errors.New("run for your lives"), "c5:5", "c6:6"),
},
"<a0:0><a1:1><b2:2><b3:3><b4:4>err=the sky is falling",
},
}
for _, tc := range testCases {
var b bytes.Buffer
iter := invalidating.NewIter(newFunc(tc.iters...))
for key, _ := iter.First(); key != nil; key, _ = iter.Next() {
fmt.Fprintf(&b, "<%s:%d>", key.UserKey, key.SeqNum())
}
if err := iter.Close(); err != nil {
fmt.Fprintf(&b, "err=%v", err)
} else {
b.WriteByte('.')
}
if got := b.String(); got != tc.want {
t.Errorf("%s:\ngot %q\nwant %q", tc.desc, got, tc.want)
}
}
// Test randomly generated sub-iterators.
r := rand.New(rand.NewSource(0))
for i, nBad := 0, 0; i < 1000; i++ {
bad := false
splits := splitFunc(r)
iters := make([]internalIterator, len(splits))
for i, split := range splits {
iters[i] = newFakeIterator(nil, split...)
}
iter := newInternalIterAdapter(invalidating.NewIter(newFunc(iters...)))
iter.First()
j := 0
for ; iter.Valid() && j < len(testKeyValuePairs); j++ {
got := fmt.Sprintf("%s:%d", iter.Key().UserKey, iter.Key().SeqNum())
want := testKeyValuePairs[j]
if got != want {
bad = true
t.Errorf("random splits: i=%d, j=%d: got %q, want %q", i, j, got, want)
}
iter.Next()
}
if iter.Valid() {
bad = true
t.Errorf("random splits: i=%d, j=%d: iter was not exhausted", i, j)
}
if j != len(testKeyValuePairs) {
bad = true
t.Errorf("random splits: i=%d, j=%d: want j=%d", i, j, len(testKeyValuePairs))
return
}
if err := iter.Close(); err != nil {
bad = true
t.Errorf("random splits: i=%d, j=%d: %v", i, j, err)
}
if bad {
nBad++
if nBad == 10 {
t.Fatal("random splits: too many errors; stopping")
}
}
}
}
// deletableSumValueMerger computes the sum of its arguments,
// but transforms a zero sum into a non-existent entry.
type deletableSumValueMerger struct {
sum int64
}
func newDeletableSumValueMerger(key, value []byte) (ValueMerger, error) {
m := &deletableSumValueMerger{}
return m, m.MergeNewer(value)
}
func (m *deletableSumValueMerger) parseAndCalculate(value []byte) error {
v, err := strconv.ParseInt(string(value), 10, 64)
if err == nil {
m.sum += v
}
return err
}
func (m *deletableSumValueMerger) MergeNewer(value []byte) error {
return m.parseAndCalculate(value)
}
func (m *deletableSumValueMerger) MergeOlder(value []byte) error {
return m.parseAndCalculate(value)
}
func (m *deletableSumValueMerger) Finish(includesBase bool) ([]byte, io.Closer, error) {
if m.sum == 0 {
return nil, nil, nil
}
return []byte(strconv.FormatInt(m.sum, 10)), nil, nil
}
func (m *deletableSumValueMerger) DeletableFinish(
includesBase bool,
) ([]byte, bool, io.Closer, error) {
value, closer, err := m.Finish(includesBase)
return value, len(value) == 0, closer, err
}
func TestIterator(t *testing.T) {
var merge Merge
var keys []InternalKey
var vals [][]byte
newIter := func(seqNum uint64, opts IterOptions) *Iterator {
if merge == nil {
merge = DefaultMerger.Merge
}
wrappedMerge := func(key, value []byte) (ValueMerger, error) {
if len(key) == 0 {
t.Fatalf("an empty key is passed into Merge")
}
return merge(key, value)
}
it := &Iterator{
opts: opts,
comparer: *testkeys.Comparer,
merge: wrappedMerge,
}
// NB: Use a mergingIter to filter entries newer than seqNum.
iter := newMergingIter(nil /* logger */, &it.stats.InternalStats, it.cmp, it.split, &fakeIter{
lower: opts.GetLowerBound(),
upper: opts.GetUpperBound(),
keys: keys,
vals: vals,
})
iter.snapshot = seqNum
// NB: This Iterator cannot be cloned since it is not constructed
// with a readState. It suffices for this test.
it.iter = invalidating.NewIter(iter)
return it
}
datadriven.RunTest(t, "testdata/iterator", func(t *testing.T, d *datadriven.TestData) string {
switch d.Cmd {
case "define":
merge = nil
if arg, ok := d.Arg("merger"); ok && len(arg.Vals[0]) > 0 && arg.Vals[0] == "deletable" {
merge = newDeletableSumValueMerger
}
keys = keys[:0]
vals = vals[:0]
for _, key := range strings.Split(d.Input, "\n") {
j := strings.Index(key, ":")
keys = append(keys, base.ParseInternalKey(key[:j]))
vals = append(vals, []byte(key[j+1:]))
}
return ""
case "iter":
var seqNum uint64
var opts IterOptions
d.MaybeScanArgs(t, "seq", &seqNum)
var lower, upper string
if d.MaybeScanArgs(t, "lower", &lower) {
opts.LowerBound = []byte(lower)
}
if d.MaybeScanArgs(t, "upper", &upper) {
opts.UpperBound = []byte(upper)
}
iter := newIter(seqNum, opts)
iterOutput := runIterCmd(d, iter, true)
stats := iter.Stats()
return fmt.Sprintf("%sstats: %s\n", iterOutput, stats.String())
default:
return fmt.Sprintf("unknown command: %s", d.Cmd)
}
})
}
type minSeqNumPropertyCollector struct {
minSeqNum uint64
}
func (c *minSeqNumPropertyCollector) Add(key InternalKey, value []byte) error {
if c.minSeqNum == 0 || c.minSeqNum > key.SeqNum() {
c.minSeqNum = key.SeqNum()
}
return nil
}
func (c *minSeqNumPropertyCollector) Finish(userProps map[string]string) error {
userProps["test.min-seq-num"] = fmt.Sprint(c.minSeqNum)
return nil
}
func (c *minSeqNumPropertyCollector) Name() string {
return "minSeqNumPropertyCollector"
}
func TestReadSampling(t *testing.T) {
var d *DB
defer func() {
if d != nil {
require.NoError(t, d.Close())
}
}()
var iter *Iterator
defer func() {
if iter != nil {
require.NoError(t, iter.Close())
}
}()
datadriven.RunTest(t, "testdata/iterator_read_sampling", func(t *testing.T, td *datadriven.TestData) string {
switch td.Cmd {
case "define":
if iter != nil {
if err := iter.Close(); err != nil {
return err.Error()
}
}
if d != nil {
if err := d.Close(); err != nil {
return err.Error()
}
}
opts := &Options{}
opts.TablePropertyCollectors = append(opts.TablePropertyCollectors,
func() TablePropertyCollector {
return &minSeqNumPropertyCollector{}
})
var err error
if d, err = runDBDefineCmd(td, opts); err != nil {
return err.Error()
}
d.mu.Lock()
// Disable the "dynamic base level" code for this test.
// d.mu.versions.picker.forceBaseLevel1()
s := d.mu.versions.currentVersion().String()
d.mu.Unlock()
return s
case "set":
if d == nil {
return fmt.Sprintf("%s: db is not defined", td.Cmd)
}
var allowedSeeks int64
td.ScanArgs(t, "allowed-seeks", &allowedSeeks)
d.mu.Lock()
for _, l := range d.mu.versions.currentVersion().Levels {
l.Slice().Each(func(f *fileMetadata) {
f.AllowedSeeks.Store(allowedSeeks)
})
}
d.mu.Unlock()
return ""
case "show":
if d == nil {
return fmt.Sprintf("%s: db is not defined", td.Cmd)
}
var fileNum int64
for _, arg := range td.CmdArgs {
if len(arg.Vals) != 2 {
return fmt.Sprintf("%s: %s=<value>", td.Cmd, arg.Key)
}
switch arg.Key {
case "allowed-seeks":
var err error
fileNum, err = strconv.ParseInt(arg.Vals[0], 10, 64)
if err != nil {
return err.Error()
}
}
}
var foundAllowedSeeks int64 = -1
d.mu.Lock()
for _, l := range d.mu.versions.currentVersion().Levels {
l.Slice().Each(func(f *fileMetadata) {
if f.FileNum == base.FileNum(fileNum) {
actualAllowedSeeks := f.AllowedSeeks.Load()
foundAllowedSeeks = actualAllowedSeeks
}
})
}
d.mu.Unlock()
if foundAllowedSeeks == -1 {
return fmt.Sprintf("invalid file num: %d", fileNum)
}
return fmt.Sprintf("%d", foundAllowedSeeks)
case "iter":
if iter == nil || iter.iter == nil {
// TODO(peter): runDBDefineCmd doesn't properly update the visible
// sequence number. So we have to use a snapshot with a very large
// sequence number, otherwise the DB appears empty.
snap := Snapshot{
db: d,
seqNum: InternalKeySeqNumMax,
}
iter, _ = snap.NewIter(nil)
iter.readSampling.forceReadSampling = true
}
return runIterCmd(td, iter, false)
case "read-compactions":
if d == nil {
return fmt.Sprintf("%s: db is not defined", td.Cmd)
}
d.mu.Lock()
var sb strings.Builder
if d.mu.compact.readCompactions.size == 0 {
sb.WriteString("(none)")
}
for i := 0; i < d.mu.compact.readCompactions.size; i++ {
rc := d.mu.compact.readCompactions.at(i)
sb.WriteString(fmt.Sprintf("(level: %d, start: %s, end: %s)\n", rc.level, string(rc.start), string(rc.end)))
}
d.mu.Unlock()
return sb.String()
case "iter-read-compactions":
if iter == nil {
return fmt.Sprintf("%s: iter is not defined", td.Cmd)
}
var sb strings.Builder
if iter.readSampling.pendingCompactions.size == 0 {
sb.WriteString("(none)")
}
for i := 0; i < iter.readSampling.pendingCompactions.size; i++ {
rc := iter.readSampling.pendingCompactions.at(i)
sb.WriteString(fmt.Sprintf("(level: %d, start: %s, end: %s)\n", rc.level, string(rc.start), string(rc.end)))
}
return sb.String()
case "close-iter":
if iter != nil {
if err := iter.Close(); err != nil {
return err.Error()
}
}
return ""
default:
return fmt.Sprintf("unknown command: %s", td.Cmd)
}
})
}
func TestIteratorTableFilter(t *testing.T) {
var d *DB
defer func() {
if d != nil {
require.NoError(t, d.Close())
}
}()
datadriven.RunTest(t, "testdata/iterator_table_filter", func(t *testing.T, td *datadriven.TestData) string {
switch td.Cmd {
case "define":
if d != nil {
if err := d.Close(); err != nil {
return err.Error()
}
}
opts := &Options{}
opts.TablePropertyCollectors = append(opts.TablePropertyCollectors,
func() TablePropertyCollector {
return &minSeqNumPropertyCollector{}
})
var err error
if d, err = runDBDefineCmd(td, opts); err != nil {
return err.Error()
}
d.mu.Lock()
// Disable the "dynamic base level" code for this test.
d.mu.versions.picker.forceBaseLevel1()
s := d.mu.versions.currentVersion().String()
d.mu.Unlock()
return s
case "iter":
// We're using an iterator table filter to approximate what is done by
// snapshots.
iterOpts := &IterOptions{}
var filterSeqNum uint64
if td.MaybeScanArgs(t, "filter", &filterSeqNum) {
iterOpts.TableFilter = func(userProps map[string]string) bool {
minSeqNum, err := strconv.ParseUint(userProps["test.min-seq-num"], 10, 64)
if err != nil {
return true
}
return minSeqNum < filterSeqNum
}
}
// TODO(peter): runDBDefineCmd doesn't properly update the visible
// sequence number. So we have to use a snapshot with a very large
// sequence number, otherwise the DB appears empty.
snap := Snapshot{
db: d,
seqNum: InternalKeySeqNumMax,
}
iter, _ := snap.NewIter(iterOpts)
return runIterCmd(td, iter, true)
default:
return fmt.Sprintf("unknown command: %s", td.Cmd)
}
})
}
func TestIteratorNextPrev(t *testing.T) {
var mem vfs.FS
var d *DB
defer func() {
require.NoError(t, d.Close())
}()
reset := func() {
if d != nil {
require.NoError(t, d.Close())
}
mem = vfs.NewMem()
require.NoError(t, mem.MkdirAll("ext", 0755))
opts := &Options{FS: mem}
// Automatic compactions may compact away tombstones from L6, making
// some testcases non-deterministic.
opts.DisableAutomaticCompactions = true
var err error
d, err = Open("", opts)
require.NoError(t, err)
}
reset()
datadriven.RunTest(t, "testdata/iterator_next_prev", func(t *testing.T, td *datadriven.TestData) string {
switch td.Cmd {
case "reset":
reset()
return ""
case "build":
if err := runBuildCmd(td, d, mem); err != nil {
return err.Error()
}
return ""
case "ingest":
if err := runIngestCmd(td, d, mem); err != nil {
return err.Error()
}
return runLSMCmd(td, d)
case "iter":
snap := Snapshot{
db: d,
seqNum: InternalKeySeqNumMax,
}
td.MaybeScanArgs(t, "seq", &snap.seqNum)
iter, _ := snap.NewIter(nil)
return runIterCmd(td, iter, true)
default:
return fmt.Sprintf("unknown command: %s", td.Cmd)
}
})
}
func TestIteratorStats(t *testing.T) {
var mem vfs.FS
var d *DB
defer func() {
require.NoError(t, d.Close())
}()
reset := func() {
if d != nil {
require.NoError(t, d.Close())
}
mem = vfs.NewMem()
require.NoError(t, mem.MkdirAll("ext", 0755))
opts := &Options{Comparer: testkeys.Comparer, FS: mem, FormatMajorVersion: internalFormatNewest}
// Automatic compactions may make some testcases non-deterministic.
opts.DisableAutomaticCompactions = true
var err error
d, err = Open("", opts)
require.NoError(t, err)
}
reset()
datadriven.RunTest(t, "testdata/iterator_stats", func(t *testing.T, td *datadriven.TestData) string {
switch td.Cmd {
case "reset":
reset()
return ""
case "build":
if err := runBuildCmd(td, d, mem); err != nil {
return err.Error()
}
return ""
case "ingest":
if err := runIngestCmd(td, d, mem); err != nil {
return err.Error()
}
return runLSMCmd(td, d)
case "iter":
snap := Snapshot{
db: d,
seqNum: InternalKeySeqNumMax,
}
td.MaybeScanArgs(t, "seq", &snap.seqNum)
iter, _ := snap.NewIter(nil)
return runIterCmd(td, iter, true)
default:
return fmt.Sprintf("unknown command: %s", td.Cmd)
}
})
}
type iterSeekOptWrapper struct {
internalIterator
seekGEUsingNext, seekPrefixGEUsingNext *int
}
func (i *iterSeekOptWrapper) SeekGE(
key []byte, flags base.SeekGEFlags,
) (*InternalKey, base.LazyValue) {
if flags.TrySeekUsingNext() {
*i.seekGEUsingNext++
}
return i.internalIterator.SeekGE(key, flags)
}
func (i *iterSeekOptWrapper) SeekPrefixGE(
prefix, key []byte, flags base.SeekGEFlags,
) (*InternalKey, base.LazyValue) {
if flags.TrySeekUsingNext() {
*i.seekPrefixGEUsingNext++
}
return i.internalIterator.SeekPrefixGE(prefix, key, flags)
}
func TestIteratorSeekOpt(t *testing.T) {
var d *DB
defer func() {
require.NoError(t, d.Close())
}()
var iter *Iterator
defer func() {
if iter != nil {
require.NoError(t, iter.Close())
}
}()
var seekGEUsingNext, seekPrefixGEUsingNext int
datadriven.RunTest(t, "testdata/iterator_seek_opt", func(t *testing.T, td *datadriven.TestData) string {
switch td.Cmd {
case "define":
if iter != nil {
if err := iter.Close(); err != nil {
return err.Error()
}
}
if d != nil {
if err := d.Close(); err != nil {
return err.Error()
}
}
seekGEUsingNext = 0
seekPrefixGEUsingNext = 0
opts := &Options{}
opts.TablePropertyCollectors = append(opts.TablePropertyCollectors,
func() TablePropertyCollector {
return &minSeqNumPropertyCollector{}
})
var err error
if d, err = runDBDefineCmd(td, opts); err != nil {
return err.Error()
}
d.mu.Lock()
s := d.mu.versions.currentVersion().String()
d.mu.Unlock()
oldNewIters := d.newIters
d.newIters = func(
ctx context.Context, file *manifest.FileMetadata, opts *IterOptions,
internalOpts internalIterOpts) (internalIterator, keyspan.FragmentIterator, error) {
iter, rangeIter, err := oldNewIters(ctx, file, opts, internalOpts)
iterWrapped := &iterSeekOptWrapper{
internalIterator: iter,
seekGEUsingNext: &seekGEUsingNext,
seekPrefixGEUsingNext: &seekPrefixGEUsingNext,
}
return iterWrapped, rangeIter, err
}
return s
case "iter":
if iter == nil || iter.iter == nil {
// TODO(peter): runDBDefineCmd doesn't properly update the visible
// sequence number. So we have to use a snapshot with a very large
// sequence number, otherwise the DB appears empty.
snap := Snapshot{
db: d,
seqNum: InternalKeySeqNumMax,
}
iter, _ = snap.NewIter(nil)
iter.readSampling.forceReadSampling = true
iter.comparer.Split = func(a []byte) int { return len(a) }
iter.forceEnableSeekOpt = true
iter.merging.forceEnableSeekOpt = true
}
iterOutput := runIterCmd(td, iter, false)
stats := iter.Stats()
// InternalStats are non-deterministic since they depend on how data is
// distributed across memtables and sstables in the DB.
stats.InternalStats = InternalIteratorStats{}
var builder strings.Builder
fmt.Fprintf(&builder, "%sstats: %s\n", iterOutput, stats.String())
fmt.Fprintf(&builder, "SeekGEs with trySeekUsingNext: %d\n", seekGEUsingNext)
fmt.Fprintf(&builder, "SeekPrefixGEs with trySeekUsingNext: %d\n", seekPrefixGEUsingNext)
return builder.String()
default:
return fmt.Sprintf("unknown command: %s", td.Cmd)
}
})
}
type errorSeekIter struct {
internalIterator
// Fields controlling error injection for seeks.
injectSeekErrorCounts []int
seekCount int
err error
}
func (i *errorSeekIter) SeekGE(key []byte, flags base.SeekGEFlags) (*InternalKey, base.LazyValue) {
if i.tryInjectError() {
return nil, base.LazyValue{}
}
i.err = nil
i.seekCount++
return i.internalIterator.SeekGE(key, flags)
}
func (i *errorSeekIter) SeekPrefixGE(
prefix, key []byte, flags base.SeekGEFlags,
) (*InternalKey, base.LazyValue) {
if i.tryInjectError() {
return nil, base.LazyValue{}
}
i.err = nil
i.seekCount++
return i.internalIterator.SeekPrefixGE(prefix, key, flags)
}
func (i *errorSeekIter) SeekLT(key []byte, flags base.SeekLTFlags) (*InternalKey, base.LazyValue) {
if i.tryInjectError() {
return nil, base.LazyValue{}
}
i.err = nil
i.seekCount++
return i.internalIterator.SeekLT(key, flags)
}
func (i *errorSeekIter) tryInjectError() bool {
if len(i.injectSeekErrorCounts) > 0 && i.injectSeekErrorCounts[0] == i.seekCount {
i.seekCount++
i.err = errors.Errorf("injecting error")
i.injectSeekErrorCounts = i.injectSeekErrorCounts[1:]
return true
}
return false
}
func (i *errorSeekIter) First() (*InternalKey, base.LazyValue) {
i.err = nil
return i.internalIterator.First()
}
func (i *errorSeekIter) Last() (*InternalKey, base.LazyValue) {
i.err = nil
return i.internalIterator.Last()
}
func (i *errorSeekIter) Next() (*InternalKey, base.LazyValue) {
if i.err != nil {
return nil, base.LazyValue{}
}
return i.internalIterator.Next()
}
func (i *errorSeekIter) Prev() (*InternalKey, base.LazyValue) {
if i.err != nil {
return nil, base.LazyValue{}
}
return i.internalIterator.Prev()
}
func (i *errorSeekIter) Error() error {
if i.err != nil {
return i.err
}
return i.internalIterator.Error()
}
func TestIteratorSeekOptErrors(t *testing.T) {
var keys []InternalKey
var vals [][]byte
var errorIter errorSeekIter
newIter := func(opts IterOptions) *Iterator {
iter := &fakeIter{
lower: opts.GetLowerBound(),
upper: opts.GetUpperBound(),
keys: keys,
vals: vals,
}
errorIter = errorSeekIter{internalIterator: invalidating.NewIter(iter)}
// NB: This Iterator cannot be cloned since it is not constructed
// with a readState. It suffices for this test.
return &Iterator{
opts: opts,
comparer: *testkeys.Comparer,
merge: DefaultMerger.Merge,
iter: &errorIter,
}
}
datadriven.RunTest(t, "testdata/iterator_seek_opt_errors", func(t *testing.T, d *datadriven.TestData) string {
switch d.Cmd {
case "define":
keys = keys[:0]
vals = vals[:0]
for _, key := range strings.Split(d.Input, "\n") {
j := strings.Index(key, ":")
keys = append(keys, base.ParseInternalKey(key[:j]))
vals = append(vals, []byte(key[j+1:]))
}
return ""
case "iter":
var opts IterOptions
var injectSeekGEErrorCounts []int
for _, arg := range d.CmdArgs {
if len(arg.Vals) < 1 {
return fmt.Sprintf("%s: %s=<value>", d.Cmd, arg.Key)
}
switch arg.Key {
case "lower":
opts.LowerBound = []byte(arg.Vals[0])
case "upper":
opts.UpperBound = []byte(arg.Vals[0])
case "seek-error":
for i := 0; i < len(arg.Vals); i++ {
n, err := strconv.Atoi(arg.Vals[i])
if err != nil {
return err.Error()
}
injectSeekGEErrorCounts = append(injectSeekGEErrorCounts, n)
}
default:
return fmt.Sprintf("%s: unknown arg: %s", d.Cmd, arg.Key)
}
}
iter := newIter(opts)
errorIter.injectSeekErrorCounts = injectSeekGEErrorCounts
return runIterCmd(d, iter, true)
default:
return fmt.Sprintf("unknown command: %s", d.Cmd)
}
})
}
type testBlockIntervalCollector struct {
numLength int
offsetFromEnd int
initialized bool
lower, upper uint64
}
func (bi *testBlockIntervalCollector) Add(key InternalKey, value []byte) error {
k := key.UserKey
if len(k) < bi.numLength+bi.offsetFromEnd {
return nil
}
n := len(k) - bi.offsetFromEnd - bi.numLength
val, err := strconv.Atoi(string(k[n : n+bi.numLength]))
if err != nil {
return err
}
if val < 0 {
panic("testBlockIntervalCollector expects values >= 0")
}
uval := uint64(val)
if !bi.initialized {
bi.lower, bi.upper = uval, uval+1
bi.initialized = true
return nil
}
if bi.lower > uval {
bi.lower = uval
}
if uval >= bi.upper {
bi.upper = uval + 1
}
return nil
}
func (bi *testBlockIntervalCollector) FinishDataBlock() (lower uint64, upper uint64, err error) {
bi.initialized = false
l, u := bi.lower, bi.upper
bi.lower, bi.upper = 0, 0
return l, u, nil
}
func TestIteratorBlockIntervalFilter(t *testing.T) {
var mem vfs.FS
var d *DB
defer func() {
require.NoError(t, d.Close())
}()
type collector struct {
id uint16
offset int
}
createDB := func(collectors []collector) {
if d != nil {
require.NoError(t, d.Close())
}
mem = vfs.NewMem()
require.NoError(t, mem.MkdirAll("ext", 0755))
var bpCollectors []func() BlockPropertyCollector
for _, c := range collectors {
coll := c
bpCollectors = append(bpCollectors, func() BlockPropertyCollector {
return sstable.NewBlockIntervalCollector(
fmt.Sprintf("%d", coll.id),
&testBlockIntervalCollector{numLength: 2, offsetFromEnd: coll.offset},
nil, /* range key collector */
)
})
}
opts := &Options{
FS: mem,
FormatMajorVersion: internalFormatNewest,
BlockPropertyCollectors: bpCollectors,
}
lo := LevelOptions{BlockSize: 1, IndexBlockSize: 1}
opts.Levels = append(opts.Levels, lo)
// Automatic compactions may compact away tombstones from L6, making
// some testcases non-deterministic.
opts.DisableAutomaticCompactions = true
var err error
d, err = Open("", opts)
require.NoError(t, err)
}
datadriven.RunTest(
t, "testdata/iterator_block_interval_filter", func(t *testing.T, td *datadriven.TestData) string {
switch td.Cmd {
case "build":
var collectors []collector
for _, arg := range td.CmdArgs {
switch arg.Key {
case "id_offset":
if len(arg.Vals) != 2 {
return "id and offset not provided"
}
var id, offset int
var err error
if id, err = strconv.Atoi(arg.Vals[0]); err != nil {
return err.Error()
}
if offset, err = strconv.Atoi(arg.Vals[1]); err != nil {
return err.Error()
}
collectors = append(collectors, collector{id: uint16(id), offset: offset})
default:
return fmt.Sprintf("unknown key: %s", arg.Key)
}
}
createDB(collectors)
b := d.NewBatch()
if err := runBatchDefineCmd(td, b); err != nil {
return err.Error()
}
if err := b.Commit(nil); err != nil {
return err.Error()
}
if err := d.Flush(); err != nil {
return err.Error()
}
return runLSMCmd(td, d)
case "iter":
var opts IterOptions
for _, arg := range td.CmdArgs {
switch arg.Key {
case "id_lower_upper":
if len(arg.Vals) != 3 {
return "id, lower, upper not provided"
}
var id, lower, upper int
var err error
if id, err = strconv.Atoi(arg.Vals[0]); err != nil {
return err.Error()
}
if lower, err = strconv.Atoi(arg.Vals[1]); err != nil {
return err.Error()
}
if upper, err = strconv.Atoi(arg.Vals[2]); err != nil {
return err.Error()
}
opts.PointKeyFilters = append(opts.PointKeyFilters,
sstable.NewBlockIntervalFilter(fmt.Sprintf("%d", id),
uint64(lower), uint64(upper)))
default:
return fmt.Sprintf("unknown key: %s", arg.Key)
}
}
rand.Shuffle(len(opts.PointKeyFilters), func(i, j int) {
opts.PointKeyFilters[i], opts.PointKeyFilters[j] =
opts.PointKeyFilters[j], opts.PointKeyFilters[i]
})
iter, _ := d.NewIter(&opts)
return runIterCmd(td, iter, true)
default:
return fmt.Sprintf("unknown command: %s", td.Cmd)
}
})
}
var seed = flag.Uint64("seed", 0, "a pseudorandom number generator seed")
func randStr(fill []byte, rng *rand.Rand) {
const letters = "abcdefghijklmnopqrstuvwxyz"
const lettersLen = len(letters)
for i := 0; i < len(fill); i++ {
fill[i] = letters[rng.Intn(lettersLen)]
}
}
func randValue(n int, rng *rand.Rand) []byte {
buf := make([]byte, n)
randStr(buf, rng)
return buf
}
func randKey(n int, rng *rand.Rand) ([]byte, int) {
keyPrefix := randValue(n, rng)
suffix := rng.Intn(100)
return append(keyPrefix, []byte(fmt.Sprintf("%02d", suffix))...), suffix
}
func TestIteratorRandomizedBlockIntervalFilter(t *testing.T) {
mem := vfs.NewMem()
opts := &Options{
FS: mem,
FormatMajorVersion: internalFormatNewest,
BlockPropertyCollectors: []func() BlockPropertyCollector{
func() BlockPropertyCollector {
return sstable.NewBlockIntervalCollector(
"0", &testBlockIntervalCollector{numLength: 2}, nil, /* range key collector */
)
},
},
}
seed := *seed
if seed == 0 {
seed = uint64(time.Now().UnixNano())
t.Logf("seed: %d", seed)
}
rng := rand.New(rand.NewSource(seed))
opts.FlushSplitBytes = 1 << rng.Intn(8) // 1B - 256B
opts.L0CompactionThreshold = 1 << rng.Intn(2) // 1-2
opts.L0CompactionFileThreshold = 1 << rng.Intn(11) // 1-1024
opts.LBaseMaxBytes = 1 << rng.Intn(11) // 1B - 1KB
opts.MemTableSize = 2 << 10 // 2KB
var lopts LevelOptions
lopts.BlockSize = 1 << rng.Intn(8) // 1B - 256B
lopts.IndexBlockSize = 1 << rng.Intn(8) // 1B - 256B
opts.Levels = []LevelOptions{lopts}
d, err := Open("", opts)
require.NoError(t, err)
defer func() {
require.NoError(t, d.Close())
}()
matchingKeyValues := make(map[string]string)
lower := rng.Intn(100)
upper := rng.Intn(100)
if lower > upper {
lower, upper = upper, lower
}
n := 2000
for i := 0; i < n; i++ {
key, suffix := randKey(20+rng.Intn(5), rng)
value := randValue(50, rng)
if lower <= suffix && suffix < upper {
matchingKeyValues[string(key)] = string(value)
}
d.Set(key, value, nil)
}
var iterOpts IterOptions
iterOpts.PointKeyFilters = []BlockPropertyFilter{
sstable.NewBlockIntervalFilter("0",
uint64(lower), uint64(upper)),
}
iter, _ := d.NewIter(&iterOpts)
defer func() {
require.NoError(t, iter.Close())
}()
iter.First()
found := 0
matchingCount := len(matchingKeyValues)
for ; iter.Valid(); iter.Next() {
found++
key := string(iter.Key())
value, ok := matchingKeyValues[key]
if ok {
require.Equal(t, value, string(iter.Value()))
delete(matchingKeyValues, key)
}
}
t.Logf("generated %d keys: %d matching, %d found", n, matchingCount, found)
require.Equal(t, 0, len(matchingKeyValues))
}
func TestIteratorGuaranteedDurable(t *testing.T) {
mem := vfs.NewMem()
opts := &Options{FS: mem}
d, err := Open("", opts)
require.NoError(t, err)
defer func() {
require.NoError(t, d.Close())
}()
iterOptions := IterOptions{OnlyReadGuaranteedDurable: true}
failFunc := func(t *testing.T, reader Reader) {
defer func() {
if r := recover(); r == nil {
require.Fail(t, "expected panic")
}
reader.Close()
}()
iter, _ := reader.NewIter(&iterOptions)
defer iter.Close()
}
t.Run("snapshot", func(t *testing.T) {
failFunc(t, d.NewSnapshot())
})
t.Run("batch", func(t *testing.T) {
failFunc(t, d.NewIndexedBatch())
})
t.Run("db", func(t *testing.T) {
d.Set([]byte("k"), []byte("v"), nil)
foundKV := func(o *IterOptions) bool {
iter, _ := d.NewIter(o)
defer iter.Close()
iter.SeekGE([]byte("k"))
return iter.Valid()
}
require.True(t, foundKV(nil))
require.False(t, foundKV(&iterOptions))
require.NoError(t, d.Flush())
require.True(t, foundKV(nil))
require.True(t, foundKV(&iterOptions))
})
}
func TestIteratorBoundsLifetimes(t *testing.T) {
rng := rand.New(rand.NewSource(uint64(time.Now().UnixNano())))
d := newPointTestkeysDatabase(t, testkeys.Alpha(2))
defer func() { require.NoError(t, d.Close()) }()
var buf bytes.Buffer
iterators := map[string]*Iterator{}
var labels []string
printIters := func(w io.Writer) {
labels = labels[:0]
for label := range iterators {
labels = append(labels, label)
}
sort.Strings(labels)
for _, label := range labels {
it := iterators[label]
fmt.Fprintf(&buf, "%s: (", label)
if it.opts.LowerBound == nil {
fmt.Fprint(&buf, "<nil>, ")
} else {
fmt.Fprintf(&buf, "%q, ", it.opts.LowerBound)
}
if it.opts.UpperBound == nil {
fmt.Fprint(&buf, "<nil>)")
} else {
fmt.Fprintf(&buf, "%q)", it.opts.UpperBound)
}
fmt.Fprintf(&buf, " boundsBufIdx=%d\n", it.boundsBufIdx)
}
}
parseBounds := func(td *datadriven.TestData) (lower, upper []byte) {
for _, arg := range td.CmdArgs {
if arg.Key == "lower" {
lower = []byte(arg.Vals[0])
} else if arg.Key == "upper" {
upper = []byte(arg.Vals[0])
}
}
return lower, upper
}
trashBounds := func(bounds ...[]byte) {
for _, bound := range bounds {
rng.Read(bound[:])
}
}
datadriven.RunTest(t, "testdata/iterator_bounds_lifetimes", func(t *testing.T, td *datadriven.TestData) string {
switch td.Cmd {
case "define":
var err error
if d, err = runDBDefineCmd(td, d.opts); err != nil {
return err.Error()
}
d.mu.Lock()
s := d.mu.versions.currentVersion().String()
d.mu.Unlock()
return s
case "new-iter":
var label string
td.ScanArgs(t, "label", &label)
lower, upper := parseBounds(td)
iterators[label], _ = d.NewIter(&IterOptions{
LowerBound: lower,
UpperBound: upper,
})
trashBounds(lower, upper)
buf.Reset()
printIters(&buf)
return buf.String()
case "clone":
var from, to string
td.ScanArgs(t, "from", &from)
td.ScanArgs(t, "to", &to)
var err error
iterators[to], err = iterators[from].Clone(CloneOptions{})
if err != nil {
return err.Error()
}
buf.Reset()
printIters(&buf)
return buf.String()
case "close":
var label string
td.ScanArgs(t, "label", &label)
iterators[label].Close()
delete(iterators, label)
buf.Reset()
printIters(&buf)
return buf.String()
case "iter":
var label string
td.ScanArgs(t, "label", &label)
return runIterCmd(td, iterators[label], false /* closeIter */)
case "set-bounds":
var label string
td.ScanArgs(t, "label", &label)
lower, upper := parseBounds(td)
iterators[label].SetBounds(lower, upper)
trashBounds(lower, upper)
buf.Reset()
printIters(&buf)
return buf.String()
case "set-options":
var label string
var tableFilter bool
td.ScanArgs(t, "label", &label)
opts := iterators[label].opts
for _, arg := range td.CmdArgs {
if arg.Key == "table-filter" {
tableFilter = true
}
if arg.Key == "key-types" {
switch arg.Vals[0] {
case "points-only":
opts.KeyTypes = IterKeyTypePointsOnly
case "ranges-only":
opts.KeyTypes = IterKeyTypeRangesOnly
case "both":
opts.KeyTypes = IterKeyTypePointsAndRanges
default:
panic(fmt.Sprintf("unrecognized key type %q", arg.Vals[0]))
}
}
}
opts.LowerBound, opts.UpperBound = parseBounds(td)
if tableFilter {
opts.TableFilter = func(userProps map[string]string) bool { return false }
}
iterators[label].SetOptions(&opts)
trashBounds(opts.LowerBound, opts.UpperBound)
buf.Reset()
printIters(&buf)
return buf.String()
default:
return fmt.Sprintf("unrecognized command %q", td.Cmd)
}
})
}
func TestIteratorStatsMerge(t *testing.T) {
s := IteratorStats{
ForwardSeekCount: [NumStatsKind]int{1, 2},
ReverseSeekCount: [NumStatsKind]int{3, 4},
ForwardStepCount: [NumStatsKind]int{5, 6},
ReverseStepCount: [NumStatsKind]int{7, 8},
InternalStats: InternalIteratorStats{
BlockBytes: 9,
BlockBytesInCache: 10,
BlockReadDuration: 3 * time.Millisecond,
KeyBytes: 11,
ValueBytes: 12,
PointCount: 13,
PointsCoveredByRangeTombstones: 14,
},
RangeKeyStats: RangeKeyIteratorStats{
Count: 15,
ContainedPoints: 16,
SkippedPoints: 17,
},
}
s.InternalStats.SeparatedPointValue.Count = 1
s.InternalStats.SeparatedPointValue.ValueBytes = 5
s.InternalStats.SeparatedPointValue.ValueBytesFetched = 3
s2 := IteratorStats{
ForwardSeekCount: [NumStatsKind]int{1, 2},
ReverseSeekCount: [NumStatsKind]int{3, 4},
ForwardStepCount: [NumStatsKind]int{5, 6},
ReverseStepCount: [NumStatsKind]int{7, 8},
InternalStats: InternalIteratorStats{
BlockBytes: 9,
BlockBytesInCache: 10,
BlockReadDuration: 4 * time.Millisecond,
KeyBytes: 11,
ValueBytes: 12,
PointCount: 13,
PointsCoveredByRangeTombstones: 14,
},
RangeKeyStats: RangeKeyIteratorStats{
Count: 15,
ContainedPoints: 16,
SkippedPoints: 17,
},
}
s2.InternalStats.SeparatedPointValue.Count = 2
s2.InternalStats.SeparatedPointValue.ValueBytes = 10
s2.InternalStats.SeparatedPointValue.ValueBytesFetched = 6
s.Merge(s2)
expected := IteratorStats{
ForwardSeekCount: [NumStatsKind]int{2, 4},
ReverseSeekCount: [NumStatsKind]int{6, 8},
ForwardStepCount: [NumStatsKind]int{10, 12},
ReverseStepCount: [NumStatsKind]int{14, 16},
InternalStats: InternalIteratorStats{
BlockBytes: 18,
BlockBytesInCache: 20,
BlockReadDuration: 7 * time.Millisecond,
KeyBytes: 22,
ValueBytes: 24,
PointCount: 26,
PointsCoveredByRangeTombstones: 28,
},
RangeKeyStats: RangeKeyIteratorStats{
Count: 30,
ContainedPoints: 32,
SkippedPoints: 34,
},
}
expected.InternalStats.SeparatedPointValue.Count = 3
expected.InternalStats.SeparatedPointValue.ValueBytes = 15
expected.InternalStats.SeparatedPointValue.ValueBytesFetched = 9
require.Equal(t, expected, s)
}
// TestSetOptionsEquivalence tests equivalence between SetOptions to mutate an
// iterator and constructing a new iterator with NewIter. The long-lived
// iterator and the new iterator should surface identical iterator states.
func TestSetOptionsEquivalence(t *testing.T) {
seed := uint64(time.Now().UnixNano())
// Call a helper function with the seed so that the seed appears within
// stack traces if there's a panic.
testSetOptionsEquivalence(t, seed)
}
func testSetOptionsEquivalence(t *testing.T, seed uint64) {
rng := rand.New(rand.NewSource(seed))
ks := testkeys.Alpha(2)
d := newTestkeysDatabase(t, ks, rng)
defer func() { require.NoError(t, d.Close()) }()
var o IterOptions
generateNewOptions := func() {
// TODO(jackson): Include test coverage for block property filters, etc.
if rng.Intn(2) == 1 {
o.KeyTypes = IterKeyType(rng.Intn(3))
}
if rng.Intn(2) == 1 {
if rng.Intn(2) == 1 {
o.LowerBound = nil
if rng.Intn(2) == 1 {
o.LowerBound = testkeys.KeyAt(ks, rng.Int63n(ks.Count()), rng.Int63n(ks.Count()))
}
}
if rng.Intn(2) == 1 {
o.UpperBound = nil
if rng.Intn(2) == 1 {
o.UpperBound = testkeys.KeyAt(ks, rng.Int63n(ks.Count()), rng.Int63n(ks.Count()))
}
}
if testkeys.Comparer.Compare(o.LowerBound, o.UpperBound) > 0 {
o.LowerBound, o.UpperBound = o.UpperBound, o.LowerBound
}
}
o.RangeKeyMasking.Suffix = nil
if o.KeyTypes == IterKeyTypePointsAndRanges && rng.Intn(2) == 1 {
o.RangeKeyMasking.Suffix = testkeys.Suffix(rng.Int63n(ks.Count()))
}
}
var longLivedIter, newIter *Iterator
var history, longLivedBuf, newIterBuf bytes.Buffer
defer func() {
if r := recover(); r != nil {
t.Log(history.String())
panic(r)
}
}()
defer func() {
if longLivedIter != nil {
longLivedIter.Close()
}
if newIter != nil {
newIter.Close()
}
}()
type positioningOp struct {
desc string
run func(*Iterator) IterValidityState
}
positioningOps := []func() positioningOp{
// SeekGE
func() positioningOp {
k := testkeys.Key(ks, rng.Int63n(ks.Count()))
return positioningOp{
desc: fmt.Sprintf("SeekGE(%q)", k),
run: func(it *Iterator) IterValidityState {
return it.SeekGEWithLimit(k, nil)
},
}
},
// SeekLT
func() positioningOp {
k := testkeys.Key(ks, rng.Int63n(ks.Count()))
return positioningOp{
desc: fmt.Sprintf("SeekLT(%q)", k),
run: func(it *Iterator) IterValidityState {
return it.SeekLTWithLimit(k, nil)
},
}
},
// SeekPrefixGE
func() positioningOp {
k := testkeys.Key(ks, rng.Int63n(ks.Count()))
return positioningOp{
desc: fmt.Sprintf("SeekPrefixGE(%q)", k),
run: func(it *Iterator) IterValidityState {
if it.SeekPrefixGE(k) {
return IterValid
}
return IterExhausted
},
}
},
}
for i := 0; i < 10_000; i++ {
// Generate new random options. The options in o will be mutated.
generateNewOptions()
fmt.Fprintf(&history, "new options: %s\n", iterOptionsString(&o))
newIter, _ = d.NewIter(&o)
if longLivedIter == nil {
longLivedIter, _ = d.NewIter(&o)
} else {
longLivedIter.SetOptions(&o)
}
// Apply the same operation to both keys.
iterOp := positioningOps[rng.Intn(len(positioningOps))]()
newIterValidity := iterOp.run(newIter)
longLivedValidity := iterOp.run(longLivedIter)
newIterBuf.Reset()
longLivedBuf.Reset()
printIterState(&newIterBuf, newIter, newIterValidity, true /* printValidityState */)
printIterState(&longLivedBuf, longLivedIter, longLivedValidity, true /* printValidityState */)
fmt.Fprintf(&history, "%s = %s\n", iterOp.desc, newIterBuf.String())
if newIterBuf.String() != longLivedBuf.String() {
t.Logf("history:\n%s\n", history.String())
t.Logf("seed: %d\n", seed)
t.Fatalf("expected %q, got %q", newIterBuf.String(), longLivedBuf.String())
}
_ = newIter.Close()
newIter = nil
}
t.Logf("history:\n%s\n", history.String())
}
func iterOptionsString(o *IterOptions) string {
var buf bytes.Buffer
fmt.Fprintf(&buf, "key-types=%s, lower=%q, upper=%q",
o.KeyTypes, o.LowerBound, o.UpperBound)
if o.TableFilter != nil {
fmt.Fprintf(&buf, ", table-filter")
}
if o.OnlyReadGuaranteedDurable {
fmt.Fprintf(&buf, ", only-durable")
}
if o.UseL6Filters {
fmt.Fprintf(&buf, ", use-L6-filters")
}
for i, pkf := range o.PointKeyFilters {
fmt.Fprintf(&buf, ", point-key-filter[%d]=%q", i, pkf.Name())
}
for i, rkf := range o.RangeKeyFilters {
fmt.Fprintf(&buf, ", range-key-filter[%d]=%q", i, rkf.Name())
}
return buf.String()
}
func newTestkeysDatabase(t *testing.T, ks testkeys.Keyspace, rng *rand.Rand) *DB {
dbOpts := &Options{
Comparer: testkeys.Comparer,
FS: vfs.NewMem(),
FormatMajorVersion: FormatRangeKeys,
Logger: panicLogger{},
}
d, err := Open("", dbOpts)
require.NoError(t, err)
// Randomize the order in which we write keys.
order := rng.Perm(int(ks.Count()))
b := d.NewBatch()
keyBuf := make([]byte, ks.MaxLen()+testkeys.MaxSuffixLen)
keyBuf2 := make([]byte, ks.MaxLen()+testkeys.MaxSuffixLen)
for i := 0; i < len(order); i++ {
const maxVersionsPerKey = 10
keyIndex := order[i]
for versions := rng.Intn(maxVersionsPerKey); versions > 0; versions-- {
n := testkeys.WriteKeyAt(keyBuf, ks, int64(keyIndex), rng.Int63n(maxVersionsPerKey))
b.Set(keyBuf[:n], keyBuf[:n], nil)
}
// Sometimes add a range key too.
if rng.Intn(100) == 1 {
startIdx := rng.Int63n(ks.Count())
endIdx := rng.Int63n(ks.Count())
startLen := testkeys.WriteKey(keyBuf, ks, startIdx)
endLen := testkeys.WriteKey(keyBuf2, ks, endIdx)
suffixInt := rng.Int63n(maxVersionsPerKey)
require.NoError(t, b.RangeKeySet(
keyBuf[:startLen],
keyBuf2[:endLen],
testkeys.Suffix(suffixInt),
nil,
nil))
}
// Randomize the flush points.
if !b.Empty() && rng.Intn(10) == 1 {
require.NoError(t, b.Commit(nil))
require.NoError(t, d.Flush())
b = d.NewBatch()
}
}
if !b.Empty() {
require.NoError(t, b.Commit(nil))
}
return d
}
func newPointTestkeysDatabase(t *testing.T, ks testkeys.Keyspace) *DB {
dbOpts := &Options{
Comparer: testkeys.Comparer,
FS: vfs.NewMem(),
FormatMajorVersion: FormatRangeKeys,
}
d, err := Open("", dbOpts)
require.NoError(t, err)
b := d.NewBatch()
keyBuf := make([]byte, ks.MaxLen()+testkeys.MaxSuffixLen)
for i := int64(0); i < ks.Count(); i++ {
n := testkeys.WriteKeyAt(keyBuf, ks, i, i)
b.Set(keyBuf[:n], keyBuf[:n], nil)
}
require.NoError(t, b.Commit(nil))
return d
}
func BenchmarkIteratorSeekGE(b *testing.B) {
m, keys := buildMemTable(b)
iter := &Iterator{
comparer: *DefaultComparer,
iter: m.newIter(nil),
}
rng := rand.New(rand.NewSource(uint64(time.Now().UnixNano())))
b.ResetTimer()
for i := 0; i < b.N; i++ {
key := keys[rng.Intn(len(keys))]
iter.SeekGE(key)
}
}
func BenchmarkIteratorNext(b *testing.B) {
m, _ := buildMemTable(b)
iter := &Iterator{
comparer: *DefaultComparer,
iter: m.newIter(nil),
}
b.ResetTimer()
for i := 0; i < b.N; i++ {
if !iter.Valid() {
iter.First()
}
iter.Next()
}
}
func BenchmarkIteratorPrev(b *testing.B) {
m, _ := buildMemTable(b)
iter := &Iterator{
comparer: *DefaultComparer,
iter: m.newIter(nil),
}
b.ResetTimer()
for i := 0; i < b.N; i++ {
if !iter.Valid() {
iter.Last()
}
iter.Prev()
}
}
type twoLevelBloomTombstoneState struct {
keys [][]byte
readers [8][][]*sstable.Reader
levelSlices [8][]manifest.LevelSlice
indexFunc func(twoLevelIndex bool, bloom bool, withTombstone bool) int
}
func setupForTwoLevelBloomTombstone(b *testing.B, keyOffset int) twoLevelBloomTombstoneState {
const blockSize = 32 << 10
const restartInterval = 16
const levelCount = 5
var readers [8][][]*sstable.Reader
var levelSlices [8][]manifest.LevelSlice
var keys [][]byte
indexFunc := func(twoLevelIndex bool, bloom bool, withTombstone bool) int {
index := 0
if twoLevelIndex {
index = 4
}
if bloom {
index += 2
}
if withTombstone {
index++
}
return index
}
for _, twoLevelIndex := range []bool{false, true} {
for _, bloom := range []bool{false, true} {
for _, withTombstone := range []bool{false, true} {
index := indexFunc(twoLevelIndex, bloom, withTombstone)
levels := levelCount
if withTombstone {
levels = 1
}
readers[index], levelSlices[index], keys = buildLevelsForMergingIterSeqSeek(
b, blockSize, restartInterval, levels, keyOffset, withTombstone, bloom, twoLevelIndex)
}
}
}
return twoLevelBloomTombstoneState{
keys: keys, readers: readers, levelSlices: levelSlices, indexFunc: indexFunc}
}
// BenchmarkIteratorSeqSeekPrefixGENotFound exercises the case of SeekPrefixGE
// specifying monotonic keys all of which precede actual keys present in L6 of
// the DB. Moreover, with-tombstone=true exercises the sub-case where those
// actual keys are deleted using a range tombstone that has not physically
// deleted those keys due to the presence of a snapshot that needs to see
// those keys. This sub-case needs to be efficient in (a) avoiding iteration
// over all those deleted keys, including repeated iteration, (b) using the
// next optimization, since the seeks are monotonic.
func BenchmarkIteratorSeqSeekPrefixGENotFound(b *testing.B) {
const keyOffset = 100000
state := setupForTwoLevelBloomTombstone(b, keyOffset)
readers := state.readers
levelSlices := state.levelSlices
indexFunc := state.indexFunc
// We will not be seeking to the keys that were written but instead to
// keys before the written keys. This is to validate that the optimization
// to use Next still functions when mergingIter checks for the prefix
// match, and that mergingIter can avoid iterating over all the keys
// deleted by a range tombstone when there is no possibility of matching
// the prefix.
var keys [][]byte
for i := 0; i < keyOffset; i++ {
keys = append(keys, []byte(fmt.Sprintf("%08d", i)))
}
for _, skip := range []int{1, 2, 4} {
for _, twoLevelIndex := range []bool{false, true} {
for _, bloom := range []bool{false, true} {
for _, withTombstone := range []bool{false, true} {
b.Run(fmt.Sprintf("skip=%d/two-level=%t/bloom=%t/with-tombstone=%t",
skip, twoLevelIndex, bloom, withTombstone),
func(b *testing.B) {
index := indexFunc(twoLevelIndex, bloom, withTombstone)
readers := readers[index]
levelSlices := levelSlices[index]
m := buildMergingIter(readers, levelSlices)
iter := Iterator{
comparer: *testkeys.Comparer,
merge: DefaultMerger.Merge,
iter: m,
}
pos := 0
b.ResetTimer()
for i := 0; i < b.N; i++ {
// When withTombstone=true, and prior to the
// optimization to stop early due to a range
// tombstone, the iteration would continue into the
// next file, and not be able to use Next at the lower
// level in the next SeekPrefixGE call. So we would
// incur the cost of iterating over all the deleted
// keys for every seek. Note that it is not possible
// to do a noop optimization in Iterator for the
// prefix case, unlike SeekGE/SeekLT, since we don't
// know if the iterators inside mergingIter are all
// appropriately positioned -- some may not be due to
// bloom filters not matching.
valid := iter.SeekPrefixGE(keys[pos])
if valid {
b.Fatalf("key should not be found")
}
pos += skip
if pos >= keyOffset {
pos = 0
}
}
b.StopTimer()
iter.Close()
})
}
}
}
}
for _, r := range readers {
for i := range r {
for j := range r[i] {
r[i][j].Close()
}
}
}
}
// BenchmarkIteratorSeqSeekPrefixGEFound exercises the case of SeekPrefixGE
// specifying monotonic keys that are present in L6 of the DB. Moreover,
// with-tombstone=true exercises the sub-case where those actual keys are
// deleted using a range tombstone that has not physically deleted those keys
// due to the presence of a snapshot that needs to see those keys. This
// sub-case needs to be efficient in (a) avoiding iteration over all those
// deleted keys, including repeated iteration, (b) using the next
// optimization, since the seeks are monotonic.
func BenchmarkIteratorSeqSeekPrefixGEFound(b *testing.B) {
state := setupForTwoLevelBloomTombstone(b, 0)
keys := state.keys
readers := state.readers
levelSlices := state.levelSlices
indexFunc := state.indexFunc
for _, skip := range []int{1, 2, 4} {
for _, twoLevelIndex := range []bool{false, true} {
for _, bloom := range []bool{false, true} {
for _, withTombstone := range []bool{false, true} {
b.Run(fmt.Sprintf("skip=%d/two-level=%t/bloom=%t/with-tombstone=%t",
skip, twoLevelIndex, bloom, withTombstone),
func(b *testing.B) {
index := indexFunc(twoLevelIndex, bloom, withTombstone)
readers := readers[index]
levelSlices := levelSlices[index]
m := buildMergingIter(readers, levelSlices)
iter := Iterator{
comparer: *testkeys.Comparer,
merge: DefaultMerger.Merge,
iter: m,
}
pos := 0
b.ResetTimer()
for i := 0; i < b.N; i++ {
// When withTombstone=true, and prior to the
// optimization to stop early due to a range
// tombstone, the iteration would continue into the
// next file, and not be able to use Next at the lower
// level in the next SeekPrefixGE call. So we would
// incur the cost of iterating over all the deleted
// keys for every seek. Note that it is not possible
// to do a noop optimization in Iterator for the
// prefix case, unlike SeekGE/SeekLT, since we don't
// know if the iterators inside mergingIter are all
// appropriately positioned -- some may not be due to
// bloom filters not matching.
_ = iter.SeekPrefixGE(keys[pos])
pos += skip
if pos >= len(keys) {
pos = 0
}
}
b.StopTimer()
iter.Close()
})
}
}
}
}
for _, r := range readers {
for i := range r {
for j := range r[i] {
r[i][j].Close()
}
}
}
}
// BenchmarkIteratorSeqSeekGEWithBounds is analogous to
// BenchmarkMergingIterSeqSeekGEWithBounds, except for using an Iterator,
// which causes it to exercise the end-to-end code path.
func BenchmarkIteratorSeqSeekGEWithBounds(b *testing.B) {
const blockSize = 32 << 10
const restartInterval = 16
const levelCount = 5
for _, twoLevelIndex := range []bool{false, true} {
b.Run(fmt.Sprintf("two-level=%t", twoLevelIndex),
func(b *testing.B) {
readers, levelSlices, keys := buildLevelsForMergingIterSeqSeek(
b, blockSize, restartInterval, levelCount, 0, /* keyOffset */
false, false, twoLevelIndex)
m := buildMergingIter(readers, levelSlices)
iter := Iterator{
comparer: *testkeys.Comparer,
merge: DefaultMerger.Merge,
iter: m,
}
keyCount := len(keys)
b.ResetTimer()
for i := 0; i < b.N; i++ {
pos := i % (keyCount - 1)
iter.SetBounds(keys[pos], keys[pos+1])
// SeekGE will return keys[pos].
valid := iter.SeekGE(keys[pos])
for valid {
valid = iter.Next()
}
if iter.Error() != nil {
b.Fatalf(iter.Error().Error())
}
}
iter.Close()
for i := range readers {
for j := range readers[i] {
readers[i][j].Close()
}
}
})
}
}
func BenchmarkIteratorSeekGENoop(b *testing.B) {
const blockSize = 32 << 10
const restartInterval = 16
const levelCount = 5
const keyOffset = 10000
readers, levelSlices, _ := buildLevelsForMergingIterSeqSeek(
b, blockSize, restartInterval, levelCount, keyOffset, false, false, false)
var keys [][]byte
for i := 0; i < keyOffset; i++ {
keys = append(keys, []byte(fmt.Sprintf("%08d", i)))
}
for _, withLimit := range []bool{false, true} {
b.Run(fmt.Sprintf("withLimit=%t", withLimit), func(b *testing.B) {
m := buildMergingIter(readers, levelSlices)
iter := Iterator{
comparer: *testkeys.Comparer,
merge: DefaultMerger.Merge,
iter: m,
}
b.ResetTimer()
for i := 0; i < b.N; i++ {
pos := i % (len(keys) - 1)
if withLimit {
if iter.SeekGEWithLimit(keys[pos], keys[pos+1]) != IterAtLimit {
b.Fatal("should be at limit")
}
} else {
if !iter.SeekGE(keys[pos]) {
b.Fatal("should be valid")
}
}
}
iter.Close()
})
}
for i := range readers {
for j := range readers[i] {
readers[i][j].Close()
}
}
}
func BenchmarkBlockPropertyFilter(b *testing.B) {
rng := rand.New(rand.NewSource(uint64(time.Now().UnixNano())))
for _, matchInterval := range []int{1, 10, 100, 1000} {
b.Run(fmt.Sprintf("match-interval=%d", matchInterval), func(b *testing.B) {
mem := vfs.NewMem()
opts := &Options{
FS: mem,
FormatMajorVersion: FormatNewest,
BlockPropertyCollectors: []func() BlockPropertyCollector{
func() BlockPropertyCollector {
return sstable.NewBlockIntervalCollector(
"0", &testBlockIntervalCollector{numLength: 3}, nil, /* range key collector */
)
},
},
}
d, err := Open("", opts)
require.NoError(b, err)
defer func() {
require.NoError(b, d.Close())
}()
batch := d.NewBatch()
const numKeys = 20 * 1000
const valueSize = 1000
for i := 0; i < numKeys; i++ {
key := fmt.Sprintf("%06d%03d", i, i%matchInterval)
value := randValue(valueSize, rng)
require.NoError(b, batch.Set([]byte(key), value, nil))
}
require.NoError(b, batch.Commit(nil))
require.NoError(b, d.Flush())
require.NoError(b, d.Compact(nil, []byte{0xFF}, false))
for _, filter := range []bool{false, true} {
b.Run(fmt.Sprintf("filter=%t", filter), func(b *testing.B) {
var iterOpts IterOptions
if filter {
iterOpts.PointKeyFilters = []BlockPropertyFilter{
sstable.NewBlockIntervalFilter("0",
uint64(0), uint64(1)),
}
}
iter, _ := d.NewIter(&iterOpts)
b.ResetTimer()
for i := 0; i < b.N; i++ {
valid := iter.First()
for valid {
valid = iter.Next()
}
}
b.StopTimer()
require.NoError(b, iter.Close())
})
}
})
}
}
func TestRangeKeyMaskingRandomized(t *testing.T) {
seed := *seed
if seed == 0 {
seed = uint64(time.Now().UnixNano())
t.Logf("seed: %d", seed)
}
rng := rand.New(rand.NewSource(seed))
// Generate keyspace with point keys, and range keys which will
// mask the point keys.
var timestamps []int64
for i := 0; i <= 100; i++ {
timestamps = append(timestamps, rng.Int63n(1000))
}
ks := testkeys.Alpha(5)
numKeys := 1000 + rng.Intn(9000)
keys := make([][]byte, numKeys)
keyTimeStamps := make([]int64, numKeys) // ts associated with the keys.
for i := 0; i < numKeys; i++ {
keys[i] = make([]byte, 5+testkeys.MaxSuffixLen)
keyTimeStamps[i] = timestamps[rng.Intn(len(timestamps))]
n := testkeys.WriteKeyAt(keys[i], ks, rng.Int63n(ks.Count()), keyTimeStamps[i])
keys[i] = keys[i][:n]
}
numRangeKeys := rng.Intn(20)
type rkey struct {
start []byte
end []byte
suffix []byte
}
rkeys := make([]rkey, numRangeKeys)
pointKeyHidden := make([]bool, numKeys)
for i := 0; i < numRangeKeys; i++ {
rkeys[i].start = make([]byte, 5)
rkeys[i].end = make([]byte, 5)
testkeys.WriteKey(rkeys[i].start[:5], ks, rng.Int63n(ks.Count()))
testkeys.WriteKey(rkeys[i].end[:5], ks, rng.Int63n(ks.Count()))
for bytes.Equal(rkeys[i].start[:5], rkeys[i].end[:5]) {
testkeys.WriteKey(rkeys[i].end[:5], ks, rng.Int63n(ks.Count()))
}
if bytes.Compare(rkeys[i].start[:5], rkeys[i].end[:5]) > 0 {
rkeys[i].start, rkeys[i].end = rkeys[i].end, rkeys[i].start
}
rkeyTimestamp := timestamps[rng.Intn(len(timestamps))]
rkeys[i].suffix = []byte("@" + strconv.FormatInt(rkeyTimestamp, 10))
// Each time we create a range key, check if the range key masks any
// point keys.
for j, pkey := range keys {
if pointKeyHidden[j] {
continue
}
if keyTimeStamps[j] >= rkeyTimestamp {
continue
}
if testkeys.Comparer.Compare(pkey, rkeys[i].start) >= 0 &&
testkeys.Comparer.Compare(pkey, rkeys[i].end) < 0 {
pointKeyHidden[j] = true
}
}
}
// Define a simple base testOpts, and a randomized testOpts. The results
// of iteration will be compared.
type testOpts struct {
levelOpts []LevelOptions
filter func() BlockPropertyFilterMask
}
baseOpts := testOpts{
levelOpts: make([]LevelOptions, 7),
}
for i := 0; i < len(baseOpts.levelOpts); i++ {
baseOpts.levelOpts[i].TargetFileSize = 1
baseOpts.levelOpts[i].BlockSize = 1
}
randomOpts := testOpts{
levelOpts: []LevelOptions{
{
TargetFileSize: int64(1 + rng.Intn(2<<20)), // Vary the L0 file size.
BlockSize: 1 + rng.Intn(32<<10),
},
},
}
if rng.Intn(2) == 0 {
randomOpts.filter = func() BlockPropertyFilterMask {
return sstable.NewTestKeysMaskingFilter()
}
}
maxProcs := runtime.GOMAXPROCS(0)
opts1 := &Options{
FS: vfs.NewStrictMem(),
Comparer: testkeys.Comparer,
FormatMajorVersion: FormatNewest,
MaxConcurrentCompactions: func() int { return maxProcs/2 + 1 },
BlockPropertyCollectors: []func() BlockPropertyCollector{
sstable.NewTestKeysBlockPropertyCollector,
},
}
opts1.Levels = baseOpts.levelOpts
d1, err := Open("", opts1)
require.NoError(t, err)
opts2 := &Options{
FS: vfs.NewStrictMem(),
Comparer: testkeys.Comparer,
FormatMajorVersion: FormatNewest,
MaxConcurrentCompactions: func() int { return maxProcs/2 + 1 },
BlockPropertyCollectors: []func() BlockPropertyCollector{
sstable.NewTestKeysBlockPropertyCollector,
},
}
opts2.Levels = randomOpts.levelOpts
d2, err := Open("", opts2)
require.NoError(t, err)
defer func() {
if err := d1.Close(); err != nil {
t.Fatal(err)
}
if err := d2.Close(); err != nil {
t.Fatal(err)
}
}()
// Run test
var batch1 *Batch
var batch2 *Batch
const keysPerBatch = 50
for i := 0; i < numKeys; i++ {
if i%keysPerBatch == 0 {
if batch1 != nil {
require.NoError(t, batch1.Commit(nil))
require.NoError(t, batch2.Commit(nil))
}
batch1 = d1.NewBatch()
batch2 = d2.NewBatch()
}
require.NoError(t, batch1.Set(keys[i], []byte{1}, nil))
require.NoError(t, batch2.Set(keys[i], []byte{1}, nil))
}
for _, rkey := range rkeys {
require.NoError(t, d1.RangeKeySet(rkey.start, rkey.end, rkey.suffix, nil, nil))
require.NoError(t, d2.RangeKeySet(rkey.start, rkey.end, rkey.suffix, nil, nil))
}
// Scan the keyspace
iter1Opts := IterOptions{
KeyTypes: IterKeyTypePointsAndRanges,
RangeKeyMasking: RangeKeyMasking{
Suffix: []byte("@1000"),
Filter: baseOpts.filter,
},
}
iter2Opts := IterOptions{
KeyTypes: IterKeyTypePointsAndRanges,
RangeKeyMasking: RangeKeyMasking{
Suffix: []byte("@1000"),
Filter: randomOpts.filter,
},
}
iter1, _ := d1.NewIter(&iter1Opts)
iter2, _ := d2.NewIter(&iter2Opts)
defer func() {
if err := iter1.Close(); err != nil {
t.Fatal(err)
}
if err := iter2.Close(); err != nil {
t.Fatal(err)
}
}()
for valid1, valid2 := iter1.First(), iter2.First(); valid1 || valid2; valid1, valid2 = iter1.Next(), iter2.Next() {
if valid1 != valid2 {
t.Fatalf("iteration didn't produce identical results")
}
// Confirm exposed range key state is identical.
hasP1, hasR1 := iter1.HasPointAndRange()
hasP2, hasR2 := iter2.HasPointAndRange()
if hasP1 != hasP2 || hasR1 != hasR2 {
t.Fatalf("iteration didn't produce identical results")
}
if hasP1 && !bytes.Equal(iter1.Key(), iter2.Key()) {
t.Fatalf(fmt.Sprintf("iteration didn't produce identical point keys: %s, %s", iter1.Key(), iter2.Key()))
}
if hasR1 {
// Confirm that the range key is the same.
b1, e1 := iter1.RangeBounds()
b2, e2 := iter2.RangeBounds()
if !bytes.Equal(b1, b2) || !bytes.Equal(e1, e2) {
t.Fatalf(fmt.Sprintf(
"iteration didn't produce identical range keys: [%s, %s], [%s, %s]",
b1, e1, b2, e2,
))
}
}
// Confirm that the returned point key wasn't hidden.
for j, pkey := range keys {
if bytes.Equal(iter1.Key(), pkey) && pointKeyHidden[j] {
t.Fatalf(fmt.Sprintf("hidden point key was exposed %s %d", pkey, keyTimeStamps[j]))
}
}
}
}
// BenchmarkIterator_RangeKeyMasking benchmarks a scan through a keyspace with
// 10,000 random suffixed point keys, and three range keys covering most of the
// keyspace. It varies the suffix of the range keys in subbenchmarks to exercise
// varying amounts of masking. This benchmark does configure a block-property
// filter, allowing for skipping blocks wholly contained within a range key and
// consisting of points all with a suffix lower than the range key's.
func BenchmarkIterator_RangeKeyMasking(b *testing.B) {
const (
prefixLen = 20
valueSize = 1024
batches = 200
keysPerBatch = 50
)
var alloc bytealloc.A
rng := rand.New(rand.NewSource(uint64(1658872515083979000)))
keyBuf := make([]byte, prefixLen+testkeys.MaxSuffixLen)
valBuf := make([]byte, valueSize)
mem := vfs.NewStrictMem()
maxProcs := runtime.GOMAXPROCS(0)
opts := &Options{
FS: mem,
Comparer: testkeys.Comparer,
FormatMajorVersion: FormatNewest,
MaxConcurrentCompactions: func() int { return maxProcs/2 + 1 },
BlockPropertyCollectors: []func() BlockPropertyCollector{
sstable.NewTestKeysBlockPropertyCollector,
},
}
d, err := Open("", opts)
require.NoError(b, err)
keys := make([][]byte, keysPerBatch*batches)
for bi := 0; bi < batches; bi++ {
batch := d.NewBatch()
for k := 0; k < keysPerBatch; k++ {
randStr(keyBuf[:prefixLen], rng)
suffix := rng.Int63n(100)
suffixLen := testkeys.WriteSuffix(keyBuf[prefixLen:], suffix)
randStr(valBuf[:], rng)
var key []byte
alloc, key = alloc.Copy(keyBuf[:prefixLen+suffixLen])
keys[bi*keysPerBatch+k] = key
require.NoError(b, batch.Set(key, valBuf[:], nil))
}
require.NoError(b, batch.Commit(nil))
}
// Wait for compactions to complete before starting benchmarks. We don't
// want to benchmark while compactions are running.
d.mu.Lock()
for d.mu.compact.compactingCount > 0 {
d.mu.compact.cond.Wait()
}
d.mu.Unlock()
b.Log(d.Metrics().String())
require.NoError(b, d.Close())
// Set ignore syncs to true so that each subbenchmark may mutate state and
// then revert back to the original state.
mem.SetIgnoreSyncs(true)
// TODO(jackson): Benchmark lazy-combined iteration versus not.
// TODO(jackson): Benchmark seeks.
for _, rkSuffix := range []string{"@10", "@50", "@75", "@100"} {
b.Run(fmt.Sprintf("range-keys-suffixes=%s", rkSuffix), func(b *testing.B) {
d, err := Open("", opts)
require.NoError(b, err)
require.NoError(b, d.RangeKeySet([]byte("b"), []byte("e"), []byte(rkSuffix), nil, nil))
require.NoError(b, d.RangeKeySet([]byte("f"), []byte("p"), []byte(rkSuffix), nil, nil))
require.NoError(b, d.RangeKeySet([]byte("q"), []byte("z"), []byte(rkSuffix), nil, nil))
require.NoError(b, d.Flush())
// Populate 3 range keys, covering most of the keyspace, at the
// given suffix.
iterOpts := IterOptions{
KeyTypes: IterKeyTypePointsAndRanges,
RangeKeyMasking: RangeKeyMasking{
Suffix: []byte("@100"),
Filter: func() BlockPropertyFilterMask {
return sstable.NewTestKeysMaskingFilter()
},
},
}
b.Run("forward", func(b *testing.B) {
b.Run("seekprefix", func(b *testing.B) {
b.ResetTimer()
for i := 0; i < b.N; i++ {
iter, _ := d.NewIter(&iterOpts)
count := 0
for j := 0; j < len(keys); j++ {
if !iter.SeekPrefixGE(keys[j]) {
b.Errorf("unable to find %q\n", keys[j])
}
if hasPoint, _ := iter.HasPointAndRange(); hasPoint {
count++
}
}
if err := iter.Close(); err != nil {
b.Fatal(err)
}
}
})
b.Run("next", func(b *testing.B) {
b.ResetTimer()
for i := 0; i < b.N; i++ {
iter, _ := d.NewIter(&iterOpts)
count := 0
for valid := iter.First(); valid; valid = iter.Next() {
if hasPoint, _ := iter.HasPointAndRange(); hasPoint {
count++
}
}
if err := iter.Close(); err != nil {
b.Fatal(err)
}
}
})
})
b.Run("backward", func(b *testing.B) {
b.ResetTimer()
for i := 0; i < b.N; i++ {
iter, _ := d.NewIter(&iterOpts)
count := 0
for valid := iter.Last(); valid; valid = iter.Prev() {
if hasPoint, _ := iter.HasPointAndRange(); hasPoint {
count++
}
}
if err := iter.Close(); err != nil {
b.Fatal(err)
}
}
})
// Reset the benchmark state at the end of each run to remove the
// range keys we wrote.
b.StopTimer()
require.NoError(b, d.Close())
mem.ResetToSyncedState()
})
}
}
func BenchmarkIteratorScan(b *testing.B) {
const maxPrefixLen = 8
keyBuf := make([]byte, maxPrefixLen+testkeys.MaxSuffixLen)
rng := rand.New(rand.NewSource(uint64(time.Now().UnixNano())))
for _, keyCount := range []int64{100, 1000, 10000} {
for _, readAmp := range []int{1, 3, 7, 10} {
func() {
opts := &Options{
FS: vfs.NewMem(),
FormatMajorVersion: FormatNewest,
}
opts.DisableAutomaticCompactions = true
d, err := Open("", opts)
require.NoError(b, err)
defer func() { require.NoError(b, d.Close()) }()
// Take the very large keyspace consisting of alphabetic
// characters of lengths up to `maxPrefixLen` and reduce it down
// to `keyCount` keys by picking every 1 key every `keyCount` keys.
keys := testkeys.Alpha(maxPrefixLen)
keys = keys.EveryN(keys.Count() / keyCount)
if keys.Count() < keyCount {
b.Fatalf("expected %d keys, found %d", keyCount, keys.Count())
}
// Portion the keys into `readAmp` overlapping key sets.
for _, ks := range testkeys.Divvy(keys, int64(readAmp)) {
batch := d.NewBatch()
for i := int64(0); i < ks.Count(); i++ {
n := testkeys.WriteKeyAt(keyBuf[:], ks, i, rng.Int63n(100))
batch.Set(keyBuf[:n], keyBuf[:n], nil)
}
require.NoError(b, batch.Commit(nil))
require.NoError(b, d.Flush())
}
// Each level is a sublevel.
m := d.Metrics()
require.Equal(b, readAmp, m.ReadAmp())
for _, keyTypes := range []IterKeyType{IterKeyTypePointsOnly, IterKeyTypePointsAndRanges} {
iterOpts := IterOptions{KeyTypes: keyTypes}
b.Run(fmt.Sprintf("keys=%d,r-amp=%d,key-types=%s", keyCount, readAmp, keyTypes), func(b *testing.B) {
for i := 0; i < b.N; i++ {
b.StartTimer()
iter, _ := d.NewIter(&iterOpts)
valid := iter.First()
for valid {
valid = iter.Next()
}
b.StopTimer()
require.NoError(b, iter.Close())
}
})
}
}()
}
}
}
func BenchmarkIteratorScanNextPrefix(b *testing.B) {
setupBench := func(
b *testing.B, maxKeysPerLevel, versCount, readAmp int, enableValueBlocks bool) *DB {
keyBuf := make([]byte, readAmp+testkeys.MaxSuffixLen)
opts := &Options{
FS: vfs.NewMem(),
Comparer: testkeys.Comparer,
FormatMajorVersion: FormatNewest,
}
opts.DisableAutomaticCompactions = true
opts.Experimental.EnableValueBlocks = func() bool { return enableValueBlocks }
d, err := Open("", opts)
require.NoError(b, err)
// Create `readAmp` levels. Prefixes in the top of the LSM are length 1.
// Prefixes in the bottom of the LSM are length `readAmp`. Eg,:
//
// a b c...
// aa ab ac...
// aaa aab aac...
//
for l := readAmp; l > 0; l-- {
ks := testkeys.Alpha(l)
if step := ks.Count() / int64(maxKeysPerLevel); step > 1 {
ks = ks.EveryN(step)
}
if ks.Count() > int64(maxKeysPerLevel) {
ks = ks.Slice(0, int64(maxKeysPerLevel))
}
batch := d.NewBatch()
for i := int64(0); i < ks.Count(); i++ {
for v := 0; v < versCount; v++ {
n := testkeys.WriteKeyAt(keyBuf[:], ks, i, int64(versCount-v+1))
batch.Set(keyBuf[:n], keyBuf[:n], nil)
}
}
require.NoError(b, batch.Commit(nil))
require.NoError(b, d.Flush())
}
// Each level is a sublevel.
m := d.Metrics()
require.Equal(b, readAmp, m.ReadAmp())
return d
}
for _, keysPerLevel := range []int{10, 100, 1000} {
b.Run(fmt.Sprintf("keysPerLevel=%d", keysPerLevel), func(b *testing.B) {
for _, versionCount := range []int{1, 2, 10, 100} {
b.Run(fmt.Sprintf("versions=%d", versionCount), func(b *testing.B) {
for _, readAmp := range []int{1, 3, 7, 10} {
b.Run(fmt.Sprintf("ramp=%d", readAmp), func(b *testing.B) {
for _, enableValueBlocks := range []bool{false, true} {
b.Run(fmt.Sprintf("value-blocks=%t", enableValueBlocks), func(b *testing.B) {
d := setupBench(b, keysPerLevel, versionCount, readAmp, enableValueBlocks)
defer func() { require.NoError(b, d.Close()) }()
for _, keyTypes := range []IterKeyType{
IterKeyTypePointsOnly, IterKeyTypePointsAndRanges} {
b.Run(fmt.Sprintf("key-types=%s", keyTypes), func(b *testing.B) {
iterOpts := IterOptions{KeyTypes: keyTypes}
iter, _ := d.NewIter(&iterOpts)
var valid bool
b.ResetTimer()
for i := 0; i < b.N; i++ {
if !valid {
valid = iter.First()
if !valid {
b.Fatalf("iter must be valid")
}
} else {
valid = iter.NextPrefix()
}
}
b.StopTimer()
require.NoError(b, iter.Close())
})
}
})
}
})
}
})
}
})
}
}
func BenchmarkCombinedIteratorSeek(b *testing.B) {
for _, withRangeKey := range []bool{false, true} {
b.Run(fmt.Sprintf("range-key=%t", withRangeKey), func(b *testing.B) {
rng := rand.New(rand.NewSource(uint64(1658872515083979000)))
ks := testkeys.Alpha(1)
opts := &Options{
FS: vfs.NewMem(),
Comparer: testkeys.Comparer,
FormatMajorVersion: FormatNewest,
}
d, err := Open("", opts)
require.NoError(b, err)
defer func() { require.NoError(b, d.Close()) }()
keys := make([][]byte, ks.Count())
for i := int64(0); i < ks.Count(); i++ {
keys[i] = testkeys.Key(ks, i)
var val [40]byte
rng.Read(val[:])
require.NoError(b, d.Set(keys[i], val[:], nil))
}
if withRangeKey {
require.NoError(b, d.RangeKeySet([]byte("a"), []byte{'z', 0x00}, []byte("@5"), nil, nil))
}
batch := d.NewIndexedBatch()
defer batch.Close()
for _, useBatch := range []bool{false, true} {
b.Run(fmt.Sprintf("batch=%t", useBatch), func(b *testing.B) {
for i := 0; i < b.N; i++ {
iterOpts := IterOptions{KeyTypes: IterKeyTypePointsAndRanges}
var it *Iterator
if useBatch {
it, _ = batch.NewIter(&iterOpts)
} else {
it, _ = d.NewIter(&iterOpts)
}
for j := 0; j < len(keys); j++ {
if !it.SeekGE(keys[j]) {
b.Errorf("key %q missing", keys[j])
}
}
require.NoError(b, it.Close())
}
})
}
})
}
}
// BenchmarkCombinedIteratorSeek_Bounded benchmarks a bounded iterator that
// performs repeated seeks over 5% of the middle of a keyspace covered by a
// range key that's fragmented across hundreds of files. The iterator bounds
// should prevent defragmenting beyond the iterator's bounds.
func BenchmarkCombinedIteratorSeek_Bounded(b *testing.B) {
d, keys := buildFragmentedRangeKey(b, uint64(1658872515083979000))
var lower = len(keys) / 2
var upper = len(keys)/2 + len(keys)/20 // 5%
iterOpts := IterOptions{
KeyTypes: IterKeyTypePointsAndRanges,
LowerBound: keys[lower],
UpperBound: keys[upper],
}
b.ResetTimer()
for i := 0; i < b.N; i++ {
it, _ := d.NewIter(&iterOpts)
for j := lower; j < upper; j++ {
if !it.SeekGE(keys[j]) {
b.Errorf("key %q missing", keys[j])
}
}
require.NoError(b, it.Close())
}
}
// BenchmarkCombinedIteratorSeekPrefix benchmarks an iterator that
// performs repeated prefix seeks over 5% of the middle of a keyspace covered by a
// range key that's fragmented across hundreds of files. The seek prefix should
// avoid defragmenting beyond the seek prefixes.
func BenchmarkCombinedIteratorSeekPrefix(b *testing.B) {
d, keys := buildFragmentedRangeKey(b, uint64(1658872515083979000))
var lower = len(keys) / 2
var upper = len(keys)/2 + len(keys)/20 // 5%
iterOpts := IterOptions{
KeyTypes: IterKeyTypePointsAndRanges,
}
b.ResetTimer()
for i := 0; i < b.N; i++ {
it, _ := d.NewIter(&iterOpts)
for j := lower; j < upper; j++ {
if !it.SeekPrefixGE(keys[j]) {
b.Errorf("key %q missing", keys[j])
}
}
require.NoError(b, it.Close())
}
}
func buildFragmentedRangeKey(b testing.TB, seed uint64) (d *DB, keys [][]byte) {
rng := rand.New(rand.NewSource(seed))
ks := testkeys.Alpha(2)
opts := &Options{
FS: vfs.NewMem(),
Comparer: testkeys.Comparer,
FormatMajorVersion: FormatNewest,
L0CompactionFileThreshold: 1,
}
opts.EnsureDefaults()
for l := 0; l < len(opts.Levels); l++ {
opts.Levels[l].TargetFileSize = 1
}
var err error
d, err = Open("", opts)
require.NoError(b, err)
keys = make([][]byte, ks.Count())
for i := int64(0); i < ks.Count(); i++ {
keys[i] = testkeys.Key(ks, i)
}
for i := 0; i < len(keys); i++ {
var val [40]byte
rng.Read(val[:])
require.NoError(b, d.Set(keys[i], val[:], nil))
if i < len(keys)-1 {
require.NoError(b, d.RangeKeySet(keys[i], keys[i+1], []byte("@5"), nil, nil))
}
require.NoError(b, d.Flush())
}
d.mu.Lock()
for d.mu.compact.compactingCount > 0 {
d.mu.compact.cond.Wait()
}
v := d.mu.versions.currentVersion()
d.mu.Unlock()
require.GreaterOrEqualf(b, v.Levels[numLevels-1].Len(),
700, "expect many (≥700) L6 files but found %d", v.Levels[numLevels-1].Len())
return d, keys
}
// BenchmarkSeekPrefixTombstones benchmarks a SeekPrefixGE into the beginning of
// a series of sstables containing exclusively range tombstones. Previously,
// such a seek would next through all the tombstone files until it arrived at a
// point key or exhausted the level's files. The SeekPrefixGE should not next
// beyond the files that contain the prefix.
//
// See cockroachdb/cockroach#89327.
func BenchmarkSeekPrefixTombstones(b *testing.B) {
o := (&Options{
FS: vfs.NewMem(),
Comparer: testkeys.Comparer,
FormatMajorVersion: FormatNewest,
}).EnsureDefaults()
wOpts := o.MakeWriterOptions(numLevels-1, FormatNewest.MaxTableFormat())
d, err := Open("", o)
require.NoError(b, err)
defer func() { require.NoError(b, d.Close()) }()
// Keep a snapshot open for the duration of the test to prevent elision-only
// compactions from removing the ingested files containing exclusively
// elidable tombstones.
defer d.NewSnapshot().Close()
ks := testkeys.Alpha(2)
for i := int64(0); i < ks.Count()-1; i++ {
func() {
filename := fmt.Sprintf("ext%2d", i)
f, err := o.FS.Create(filename)
require.NoError(b, err)
w := sstable.NewWriter(objstorageprovider.NewFileWritable(f), wOpts)
require.NoError(b, w.DeleteRange(testkeys.Key(ks, i), testkeys.Key(ks, i+1)))
require.NoError(b, w.Close())
require.NoError(b, d.Ingest([]string{filename}))
}()
}
d.mu.Lock()
require.Equal(b, int64(ks.Count()-1), d.mu.versions.metrics.Levels[numLevels-1].NumFiles)
d.mu.Unlock()
seekKey := testkeys.Key(ks, 1)
iter, _ := d.NewIter(nil)
defer iter.Close()
b.ResetTimer()
defer b.StopTimer()
for i := 0; i < b.N; i++ {
iter.SeekPrefixGE(seekKey)
}
}
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