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level_checker_test.go
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level_checker_test.go
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// Copyright 2019 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"
"fmt"
"io"
"path/filepath"
"strings"
"testing"
"github.com/cockroachdb/datadriven"
"github.com/cockroachdb/errors"
"github.com/cockroachdb/pebble/internal/base"
"github.com/cockroachdb/pebble/internal/keyspan"
"github.com/cockroachdb/pebble/internal/manifest"
"github.com/cockroachdb/pebble/internal/private"
"github.com/cockroachdb/pebble/internal/rangedel"
"github.com/cockroachdb/pebble/objstorage/objstorageprovider"
"github.com/cockroachdb/pebble/sstable"
"github.com/cockroachdb/pebble/vfs"
"github.com/stretchr/testify/require"
)
func TestCheckLevelsBasics(t *testing.T) {
testCases := []string{"db-stage-1", "db-stage-2", "db-stage-3", "db-stage-4"}
for _, tc := range testCases {
t.Run(tc, func(t *testing.T) {
t.Logf("%s", t.Name())
fs := vfs.NewMem()
_, err := vfs.Clone(vfs.Default, fs, filepath.Join("testdata", tc), tc)
if err != nil {
t.Fatalf("%s: cloneFileSystem failed: %v", tc, err)
}
d, err := Open(tc, &Options{
FS: fs,
Logger: testLogger{t},
})
if err != nil {
t.Fatalf("%s: Open failed: %v", tc, err)
}
require.NoError(t, d.CheckLevels(nil))
require.NoError(t, d.Close())
})
}
}
type failMerger struct {
lastBuf []byte
closeCount int
}
func (f *failMerger) MergeNewer(value []byte) error {
return nil
}
func (f *failMerger) MergeOlder(value []byte) error {
if string(value) == "fail-merge" {
f.lastBuf = nil
return errors.New("merge failed")
}
f.lastBuf = append(f.lastBuf[:0], value...)
return nil
}
func (f *failMerger) Finish(includesBase bool) ([]byte, io.Closer, error) {
if string(f.lastBuf) == "fail-finish" {
f.lastBuf = nil
return nil, nil, errors.New("finish failed")
}
f.closeCount++
return nil, f, nil
}
func (f *failMerger) Close() error {
f.closeCount--
f.lastBuf = nil
return nil
}
func TestCheckLevelsCornerCases(t *testing.T) {
memFS := vfs.NewMem()
var levels [][]*fileMetadata
formatKey := DefaultComparer.FormatKey
// Indexed by fileNum
var readers []*sstable.Reader
defer func() {
for _, r := range readers {
r.Close()
}
}()
var fileNum FileNum
newIters :=
func(_ context.Context, file *manifest.FileMetadata, _ *IterOptions, _ internalIterOpts, _ iterKinds) (iterSet, error) {
r := readers[file.FileNum]
rangeDelIter, err := r.NewRawRangeDelIter(sstable.NoTransforms)
if err != nil {
return iterSet{}, err
}
iter, err := r.NewIter(sstable.NoTransforms, nil /* lower */, nil /* upper */)
if err != nil {
return iterSet{}, err
}
return iterSet{
point: iter,
rangeDeletion: rangeDelIter,
}, nil
}
fm := &failMerger{}
defer require.Equal(t, 0, fm.closeCount)
failMerger := &Merger{
Merge: func(key, value []byte) (ValueMerger, error) {
fm.lastBuf = append(fm.lastBuf[:0], value...)
return fm, nil
},
Name: "fail-merger",
}
datadriven.RunTest(t, "testdata/level_checker", func(t *testing.T, d *datadriven.TestData) string {
switch d.Cmd {
case "define":
lines := strings.Split(d.Input, "\n")
levels = levels[:0]
for i := 0; i < len(lines); i++ {
line := lines[i]
line = strings.TrimSpace(line)
if line == "L" {
// start next level
levels = append(levels, nil)
continue
}
li := &levels[len(levels)-1]
keys := strings.Fields(line)
smallestKey := base.ParseInternalKey(keys[0])
largestKey := base.ParseInternalKey(keys[1])
m := (&fileMetadata{
FileNum: fileNum,
}).ExtendPointKeyBounds(DefaultComparer.Compare, smallestKey, largestKey)
m.InitPhysicalBacking()
*li = append(*li, m)
i++
line = lines[i]
line = strings.TrimSpace(line)
name := fmt.Sprint(fileNum)
fileNum++
f, err := memFS.Create(name, vfs.WriteCategoryUnspecified)
if err != nil {
return err.Error()
}
writeUnfragmented := false
w := sstable.NewWriter(objstorageprovider.NewFileWritable(f), sstable.WriterOptions{})
for _, arg := range d.CmdArgs {
switch arg.Key {
case "disable-key-order-checks":
private.SSTableWriterDisableKeyOrderChecks(w)
case "write-unfragmented":
writeUnfragmented = true
default:
return fmt.Sprintf("unknown arg: %s", arg.Key)
}
}
var tombstones []keyspan.Span
frag := keyspan.Fragmenter{
Cmp: DefaultComparer.Compare,
Format: formatKey,
Emit: func(fragmented keyspan.Span) {
tombstones = append(tombstones, fragmented)
},
}
keyvalues := strings.Fields(line)
for _, kv := range keyvalues {
j := strings.Index(kv, ":")
ikey := base.ParseInternalKey(kv[:j])
value := []byte(kv[j+1:])
var err error
switch ikey.Kind() {
case InternalKeyKindRangeDelete:
if writeUnfragmented {
err = w.Add(ikey, value)
break
}
frag.Add(rangedel.Decode(ikey, value, nil))
default:
err = w.Add(ikey, value)
}
if err != nil {
return err.Error()
}
}
frag.Finish()
for _, v := range tombstones {
if err := rangedel.Encode(&v, w.Add); err != nil {
return err.Error()
}
}
if err := w.Close(); err != nil {
return err.Error()
}
f, err = memFS.Open(name)
if err != nil {
return err.Error()
}
readable, err := sstable.NewSimpleReadable(f)
if err != nil {
return err.Error()
}
cacheOpts := private.SSTableCacheOpts(0, base.DiskFileNum(fileNum-1)).(sstable.ReaderOption)
r, err := sstable.NewReader(readable, sstable.ReaderOptions{}, cacheOpts)
if err != nil {
return err.Error()
}
readers = append(readers, r)
}
// TODO(sbhola): clean this up by wrapping levels in a Version and using
// Version.DebugString().
var buf bytes.Buffer
for i, l := range levels {
fmt.Fprintf(&buf, "Level %d\n", i+1)
for j, f := range l {
fmt.Fprintf(&buf, " file %d: [%s-%s]\n", j, f.Smallest.String(), f.Largest.String())
}
}
return buf.String()
case "check":
merge := DefaultMerger.Merge
for _, arg := range d.CmdArgs {
switch arg.Key {
case "merger":
if len(arg.Vals) != 1 {
return fmt.Sprintf("expected one arg value, got %d", len(arg.Vals))
}
if arg.Vals[0] != failMerger.Name {
return "unsupported merger"
}
merge = failMerger.Merge
default:
return fmt.Sprintf("unknown arg: %s", arg.Key)
}
}
var files [numLevels][]*fileMetadata
for i := range levels {
// Start from level 1 in this test.
files[i+1] = levels[i]
}
version := manifest.NewVersion(
base.DefaultComparer,
0,
files)
readState := &readState{current: version}
c := &checkConfig{
comparer: DefaultComparer,
readState: readState,
newIters: newIters,
seqNum: InternalKeySeqNumMax,
merge: merge,
formatKey: formatKey,
}
if err := checkLevelsInternal(c); err != nil {
return err.Error()
}
return ""
default:
return fmt.Sprintf("unknown command: %s", d.Cmd)
}
})
}