forked from golang/leveldb
/
compaction_test.go
654 lines (628 loc) · 13.9 KB
/
compaction_test.go
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// Copyright 2013 The LevelDB-Go 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 leveldb
import (
"bytes"
"fmt"
"sort"
"strconv"
"strings"
"testing"
"time"
"github.com/starchou/leveldb/db"
"github.com/starchou/leveldb/memfs"
"github.com/starchou/leveldb/table"
)
func TestPickCompaction(t *testing.T) {
fileNums := func(f []fileMetadata) string {
ss := make([]string, 0, len(f))
for _, meta := range f {
ss = append(ss, strconv.Itoa(int(meta.fileNum)))
}
sort.Strings(ss)
return strings.Join(ss, ",")
}
testCases := []struct {
desc string
version version
want string
}{
{
desc: "no compaction",
version: version{
files: [numLevels][]fileMetadata{
0: []fileMetadata{
{
fileNum: 100,
size: 1,
smallest: makeIkey("i.SET.101"),
largest: makeIkey("j.SET.102"),
},
},
},
},
want: "",
},
{
desc: "1 L0 file",
version: version{
files: [numLevels][]fileMetadata{
0: []fileMetadata{
{
fileNum: 100,
size: 1,
smallest: makeIkey("i.SET.101"),
largest: makeIkey("j.SET.102"),
},
},
},
compactionScore: 99,
compactionLevel: 0,
},
want: "100 ",
},
{
desc: "2 L0 files (0 overlaps)",
version: version{
files: [numLevels][]fileMetadata{
0: []fileMetadata{
{
fileNum: 100,
size: 1,
smallest: makeIkey("i.SET.101"),
largest: makeIkey("j.SET.102"),
},
{
fileNum: 110,
size: 1,
smallest: makeIkey("k.SET.111"),
largest: makeIkey("l.SET.112"),
},
},
},
compactionScore: 99,
compactionLevel: 0,
},
want: "100 ",
},
{
desc: "2 L0 files, with ikey overlap",
version: version{
files: [numLevels][]fileMetadata{
0: []fileMetadata{
{
fileNum: 100,
size: 1,
smallest: makeIkey("i.SET.101"),
largest: makeIkey("p.SET.102"),
},
{
fileNum: 110,
size: 1,
smallest: makeIkey("j.SET.111"),
largest: makeIkey("q.SET.112"),
},
},
},
compactionScore: 99,
compactionLevel: 0,
},
want: "100,110 ",
},
{
desc: "2 L0 files, with ukey overlap",
version: version{
files: [numLevels][]fileMetadata{
0: []fileMetadata{
{
fileNum: 100,
size: 1,
smallest: makeIkey("i.SET.101"),
largest: makeIkey("i.SET.102"),
},
{
fileNum: 110,
size: 1,
smallest: makeIkey("i.SET.111"),
largest: makeIkey("i.SET.112"),
},
},
},
compactionScore: 99,
compactionLevel: 0,
},
want: "100,110 ",
},
{
desc: "1 L0 file, 2 L1 files (0 overlaps)",
version: version{
files: [numLevels][]fileMetadata{
0: []fileMetadata{
{
fileNum: 100,
size: 1,
smallest: makeIkey("i.SET.101"),
largest: makeIkey("i.SET.102"),
},
},
1: []fileMetadata{
{
fileNum: 200,
size: 1,
smallest: makeIkey("a.SET.201"),
largest: makeIkey("b.SET.202"),
},
{
fileNum: 210,
size: 1,
smallest: makeIkey("y.SET.211"),
largest: makeIkey("z.SET.212"),
},
},
},
compactionScore: 99,
compactionLevel: 0,
},
want: "100 ",
},
{
desc: "1 L0 file, 2 L1 files (1 overlap), 4 L2 files (3 overlaps)",
version: version{
files: [numLevels][]fileMetadata{
0: []fileMetadata{
{
fileNum: 100,
size: 1,
smallest: makeIkey("i.SET.101"),
largest: makeIkey("t.SET.102"),
},
},
1: []fileMetadata{
{
fileNum: 200,
size: 1,
smallest: makeIkey("a.SET.201"),
largest: makeIkey("e.SET.202"),
},
{
fileNum: 210,
size: 1,
smallest: makeIkey("f.SET.211"),
largest: makeIkey("j.SET.212"),
},
},
2: []fileMetadata{
{
fileNum: 300,
size: 1,
smallest: makeIkey("a.SET.301"),
largest: makeIkey("b.SET.302"),
},
{
fileNum: 310,
size: 1,
smallest: makeIkey("c.SET.311"),
largest: makeIkey("g.SET.312"),
},
{
fileNum: 320,
size: 1,
smallest: makeIkey("h.SET.321"),
largest: makeIkey("m.SET.322"),
},
{
fileNum: 330,
size: 1,
smallest: makeIkey("n.SET.331"),
largest: makeIkey("z.SET.332"),
},
},
},
compactionScore: 99,
compactionLevel: 0,
},
want: "100 210 310,320,330",
},
{
desc: "4 L1 files, 2 L2 files, can grow",
version: version{
files: [numLevels][]fileMetadata{
1: []fileMetadata{
{
fileNum: 200,
size: 1,
smallest: makeIkey("i1.SET.201"),
largest: makeIkey("i2.SET.202"),
},
{
fileNum: 210,
size: 1,
smallest: makeIkey("j1.SET.211"),
largest: makeIkey("j2.SET.212"),
},
{
fileNum: 220,
size: 1,
smallest: makeIkey("k1.SET.221"),
largest: makeIkey("k2.SET.222"),
},
{
fileNum: 230,
size: 1,
smallest: makeIkey("l1.SET.231"),
largest: makeIkey("l2.SET.232"),
},
},
2: []fileMetadata{
{
fileNum: 300,
size: 1,
smallest: makeIkey("a0.SET.301"),
largest: makeIkey("l0.SET.302"),
},
{
fileNum: 310,
size: 1,
smallest: makeIkey("l2.SET.311"),
largest: makeIkey("z2.SET.312"),
},
},
},
compactionScore: 99,
compactionLevel: 1,
},
want: "200,210,220 300 ",
},
{
desc: "4 L1 files, 2 L2 files, can't grow (range)",
version: version{
files: [numLevels][]fileMetadata{
1: []fileMetadata{
{
fileNum: 200,
size: 1,
smallest: makeIkey("i1.SET.201"),
largest: makeIkey("i2.SET.202"),
},
{
fileNum: 210,
size: 1,
smallest: makeIkey("j1.SET.211"),
largest: makeIkey("j2.SET.212"),
},
{
fileNum: 220,
size: 1,
smallest: makeIkey("k1.SET.221"),
largest: makeIkey("k2.SET.222"),
},
{
fileNum: 230,
size: 1,
smallest: makeIkey("l1.SET.231"),
largest: makeIkey("l2.SET.232"),
},
},
2: []fileMetadata{
{
fileNum: 300,
size: 1,
smallest: makeIkey("a0.SET.301"),
largest: makeIkey("j0.SET.302"),
},
{
fileNum: 310,
size: 1,
smallest: makeIkey("j2.SET.311"),
largest: makeIkey("z2.SET.312"),
},
},
},
compactionScore: 99,
compactionLevel: 1,
},
want: "200 300 ",
},
{
desc: "4 L1 files, 2 L2 files, can't grow (size)",
version: version{
files: [numLevels][]fileMetadata{
1: []fileMetadata{
{
fileNum: 200,
size: expandedCompactionByteSizeLimit - 1,
smallest: makeIkey("i1.SET.201"),
largest: makeIkey("i2.SET.202"),
},
{
fileNum: 210,
size: expandedCompactionByteSizeLimit - 1,
smallest: makeIkey("j1.SET.211"),
largest: makeIkey("j2.SET.212"),
},
{
fileNum: 220,
size: expandedCompactionByteSizeLimit - 1,
smallest: makeIkey("k1.SET.221"),
largest: makeIkey("k2.SET.222"),
},
{
fileNum: 230,
size: expandedCompactionByteSizeLimit - 1,
smallest: makeIkey("l1.SET.231"),
largest: makeIkey("l2.SET.232"),
},
},
2: []fileMetadata{
{
fileNum: 300,
size: expandedCompactionByteSizeLimit - 1,
smallest: makeIkey("a0.SET.301"),
largest: makeIkey("l0.SET.302"),
},
{
fileNum: 310,
size: expandedCompactionByteSizeLimit - 1,
smallest: makeIkey("l2.SET.311"),
largest: makeIkey("z2.SET.312"),
},
},
},
compactionScore: 99,
compactionLevel: 1,
},
want: "200 300 ",
},
}
for _, tc := range testCases {
vs := &versionSet{
ucmp: db.DefaultComparer,
icmp: internalKeyComparer{db.DefaultComparer},
}
vs.dummyVersion.prev = &vs.dummyVersion
vs.dummyVersion.next = &vs.dummyVersion
vs.append(&tc.version)
c, got := pickCompaction(vs), ""
if c != nil {
got0 := fileNums(c.inputs[0])
got1 := fileNums(c.inputs[1])
got2 := fileNums(c.inputs[2])
got = got0 + " " + got1 + " " + got2
}
if got != tc.want {
t.Fatalf("%s:\ngot %q\nwant %q", tc.desc, got, tc.want)
}
}
}
func TestIsBaseLevelForUkey(t *testing.T) {
testCases := []struct {
desc string
level int
version version
wants map[string]bool
}{
{
desc: "empty",
level: 1,
version: version{},
wants: map[string]bool{
"x": true,
},
},
{
desc: "non-empty",
level: 1,
version: version{
files: [numLevels][]fileMetadata{
1: []fileMetadata{
{
smallest: makeIkey("c.SET.801"),
largest: makeIkey("g.SET.800"),
},
{
smallest: makeIkey("x.SET.701"),
largest: makeIkey("y.SET.700"),
},
},
2: []fileMetadata{
{
smallest: makeIkey("d.SET.601"),
largest: makeIkey("h.SET.600"),
},
{
smallest: makeIkey("r.SET.501"),
largest: makeIkey("t.SET.500"),
},
},
3: []fileMetadata{
{
smallest: makeIkey("f.SET.401"),
largest: makeIkey("g.SET.400"),
},
{
smallest: makeIkey("w.SET.301"),
largest: makeIkey("x.SET.300"),
},
},
4: []fileMetadata{
{
smallest: makeIkey("f.SET.201"),
largest: makeIkey("m.SET.200"),
},
{
smallest: makeIkey("t.SET.101"),
largest: makeIkey("t.SET.100"),
},
},
},
},
wants: map[string]bool{
"b": true,
"c": true,
"d": true,
"e": true,
"f": false,
"g": false,
"h": false,
"l": false,
"m": false,
"n": true,
"q": true,
"r": true,
"s": true,
"t": false,
"u": true,
"v": true,
"w": false,
"x": false,
"y": true,
"z": true,
},
},
{
desc: "repeated ukey",
level: 1,
version: version{
files: [numLevels][]fileMetadata{
6: []fileMetadata{
{
smallest: makeIkey("i.SET.401"),
largest: makeIkey("i.SET.400"),
},
{
smallest: makeIkey("i.SET.301"),
largest: makeIkey("k.SET.300"),
},
{
smallest: makeIkey("k.SET.201"),
largest: makeIkey("m.SET.200"),
},
{
smallest: makeIkey("m.SET.101"),
largest: makeIkey("m.SET.100"),
},
},
},
},
wants: map[string]bool{
"h": true,
"i": false,
"j": false,
"k": false,
"l": false,
"m": false,
"n": true,
},
},
}
for _, tc := range testCases {
c := compaction{
version: &tc.version,
level: tc.level,
}
for ukey, want := range tc.wants {
if got := c.isBaseLevelForUkey(db.DefaultComparer, []byte(ukey)); got != want {
t.Errorf("%s: ukey=%q: got %v, want %v", tc.desc, ukey, got, want)
}
}
}
}
func TestCompaction(t *testing.T) {
const writeBufferSize = 1000
fs := memfs.New()
d, err := Open("", &db.Options{
FileSystem: fs,
WriteBufferSize: writeBufferSize,
})
if err != nil {
t.Fatalf("Open: %v", err)
}
get1 := func(x db.DB) (ret string) {
b := &bytes.Buffer{}
iter := x.Find(nil, nil)
for iter.Next() {
b.Write(internalKey(iter.Key()).ukey())
}
if err := iter.Close(); err != nil {
t.Fatalf("iterator Close: %v", err)
}
return b.String()
}
getAll := func() (gotMem, gotDisk string, err error) {
d.mu.Lock()
defer d.mu.Unlock()
if d.mem != nil {
gotMem = get1(d.mem)
}
ss := []string(nil)
v := d.versions.currentVersion()
for _, files := range v.files {
for _, meta := range files {
f, err := fs.Open(dbFilename("", fileTypeTable, meta.fileNum))
if err != nil {
return "", "", fmt.Errorf("Open: %v", err)
}
defer f.Close()
r := table.NewReader(f, &db.Options{
Comparer: internalKeyComparer{db.DefaultComparer},
})
defer r.Close()
ss = append(ss, get1(r)+".")
}
}
sort.Strings(ss)
return gotMem, strings.Join(ss, ""), nil
}
value := bytes.Repeat([]byte("x"), writeBufferSize*6/10)
testCases := []struct {
key, wantMem, wantDisk string
}{
{"+A", "A", ""},
{"+a", "Aa", ""},
{"+B", "B", "Aa."},
{"+b", "Bb", "Aa."},
// The next level-0 table overwrites the B key.
{"+C", "C", "Aa.Bb."},
{"+B", "BC", "Aa.Bb."},
// The next level-0 table deletes the a key.
{"+D", "D", "Aa.BC.Bb."},
{"-a", "Da", "Aa.BC.Bb."},
{"+d", "Dad", "Aa.BC.Bb."},
// The next addition creates the fourth level-0 table, and l0CompactionTrigger == 4,
// so this triggers a non-trivial compaction into one level-1 table. Note that the
// keys in this one larger table are interleaved from the four smaller ones.
{"+E", "E", "ABCDbd."},
{"+e", "Ee", "ABCDbd."},
{"+F", "F", "ABCDbd.Ee."},
}
for _, tc := range testCases {
if key := tc.key[1:]; tc.key[0] == '+' {
if err := d.Set([]byte(key), value, nil); err != nil {
t.Errorf("%q: Set: %v", key, err)
break
}
} else {
if err := d.Delete([]byte(key), nil); err != nil {
t.Errorf("%q: Delete: %v", key, err)
break
}
}
// Allow any writes to the memfs to complete.
time.Sleep(1 * time.Millisecond)
gotMem, gotDisk, err := getAll()
if err != nil {
t.Errorf("%q: %v", tc.key, err)
break
}
if gotMem != tc.wantMem {
t.Errorf("%q: mem: got %q, want %q", tc.key, gotMem, tc.wantMem)
}
if gotDisk != tc.wantDisk {
t.Errorf("%q: ldb: got %q, want %q", tc.key, gotDisk, tc.wantDisk)
}
}
if err := d.Close(); err != nil {
t.Fatalf("db Close: %v", err)
}
}