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levels_test.go
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/*
* Copyright 2019 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 (
"fmt"
"math"
"math/rand"
"os"
"sort"
"testing"
"time"
"github.com/dgraph-io/badger/v3/options"
"github.com/dgraph-io/badger/v3/pb"
"github.com/dgraph-io/badger/v3/table"
"github.com/dgraph-io/badger/v3/y"
"github.com/stretchr/testify/require"
)
// createAndOpen creates a table with the given data and adds it to the given level.
func createAndOpen(db *DB, td []keyValVersion, level int) {
opts := table.Options{
BlockSize: db.opt.BlockSize,
BloomFalsePositive: db.opt.BloomFalsePositive,
ChkMode: options.NoVerification,
}
b := table.NewTableBuilder(opts)
defer b.Close()
// Add all keys and versions to the table.
for _, item := range td {
key := y.KeyWithTs([]byte(item.key), uint64(item.version))
val := y.ValueStruct{Value: []byte(item.val), Meta: item.meta}
b.Add(key, val, 0)
}
fname := table.NewFilename(db.lc.reserveFileID(), db.opt.Dir)
tab, err := table.CreateTable(fname, b)
if err != nil {
panic(err)
}
if err := db.manifest.addChanges([]*pb.ManifestChange{
newCreateChange(tab.ID(), level, 0, tab.CompressionType()),
}); err != nil {
panic(err)
}
db.lc.levels[level].Lock()
// Add table to the given level.
db.lc.levels[level].tables = append(db.lc.levels[level].tables, tab)
db.lc.levels[level].Unlock()
}
type keyValVersion struct {
key string
val string
version int
meta byte
}
func TestCheckOverlap(t *testing.T) {
t.Run("overlap", func(t *testing.T) {
// This test consists of one table on level 0 and one on level 1.
// There is an overlap amongst the tables but there is no overlap
// with rest of the levels.
t.Run("same keys", func(t *testing.T) {
runBadgerTest(t, nil, func(t *testing.T, db *DB) {
l0 := []keyValVersion{{"foo", "bar", 3, 0}}
l1 := []keyValVersion{{"foo", "bar", 2, 0}}
createAndOpen(db, l0, 0)
createAndOpen(db, l1, 1)
// Level 0 should overlap with level 0 tables.
require.True(t, db.lc.checkOverlap(db.lc.levels[0].tables, 0))
// Level 1 should overlap with level 0 tables (they have the same keys).
require.True(t, db.lc.checkOverlap(db.lc.levels[0].tables, 1))
// Level 2 and 3 should not overlap with level 0 tables.
require.False(t, db.lc.checkOverlap(db.lc.levels[0].tables, 2))
require.False(t, db.lc.checkOverlap(db.lc.levels[1].tables, 2))
require.False(t, db.lc.checkOverlap(db.lc.levels[0].tables, 3))
require.False(t, db.lc.checkOverlap(db.lc.levels[1].tables, 3))
})
})
t.Run("overlapping keys", func(t *testing.T) {
runBadgerTest(t, nil, func(t *testing.T, db *DB) {
l0 := []keyValVersion{{"a", "x", 1, 0}, {"b", "x", 1, 0}, {"foo", "bar", 3, 0}}
l1 := []keyValVersion{{"foo", "bar", 2, 0}}
createAndOpen(db, l0, 0)
createAndOpen(db, l1, 1)
// Level 0 should overlap with level 0 tables.
require.True(t, db.lc.checkOverlap(db.lc.levels[0].tables, 0))
require.True(t, db.lc.checkOverlap(db.lc.levels[1].tables, 1))
// Level 1 should overlap with level 0 tables, "foo" key is common.
require.True(t, db.lc.checkOverlap(db.lc.levels[0].tables, 1))
// Level 2 and 3 should not overlap with level 0 tables.
require.False(t, db.lc.checkOverlap(db.lc.levels[0].tables, 2))
require.False(t, db.lc.checkOverlap(db.lc.levels[0].tables, 3))
})
})
})
t.Run("non-overlapping", func(t *testing.T) {
runBadgerTest(t, nil, func(t *testing.T, db *DB) {
l0 := []keyValVersion{{"a", "x", 1, 0}, {"b", "x", 1, 0}, {"c", "bar", 3, 0}}
l1 := []keyValVersion{{"foo", "bar", 2, 0}}
createAndOpen(db, l0, 0)
createAndOpen(db, l1, 1)
// Level 1 should not overlap with level 0 tables
require.False(t, db.lc.checkOverlap(db.lc.levels[0].tables, 1))
// Level 2 and 3 should not overlap with level 0 tables.
require.False(t, db.lc.checkOverlap(db.lc.levels[0].tables, 2))
require.False(t, db.lc.checkOverlap(db.lc.levels[0].tables, 3))
})
})
}
func getAllAndCheck(t *testing.T, db *DB, expected []keyValVersion) {
db.View(func(txn *Txn) error {
opt := DefaultIteratorOptions
opt.AllVersions = true
opt.InternalAccess = true
it := txn.NewIterator(opt)
defer it.Close()
i := 0
for it.Rewind(); it.Valid(); it.Next() {
item := it.Item()
v, err := item.ValueCopy(nil)
require.NoError(t, err)
// fmt.Printf("k: %s v: %d val: %s\n", item.key, item.Version(), v)
require.Less(t, i, len(expected), "DB has more number of key than expected")
expect := expected[i]
require.Equal(t, expect.key, string(item.Key()), "expected key: %s actual key: %s",
expect.key, item.Key())
require.Equal(t, expect.val, string(v), "key: %s expected value: %s actual %s",
item.key, expect.val, v)
require.Equal(t, expect.version, int(item.Version()),
"key: %s expected version: %d actual %d", item.key, expect.version, item.Version())
require.Equal(t, expect.meta, item.meta,
"key: %s expected meta: %d meta %d", item.key, expect.meta, item.meta)
i++
}
require.Equal(t, len(expected), i, "keys examined should be equal to keys expected")
return nil
})
}
func TestCompaction(t *testing.T) {
// Disable compactions and keep single version of each key.
opt := DefaultOptions("").WithNumCompactors(0).WithNumVersionsToKeep(1)
opt.managedTxns = true
t.Run("level 0 to level 1", func(t *testing.T) {
runBadgerTest(t, &opt, func(t *testing.T, db *DB) {
l0 := []keyValVersion{{"foo", "bar", 3, 0}, {"fooz", "baz", 1, 0}}
l01 := []keyValVersion{{"foo", "bar", 2, 0}}
l1 := []keyValVersion{{"foo", "bar", 1, 0}}
// Level 0 has table l0 and l01.
createAndOpen(db, l0, 0)
createAndOpen(db, l01, 0)
// Level 1 has table l1.
createAndOpen(db, l1, 1)
// Set a high discard timestamp so that all the keys are below the discard timestamp.
db.SetDiscardTs(10)
getAllAndCheck(t, db, []keyValVersion{
{"foo", "bar", 3, 0}, {"foo", "bar", 2, 0},
{"foo", "bar", 1, 0}, {"fooz", "baz", 1, 0},
})
cdef := compactDef{
thisLevel: db.lc.levels[0],
nextLevel: db.lc.levels[1],
top: db.lc.levels[0].tables,
bot: db.lc.levels[1].tables,
t: db.lc.levelTargets(),
}
cdef.t.baseLevel = 1
require.NoError(t, db.lc.runCompactDef(-1, 0, cdef))
// foo version 2 should be dropped after compaction.
getAllAndCheck(t, db, []keyValVersion{{"foo", "bar", 3, 0}, {"fooz", "baz", 1, 0}})
})
})
t.Run("level 0 to level 1 with duplicates", func(t *testing.T) {
runBadgerTest(t, &opt, func(t *testing.T, db *DB) {
// We have foo version 3 on L0 because we gc'ed it.
l0 := []keyValVersion{{"foo", "barNew", 3, 0}, {"fooz", "baz", 1, 0}}
l01 := []keyValVersion{{"foo", "bar", 4, 0}}
l1 := []keyValVersion{{"foo", "bar", 3, 0}}
// Level 0 has table l0 and l01.
createAndOpen(db, l0, 0)
createAndOpen(db, l01, 0)
// Level 1 has table l1.
createAndOpen(db, l1, 1)
// Set a high discard timestamp so that all the keys are below the discard timestamp.
db.SetDiscardTs(10)
getAllAndCheck(t, db, []keyValVersion{
{"foo", "bar", 4, 0}, {"foo", "barNew", 3, 0},
{"fooz", "baz", 1, 0},
})
cdef := compactDef{
thisLevel: db.lc.levels[0],
nextLevel: db.lc.levels[1],
top: db.lc.levels[0].tables,
bot: db.lc.levels[1].tables,
t: db.lc.levelTargets(),
}
cdef.t.baseLevel = 1
require.NoError(t, db.lc.runCompactDef(-1, 0, cdef))
// foo version 3 (both) should be dropped after compaction.
getAllAndCheck(t, db, []keyValVersion{{"foo", "bar", 4, 0}, {"fooz", "baz", 1, 0}})
})
})
t.Run("level 0 to level 1 with lower overlap", func(t *testing.T) {
runBadgerTest(t, &opt, func(t *testing.T, db *DB) {
l0 := []keyValVersion{{"foo", "bar", 3, 0}, {"fooz", "baz", 1, 0}}
l01 := []keyValVersion{{"foo", "bar", 2, 0}}
l1 := []keyValVersion{{"foo", "bar", 1, 0}}
l2 := []keyValVersion{{"foo", "bar", 0, 0}}
// Level 0 has table l0 and l01.
createAndOpen(db, l0, 0)
createAndOpen(db, l01, 0)
// Level 1 has table l1.
createAndOpen(db, l1, 1)
// Level 2 has table l2.
createAndOpen(db, l2, 2)
// Set a high discard timestamp so that all the keys are below the discard timestamp.
db.SetDiscardTs(10)
getAllAndCheck(t, db, []keyValVersion{
{"foo", "bar", 3, 0}, {"foo", "bar", 2, 0}, {"foo", "bar", 1, 0},
{"foo", "bar", 0, 0}, {"fooz", "baz", 1, 0},
})
cdef := compactDef{
thisLevel: db.lc.levels[0],
nextLevel: db.lc.levels[1],
top: db.lc.levels[0].tables,
bot: db.lc.levels[1].tables,
t: db.lc.levelTargets(),
}
cdef.t.baseLevel = 1
require.NoError(t, db.lc.runCompactDef(-1, 0, cdef))
// foo version 2 and version 1 should be dropped after compaction.
getAllAndCheck(t, db, []keyValVersion{
{"foo", "bar", 3, 0}, {"foo", "bar", 0, 0}, {"fooz", "baz", 1, 0},
})
})
})
t.Run("level 1 to level 2", func(t *testing.T) {
runBadgerTest(t, &opt, func(t *testing.T, db *DB) {
l1 := []keyValVersion{{"foo", "bar", 3, 0}, {"fooz", "baz", 1, 0}}
l2 := []keyValVersion{{"foo", "bar", 2, 0}}
createAndOpen(db, l1, 1)
createAndOpen(db, l2, 2)
// Set a high discard timestamp so that all the keys are below the discard timestamp.
db.SetDiscardTs(10)
getAllAndCheck(t, db, []keyValVersion{
{"foo", "bar", 3, 0}, {"foo", "bar", 2, 0}, {"fooz", "baz", 1, 0},
})
cdef := compactDef{
thisLevel: db.lc.levels[1],
nextLevel: db.lc.levels[2],
top: db.lc.levels[1].tables,
bot: db.lc.levels[2].tables,
t: db.lc.levelTargets(),
}
cdef.t.baseLevel = 2
require.NoError(t, db.lc.runCompactDef(-1, 1, cdef))
// foo version 2 should be dropped after compaction.
getAllAndCheck(t, db, []keyValVersion{{"foo", "bar", 3, 0}, {"fooz", "baz", 1, 0}})
})
})
t.Run("level 1 to level 2 with delete", func(t *testing.T) {
t.Run("with overlap", func(t *testing.T) {
runBadgerTest(t, &opt, func(t *testing.T, db *DB) {
l1 := []keyValVersion{{"foo", "bar", 3, bitDelete}, {"fooz", "baz", 1, bitDelete}}
l2 := []keyValVersion{{"foo", "bar", 2, 0}}
l3 := []keyValVersion{{"foo", "bar", 1, 0}}
createAndOpen(db, l1, 1)
createAndOpen(db, l2, 2)
createAndOpen(db, l3, 3)
// Set a high discard timestamp so that all the keys are below the discard timestamp.
db.SetDiscardTs(10)
getAllAndCheck(t, db, []keyValVersion{
{"foo", "bar", 3, 1},
{"foo", "bar", 2, 0},
{"foo", "bar", 1, 0},
{"fooz", "baz", 1, 1},
})
cdef := compactDef{
thisLevel: db.lc.levels[1],
nextLevel: db.lc.levels[2],
top: db.lc.levels[1].tables,
bot: db.lc.levels[2].tables,
t: db.lc.levelTargets(),
}
cdef.t.baseLevel = 2
require.NoError(t, db.lc.runCompactDef(-1, 1, cdef))
// foo bar version 2 should be dropped after compaction. fooz
// baz version 1 will remain because overlap exists, which is
// expected because `hasOverlap` is only checked once at the
// beginning of `compactBuildTables` method.
// everything from level 1 is now in level 2.
getAllAndCheck(t, db, []keyValVersion{
{"foo", "bar", 3, bitDelete},
{"foo", "bar", 1, 0},
{"fooz", "baz", 1, 1},
})
cdef = compactDef{
thisLevel: db.lc.levels[2],
nextLevel: db.lc.levels[3],
top: db.lc.levels[2].tables,
bot: db.lc.levels[3].tables,
t: db.lc.levelTargets(),
}
cdef.t.baseLevel = 3
require.NoError(t, db.lc.runCompactDef(-1, 2, cdef))
// everything should be removed now
getAllAndCheck(t, db, []keyValVersion{})
})
})
t.Run("with bottom overlap", func(t *testing.T) {
runBadgerTest(t, &opt, func(t *testing.T, db *DB) {
l1 := []keyValVersion{{"foo", "bar", 3, bitDelete}}
l2 := []keyValVersion{{"foo", "bar", 2, 0}, {"fooz", "baz", 2, bitDelete}}
l3 := []keyValVersion{{"fooz", "baz", 1, 0}}
createAndOpen(db, l1, 1)
createAndOpen(db, l2, 2)
createAndOpen(db, l3, 3)
// Set a high discard timestamp so that all the keys are below the discard timestamp.
db.SetDiscardTs(10)
getAllAndCheck(t, db, []keyValVersion{
{"foo", "bar", 3, bitDelete},
{"foo", "bar", 2, 0},
{"fooz", "baz", 2, bitDelete},
{"fooz", "baz", 1, 0},
})
cdef := compactDef{
thisLevel: db.lc.levels[1],
nextLevel: db.lc.levels[2],
top: db.lc.levels[1].tables,
bot: db.lc.levels[2].tables,
t: db.lc.levelTargets(),
}
cdef.t.baseLevel = 2
require.NoError(t, db.lc.runCompactDef(-1, 1, cdef))
// the top table at L1 doesn't overlap L3, but the bottom table at L2
// does, delete keys should not be removed.
getAllAndCheck(t, db, []keyValVersion{
{"foo", "bar", 3, bitDelete},
{"fooz", "baz", 2, bitDelete},
{"fooz", "baz", 1, 0},
})
})
})
t.Run("without overlap", func(t *testing.T) {
runBadgerTest(t, &opt, func(t *testing.T, db *DB) {
l1 := []keyValVersion{{"foo", "bar", 3, bitDelete}, {"fooz", "baz", 1, bitDelete}}
l2 := []keyValVersion{{"fooo", "barr", 2, 0}}
createAndOpen(db, l1, 1)
createAndOpen(db, l2, 2)
// Set a high discard timestamp so that all the keys are below the discard timestamp.
db.SetDiscardTs(10)
getAllAndCheck(t, db, []keyValVersion{
{"foo", "bar", 3, 1}, {"fooo", "barr", 2, 0}, {"fooz", "baz", 1, 1},
})
cdef := compactDef{
thisLevel: db.lc.levels[1],
nextLevel: db.lc.levels[2],
top: db.lc.levels[1].tables,
bot: db.lc.levels[2].tables,
t: db.lc.levelTargets(),
}
cdef.t.baseLevel = 2
require.NoError(t, db.lc.runCompactDef(-1, 1, cdef))
// foo version 2 should be dropped after compaction.
getAllAndCheck(t, db, []keyValVersion{{"fooo", "barr", 2, 0}})
})
})
t.Run("with splits", func(t *testing.T) {
runBadgerTest(t, &opt, func(t *testing.T, db *DB) {
l1 := []keyValVersion{{"C", "bar", 3, bitDelete}}
l21 := []keyValVersion{{"A", "bar", 2, 0}}
l22 := []keyValVersion{{"B", "bar", 2, 0}}
l23 := []keyValVersion{{"C", "bar", 2, 0}}
l24 := []keyValVersion{{"D", "bar", 2, 0}}
l3 := []keyValVersion{{"fooz", "baz", 1, 0}}
createAndOpen(db, l1, 1)
createAndOpen(db, l21, 2)
createAndOpen(db, l22, 2)
createAndOpen(db, l23, 2)
createAndOpen(db, l24, 2)
createAndOpen(db, l3, 3)
// Set a high discard timestamp so that all the keys are below the discard timestamp.
db.SetDiscardTs(10)
getAllAndCheck(t, db, []keyValVersion{
{"A", "bar", 2, 0},
{"B", "bar", 2, 0},
{"C", "bar", 3, bitDelete},
{"C", "bar", 2, 0},
{"D", "bar", 2, 0},
{"fooz", "baz", 1, 0},
})
cdef := compactDef{
thisLevel: db.lc.levels[1],
nextLevel: db.lc.levels[2],
top: db.lc.levels[1].tables,
bot: db.lc.levels[2].tables,
t: db.lc.levelTargets(),
}
cdef.t.baseLevel = 2
require.NoError(t, db.lc.runCompactDef(-1, 1, cdef))
getAllAndCheck(t, db, []keyValVersion{
{"A", "bar", 2, 0},
{"B", "bar", 2, 0},
{"D", "bar", 2, 0},
{"fooz", "baz", 1, 0},
})
})
})
})
}
func TestCompactionTwoVersions(t *testing.T) {
// Disable compactions and keep two versions of each key.
opt := DefaultOptions("").WithNumCompactors(0).WithNumVersionsToKeep(2)
opt.managedTxns = true
t.Run("with overlap", func(t *testing.T) {
runBadgerTest(t, &opt, func(t *testing.T, db *DB) {
l1 := []keyValVersion{{"foo", "bar", 3, 0}, {"fooz", "baz", 1, bitDelete}}
l2 := []keyValVersion{{"foo", "bar", 2, 0}}
l3 := []keyValVersion{{"foo", "bar", 1, 0}}
createAndOpen(db, l1, 1)
createAndOpen(db, l2, 2)
createAndOpen(db, l3, 3)
// Set a high discard timestamp so that all the keys are below the discard timestamp.
db.SetDiscardTs(10)
getAllAndCheck(t, db, []keyValVersion{
{"foo", "bar", 3, 0},
{"foo", "bar", 2, 0},
{"foo", "bar", 1, 0},
{"fooz", "baz", 1, 1},
})
cdef := compactDef{
thisLevel: db.lc.levels[1],
nextLevel: db.lc.levels[2],
top: db.lc.levels[1].tables,
bot: db.lc.levels[2].tables,
t: db.lc.levelTargets(),
}
cdef.t.baseLevel = 2
require.NoError(t, db.lc.runCompactDef(-1, 1, cdef))
// Nothing should be dropped after compaction because number of
// versions to keep is 2.
getAllAndCheck(t, db, []keyValVersion{
{"foo", "bar", 3, 0},
{"foo", "bar", 2, 0},
{"foo", "bar", 1, 0},
{"fooz", "baz", 1, 1},
})
cdef = compactDef{
thisLevel: db.lc.levels[2],
nextLevel: db.lc.levels[3],
top: db.lc.levels[2].tables,
bot: db.lc.levels[3].tables,
t: db.lc.levelTargets(),
}
cdef.t.baseLevel = 3
require.NoError(t, db.lc.runCompactDef(-1, 2, cdef))
getAllAndCheck(t, db, []keyValVersion{
{"foo", "bar", 3, 0},
{"foo", "bar", 2, 0},
})
})
})
}
func TestCompactionAllVersions(t *testing.T) {
// Disable compactions and keep all versions of the each key.
opt := DefaultOptions("").WithNumCompactors(0).WithNumVersionsToKeep(math.MaxInt32)
opt.managedTxns = true
t.Run("without overlap", func(t *testing.T) {
runBadgerTest(t, &opt, func(t *testing.T, db *DB) {
l1 := []keyValVersion{{"foo", "bar", 3, 0}, {"fooz", "baz", 1, bitDelete}}
l2 := []keyValVersion{{"foo", "bar", 2, 0}}
l3 := []keyValVersion{{"foo", "bar", 1, 0}}
createAndOpen(db, l1, 1)
createAndOpen(db, l2, 2)
createAndOpen(db, l3, 3)
// Set a high discard timestamp so that all the keys are below the discard timestamp.
db.SetDiscardTs(10)
getAllAndCheck(t, db, []keyValVersion{
{"foo", "bar", 3, 0},
{"foo", "bar", 2, 0},
{"foo", "bar", 1, 0},
{"fooz", "baz", 1, 1},
})
cdef := compactDef{
thisLevel: db.lc.levels[1],
nextLevel: db.lc.levels[2],
top: db.lc.levels[1].tables,
bot: db.lc.levels[2].tables,
t: db.lc.levelTargets(),
}
cdef.t.baseLevel = 2
require.NoError(t, db.lc.runCompactDef(-1, 1, cdef))
// Nothing should be dropped after compaction because all versions
// should be kept.
getAllAndCheck(t, db, []keyValVersion{
{"foo", "bar", 3, 0},
{"foo", "bar", 2, 0},
{"foo", "bar", 1, 0},
{"fooz", "baz", 1, 1},
})
cdef = compactDef{
thisLevel: db.lc.levels[2],
nextLevel: db.lc.levels[3],
top: db.lc.levels[2].tables,
bot: db.lc.levels[3].tables,
t: db.lc.levelTargets(),
}
cdef.t.baseLevel = 3
require.NoError(t, db.lc.runCompactDef(-1, 2, cdef))
getAllAndCheck(t, db, []keyValVersion{
{"foo", "bar", 3, 0},
{"foo", "bar", 2, 0},
{"foo", "bar", 1, 0},
})
})
})
t.Run("without overlap", func(t *testing.T) {
runBadgerTest(t, &opt, func(t *testing.T, db *DB) {
l1 := []keyValVersion{{"foo", "bar", 3, bitDelete}, {"fooz", "baz", 1, bitDelete}}
l2 := []keyValVersion{{"fooo", "barr", 2, 0}}
createAndOpen(db, l1, 1)
createAndOpen(db, l2, 2)
// Set a high discard timestamp so that all the keys are below the discard timestamp.
db.SetDiscardTs(10)
getAllAndCheck(t, db, []keyValVersion{
{"foo", "bar", 3, 1}, {"fooo", "barr", 2, 0}, {"fooz", "baz", 1, 1},
})
cdef := compactDef{
thisLevel: db.lc.levels[1],
nextLevel: db.lc.levels[2],
top: db.lc.levels[1].tables,
bot: db.lc.levels[2].tables,
t: db.lc.levelTargets(),
}
cdef.t.baseLevel = 2
require.NoError(t, db.lc.runCompactDef(-1, 1, cdef))
// foo version 2 should be dropped after compaction.
getAllAndCheck(t, db, []keyValVersion{{"fooo", "barr", 2, 0}})
})
})
}
func TestDiscardTs(t *testing.T) {
// Disable compactions and keep single version of each key.
opt := DefaultOptions("").WithNumCompactors(0).WithNumVersionsToKeep(1)
opt.managedTxns = true
t.Run("all keys above discardTs", func(t *testing.T) {
runBadgerTest(t, &opt, func(t *testing.T, db *DB) {
l0 := []keyValVersion{{"foo", "bar", 4, 0}, {"fooz", "baz", 3, 0}}
l01 := []keyValVersion{{"foo", "bar", 3, 0}}
l1 := []keyValVersion{{"foo", "bar", 2, 0}}
// Level 0 has table l0 and l01.
createAndOpen(db, l0, 0)
createAndOpen(db, l01, 0)
// Level 1 has table l1.
createAndOpen(db, l1, 1)
// Set dicardTs to 1. All the keys are above discardTs.
db.SetDiscardTs(1)
getAllAndCheck(t, db, []keyValVersion{
{"foo", "bar", 4, 0}, {"foo", "bar", 3, 0},
{"foo", "bar", 2, 0}, {"fooz", "baz", 3, 0},
})
cdef := compactDef{
thisLevel: db.lc.levels[0],
nextLevel: db.lc.levels[1],
top: db.lc.levels[0].tables,
bot: db.lc.levels[1].tables,
t: db.lc.levelTargets(),
}
cdef.t.baseLevel = 1
require.NoError(t, db.lc.runCompactDef(-1, 0, cdef))
// No keys should be dropped.
getAllAndCheck(t, db, []keyValVersion{
{"foo", "bar", 4, 0}, {"foo", "bar", 3, 0},
{"foo", "bar", 2, 0}, {"fooz", "baz", 3, 0},
})
})
})
t.Run("some keys above discardTs", func(t *testing.T) {
runBadgerTest(t, &opt, func(t *testing.T, db *DB) {
l0 := []keyValVersion{
{"foo", "bar", 4, 0}, {"foo", "bar", 3, 0},
{"foo", "bar", 2, 0}, {"fooz", "baz", 2, 0},
}
l1 := []keyValVersion{{"foo", "bbb", 1, 0}}
createAndOpen(db, l0, 0)
createAndOpen(db, l1, 1)
// Set dicardTs to 3. foo2 and foo1 should be dropped.
db.SetDiscardTs(3)
getAllAndCheck(t, db, []keyValVersion{
{"foo", "bar", 4, 0}, {"foo", "bar", 3, 0}, {"foo", "bar", 2, 0},
{"foo", "bbb", 1, 0}, {"fooz", "baz", 2, 0},
})
cdef := compactDef{
thisLevel: db.lc.levels[0],
nextLevel: db.lc.levels[1],
top: db.lc.levels[0].tables,
bot: db.lc.levels[1].tables,
t: db.lc.levelTargets(),
}
cdef.t.baseLevel = 1
require.NoError(t, db.lc.runCompactDef(-1, 0, cdef))
// foo1 and foo2 should be dropped.
getAllAndCheck(t, db, []keyValVersion{
{"foo", "bar", 4, 0}, {"foo", "bar", 3, 0}, {"fooz", "baz", 2, 0},
})
})
})
t.Run("all keys below discardTs", func(t *testing.T) {
runBadgerTest(t, &opt, func(t *testing.T, db *DB) {
l0 := []keyValVersion{{"foo", "bar", 4, 0}, {"fooz", "baz", 3, 0}}
l01 := []keyValVersion{{"foo", "bar", 3, 0}}
l1 := []keyValVersion{{"foo", "bar", 2, 0}}
// Level 0 has table l0 and l01.
createAndOpen(db, l0, 0)
createAndOpen(db, l01, 0)
// Level 1 has table l1.
createAndOpen(db, l1, 1)
// Set dicardTs to 10. All the keys are below discardTs.
db.SetDiscardTs(10)
getAllAndCheck(t, db, []keyValVersion{
{"foo", "bar", 4, 0}, {"foo", "bar", 3, 0},
{"foo", "bar", 2, 0}, {"fooz", "baz", 3, 0},
})
cdef := compactDef{
thisLevel: db.lc.levels[0],
nextLevel: db.lc.levels[1],
top: db.lc.levels[0].tables,
bot: db.lc.levels[1].tables,
t: db.lc.levelTargets(),
}
cdef.t.baseLevel = 1
require.NoError(t, db.lc.runCompactDef(-1, 0, cdef))
// Only one version of every key should be left.
getAllAndCheck(t, db, []keyValVersion{{"foo", "bar", 4, 0}, {"fooz", "baz", 3, 0}})
})
})
}
// This is a test to ensure that the first entry with DiscardEarlierversion bit < DiscardTs
// is kept around (when numversionstokeep is infinite).
func TestDiscardFirstVersion(t *testing.T) {
opt := DefaultOptions("")
opt.NumCompactors = 0
opt.NumVersionsToKeep = math.MaxInt32
opt.managedTxns = true
runBadgerTest(t, &opt, func(t *testing.T, db *DB) {
l0 := []keyValVersion{{"foo", "bar", 1, 0}}
l01 := []keyValVersion{{"foo", "bar", 2, bitDiscardEarlierVersions}}
l02 := []keyValVersion{{"foo", "bar", 3, 0}}
l03 := []keyValVersion{{"foo", "bar", 4, 0}}
l04 := []keyValVersion{{"foo", "bar", 9, 0}}
l05 := []keyValVersion{{"foo", "bar", 10, bitDiscardEarlierVersions}}
// Level 0 has all the tables.
createAndOpen(db, l0, 0)
createAndOpen(db, l01, 0)
createAndOpen(db, l02, 0)
createAndOpen(db, l03, 0)
createAndOpen(db, l04, 0)
createAndOpen(db, l05, 0)
// Discard Time stamp is set to 7.
db.SetDiscardTs(7)
// Compact L0 to L1
cdef := compactDef{
thisLevel: db.lc.levels[0],
nextLevel: db.lc.levels[1],
top: db.lc.levels[0].tables,
bot: db.lc.levels[1].tables,
t: db.lc.levelTargets(),
}
cdef.t.baseLevel = 1
require.NoError(t, db.lc.runCompactDef(-1, 0, cdef))
// - Version 10, 9 lie above version 7 so they should be there.
// - Version 4, 3, 2 lie below the discardTs but they don't have the
// "bitDiscardEarlierVersions" versions set so they should not be removed because number
// of versions to keep is set to infinite.
// - Version 1 is below DiscardTS and below the first "bitDiscardEarlierVersions"
// marker so IT WILL BE REMOVED.
ExpectedKeys := []keyValVersion{
{"foo", "bar", 10, bitDiscardEarlierVersions},
{"foo", "bar", 9, 0},
{"foo", "bar", 4, 0},
{"foo", "bar", 3, 0},
{"foo", "bar", 2, bitDiscardEarlierVersions}}
getAllAndCheck(t, db, ExpectedKeys)
})
}
// This test ensures we don't stall when L1's size is greater than opt.LevelOneSize.
// We should stall only when L0 tables more than the opt.NumLevelZeroTableStall.
func TestL1Stall(t *testing.T) {
// TODO(ibrahim): Is this test still valid?
t.Skip()
opt := DefaultOptions("")
// Disable all compactions.
opt.NumCompactors = 0
// Number of level zero tables.
opt.NumLevelZeroTables = 3
// Addition of new tables will stall if there are 4 or more L0 tables.
opt.NumLevelZeroTablesStall = 4
// Level 1 size is 10 bytes.
opt.BaseLevelSize = 10
runBadgerTest(t, &opt, func(t *testing.T, db *DB) {
// Level 0 has 4 tables.
db.lc.levels[0].Lock()
db.lc.levels[0].tables = []*table.Table{createEmptyTable(db), createEmptyTable(db),
createEmptyTable(db), createEmptyTable(db)}
db.lc.levels[0].Unlock()
timeout := time.After(5 * time.Second)
done := make(chan bool)
// This is important. Set level 1 size more than the opt.LevelOneSize (we've set it to 10).
db.lc.levels[1].totalSize = 100
go func() {
tab := createEmptyTable(db)
require.NoError(t, db.lc.addLevel0Table(tab))
tab.DecrRef()
done <- true
}()
time.Sleep(time.Second)
db.lc.levels[0].Lock()
// Drop two tables from Level 0 so that addLevel0Table can make progress. Earlier table
// count was 4 which is equal to L0 stall count.
toDrop := db.lc.levels[0].tables[:2]
decrRefs(toDrop)
db.lc.levels[0].tables = db.lc.levels[0].tables[2:]
db.lc.levels[0].Unlock()
select {
case <-timeout:
t.Fatal("Test didn't finish in time")
case <-done:
}
})
}
func createEmptyTable(db *DB) *table.Table {
opts := table.Options{
BloomFalsePositive: db.opt.BloomFalsePositive,
ChkMode: options.NoVerification,
}
b := table.NewTableBuilder(opts)
defer b.Close()
// Add one key so that we can open this table.
b.Add(y.KeyWithTs([]byte("foo"), 1), y.ValueStruct{}, 0)
// Open table in memory to avoid adding changes to manifest file.
tab, err := table.OpenInMemoryTable(b.Finish(), db.lc.reserveFileID(), &opts)
if err != nil {
panic(err)
}
return tab
}
func TestL0Stall(t *testing.T) {
// TODO(ibrahim): Is this test still valid?
t.Skip()
opt := DefaultOptions("")
// Disable all compactions.
opt.NumCompactors = 0
// Number of level zero tables.
opt.NumLevelZeroTables = 3
// Addition of new tables will stall if there are 4 or more L0 tables.
opt.NumLevelZeroTablesStall = 4
runBadgerTest(t, &opt, func(t *testing.T, db *DB) {
db.lc.levels[0].Lock()
// Add NumLevelZeroTableStall+1 number of tables to level 0. This would fill up level
// zero and all new additions are expected to stall if L0 is in memory.
for i := 0; i < opt.NumLevelZeroTablesStall+1; i++ {
db.lc.levels[0].tables = append(db.lc.levels[0].tables, createEmptyTable(db))
}
db.lc.levels[0].Unlock()
timeout := time.After(5 * time.Second)
done := make(chan bool)
go func() {
tab := createEmptyTable(db)
require.NoError(t, db.lc.addLevel0Table(tab))
tab.DecrRef()
done <- true
}()
// Let it stall for a second.
time.Sleep(time.Second)
select {
case <-timeout:
t.Log("Timeout triggered")
// Mark this test as successful since L0 is in memory and the
// addition of new table to L0 is supposed to stall.
// Remove tables from level 0 so that the stalled
// compaction can make progress. This does not have any
// effect on the test. This is done so that the goroutine
// stuck on addLevel0Table can make progress and end.
db.lc.levels[0].Lock()
db.lc.levels[0].tables = nil
db.lc.levels[0].Unlock()
<-done
case <-done:
// The test completed before 5 second timeout. Mark it as successful.
t.Fatal("Test did not stall")
}
})
}
func TestLevelGet(t *testing.T) {
createLevel := func(db *DB, level int, data [][]keyValVersion) {
for _, v := range data {
createAndOpen(db, v, level)
}
}
type testData struct {
name string
// Keys on each level. keyValVersion[0] is the first table and so on.
levelData map[int][][]keyValVersion
expect []keyValVersion
}
test := func(t *testing.T, ti testData, db *DB) {
for level, data := range ti.levelData {
createLevel(db, level, data)
}
for _, item := range ti.expect {
key := y.KeyWithTs([]byte(item.key), uint64(item.version))
vs, err := db.get(key)
require.NoError(t, err)
require.Equal(t, item.val, string(vs.Value), "key:%s ver:%d", item.key, item.version)
}
}
tt := []testData{
{
"Normal",
map[int][][]keyValVersion{
0: { // Level 0 has 2 tables and each table has single key.
{{"foo", "bar10", 10, 0}},
{{"foo", "barSeven", 7, 0}},
},
1: { // Level 1 has 1 table with a single key.
{{"foo", "bar", 1, 0}},
},
},
[]keyValVersion{
{"foo", "bar", 1, 0},
{"foo", "barSeven", 7, 0},
{"foo", "bar10", 10, 0},
{"foo", "bar10", 11, 0}, // ver 11 doesn't exist so we should get bar10.
{"foo", "barSeven", 9, 0}, // ver 9 doesn't exist so we should get barSeven.
{"foo", "bar10", 100000, 0}, // ver doesn't exist so we should get bar10.
},
},
{"after gc",
map[int][][]keyValVersion{
0: { // Level 0 has 3 tables and each table has single key.
{{"foo", "barNew", 1, 0}}, // foo1 is above foo10 because of the GC.
{{"foo", "bar10", 10, 0}},
{{"foo", "barSeven", 7, 0}},
},
1: { // Level 1 has 1 table with a single key.
{{"foo", "bar", 1, 0}},
},
},
[]keyValVersion{
{"foo", "barNew", 1, 0},
{"foo", "barSeven", 7, 0},
{"foo", "bar10", 10, 0},
{"foo", "bar10", 11, 0}, // Should return biggest version.
},
},
{"after two gc",
map[int][][]keyValVersion{
0: { // Level 0 has 4 tables and each table has single key.
{{"foo", "barL0", 1, 0}}, // foo1 is above foo10 because of the GC.
{{"foo", "bar10", 10, 0}},
{{"foo", "barSeven", 7, 0}},
},
1: { // Level 1 has 1 table with a single key.
// Level 1 also has a foo because it was moved twice during GC.
{{"foo", "barL1", 1, 0}},
},
2: { // Level 1 has 1 table with a single key.
{{"foo", "bar", 1, 0}},
},
},
[]keyValVersion{
{"foo", "barL0", 1, 0},
{"foo", "barSeven", 7, 0},
{"foo", "bar10", 10, 0},
{"foo", "bar10", 11, 0}, // Should return biggest version.
},
},
}
for _, ti := range tt {
t.Run(ti.name, func(t *testing.T) {
runBadgerTest(t, nil, func(t *testing.T, db *DB) {
test(t, ti, db)
})
})
}
}
func TestKeyVersions(t *testing.T) {
inMemoryOpt := DefaultOptions("").
WithSyncWrites(false).
WithInMemory(true).
WithMemTableSize(4 << 20)
t.Run("disk", func(t *testing.T) {
t.Run("small table", func(t *testing.T) {
runBadgerTest(t, nil, func(t *testing.T, db *DB) {
l0 := make([]keyValVersion, 0)
for i := 0; i < 10; i++ {
l0 = append(l0, keyValVersion{fmt.Sprintf("%05d", i), "foo", 1, 0})
}
createAndOpen(db, l0, 0)
require.Equal(t, 1, len(db.KeySplits(nil)))
})
})
t.Run("medium table", func(t *testing.T) {
runBadgerTest(t, nil, func(t *testing.T, db *DB) {
l0 := make([]keyValVersion, 0)
for i := 0; i < 1000; i++ {
l0 = append(l0, keyValVersion{fmt.Sprintf("%05d", i), "foo", 1, 0})
}
createAndOpen(db, l0, 0)
require.Equal(t, 7, len(db.KeySplits(nil)))
})
})
t.Run("large table", func(t *testing.T) {