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discard_test.go
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discard_test.go
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/*
* Copyright 2020 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 (
"os"
"testing"
"github.com/stretchr/testify/require"
)
func TestDiscardStats(t *testing.T) {
dir, err := os.MkdirTemp("", "badger-test")
require.NoError(t, err)
defer removeDir(dir)
opt := DefaultOptions(dir)
ds, err := InitDiscardStats(opt)
require.NoError(t, err)
require.Zero(t, ds.nextEmptySlot)
fid, _ := ds.MaxDiscard()
require.Zero(t, fid)
for i := uint32(0); i < 20; i++ {
require.Equal(t, int64(i*100), ds.Update(i, int64(i*100)))
}
ds.Iterate(func(id, val uint64) {
require.Equal(t, id*100, val)
})
for i := uint32(0); i < 10; i++ {
require.Equal(t, 0, int(ds.Update(i, -1)))
}
ds.Iterate(func(id, val uint64) {
if id < 10 {
require.Zero(t, val)
return
}
require.Equal(t, int(id*100), int(val))
})
}
func TestReloadDiscardStats(t *testing.T) {
dir, err := os.MkdirTemp("", "badger-test")
require.NoError(t, err)
defer removeDir(dir)
opt := DefaultOptions(dir)
db, err := Open(opt)
require.NoError(t, err)
ds := db.vlog.discardStats
ds.Update(uint32(1), 1)
ds.Update(uint32(2), 1)
ds.Update(uint32(1), -1)
require.NoError(t, db.Close())
// Reopen the DB, discard stats should be same.
db2, err := Open(opt)
require.NoError(t, err)
ds2 := db2.vlog.discardStats
require.Zero(t, ds2.Update(uint32(1), 0))
require.Equal(t, 1, int(ds2.Update(uint32(2), 0)))
}