prometheus/tsdb/repair_test.go

128 lines
3.6 KiB
Go

// Copyright 2018 The Prometheus Authors
// 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 tsdb
import (
"io/ioutil"
"os"
"path/filepath"
"testing"
"github.com/stretchr/testify/require"
"github.com/prometheus/prometheus/pkg/labels"
"github.com/prometheus/prometheus/tsdb/chunks"
"github.com/prometheus/prometheus/tsdb/fileutil"
"github.com/prometheus/prometheus/tsdb/index"
)
func TestRepairBadIndexVersion(t *testing.T) {
tmpDir, err := ioutil.TempDir("", "test")
require.NoError(t, err)
t.Cleanup(func() {
require.NoError(t, os.RemoveAll(tmpDir))
})
// The broken index used in this test was written by the following script
// at a broken revision.
//
// func main() {
// w, err := index.NewWriter(indexFilename)
// if err != nil {
// panic(err)
// }
// err = w.AddSymbols(map[string]struct{}{
// "a": struct{}{},
// "b": struct{}{},
// "1": struct{}{},
// "2": struct{}{},
// })
// if err != nil {
// panic(err)
// }
// err = w.AddSeries(1, labels.FromStrings("a", "1", "b", "1"))
// if err != nil {
// panic(err)
// }
// err = w.AddSeries(2, labels.FromStrings("a", "2", "b", "1"))
// if err != nil {
// panic(err)
// }
// err = w.WritePostings("b", "1", index.NewListPostings([]uint64{1, 2}))
// if err != nil {
// panic(err)
// }
// if err := w.Close(); err != nil {
// panic(err)
// }
// }
tmpDbDir := filepath.Join(tmpDir, "01BZJ9WJQPWHGNC2W4J9TA62KC")
// Create a copy DB to run test against.
require.NoError(t, fileutil.CopyDirs(filepath.Join("testdata", "repair_index_version", "01BZJ9WJQPWHGNC2W4J9TA62KC"), tmpDbDir))
// Check the current db.
// In its current state, lookups should fail with the fixed code.
_, _, err = readMetaFile(tmpDbDir)
require.Error(t, err)
// Touch chunks dir in block to imitate them.
require.NoError(t, os.MkdirAll(filepath.Join(tmpDbDir, "chunks"), 0777))
// Read current index to check integrity.
r, err := index.NewFileReader(filepath.Join(tmpDbDir, indexFilename))
require.NoError(t, err)
p, err := r.Postings("b", "1")
require.NoError(t, err)
for p.Next() {
t.Logf("next ID %d", p.At())
var lset labels.Labels
require.Error(t, r.Series(p.At(), &lset, nil))
}
require.NoError(t, p.Err())
require.NoError(t, r.Close())
// On DB opening all blocks in the base dir should be repaired.
db, err := Open(tmpDir, nil, nil, nil)
require.NoError(t, err)
db.Close()
r, err = index.NewFileReader(filepath.Join(tmpDbDir, indexFilename))
require.NoError(t, err)
defer r.Close()
p, err = r.Postings("b", "1")
require.NoError(t, err)
res := []labels.Labels{}
for p.Next() {
t.Logf("next ID %d", p.At())
var lset labels.Labels
var chks []chunks.Meta
require.NoError(t, r.Series(p.At(), &lset, &chks))
res = append(res, lset)
}
require.NoError(t, p.Err())
require.Equal(t, []labels.Labels{
{{Name: "a", Value: "1"}, {Name: "b", Value: "1"}},
{{Name: "a", Value: "2"}, {Name: "b", Value: "1"}},
}, res)
meta, _, err := readMetaFile(tmpDbDir)
require.NoError(t, err)
require.Equal(t, metaVersion1, meta.Version, "unexpected meta version %d", meta.Version)
}