113 lines
3.0 KiB
Go
113 lines
3.0 KiB
Go
// Copyright 2018 The Prometheus Authors
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package tsdb
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import (
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"encoding/json"
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"io"
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"io/ioutil"
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"os"
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"path/filepath"
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"github.com/go-kit/kit/log"
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"github.com/go-kit/kit/log/level"
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"github.com/pkg/errors"
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)
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// repairBadIndexVersion repairs an issue in index and meta.json persistence introduced in
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// commit 129773b41a565fde5156301e37f9a87158030443.
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func repairBadIndexVersion(logger log.Logger, dir string) error {
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// All blocks written by Prometheus 2.1 with a meta.json version of 2 are affected.
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// We must actually set the index file version to 2 and revert the meta.json version back to 1.
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dirs, err := blockDirs(dir)
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if err != nil {
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return errors.Wrapf(err, "list block dirs in %q", dir)
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}
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wrapErr := func(err error, d string) error {
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return errors.Wrapf(err, "block dir: %q", d)
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}
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for _, d := range dirs {
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meta, err := readBogusMetaFile(d)
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if err != nil {
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return wrapErr(err, d)
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}
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if meta.Version == 1 {
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level.Info(logger).Log(
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"msg", "found healthy block",
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"mint", meta.MinTime,
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"maxt", meta.MaxTime,
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"ulid", meta.ULID,
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)
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continue
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}
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level.Info(logger).Log(
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"msg", "fixing broken block",
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"mint", meta.MinTime,
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"maxt", meta.MaxTime,
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"ulid", meta.ULID,
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)
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repl, err := os.Create(filepath.Join(d, "index.repaired"))
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if err != nil {
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return wrapErr(err, d)
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}
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broken, err := os.Open(filepath.Join(d, indexFilename))
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if err != nil {
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return wrapErr(err, d)
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}
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if _, err := io.Copy(repl, broken); err != nil {
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return wrapErr(err, d)
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}
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// Set the 5th byte to 2 to indicate the correct file format version.
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if _, err := repl.WriteAt([]byte{2}, 4); err != nil {
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return wrapErr(err, d)
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}
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if err := repl.Sync(); err != nil {
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return wrapErr(err, d)
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}
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if err := repl.Close(); err != nil {
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return wrapErr(err, d)
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}
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if err := broken.Close(); err != nil {
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return wrapErr(err, d)
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}
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if err := renameFile(repl.Name(), broken.Name()); err != nil {
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return wrapErr(err, d)
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}
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// Reset version of meta.json to 1.
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meta.Version = 1
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if err := writeMetaFile(d, meta); err != nil {
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return wrapErr(err, d)
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}
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}
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return nil
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}
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func readBogusMetaFile(dir string) (*BlockMeta, error) {
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b, err := ioutil.ReadFile(filepath.Join(dir, metaFilename))
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if err != nil {
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return nil, err
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}
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var m BlockMeta
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if err := json.Unmarshal(b, &m); err != nil {
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return nil, err
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}
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if m.Version != 1 && m.Version != 2 {
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return nil, errors.Errorf("unexpected meta file version %d", m.Version)
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}
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return &m, nil
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}
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