mirror of
https://github.com/etcd-io/etcd.git
synced 2024-09-27 06:25:44 +00:00
e1fc545d8a
We need to return io.ErrUnexpectedEOF in the error chain, so that etcdserver can repair it automatically. Backport https://github.com/etcd-io/etcd/pull/15068 Signed-off-by: Benjamin Wang <wachao@vmware.com>
116 lines
3.2 KiB
Go
116 lines
3.2 KiB
Go
// Copyright 2015 The etcd 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 wal
|
|
|
|
import (
|
|
"errors"
|
|
"io"
|
|
"os"
|
|
"path/filepath"
|
|
"time"
|
|
|
|
"go.etcd.io/etcd/client/pkg/v3/fileutil"
|
|
"go.etcd.io/etcd/server/v3/wal/walpb"
|
|
"go.uber.org/zap"
|
|
)
|
|
|
|
// Repair tries to repair ErrUnexpectedEOF in the
|
|
// last wal file by truncating.
|
|
func Repair(lg *zap.Logger, dirpath string) bool {
|
|
if lg == nil {
|
|
lg = zap.NewNop()
|
|
}
|
|
f, err := openLast(lg, dirpath)
|
|
if err != nil {
|
|
return false
|
|
}
|
|
defer f.Close()
|
|
|
|
lg.Info("repairing", zap.String("path", f.Name()))
|
|
|
|
rec := &walpb.Record{}
|
|
decoder := newDecoder(fileutil.NewFileReader(f.File))
|
|
for {
|
|
lastOffset := decoder.lastOffset()
|
|
err := decoder.decode(rec)
|
|
switch {
|
|
case err == nil:
|
|
// update crc of the decoder when necessary
|
|
switch rec.Type {
|
|
case crcType:
|
|
crc := decoder.crc.Sum32()
|
|
// current crc of decoder must match the crc of the record.
|
|
// do no need to match 0 crc, since the decoder is a new one at this case.
|
|
if crc != 0 && rec.Validate(crc) != nil {
|
|
return false
|
|
}
|
|
decoder.updateCRC(rec.Crc)
|
|
}
|
|
continue
|
|
|
|
case errors.Is(err, io.EOF):
|
|
lg.Info("repaired", zap.String("path", f.Name()), zap.Error(io.EOF))
|
|
return true
|
|
|
|
case errors.Is(err, io.ErrUnexpectedEOF):
|
|
bf, bferr := os.Create(f.Name() + ".broken")
|
|
if bferr != nil {
|
|
lg.Warn("failed to create backup file", zap.String("path", f.Name()+".broken"), zap.Error(bferr))
|
|
return false
|
|
}
|
|
defer bf.Close()
|
|
|
|
if _, err = f.Seek(0, io.SeekStart); err != nil {
|
|
lg.Warn("failed to read file", zap.String("path", f.Name()), zap.Error(err))
|
|
return false
|
|
}
|
|
|
|
if _, err = io.Copy(bf, f); err != nil {
|
|
lg.Warn("failed to copy", zap.String("from", f.Name()+".broken"), zap.String("to", f.Name()), zap.Error(err))
|
|
return false
|
|
}
|
|
|
|
if err = f.Truncate(lastOffset); err != nil {
|
|
lg.Warn("failed to truncate", zap.String("path", f.Name()), zap.Error(err))
|
|
return false
|
|
}
|
|
|
|
start := time.Now()
|
|
if err = fileutil.Fsync(f.File); err != nil {
|
|
lg.Warn("failed to fsync", zap.String("path", f.Name()), zap.Error(err))
|
|
return false
|
|
}
|
|
walFsyncSec.Observe(time.Since(start).Seconds())
|
|
|
|
lg.Info("repaired", zap.String("path", f.Name()), zap.Error(io.ErrUnexpectedEOF))
|
|
return true
|
|
|
|
default:
|
|
lg.Warn("failed to repair", zap.String("path", f.Name()), zap.Error(err))
|
|
return false
|
|
}
|
|
}
|
|
}
|
|
|
|
// openLast opens the last wal file for read and write.
|
|
func openLast(lg *zap.Logger, dirpath string) (*fileutil.LockedFile, error) {
|
|
names, err := readWALNames(lg, dirpath)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
last := filepath.Join(dirpath, names[len(names)-1])
|
|
return fileutil.LockFile(last, os.O_RDWR, fileutil.PrivateFileMode)
|
|
}
|