minio/cmd/retry-storage.go

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/*
* Minio Cloud Storage, (C) 2016 Minio, Inc.
*
* 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 cmd
import (
"time"
"github.com/minio/minio/pkg/disk"
)
const (
// Attempt to retry only this many number of times before
// giving up on the remote disk entirely during initialization.
globalStorageInitRetryThreshold = 4
// Attempt to retry only this many number of times before
// giving up on the remote disk entirely after initialization.
globalStorageRetryThreshold = 1
)
// Retry storage is an instance of StorageAPI which
// additionally verifies upon network shutdown if the
// underlying storage is available and is really
// formatted.
type retryStorage struct {
remoteStorage StorageAPI
maxRetryAttempts int
retryUnit time.Duration
retryCap time.Duration
}
// String representation of remoteStorage.
func (f retryStorage) String() string {
return f.remoteStorage.String()
}
// Reconncts to underlying remote storage.
func (f retryStorage) Init() (err error) {
return f.remoteStorage.Init()
}
// Closes the underlying remote storage connection.
func (f retryStorage) Close() (err error) {
return f.remoteStorage.Close()
}
// DiskInfo - a retryable implementation of disk info.
func (f retryStorage) DiskInfo() (info disk.Info, err error) {
info, err = f.remoteStorage.DiskInfo()
if err == errDiskNotFound {
err = f.reInit()
if err == nil {
return f.remoteStorage.DiskInfo()
}
}
return info, err
}
// MakeVol - a retryable implementation of creating a volume.
func (f retryStorage) MakeVol(volume string) (err error) {
err = f.remoteStorage.MakeVol(volume)
if err == errDiskNotFound {
err = f.reInit()
if err == nil {
return f.remoteStorage.MakeVol(volume)
}
}
return err
}
// ListVols - a retryable implementation of listing all the volumes.
func (f retryStorage) ListVols() (vols []VolInfo, err error) {
vols, err = f.remoteStorage.ListVols()
if err == errDiskNotFound {
err = f.reInit()
if err == nil {
return f.remoteStorage.ListVols()
}
}
return vols, err
}
// StatVol - a retryable implementation of stating a volume.
func (f retryStorage) StatVol(volume string) (vol VolInfo, err error) {
vol, err = f.remoteStorage.StatVol(volume)
if err == errDiskNotFound {
err = f.reInit()
if err == nil {
return f.remoteStorage.StatVol(volume)
}
}
return vol, err
}
// DeleteVol - a retryable implementation of deleting a volume.
func (f retryStorage) DeleteVol(volume string) (err error) {
err = f.remoteStorage.DeleteVol(volume)
if err == errDiskNotFound {
err = f.reInit()
if err == nil {
return f.remoteStorage.DeleteVol(volume)
}
}
return err
}
// PrepareFile - a retryable implementation of preparing a file.
func (f retryStorage) PrepareFile(volume, path string, length int64) (err error) {
err = f.remoteStorage.PrepareFile(volume, path, length)
if err == errDiskNotFound {
err = f.reInit()
if err == nil {
return f.remoteStorage.PrepareFile(volume, path, length)
}
}
return err
}
// AppendFile - a retryable implementation of append to a file.
func (f retryStorage) AppendFile(volume, path string, buffer []byte) (err error) {
err = f.remoteStorage.AppendFile(volume, path, buffer)
if err == errDiskNotFound {
err = f.reInit()
if err == nil {
return f.remoteStorage.AppendFile(volume, path, buffer)
}
}
return err
}
// StatFile - a retryable implementation of stating a file.
func (f retryStorage) StatFile(volume, path string) (fileInfo FileInfo, err error) {
fileInfo, err = f.remoteStorage.StatFile(volume, path)
if err == errDiskNotFound {
err = f.reInit()
if err == nil {
return f.remoteStorage.StatFile(volume, path)
}
}
return fileInfo, err
}
// ReadAll - a retryable implementation of reading all the content from a file.
func (f retryStorage) ReadAll(volume, path string) (buf []byte, err error) {
buf, err = f.remoteStorage.ReadAll(volume, path)
if err == errDiskNotFound {
err = f.reInit()
if err == nil {
return f.remoteStorage.ReadAll(volume, path)
}
}
return buf, err
}
// ReadFile - a retryable implementation of reading at offset from a file.
func (f retryStorage) ReadFile(volume, path string, offset int64, buffer []byte) (m int64, err error) {
m, err = f.remoteStorage.ReadFile(volume, path, offset, buffer)
if err == errDiskNotFound {
err = f.reInit()
if err == nil {
return f.remoteStorage.ReadFile(volume, path, offset, buffer)
}
}
return m, err
}
// ListDir - a retryable implementation of listing directory entries.
func (f retryStorage) ListDir(volume, path string) (entries []string, err error) {
entries, err = f.remoteStorage.ListDir(volume, path)
if err == errDiskNotFound {
err = f.reInit()
if err == nil {
return f.remoteStorage.ListDir(volume, path)
}
}
return entries, err
}
// DeleteFile - a retryable implementation of deleting a file.
func (f retryStorage) DeleteFile(volume, path string) (err error) {
err = f.remoteStorage.DeleteFile(volume, path)
if err == errDiskNotFound {
err = f.reInit()
if err == nil {
return f.remoteStorage.DeleteFile(volume, path)
}
}
return err
}
// RenameFile - a retryable implementation of renaming a file.
func (f retryStorage) RenameFile(srcVolume, srcPath, dstVolume, dstPath string) (err error) {
err = f.remoteStorage.RenameFile(srcVolume, srcPath, dstVolume, dstPath)
if err == errDiskNotFound {
err = f.reInit()
if err == nil {
return f.remoteStorage.RenameFile(srcVolume, srcPath, dstVolume, dstPath)
}
}
return err
}
// Connect and attempt to load the format from a disconnected node,
// attempts three times before giving up.
func (f retryStorage) reInit() (err error) {
// Close the underlying connection.
f.remoteStorage.Close() // Error here is purposefully ignored.
doneCh := make(chan struct{})
defer close(doneCh)
for i := range newRetryTimer(f.retryUnit, f.retryCap, MaxJitter, doneCh) {
// Initialize and make a new login attempt.
err = f.remoteStorage.Init()
if err != nil {
// No need to return error until the retry count
// threshold has reached.
if i < f.maxRetryAttempts {
continue
}
return err
}
// Attempt to load format to see if the disk is really
// a formatted disk and part of the cluster.
_, err = loadFormat(f.remoteStorage)
if err != nil {
// No need to return error until the retry count
// threshold has reached.
if i < f.maxRetryAttempts {
continue
}
return err
}
// Login and loading format was a success, break and proceed forward.
break
}
return err
}