mirror of
https://github.com/minio/minio.git
synced 2024-12-25 06:35:56 -05:00
327 lines
10 KiB
Go
327 lines
10 KiB
Go
/*
|
|
* 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 (
|
|
// NOTE: Values indicated here are based on manual testing and
|
|
// for best case scenarios under wide array of setups. If you
|
|
// encounter changes in future feel free to change these values.
|
|
|
|
// Attempt to retry only this many number of times before
|
|
// giving up on the remote disk entirely during initialization.
|
|
globalStorageInitRetryThreshold = 2
|
|
|
|
// Attempt to retry only this many number of times before
|
|
// giving up on the remote disk entirely after initialization.
|
|
globalStorageRetryThreshold = 1
|
|
|
|
// Interval to check health status of a node whether it has
|
|
// come back up online during initialization.
|
|
globalStorageInitHealthCheckInterval = 15 * time.Minute
|
|
|
|
// Interval to check health status of a node whether it has
|
|
// come back up online.
|
|
globalStorageHealthCheckInterval = 5 * time.Minute
|
|
)
|
|
|
|
// Converts rpc.ServerError to underlying error. This function is
|
|
// written so that the storageAPI errors are consistent across network
|
|
// disks as well.
|
|
func retryToStorageErr(err error) error {
|
|
if err == errDiskNotFoundFromNetError || err == errDiskNotFoundFromRPCShutdown {
|
|
return errDiskNotFound
|
|
}
|
|
return err
|
|
}
|
|
|
|
// Retry storage is an instance of StorageAPI which
|
|
// additionally verifies upon network shutdown if the
|
|
// underlying storage is available and is really
|
|
// formatted. After the initialization phase it will
|
|
// also cache when the underlying storage is offline
|
|
// to prevent needless calls and recheck the health of
|
|
// underlying storage in regular intervals.
|
|
type retryStorage struct {
|
|
remoteStorage StorageAPI
|
|
maxRetryAttempts int
|
|
retryInterval time.Duration
|
|
retryUnit time.Duration
|
|
retryCap time.Duration
|
|
offline bool // Mark whether node is offline
|
|
offlineTimestamp time.Time // Last timestamp of checking status of node
|
|
}
|
|
|
|
// String representation of remoteStorage.
|
|
func (f *retryStorage) String() string {
|
|
return f.remoteStorage.String()
|
|
}
|
|
|
|
// Reconnects to underlying remote storage.
|
|
func (f *retryStorage) Init() (err error) {
|
|
return retryToStorageErr(f.remoteStorage.Init())
|
|
}
|
|
|
|
// Closes the underlying remote storage connection.
|
|
func (f *retryStorage) Close() (err error) {
|
|
return retryToStorageErr(f.remoteStorage.Close())
|
|
}
|
|
|
|
// Return whether the underlying remote storage is offline
|
|
// and, if so, try to reconnect at regular intervals to
|
|
// restore the connection
|
|
func (f *retryStorage) IsOffline() bool {
|
|
// Check if offline and whether enough time has lapsed since most recent check
|
|
if f.offline && UTCNow().Sub(f.offlineTimestamp) >= f.retryInterval {
|
|
f.offlineTimestamp = UTCNow() // reset timestamp
|
|
|
|
if e := f.reInit(nil); e == nil {
|
|
// Connection has been re-established
|
|
f.offline = false // Mark node as back online
|
|
}
|
|
}
|
|
return f.offline
|
|
}
|
|
|
|
// DiskInfo - a retryable implementation of disk info.
|
|
func (f *retryStorage) DiskInfo() (info disk.Info, err error) {
|
|
if f.IsOffline() {
|
|
return info, errDiskNotFound
|
|
}
|
|
info, err = f.remoteStorage.DiskInfo()
|
|
if f.reInitUponDiskNotFound(err) {
|
|
info, err = f.remoteStorage.DiskInfo()
|
|
return info, retryToStorageErr(err)
|
|
}
|
|
return info, retryToStorageErr(err)
|
|
}
|
|
|
|
// MakeVol - a retryable implementation of creating a volume.
|
|
func (f *retryStorage) MakeVol(volume string) (err error) {
|
|
if f.IsOffline() {
|
|
return errDiskNotFound
|
|
}
|
|
err = f.remoteStorage.MakeVol(volume)
|
|
if f.reInitUponDiskNotFound(err) {
|
|
return retryToStorageErr(f.remoteStorage.MakeVol(volume))
|
|
}
|
|
return retryToStorageErr(err)
|
|
}
|
|
|
|
// ListVols - a retryable implementation of listing all the volumes.
|
|
func (f *retryStorage) ListVols() (vols []VolInfo, err error) {
|
|
if f.IsOffline() {
|
|
return vols, errDiskNotFound
|
|
}
|
|
vols, err = f.remoteStorage.ListVols()
|
|
if f.reInitUponDiskNotFound(err) {
|
|
vols, err = f.remoteStorage.ListVols()
|
|
return vols, retryToStorageErr(err)
|
|
}
|
|
return vols, retryToStorageErr(err)
|
|
}
|
|
|
|
// StatVol - a retryable implementation of stating a volume.
|
|
func (f *retryStorage) StatVol(volume string) (vol VolInfo, err error) {
|
|
if f.IsOffline() {
|
|
return vol, errDiskNotFound
|
|
}
|
|
vol, err = f.remoteStorage.StatVol(volume)
|
|
if f.reInitUponDiskNotFound(err) {
|
|
vol, err = f.remoteStorage.StatVol(volume)
|
|
return vol, retryToStorageErr(err)
|
|
}
|
|
return vol, retryToStorageErr(err)
|
|
}
|
|
|
|
// DeleteVol - a retryable implementation of deleting a volume.
|
|
func (f *retryStorage) DeleteVol(volume string) (err error) {
|
|
if f.IsOffline() {
|
|
return errDiskNotFound
|
|
}
|
|
err = f.remoteStorage.DeleteVol(volume)
|
|
if f.reInitUponDiskNotFound(err) {
|
|
return retryToStorageErr(f.remoteStorage.DeleteVol(volume))
|
|
}
|
|
return retryToStorageErr(err)
|
|
}
|
|
|
|
// PrepareFile - a retryable implementation of preparing a file.
|
|
func (f *retryStorage) PrepareFile(volume, path string, length int64) (err error) {
|
|
if f.IsOffline() {
|
|
return errDiskNotFound
|
|
}
|
|
err = f.remoteStorage.PrepareFile(volume, path, length)
|
|
if f.reInitUponDiskNotFound(err) {
|
|
return retryToStorageErr(f.remoteStorage.PrepareFile(volume, path, length))
|
|
}
|
|
return retryToStorageErr(err)
|
|
}
|
|
|
|
// AppendFile - a retryable implementation of append to a file.
|
|
func (f *retryStorage) AppendFile(volume, path string, buffer []byte) (err error) {
|
|
if f.IsOffline() {
|
|
return errDiskNotFound
|
|
}
|
|
err = f.remoteStorage.AppendFile(volume, path, buffer)
|
|
if f.reInitUponDiskNotFound(err) {
|
|
return retryToStorageErr(f.remoteStorage.AppendFile(volume, path, buffer))
|
|
}
|
|
return retryToStorageErr(err)
|
|
}
|
|
|
|
// StatFile - a retryable implementation of stating a file.
|
|
func (f *retryStorage) StatFile(volume, path string) (fileInfo FileInfo, err error) {
|
|
if f.IsOffline() {
|
|
return fileInfo, errDiskNotFound
|
|
}
|
|
fileInfo, err = f.remoteStorage.StatFile(volume, path)
|
|
if f.reInitUponDiskNotFound(err) {
|
|
fileInfo, err = f.remoteStorage.StatFile(volume, path)
|
|
return fileInfo, retryToStorageErr(err)
|
|
}
|
|
return fileInfo, retryToStorageErr(err)
|
|
}
|
|
|
|
// ReadAll - a retryable implementation of reading all the content from a file.
|
|
func (f *retryStorage) ReadAll(volume, path string) (buf []byte, err error) {
|
|
if f.IsOffline() {
|
|
return buf, errDiskNotFound
|
|
}
|
|
buf, err = f.remoteStorage.ReadAll(volume, path)
|
|
if f.reInitUponDiskNotFound(err) {
|
|
buf, err = f.remoteStorage.ReadAll(volume, path)
|
|
return buf, retryToStorageErr(err)
|
|
}
|
|
return buf, retryToStorageErr(err)
|
|
}
|
|
|
|
// ReadFile - a retryable implementation of reading at offset from a file.
|
|
func (f *retryStorage) ReadFile(volume, path string, offset int64, buffer []byte, verifier *BitrotVerifier) (m int64, err error) {
|
|
if f.IsOffline() {
|
|
return m, errDiskNotFound
|
|
}
|
|
m, err = f.remoteStorage.ReadFile(volume, path, offset, buffer, verifier)
|
|
if f.reInitUponDiskNotFound(err) {
|
|
m, err = f.remoteStorage.ReadFile(volume, path, offset, buffer, verifier)
|
|
return m, retryToStorageErr(err)
|
|
}
|
|
return m, retryToStorageErr(err)
|
|
}
|
|
|
|
// ListDir - a retryable implementation of listing directory entries.
|
|
func (f *retryStorage) ListDir(volume, path string) (entries []string, err error) {
|
|
if f.IsOffline() {
|
|
return entries, errDiskNotFound
|
|
}
|
|
entries, err = f.remoteStorage.ListDir(volume, path)
|
|
if f.reInitUponDiskNotFound(err) {
|
|
entries, err = f.remoteStorage.ListDir(volume, path)
|
|
return entries, retryToStorageErr(err)
|
|
}
|
|
return entries, retryToStorageErr(err)
|
|
}
|
|
|
|
// DeleteFile - a retryable implementation of deleting a file.
|
|
func (f *retryStorage) DeleteFile(volume, path string) (err error) {
|
|
if f.IsOffline() {
|
|
return errDiskNotFound
|
|
}
|
|
err = f.remoteStorage.DeleteFile(volume, path)
|
|
if f.reInitUponDiskNotFound(err) {
|
|
return retryToStorageErr(f.remoteStorage.DeleteFile(volume, path))
|
|
}
|
|
return retryToStorageErr(err)
|
|
}
|
|
|
|
// RenameFile - a retryable implementation of renaming a file.
|
|
func (f *retryStorage) RenameFile(srcVolume, srcPath, dstVolume, dstPath string) (err error) {
|
|
if f.IsOffline() {
|
|
return errDiskNotFound
|
|
}
|
|
err = f.remoteStorage.RenameFile(srcVolume, srcPath, dstVolume, dstPath)
|
|
if f.reInitUponDiskNotFound(err) {
|
|
return retryToStorageErr(f.remoteStorage.RenameFile(srcVolume, srcPath, dstVolume, dstPath))
|
|
}
|
|
return retryToStorageErr(err)
|
|
}
|
|
|
|
// Try to reinitialize the connection when we have some form of DiskNotFound error
|
|
func (f *retryStorage) reInitUponDiskNotFound(err error) bool {
|
|
if err == errDiskNotFound || err == errDiskNotFoundFromNetError || err == errDiskNotFoundFromRPCShutdown {
|
|
return f.reInit(err) == nil
|
|
}
|
|
return false
|
|
}
|
|
|
|
// Connect and attempt to load the format from a disconnected node.
|
|
// Additionally upon failure, we retry maxRetryAttempts times before
|
|
// giving up. Essentially as a whole it would mean we are infact
|
|
// performing 1 + maxRetryAttempts times reInit.
|
|
func (f *retryStorage) reInit(e error) (err error) {
|
|
// Check whether node has gone offline.
|
|
if UTCNow().Sub(f.offlineTimestamp) >= f.retryInterval {
|
|
if e == errDiskNotFoundFromNetError { // Make node offline due to network error
|
|
f.offline = true // Marking node offline
|
|
f.offlineTimestamp = UTCNow()
|
|
return errDiskNotFound
|
|
}
|
|
// Continue for other errors like RPC shutdown (and retry connection below)
|
|
}
|
|
|
|
// Close the underlying connection.
|
|
f.remoteStorage.Close() // Error here is purposefully ignored.
|
|
|
|
// Done channel is used to close any lingering retry routine, as soon
|
|
// as this function returns.
|
|
doneCh := make(chan struct{})
|
|
defer close(doneCh)
|
|
|
|
for i := range newRetryTimer(f.retryUnit, f.retryCap, 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.
|
|
if _, err = loadFormat(f.remoteStorage); 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
|
|
}
|