mirror of
https://github.com/minio/minio.git
synced 2024-12-26 23:25:54 -05:00
289 lines
8.2 KiB
Go
289 lines
8.2 KiB
Go
// Copyright (c) 2015-2021 MinIO, Inc.
|
|
//
|
|
// This file is part of MinIO Object Storage stack
|
|
//
|
|
// This program is free software: you can redistribute it and/or modify
|
|
// it under the terms of the GNU Affero General Public License as published by
|
|
// the Free Software Foundation, either version 3 of the License, or
|
|
// (at your option) any later version.
|
|
//
|
|
// This program is distributed in the hope that it will be useful
|
|
// but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
// GNU Affero General Public License for more details.
|
|
//
|
|
// You should have received a copy of the GNU Affero General Public License
|
|
// along with this program. If not, see <http://www.gnu.org/licenses/>.
|
|
|
|
package storageclass
|
|
|
|
import (
|
|
"encoding/json"
|
|
"fmt"
|
|
"strconv"
|
|
"strings"
|
|
"sync"
|
|
|
|
"github.com/minio/minio/internal/config"
|
|
"github.com/minio/pkg/env"
|
|
)
|
|
|
|
// Standard constants for all storage class
|
|
const (
|
|
// Reduced redundancy storage class
|
|
RRS = "REDUCED_REDUNDANCY"
|
|
// Standard storage class
|
|
STANDARD = "STANDARD"
|
|
)
|
|
|
|
// Standard constats for config info storage class
|
|
const (
|
|
ClassStandard = "standard"
|
|
ClassRRS = "rrs"
|
|
|
|
// Reduced redundancy storage class environment variable
|
|
RRSEnv = "MINIO_STORAGE_CLASS_RRS"
|
|
// Standard storage class environment variable
|
|
StandardEnv = "MINIO_STORAGE_CLASS_STANDARD"
|
|
|
|
// Supported storage class scheme is EC
|
|
schemePrefix = "EC"
|
|
|
|
// Min parity disks
|
|
minParityDisks = 2
|
|
|
|
// Default RRS parity is always minimum parity.
|
|
defaultRRSParity = minParityDisks
|
|
)
|
|
|
|
// DefaultKVS - default storage class config
|
|
var (
|
|
DefaultKVS = config.KVS{
|
|
config.KV{
|
|
Key: ClassStandard,
|
|
Value: "",
|
|
},
|
|
config.KV{
|
|
Key: ClassRRS,
|
|
Value: "EC:2",
|
|
},
|
|
}
|
|
)
|
|
|
|
// StorageClass - holds storage class information
|
|
type StorageClass struct {
|
|
Parity int
|
|
}
|
|
|
|
// ConfigLock is a global lock for storage-class config
|
|
var ConfigLock = sync.RWMutex{}
|
|
|
|
// Config storage class configuration
|
|
type Config struct {
|
|
Standard StorageClass `json:"standard"`
|
|
RRS StorageClass `json:"rrs"`
|
|
}
|
|
|
|
// UnmarshalJSON - Validate SS and RRS parity when unmarshalling JSON.
|
|
func (sCfg *Config) UnmarshalJSON(data []byte) error {
|
|
type Alias Config
|
|
aux := &struct {
|
|
*Alias
|
|
}{
|
|
Alias: (*Alias)(sCfg),
|
|
}
|
|
return json.Unmarshal(data, &aux)
|
|
}
|
|
|
|
// IsValid - returns true if input string is a valid
|
|
// storage class kind supported.
|
|
func IsValid(sc string) bool {
|
|
return sc == RRS || sc == STANDARD
|
|
}
|
|
|
|
// UnmarshalText unmarshals storage class from its textual form into
|
|
// storageClass structure.
|
|
func (sc *StorageClass) UnmarshalText(b []byte) error {
|
|
scStr := string(b)
|
|
if scStr == "" {
|
|
return nil
|
|
}
|
|
s, err := parseStorageClass(scStr)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
sc.Parity = s.Parity
|
|
return nil
|
|
}
|
|
|
|
// MarshalText - marshals storage class string.
|
|
func (sc *StorageClass) MarshalText() ([]byte, error) {
|
|
if sc.Parity != 0 {
|
|
return []byte(fmt.Sprintf("%s:%d", schemePrefix, sc.Parity)), nil
|
|
}
|
|
return []byte{}, nil
|
|
}
|
|
|
|
func (sc *StorageClass) String() string {
|
|
if sc.Parity != 0 {
|
|
return fmt.Sprintf("%s:%d", schemePrefix, sc.Parity)
|
|
}
|
|
return ""
|
|
}
|
|
|
|
// Parses given storageClassEnv and returns a storageClass structure.
|
|
// Supported Storage Class format is "Scheme:Number of parity disks".
|
|
// Currently only supported scheme is "EC".
|
|
func parseStorageClass(storageClassEnv string) (sc StorageClass, err error) {
|
|
s := strings.Split(storageClassEnv, ":")
|
|
|
|
// only two elements allowed in the string - "scheme" and "number of parity disks"
|
|
if len(s) > 2 {
|
|
return StorageClass{}, config.ErrStorageClassValue(nil).Msg("Too many sections in " + storageClassEnv)
|
|
} else if len(s) < 2 {
|
|
return StorageClass{}, config.ErrStorageClassValue(nil).Msg("Too few sections in " + storageClassEnv)
|
|
}
|
|
|
|
// only allowed scheme is "EC"
|
|
if s[0] != schemePrefix {
|
|
return StorageClass{}, config.ErrStorageClassValue(nil).Msg("Unsupported scheme " + s[0] + ". Supported scheme is EC")
|
|
}
|
|
|
|
// Number of parity disks should be integer
|
|
parityDisks, err := strconv.Atoi(s[1])
|
|
if err != nil {
|
|
return StorageClass{}, config.ErrStorageClassValue(err)
|
|
}
|
|
|
|
return StorageClass{
|
|
Parity: parityDisks,
|
|
}, nil
|
|
}
|
|
|
|
// ValidateParity validate standard storage class parity.
|
|
func ValidateParity(ssParity, setDriveCount int) error {
|
|
// SS parity disks should be greater than or equal to minParityDisks.
|
|
// Parity below minParityDisks is not supported.
|
|
if ssParity > 0 && ssParity < minParityDisks {
|
|
return fmt.Errorf("Standard storage class parity %d should be greater than or equal to %d",
|
|
ssParity, minParityDisks)
|
|
}
|
|
|
|
if ssParity > setDriveCount/2 {
|
|
return fmt.Errorf("Standard storage class parity %d should be less than or equal to %d", ssParity, setDriveCount/2)
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
// Validates the parity disks.
|
|
func validateParity(ssParity, rrsParity, setDriveCount int) (err error) {
|
|
// SS parity disks should be greater than or equal to minParityDisks.
|
|
// Parity below minParityDisks is not supported.
|
|
if ssParity > 0 && ssParity < minParityDisks {
|
|
return fmt.Errorf("Standard storage class parity %d should be greater than or equal to %d",
|
|
ssParity, minParityDisks)
|
|
}
|
|
|
|
// RRS parity disks should be greater than or equal to minParityDisks.
|
|
// Parity below minParityDisks is not supported.
|
|
if rrsParity > 0 && rrsParity < minParityDisks {
|
|
return fmt.Errorf("Reduced redundancy storage class parity %d should be greater than or equal to %d", rrsParity, minParityDisks)
|
|
}
|
|
|
|
if ssParity > setDriveCount/2 {
|
|
return fmt.Errorf("Standard storage class parity %d should be less than or equal to %d", ssParity, setDriveCount/2)
|
|
}
|
|
|
|
if rrsParity > setDriveCount/2 {
|
|
return fmt.Errorf("Reduced redundancy storage class parity %d should be less than or equal to %d", rrsParity, setDriveCount/2)
|
|
}
|
|
|
|
if ssParity > 0 && rrsParity > 0 {
|
|
if ssParity > 0 && ssParity < rrsParity {
|
|
return fmt.Errorf("Standard storage class parity disks %d should be greater than or equal to Reduced redundancy storage class parity disks %d", ssParity, rrsParity)
|
|
}
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// GetParityForSC - Returns the data and parity drive count based on storage class
|
|
// If storage class is set using the env vars MINIO_STORAGE_CLASS_RRS and
|
|
// MINIO_STORAGE_CLASS_STANDARD or server config fields corresponding values are
|
|
// returned.
|
|
//
|
|
// -- if input storage class is empty then standard is assumed
|
|
// -- if input is RRS but RRS is not configured default '2' parity
|
|
// for RRS is assumed
|
|
// -- if input is STANDARD but STANDARD is not configured '0' parity
|
|
// is returned, the caller is expected to choose the right parity
|
|
// at that point.
|
|
func (sCfg Config) GetParityForSC(sc string) (parity int) {
|
|
ConfigLock.RLock()
|
|
defer ConfigLock.RUnlock()
|
|
switch strings.TrimSpace(sc) {
|
|
case RRS:
|
|
// set the rrs parity if available
|
|
if sCfg.RRS.Parity == 0 {
|
|
return defaultRRSParity
|
|
}
|
|
return sCfg.RRS.Parity
|
|
default:
|
|
return sCfg.Standard.Parity
|
|
}
|
|
}
|
|
|
|
// Update update storage-class with new config
|
|
func (sCfg *Config) Update(newCfg Config) {
|
|
ConfigLock.Lock()
|
|
defer ConfigLock.Unlock()
|
|
sCfg.RRS = newCfg.RRS
|
|
sCfg.Standard = newCfg.Standard
|
|
}
|
|
|
|
// Enabled returns if etcd is enabled.
|
|
func Enabled(kvs config.KVS) bool {
|
|
ssc := kvs.Get(ClassStandard)
|
|
rrsc := kvs.Get(ClassRRS)
|
|
return ssc != "" || rrsc != ""
|
|
}
|
|
|
|
// LookupConfig - lookup storage class config and override with valid environment settings if any.
|
|
func LookupConfig(kvs config.KVS, setDriveCount int) (cfg Config, err error) {
|
|
cfg = Config{}
|
|
|
|
kvs.Delete("dma")
|
|
|
|
if err = config.CheckValidKeys(config.StorageClassSubSys, kvs, DefaultKVS); err != nil {
|
|
return Config{}, err
|
|
}
|
|
|
|
ssc := env.Get(StandardEnv, kvs.Get(ClassStandard))
|
|
rrsc := env.Get(RRSEnv, kvs.Get(ClassRRS))
|
|
// Check for environment variables and parse into storageClass struct
|
|
if ssc != "" {
|
|
cfg.Standard, err = parseStorageClass(ssc)
|
|
if err != nil {
|
|
return Config{}, err
|
|
}
|
|
}
|
|
|
|
if rrsc != "" {
|
|
cfg.RRS, err = parseStorageClass(rrsc)
|
|
if err != nil {
|
|
return Config{}, err
|
|
}
|
|
}
|
|
if cfg.RRS.Parity == 0 {
|
|
cfg.RRS.Parity = defaultRRSParity
|
|
}
|
|
|
|
// Validation is done after parsing both the storage classes. This is needed because we need one
|
|
// storage class value to deduce the correct value of the other storage class.
|
|
if err = validateParity(cfg.Standard.Parity, cfg.RRS.Parity, setDriveCount); err != nil {
|
|
return Config{}, err
|
|
}
|
|
|
|
return cfg, nil
|
|
}
|