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minio/cmd/format-erasure.go

939 lines
29 KiB

/*
* MinIO Cloud Storage, (C) 2016, 2017, 2018 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 (
"context"
"encoding/hex"
"encoding/json"
"errors"
"fmt"
"io/ioutil"
"reflect"
"sync"
humanize "github.com/dustin/go-humanize"
"github.com/minio/minio/cmd/config/storageclass"
"github.com/minio/minio/cmd/logger"
"github.com/minio/minio/pkg/color"
"github.com/minio/minio/pkg/sync/errgroup"
sha256 "github.com/minio/sha256-simd"
)
const (
// Represents Erasure backend.
formatBackendErasure = "xl"
// formatErasureV1.Erasure.Version - version '1'.
formatErasureVersionV1 = "1"
// formatErasureV2.Erasure.Version - version '2'.
formatErasureVersionV2 = "2"
// formatErasureV3.Erasure.Version - version '3'.
formatErasureVersionV3 = "3"
// Distribution algorithm used, legacy
formatErasureVersionV2DistributionAlgoLegacy = "CRCMOD"
// Distributed algorithm used, current
formatErasureVersionV3DistributionAlgo = "SIPMOD"
)
// Offline disk UUID represents an offline disk.
const offlineDiskUUID = "ffffffff-ffff-ffff-ffff-ffffffffffff"
// Used to detect the version of "xl" format.
type formatErasureVersionDetect struct {
Erasure struct {
Version string `json:"version"`
} `json:"xl"`
}
// Represents the V1 backend disk structure version
// under `.minio.sys` and actual data namespace.
// formatErasureV1 - structure holds format config version '1'.
type formatErasureV1 struct {
formatMetaV1
Erasure struct {
Version string `json:"version"` // Version of 'xl' format.
Disk string `json:"disk"` // Disk field carries assigned disk uuid.
// JBOD field carries the input disk order generated the first
// time when fresh disks were supplied.
JBOD []string `json:"jbod"`
} `json:"xl"` // Erasure field holds xl format.
}
// Represents the V2 backend disk structure version
// under `.minio.sys` and actual data namespace.
// formatErasureV2 - structure holds format config version '2'.
// The V2 format to support "large bucket" support where a bucket
// can span multiple erasure sets.
type formatErasureV2 struct {
formatMetaV1
Erasure struct {
Version string `json:"version"` // Version of 'xl' format.
This string `json:"this"` // This field carries assigned disk uuid.
// Sets field carries the input disk order generated the first
// time when fresh disks were supplied, it is a two dimensional
// array second dimension represents list of disks used per set.
Sets [][]string `json:"sets"`
// Distribution algorithm represents the hashing algorithm
// to pick the right set index for an object.
DistributionAlgo string `json:"distributionAlgo"`
} `json:"xl"`
}
// formatErasureV3 struct is same as formatErasureV2 struct except that formatErasureV3.Erasure.Version is "3" indicating
// the simplified multipart backend which is a flat hierarchy now.
// In .minio.sys/multipart we have:
// sha256(bucket/object)/uploadID/[xl.meta, part.1, part.2 ....]
type formatErasureV3 struct {
formatMetaV1
Erasure struct {
Version string `json:"version"` // Version of 'xl' format.
This string `json:"this"` // This field carries assigned disk uuid.
// Sets field carries the input disk order generated the first
// time when fresh disks were supplied, it is a two dimensional
// array second dimension represents list of disks used per set.
Sets [][]string `json:"sets"`
// Distribution algorithm represents the hashing algorithm
// to pick the right set index for an object.
DistributionAlgo string `json:"distributionAlgo"`
} `json:"xl"`
}
func (f *formatErasureV3) Clone() *formatErasureV3 {
b, err := json.Marshal(f)
if err != nil {
panic(err)
}
var dst formatErasureV3
if err = json.Unmarshal(b, &dst); err != nil {
panic(err)
}
return &dst
}
// Returns formatErasure.Erasure.Version
func newFormatErasureV3(numSets int, setLen int, distributionAlgo string) *formatErasureV3 {
format := &formatErasureV3{}
format.Version = formatMetaVersionV1
format.Format = formatBackendErasure
format.ID = mustGetUUID()
format.Erasure.Version = formatErasureVersionV3
if distributionAlgo == "" {
format.Erasure.DistributionAlgo = formatErasureVersionV3DistributionAlgo
} else {
format.Erasure.DistributionAlgo = distributionAlgo
}
format.Erasure.Sets = make([][]string, numSets)
for i := 0; i < numSets; i++ {
format.Erasure.Sets[i] = make([]string, setLen)
for j := 0; j < setLen; j++ {
format.Erasure.Sets[i][j] = mustGetUUID()
}
}
return format
}
// Returns format Erasure version after reading `format.json`, returns
// successfully the version only if the backend is Erasure.
func formatGetBackendErasureVersion(formatPath string) (string, error) {
meta := &formatMetaV1{}
b, err := ioutil.ReadFile(formatPath)
if err != nil {
return "", err
}
if err = json.Unmarshal(b, meta); err != nil {
return "", err
}
if meta.Version != formatMetaVersionV1 {
return "", fmt.Errorf(`format.Version expected: %s, got: %s`, formatMetaVersionV1, meta.Version)
}
if meta.Format != formatBackendErasure {
return "", fmt.Errorf(`found backend %s, expected %s`, meta.Format, formatBackendErasure)
}
// Erasure backend found, proceed to detect version.
format := &formatErasureVersionDetect{}
if err = json.Unmarshal(b, format); err != nil {
return "", err
}
return format.Erasure.Version, nil
}
// Migrates all previous versions to latest version of `format.json`,
// this code calls migration in sequence, such as V1 is migrated to V2
// first before it V2 migrates to V3.
func formatErasureMigrate(export string) error {
formatPath := pathJoin(export, minioMetaBucket, formatConfigFile)
version, err := formatGetBackendErasureVersion(formatPath)
if err != nil {
return err
}
switch version {
case formatErasureVersionV1:
if err = formatErasureMigrateV1ToV2(export, version); err != nil {
return err
}
// Migrate successful v1 => v2, proceed to v2 => v3
version = formatErasureVersionV2
fallthrough
case formatErasureVersionV2:
if err = formatErasureMigrateV2ToV3(export, version); err != nil {
return err
}
// Migrate successful v2 => v3, v3 is latest
// version = formatXLVersionV3
fallthrough
case formatErasureVersionV3:
// v3 is the latest version, return.
return nil
}
return fmt.Errorf(`%s: unknown format version %s`, export, version)
}
// Migrates version V1 of format.json to version V2 of format.json,
// migration fails upon any error.
func formatErasureMigrateV1ToV2(export, version string) error {
if version != formatErasureVersionV1 {
return fmt.Errorf(`Disk %s: format version expected %s, found %s`, export, formatErasureVersionV1, version)
}
formatPath := pathJoin(export, minioMetaBucket, formatConfigFile)
formatV1 := &formatErasureV1{}
b, err := ioutil.ReadFile(formatPath)
if err != nil {
return err
}
if err = json.Unmarshal(b, formatV1); err != nil {
return err
}
formatV2 := &formatErasureV2{}
formatV2.Version = formatMetaVersionV1
formatV2.Format = formatBackendErasure
formatV2.Erasure.Version = formatErasureVersionV2
formatV2.Erasure.DistributionAlgo = formatErasureVersionV2DistributionAlgoLegacy
formatV2.Erasure.This = formatV1.Erasure.Disk
formatV2.Erasure.Sets = make([][]string, 1)
formatV2.Erasure.Sets[0] = make([]string, len(formatV1.Erasure.JBOD))
copy(formatV2.Erasure.Sets[0], formatV1.Erasure.JBOD)
b, err = json.Marshal(formatV2)
if err != nil {
return err
}
return ioutil.WriteFile(formatPath, b, 0644)
}
// Migrates V2 for format.json to V3 (Flat hierarchy for multipart)
func formatErasureMigrateV2ToV3(export, version string) error {
if version != formatErasureVersionV2 {
return fmt.Errorf(`Disk %s: format version expected %s, found %s`, export, formatErasureVersionV2, version)
}
formatPath := pathJoin(export, minioMetaBucket, formatConfigFile)
formatV2 := &formatErasureV2{}
b, err := ioutil.ReadFile(formatPath)
if err != nil {
return err
}
err = json.Unmarshal(b, formatV2)
if err != nil {
return err
}
if err = removeAll(pathJoin(export, minioMetaMultipartBucket)); err != nil {
return err
}
if err = mkdirAll(pathJoin(export, minioMetaMultipartBucket), 0755); err != nil {
return err
}
// format-V2 struct is exactly same as format-V1 except that version is "3"
// which indicates the simplified multipart backend.
formatV3 := formatErasureV3{}
formatV3.Version = formatV2.Version
formatV3.Format = formatV2.Format
formatV3.Erasure = formatV2.Erasure
formatV3.Erasure.Version = formatErasureVersionV3
b, err = json.Marshal(formatV3)
if err != nil {
return err
}
return ioutil.WriteFile(formatPath, b, 0644)
}
// countErrs - count a specific error.
func countErrs(errs []error, err error) int {
var i = 0
for _, err1 := range errs {
if err1 == err {
i++
}
}
return i
}
// Does all errors indicate we need to initialize all disks?.
func shouldInitErasureDisks(errs []error) bool {
return countErrs(errs, errUnformattedDisk) == len(errs)
}
// Check if unformatted disks are equal to write quorum.
func quorumUnformattedDisks(errs []error) bool {
return countErrs(errs, errUnformattedDisk) >= (len(errs)/2)+1
}
// loadFormatErasureAll - load all format config from all input disks in parallel.
func loadFormatErasureAll(storageDisks []StorageAPI, heal bool) ([]*formatErasureV3, []error) {
// Initialize list of errors.
g := errgroup.WithNErrs(len(storageDisks))
// Initialize format configs.
var formats = make([]*formatErasureV3, len(storageDisks))
// Load format from each disk in parallel
for index := range storageDisks {
index := index
g.Go(func() error {
if storageDisks[index] == nil {
return errDiskNotFound
}
format, err := loadFormatErasure(storageDisks[index])
if err != nil {
return err
}
formats[index] = format
if !heal {
// If no healing required, make the disks valid and
// online.
storageDisks[index].SetDiskID(format.Erasure.This)
}
return nil
}, index)
}
// Return all formats and errors if any.
return formats, g.Wait()
}
func saveHealingTracker(disk StorageAPI, diskID string) error {
htracker := healingTracker{
ID: diskID,
}
htrackerBytes, err := htracker.MarshalMsg(nil)
if err != nil {
return err
}
return disk.WriteAll(context.TODO(), minioMetaBucket,
pathJoin(bucketMetaPrefix, slashSeparator, healingTrackerFilename),
htrackerBytes)
}
func saveFormatErasure(disk StorageAPI, format *formatErasureV3, heal bool) error {
if disk == nil || format == nil {
return errDiskNotFound
}
diskID := format.Erasure.This
if err := makeFormatErasureMetaVolumes(disk); err != nil {
return err
}
// Marshal and write to disk.
formatBytes, err := json.Marshal(format)
if err != nil {
return err
}
tmpFormat := mustGetUUID()
// Purge any existing temporary file, okay to ignore errors here.
defer disk.Delete(context.TODO(), minioMetaBucket, tmpFormat, false)
// write to unique file.
if err = disk.WriteAll(context.TODO(), minioMetaBucket, tmpFormat, formatBytes); err != nil {
return err
}
// Rename file `uuid.json` --> `format.json`.
if err = disk.RenameFile(context.TODO(), minioMetaBucket, tmpFormat, minioMetaBucket, formatConfigFile); err != nil {
return err
}
disk.SetDiskID(diskID)
if heal {
return saveHealingTracker(disk, diskID)
}
return nil
}
var ignoredHiddenDirectories = map[string]struct{}{
minioMetaBucket: {}, // metabucket '.minio.sys'
".minio": {}, // users may choose to double down the backend as the config folder for certs
".snapshot": {}, // .snapshot for ignoring NetApp based persistent volumes WAFL snapshot
"lost+found": {}, // 'lost+found' directory default on ext4 filesystems
"$RECYCLE.BIN": {}, // windows specific directory for each drive (hidden)
"System Volume Information": {}, // windows specific directory for each drive (hidden)
}
func isHiddenDirectories(vols ...VolInfo) bool {
for _, vol := range vols {
if _, ok := ignoredHiddenDirectories[vol.Name]; ok {
continue
}
return false
}
return true
}
// loadFormatErasure - loads format.json from disk.
func loadFormatErasure(disk StorageAPI) (format *formatErasureV3, err error) {
buf, err := disk.ReadAll(context.TODO(), minioMetaBucket, formatConfigFile)
if err != nil {
// 'file not found' and 'volume not found' as
// same. 'volume not found' usually means its a fresh disk.
if err == errFileNotFound || err == errVolumeNotFound {
var vols []VolInfo
vols, err = disk.ListVols(context.TODO())
if err != nil {
return nil, err
}
if !isHiddenDirectories(vols...) {
// 'format.json' not found, but we found user data, reject such disks.
return nil, fmt.Errorf("some unexpected files '%v' found on %s: %w",
vols, disk, errCorruptedFormat)
}
// No other data found, its a fresh disk.
return nil, errUnformattedDisk
}
return nil, err
}
// Try to decode format json into formatConfigV1 struct.
format = &formatErasureV3{}
if err = json.Unmarshal(buf, format); err != nil {
return nil, err
}
// Success.
return format, nil
}
// Valid formatErasure basic versions.
func checkFormatErasureValue(formatErasure *formatErasureV3) error {
// Validate format version and format type.
if formatErasure.Version != formatMetaVersionV1 {
return fmt.Errorf("Unsupported version of backend format [%s] found", formatErasure.Version)
}
if formatErasure.Format != formatBackendErasure {
return fmt.Errorf("Unsupported backend format [%s] found", formatErasure.Format)
}
if formatErasure.Erasure.Version != formatErasureVersionV3 {
return fmt.Errorf("Unsupported Erasure backend format found [%s]", formatErasure.Erasure.Version)
}
return nil
}
// Check all format values.
func checkFormatErasureValues(formats []*formatErasureV3, setDriveCount int) error {
for i, formatErasure := range formats {
if formatErasure == nil {
continue
}
if err := checkFormatErasureValue(formatErasure); err != nil {
return err
}
if len(formats) != len(formatErasure.Erasure.Sets)*len(formatErasure.Erasure.Sets[0]) {
return fmt.Errorf("%s disk is already being used in another erasure deployment. (Number of disks specified: %d but the number of disks found in the %s disk's format.json: %d)",
humanize.Ordinal(i+1), len(formats), humanize.Ordinal(i+1), len(formatErasure.Erasure.Sets)*len(formatErasure.Erasure.Sets[0]))
}
// Only if custom erasure drive count is set,
// we should fail here other proceed to honor what
// is present on the disk.
if globalCustomErasureDriveCount && len(formatErasure.Erasure.Sets[0]) != setDriveCount {
return fmt.Errorf("%s disk is already formatted with %d drives per erasure set. This cannot be changed to %d, please revert your MINIO_ERASURE_SET_DRIVE_COUNT setting", humanize.Ordinal(i+1), len(formatErasure.Erasure.Sets[0]), setDriveCount)
}
}
return nil
}
// Get Deployment ID for the Erasure sets from format.json.
// This need not be in quorum. Even if one of the format.json
// file has this value, we assume it is valid.
// If more than one format.json's have different id, it is considered a corrupt
// backend format.
func formatErasureGetDeploymentID(refFormat *formatErasureV3, formats []*formatErasureV3) (string, error) {
var deploymentID string
for _, format := range formats {
if format == nil || format.ID == "" {
continue
}
if reflect.DeepEqual(format.Erasure.Sets, refFormat.Erasure.Sets) {
// Found an ID in one of the format.json file
// Set deploymentID for the first time.
if deploymentID == "" {
deploymentID = format.ID
} else if deploymentID != format.ID {
// DeploymentID found earlier doesn't match with the
// current format.json's ID.
return "", fmt.Errorf("Deployment IDs do not match expected %s, got %s: %w",
deploymentID, format.ID, errCorruptedFormat)
}
}
}
return deploymentID, nil
}
// formatErasureFixDeploymentID - Add deployment id if it is not present.
func formatErasureFixDeploymentID(endpoints Endpoints, storageDisks []StorageAPI, refFormat *formatErasureV3) (err error) {
// Attempt to load all `format.json` from all disks.
formats, _ := loadFormatErasureAll(storageDisks, false)
for index := range formats {
// If the Erasure sets do not match, set those formats to nil,
// We do not have to update the ID on those format.json file.
if formats[index] != nil && !reflect.DeepEqual(formats[index].Erasure.Sets, refFormat.Erasure.Sets) {
formats[index] = nil
}
}
refFormat.ID, err = formatErasureGetDeploymentID(refFormat, formats)
if err != nil {
return err
}
// If ID is set, then some other node got the lock
// before this node could and generated an ID
// for the deployment. No need to generate one.
if refFormat.ID != "" {
return nil
}
// ID is generated for the first time,
// We set the ID in all the formats and update.
refFormat.ID = mustGetUUID()
for _, format := range formats {
if format != nil {
format.ID = refFormat.ID
}
}
// Deployment ID needs to be set on all the disks.
// Save `format.json` across all disks.
return saveFormatErasureAll(GlobalContext, storageDisks, formats)
}
// Update only the valid local disks which have not been updated before.
func formatErasureFixLocalDeploymentID(endpoints Endpoints, storageDisks []StorageAPI, refFormat *formatErasureV3) error {
// If this server was down when the deploymentID was updated
// then we make sure that we update the local disks with the deploymentID.
// Initialize errs to collect errors inside go-routine.
g := errgroup.WithNErrs(len(storageDisks))
for index := range storageDisks {
index := index
g.Go(func() error {
if endpoints[index].IsLocal && storageDisks[index] != nil && storageDisks[index].IsOnline() {
format, err := loadFormatErasure(storageDisks[index])
if err != nil {
// Disk can be offline etc.
// ignore the errors seen here.
return nil
}
if format.ID != "" {
return nil
}
if !reflect.DeepEqual(format.Erasure.Sets, refFormat.Erasure.Sets) {
return nil
}
format.ID = refFormat.ID
// Heal the drive if we fixed its deployment ID.
if err := saveFormatErasure(storageDisks[index], format, true); err != nil {
logger.LogIf(GlobalContext, err)
return fmt.Errorf("Unable to save format.json, %w", err)
}
}
return nil
}, index)
}
for _, err := range g.Wait() {
if err != nil {
return err
}
}
return nil
}
// Get backend Erasure format in quorum `format.json`.
func getFormatErasureInQuorum(formats []*formatErasureV3) (*formatErasureV3, error) {
formatHashes := make([]string, len(formats))
for i, format := range formats {
if format == nil {
continue
}
h := sha256.New()
for _, set := range format.Erasure.Sets {
for _, diskID := range set {
h.Write([]byte(diskID))
}
}
formatHashes[i] = hex.EncodeToString(h.Sum(nil))
}
formatCountMap := make(map[string]int)
for _, hash := range formatHashes {
if hash == "" {
continue
}
formatCountMap[hash]++
}
maxHash := ""
maxCount := 0
for hash, count := range formatCountMap {
if count > maxCount {
maxCount = count
maxHash = hash
}
}
if maxCount < len(formats)/2 {
return nil, errErasureReadQuorum
}
for i, hash := range formatHashes {
if hash == maxHash {
format := formats[i].Clone()
format.Erasure.This = ""
return format, nil
}
}
return nil, errErasureReadQuorum
}
func formatErasureV3Check(reference *formatErasureV3, format *formatErasureV3) error {
tmpFormat := format.Clone()
this := tmpFormat.Erasure.This
tmpFormat.Erasure.This = ""
if len(reference.Erasure.Sets) != len(format.Erasure.Sets) {
return fmt.Errorf("Expected number of sets %d, got %d", len(reference.Erasure.Sets), len(format.Erasure.Sets))
}
// Make sure that the sets match.
for i := range reference.Erasure.Sets {
if len(reference.Erasure.Sets[i]) != len(format.Erasure.Sets[i]) {
return fmt.Errorf("Each set should be of same size, expected %d got %d",
len(reference.Erasure.Sets[i]), len(format.Erasure.Sets[i]))
}
for j := range reference.Erasure.Sets[i] {
if reference.Erasure.Sets[i][j] != format.Erasure.Sets[i][j] {
return fmt.Errorf("UUID on positions %d:%d do not match with, expected %s got %s: (%w)",
i, j, reference.Erasure.Sets[i][j], format.Erasure.Sets[i][j], errInconsistentDisk)
}
}
}
// Make sure that the diskID is found in the set.
for i := 0; i < len(tmpFormat.Erasure.Sets); i++ {
for j := 0; j < len(tmpFormat.Erasure.Sets[i]); j++ {
if this == tmpFormat.Erasure.Sets[i][j] {
return nil
}
}
}
return fmt.Errorf("Disk ID %s not found in any disk sets %s", this, format.Erasure.Sets)
}
// Initializes meta volume only on local storage disks.
func initErasureMetaVolumesInLocalDisks(storageDisks []StorageAPI, formats []*formatErasureV3) error {
// Compute the local disks eligible for meta volumes (re)initialization
var disksToInit []StorageAPI
for index := range storageDisks {
if formats[index] == nil || storageDisks[index] == nil || !storageDisks[index].IsLocal() {
// Ignore create meta volume on disks which are not found or not local.
continue
}
disksToInit = append(disksToInit, storageDisks[index])
}
// Initialize errs to collect errors inside go-routine.
g := errgroup.WithNErrs(len(disksToInit))
// Initialize all disks in parallel.
for index := range disksToInit {
// Initialize a new index variable in each loop so each
// goroutine will return its own instance of index variable.
index := index
g.Go(func() error {
return makeFormatErasureMetaVolumes(disksToInit[index])
}, index)
}
// Return upon first error.
for _, err := range g.Wait() {
if err == nil {
continue
}
return toObjectErr(err, minioMetaBucket)
}
// Return success here.
return nil
}
// saveUnformattedFormat - populates `format.json` on unformatted disks.
// also adds `.healing.bin` on the disks which are being actively healed.
func saveUnformattedFormat(ctx context.Context, storageDisks []StorageAPI, formats []*formatErasureV3) error {
for index, format := range formats {
if format == nil {
continue
}
if err := saveFormatErasure(storageDisks[index], format, true); err != nil {
return err
}
}
return nil
}
// saveFormatErasureAll - populates `format.json` on disks in its order.
func saveFormatErasureAll(ctx context.Context, storageDisks []StorageAPI, formats []*formatErasureV3) error {
g := errgroup.WithNErrs(len(storageDisks))
// Write `format.json` to all disks.
for index := range storageDisks {
index := index
g.Go(func() error {
if formats[index] == nil {
return errDiskNotFound
}
return saveFormatErasure(storageDisks[index], formats[index], false)
}, index)
}
writeQuorum := getWriteQuorum(len(storageDisks))
// Wait for the routines to finish.
return reduceWriteQuorumErrs(ctx, g.Wait(), nil, writeQuorum)
}
// relinquishes the underlying connection for all storage disks.
func closeStorageDisks(storageDisks []StorageAPI) {
for _, disk := range storageDisks {
if disk == nil {
continue
}
disk.Close()
}
}
func initStorageDisksWithErrorsWithoutHealthCheck(endpoints Endpoints) ([]StorageAPI, []error) {
// Bootstrap disks.
storageDisks := make([]StorageAPI, len(endpoints))
g := errgroup.WithNErrs(len(endpoints))
for index := range endpoints {
index := index
g.Go(func() (err error) {
storageDisks[index], err = newStorageAPIWithoutHealthCheck(endpoints[index])
return err
}, index)
}
return storageDisks, g.Wait()
}
// Initialize storage disks for each endpoint.
// Errors are returned for each endpoint with matching index.
func initStorageDisksWithErrors(endpoints Endpoints) ([]StorageAPI, []error) {
// Bootstrap disks.
storageDisks := make([]StorageAPI, len(endpoints))
g := errgroup.WithNErrs(len(endpoints))
for index := range endpoints {
index := index
g.Go(func() (err error) {
storageDisks[index], err = newStorageAPI(endpoints[index])
return err
}, index)
}
return storageDisks, g.Wait()
}
// formatErasureV3ThisEmpty - find out if '.This' field is empty
// in any of the input `formats`, if yes return true.
func formatErasureV3ThisEmpty(formats []*formatErasureV3) bool {
for _, format := range formats {
if format == nil {
continue
}
// NOTE: This code is specifically needed when migrating version
// V1 to V2 to V3, in a scenario such as this we only need to handle
// single sets since we never used to support multiple sets in releases
// with V1 format version.
if len(format.Erasure.Sets) > 1 {
continue
}
if format.Erasure.This == "" {
return true
}
}
return false
}
// fixFormatErasureV3 - fix format Erasure configuration on all disks.
func fixFormatErasureV3(storageDisks []StorageAPI, endpoints Endpoints, formats []*formatErasureV3) error {
g := errgroup.WithNErrs(len(formats))
for i := range formats {
i := i
g.Go(func() error {
if formats[i] == nil || !endpoints[i].IsLocal {
return nil
}
// NOTE: This code is specifically needed when migrating version
// V1 to V2 to V3, in a scenario such as this we only need to handle
// single sets since we never used to support multiple sets in releases
// with V1 format version.
if len(formats[i].Erasure.Sets) > 1 {
return nil
}
if formats[i].Erasure.This == "" {
formats[i].Erasure.This = formats[i].Erasure.Sets[0][i]
// Heal the drive if drive has .This empty.
if err := saveFormatErasure(storageDisks[i], formats[i], true); err != nil {
return err
}
}
return nil
}, i)
}
for _, err := range g.Wait() {
if err != nil {
return err
}
}
return nil
}
// initFormatErasure - save Erasure format configuration on all disks.
func initFormatErasure(ctx context.Context, storageDisks []StorageAPI, setCount, setDriveCount int, distributionAlgo string, deploymentID string, sErrs []error) (*formatErasureV3, error) {
format := newFormatErasureV3(setCount, setDriveCount, distributionAlgo)
formats := make([]*formatErasureV3, len(storageDisks))
wantAtMost := ecDrivesNoConfig(setDriveCount)
for i := 0; i < setCount; i++ {
hostCount := make(map[string]int, setDriveCount)
for j := 0; j < setDriveCount; j++ {
disk := storageDisks[i*setDriveCount+j]
newFormat := format.Clone()
newFormat.Erasure.This = format.Erasure.Sets[i][j]
if deploymentID != "" {
newFormat.ID = deploymentID
}
hostCount[disk.Hostname()]++
formats[i*setDriveCount+j] = newFormat
}
if len(hostCount) > 0 {
var once sync.Once
for host, count := range hostCount {
if count > wantAtMost {
if host == "" {
host = "local"
}
once.Do(func() {
if len(hostCount) == 1 {
return
}
logger.Info(" * Set %v:", i+1)
for j := 0; j < setDriveCount; j++ {
disk := storageDisks[i*setDriveCount+j]
logger.Info(" - Drive: %s", disk.String())
}
})
logger.Info(color.Yellow("WARNING:")+" Host %v has more than %v drives of set. "+
"A host failure will result in data becoming unavailable.", host, wantAtMost)
}
}
}
}
// Mark all root disks down
markRootDisksAsDown(storageDisks, sErrs)
// Save formats `format.json` across all disks.
if err := saveFormatErasureAll(ctx, storageDisks, formats); err != nil {
return nil, err
}
return getFormatErasureInQuorum(formats)
}
// ecDrivesNoConfig returns the erasure coded drives in a set if no config has been set.
// It will attempt to read it from env variable and fall back to drives/2.
func ecDrivesNoConfig(setDriveCount int) int {
ecDrives := globalStorageClass.GetParityForSC(storageclass.STANDARD)
if ecDrives == 0 {
cfg, err := storageclass.LookupConfig(nil, setDriveCount)
if err == nil {
ecDrives = cfg.Standard.Parity
}
if ecDrives == 0 {
ecDrives = setDriveCount / 2
}
}
return ecDrives
}
// Make Erasure backend meta volumes.
func makeFormatErasureMetaVolumes(disk StorageAPI) error {
if disk == nil {
return errDiskNotFound
}
// Attempt to create MinIO internal buckets.
return disk.MakeVolBulk(context.TODO(), minioMetaBucket, minioMetaTmpBucket, minioMetaMultipartBucket, dataUsageBucket)
}
// Initialize a new set of set formats which will be written to all disks.
func newHealFormatSets(refFormat *formatErasureV3, setCount, setDriveCount int, formats []*formatErasureV3, errs []error) [][]*formatErasureV3 {
newFormats := make([][]*formatErasureV3, setCount)
for i := range refFormat.Erasure.Sets {
newFormats[i] = make([]*formatErasureV3, setDriveCount)
}
for i := range refFormat.Erasure.Sets {
for j := range refFormat.Erasure.Sets[i] {
if errors.Is(errs[i*setDriveCount+j], errUnformattedDisk) {
newFormats[i][j] = &formatErasureV3{}
newFormats[i][j].ID = refFormat.ID
newFormats[i][j].Format = refFormat.Format
newFormats[i][j].Version = refFormat.Version
newFormats[i][j].Erasure.This = refFormat.Erasure.Sets[i][j]
newFormats[i][j].Erasure.Sets = refFormat.Erasure.Sets
newFormats[i][j].Erasure.Version = refFormat.Erasure.Version
newFormats[i][j].Erasure.DistributionAlgo = refFormat.Erasure.DistributionAlgo
}
}
}
return newFormats
}