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minio/cmd/global-heal.go

232 lines
5.7 KiB

/*
* MinIO Cloud Storage, (C) 2019 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"
"time"
"github.com/minio/minio/cmd/logger"
"github.com/minio/minio/pkg/madmin"
)
const (
bgHealingUUID = "0000-0000-0000-0000"
leaderTick = time.Hour
healInterval = 30 * 24 * time.Hour
)
var leaderLockTimeout = newDynamicTimeout(time.Minute, time.Minute)
// NewBgHealSequence creates a background healing sequence
// operation which crawls all objects and heal them.
func newBgHealSequence(numDisks int) *healSequence {
reqInfo := &logger.ReqInfo{API: "BackgroundHeal"}
ctx, cancelCtx := context.WithCancel(logger.SetReqInfo(GlobalContext, reqInfo))
hs := madmin.HealOpts{
// Remove objects that do not have read-quorum
Remove: true,
ScanMode: madmin.HealNormalScan,
}
return &healSequence{
sourceCh: make(chan healSource),
respCh: make(chan healResult),
startTime: UTCNow(),
clientToken: bgHealingUUID,
settings: hs,
currentStatus: healSequenceStatus{
Summary: healNotStartedStatus,
HealSettings: hs,
NumDisks: numDisks,
},
cancelCtx: cancelCtx,
ctx: ctx,
reportProgress: false,
scannedItemsMap: make(map[madmin.HealItemType]int64),
healedItemsMap: make(map[madmin.HealItemType]int64),
healFailedItemsMap: make(map[string]int64),
}
}
func getLocalBackgroundHealStatus() madmin.BgHealState {
bgSeq, ok := globalBackgroundHealState.getHealSequenceByToken(bgHealingUUID)
if !ok {
return madmin.BgHealState{}
}
return madmin.BgHealState{
ScannedItemsCount: bgSeq.getScannedItemsCount(),
LastHealActivity: bgSeq.lastHealActivity,
NextHealRound: UTCNow().Add(durationToNextHealRound(bgSeq.lastHealActivity)),
}
}
// healErasureSet lists and heals all objects in a specific erasure set
func healErasureSet(ctx context.Context, setIndex int, xlObj *erasureObjects, drivesPerSet int) error {
buckets, err := xlObj.ListBuckets(ctx)
if err != nil {
return err
}
// Get background heal sequence to send elements to heal
var bgSeq *healSequence
var ok bool
for {
bgSeq, ok = globalBackgroundHealState.getHealSequenceByToken(bgHealingUUID)
if ok {
break
}
select {
case <-ctx.Done():
return nil
case <-time.After(time.Second):
continue
}
}
// Heal all buckets with all objects
for _, bucket := range buckets {
// Heal current bucket
bgSeq.sourceCh <- healSource{
bucket: bucket.Name,
}
var entryChs []FileInfoVersionsCh
for _, disk := range xlObj.getLoadBalancedDisks() {
if disk == nil {
// Disk can be offline
continue
}
entryCh, err := disk.WalkVersions(bucket.Name, "", "", true, ctx.Done())
if err != nil {
// Disk walk returned error, ignore it.
continue
}
entryChs = append(entryChs, FileInfoVersionsCh{
Ch: entryCh,
})
}
entriesValid := make([]bool, len(entryChs))
entries := make([]FileInfoVersions, len(entryChs))
for {
entry, quorumCount, ok := lexicallySortedEntryVersions(entryChs, entries, entriesValid)
if !ok {
break
}
if quorumCount == drivesPerSet {
// Skip good entries.
continue
}
for _, version := range entry.Versions {
bgSeq.sourceCh <- healSource{
bucket: bucket.Name,
object: version.Name,
versionID: version.VersionID,
}
}
}
}
return nil
}
// deepHealObject heals given object path in deep to fix bitrot.
func deepHealObject(bucket, object, versionID string) {
// Get background heal sequence to send elements to heal
bgSeq, _ := globalBackgroundHealState.getHealSequenceByToken(bgHealingUUID)
bgSeq.sourceCh <- healSource{
bucket: bucket,
object: object,
versionID: versionID,
opts: &madmin.HealOpts{ScanMode: madmin.HealDeepScan},
}
}
// Returns the duration to the next background healing round
func durationToNextHealRound(lastHeal time.Time) time.Duration {
if lastHeal.IsZero() {
lastHeal = globalBootTime
}
d := lastHeal.Add(healInterval).Sub(UTCNow())
if d < 0 {
return time.Second
}
return d
}
// Healing leader will take the charge of healing all erasure sets
func execLeaderTasks(ctx context.Context, z *erasureZones) {
// So that we don't heal immediately, but after one month.
lastScanTime := UTCNow()
// Get background heal sequence to send elements to heal
var bgSeq *healSequence
var ok bool
for {
bgSeq, ok = globalBackgroundHealState.getHealSequenceByToken(bgHealingUUID)
if ok {
break
}
select {
case <-ctx.Done():
return
case <-time.After(time.Second):
continue
}
}
for {
select {
case <-ctx.Done():
return
case <-time.NewTimer(durationToNextHealRound(lastScanTime)).C:
bgSeq.resetHealStatusCounters()
for _, zone := range z.zones {
// Heal set by set
for i, set := range zone.sets {
if err := healErasureSet(ctx, i, set, zone.drivesPerSet); err != nil {
logger.LogIf(ctx, err)
continue
}
}
}
lastScanTime = UTCNow()
}
}
}
func startGlobalHeal(ctx context.Context, objAPI ObjectLayer) {
zones, ok := objAPI.(*erasureZones)
if !ok {
return
}
execLeaderTasks(ctx, zones)
}
func initGlobalHeal(ctx context.Context, objAPI ObjectLayer) {
go startGlobalHeal(ctx, objAPI)
}