minio/cmd/global-heal.go
Harshavardhana 96c0ce1f0c
add support for tuning healing to make healing more aggressive (#11003)
supports `mc admin config set <alias> heal sleep=100ms` to
enable more aggressive healing under certain times.

also optimize some areas that were doing extra checks than
necessary when bitrotscan was enabled, avoid double sleeps
make healing more predictable.

fixes #10497
2020-12-02 11:12:00 -08:00

196 lines
5.0 KiB
Go

/*
* 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"
"sync"
"time"
"github.com/minio/minio/cmd/logger"
"github.com/minio/minio/pkg/madmin"
)
const (
bgHealingUUID = "0000-0000-0000-0000"
)
// NewBgHealSequence creates a background healing sequence
// operation which crawls all objects and heal them.
func newBgHealSequence() *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,
// run-background heal with reserved bucket
bucket: minioReservedBucket,
settings: hs,
currentStatus: healSequenceStatus{
Summary: healNotStartedStatus,
HealSettings: hs,
},
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, bool) {
if globalBackgroundHealState == nil {
return madmin.BgHealState{}, false
}
bgSeq, ok := globalBackgroundHealState.getHealSequenceByToken(bgHealingUUID)
if !ok {
return madmin.BgHealState{}, false
}
var healDisksMap = map[string]struct{}{}
for _, ep := range getLocalDisksToHeal() {
healDisksMap[ep.String()] = struct{}{}
}
for _, ep := range globalBackgroundHealState.getHealLocalDisks() {
if _, ok := healDisksMap[ep.String()]; !ok {
healDisksMap[ep.String()] = struct{}{}
}
}
var healDisks []string
for disk := range healDisksMap {
healDisks = append(healDisks, disk)
}
return madmin.BgHealState{
ScannedItemsCount: bgSeq.getScannedItemsCount(),
LastHealActivity: bgSeq.lastHealActivity,
HealDisks: healDisks,
NextHealRound: UTCNow(),
}, true
}
// healErasureSet lists and heals all objects in a specific erasure set
func healErasureSet(ctx context.Context, setIndex int, buckets []BucketInfo, disks []StorageAPI) error {
// 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
}
}
buckets = append(buckets, BucketInfo{
Name: pathJoin(minioMetaBucket, minioConfigPrefix),
}, BucketInfo{
Name: pathJoin(minioMetaBucket, bucketConfigPrefix),
}) // add metadata .minio.sys/ bucket prefixes to heal
// Try to pro-actively heal backend-encrypted file.
bgSeq.sourceCh <- healSource{
bucket: minioMetaBucket,
object: backendEncryptedFile,
}
// Heal all buckets with all objects
for _, bucket := range buckets {
// Heal current bucket
bgSeq.sourceCh <- healSource{
bucket: bucket.Name,
}
var entryChs []FileInfoVersionsCh
var mu sync.Mutex
var wg sync.WaitGroup
for _, disk := range disks {
disk := disk
wg.Add(1)
go func() {
defer wg.Done()
entryCh, err := disk.WalkVersions(ctx, bucket.Name, "", "", true, ctx.Done())
if err != nil {
// Disk walk returned error, ignore it.
return
}
mu.Lock()
entryChs = append(entryChs, FileInfoVersionsCh{
Ch: entryCh,
})
mu.Unlock()
}()
}
wg.Wait()
entriesValid := make([]bool, len(entryChs))
entries := make([]FileInfoVersions, len(entryChs))
for {
entry, _, ok := lexicallySortedEntryVersions(entryChs, entries, entriesValid)
if !ok {
break
}
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, ok := globalBackgroundHealState.getHealSequenceByToken(bgHealingUUID)
if ok {
bgSeq.sourceCh <- healSource{
bucket: bucket,
object: object,
versionID: versionID,
opts: &madmin.HealOpts{
Remove: true, // if found dangling purge it.
ScanMode: madmin.HealDeepScan,
},
}
}
}