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minio/cmd/background-newdisks-heal-op...

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/*
* 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"
"errors"
"fmt"
"time"
"github.com/dustin/go-humanize"
"github.com/minio/minio/cmd/logger"
)
const (
defaultMonitorNewDiskInterval = time.Second * 10
healingTrackerFilename = ".healing.bin"
)
//go:generate msgp -file $GOFILE -unexported
type healingTracker struct {
ID string
// future add more tracking capabilities
}
func initAutoHeal(ctx context.Context, objAPI ObjectLayer) {
z, ok := objAPI.(*erasureServerSets)
if !ok {
return
}
initBackgroundHealing(ctx, objAPI) // start quick background healing
var bgSeq *healSequence
var found bool
for {
bgSeq, found = globalBackgroundHealState.getHealSequenceByToken(bgHealingUUID)
if found {
break
}
time.Sleep(time.Second)
}
globalBackgroundHealState.pushHealLocalDisks(getLocalDisksToHeal()...)
if drivesToHeal := globalBackgroundHealState.healDriveCount(); drivesToHeal > 0 {
logger.Info(fmt.Sprintf("Found drives to heal %d, waiting until %s to heal the content...",
drivesToHeal, defaultMonitorNewDiskInterval))
// Heal any disk format and metadata early, if possible.
if err := bgSeq.healDiskMeta(); err != nil {
if newObjectLayerFn() != nil {
// log only in situations, when object layer
// has fully initialized.
logger.LogIf(bgSeq.ctx, err)
}
}
}
go monitorLocalDisksAndHeal(ctx, z, bgSeq)
}
func getLocalDisksToHeal() (disksToHeal Endpoints) {
for _, ep := range globalEndpoints {
for _, endpoint := range ep.Endpoints {
if !endpoint.IsLocal {
continue
}
// Try to connect to the current endpoint
// and reformat if the current disk is not formatted
disk, _, err := connectEndpoint(endpoint)
if errors.Is(err, errUnformattedDisk) {
disksToHeal = append(disksToHeal, endpoint)
} else if err == nil && disk != nil && disk.Healing() {
disksToHeal = append(disksToHeal, disk.Endpoint())
}
}
}
return disksToHeal
}
func initBackgroundHealing(ctx context.Context, objAPI ObjectLayer) {
// Run the background healer
globalBackgroundHealRoutine = newHealRoutine()
go globalBackgroundHealRoutine.run(ctx, objAPI)
globalBackgroundHealState.LaunchNewHealSequence(newBgHealSequence())
}
// monitorLocalDisksAndHeal - ensures that detected new disks are healed
// 1. Only the concerned erasure set will be listed and healed
// 2. Only the node hosting the disk is responsible to perform the heal
func monitorLocalDisksAndHeal(ctx context.Context, z *erasureServerSets, bgSeq *healSequence) {
// Perform automatic disk healing when a disk is replaced locally.
for {
select {
case <-ctx.Done():
return
case <-time.After(defaultMonitorNewDiskInterval):
waitForLowHTTPReq(int32(globalEndpoints.NEndpoints()), time.Second)
var erasureSetInZoneDisksToHeal []map[int][]StorageAPI
healDisks := globalBackgroundHealState.getHealLocalDisks()
if len(healDisks) > 0 {
// Reformat disks
bgSeq.sourceCh <- healSource{bucket: SlashSeparator}
// Ensure that reformatting disks is finished
bgSeq.sourceCh <- healSource{bucket: nopHeal}
logger.Info(fmt.Sprintf("Found drives to heal %d, proceeding to heal content...",
len(healDisks)))
erasureSetInZoneDisksToHeal = make([]map[int][]StorageAPI, len(z.serverSets))
for i := range z.serverSets {
erasureSetInZoneDisksToHeal[i] = map[int][]StorageAPI{}
}
}
// heal only if new disks found.
for _, endpoint := range healDisks {
disk, format, err := connectEndpoint(endpoint)
if err != nil {
printEndpointError(endpoint, err, true)
continue
}
zoneIdx := globalEndpoints.GetLocalZoneIdx(disk.Endpoint())
if zoneIdx < 0 {
continue
}
// Calculate the set index where the current endpoint belongs
setIndex, _, err := findDiskIndex(z.serverSets[zoneIdx].format, format)
if err != nil {
printEndpointError(endpoint, err, false)
continue
}
erasureSetInZoneDisksToHeal[zoneIdx][setIndex] = append(erasureSetInZoneDisksToHeal[zoneIdx][setIndex], disk)
}
buckets, _ := z.ListBucketsHeal(ctx)
for i, setMap := range erasureSetInZoneDisksToHeal {
for setIndex, disks := range setMap {
for _, disk := range disks {
logger.Info("Healing disk '%s' on %s zone", disk, humanize.Ordinal(i+1))
lbDisks := z.serverSets[i].sets[setIndex].getOnlineDisks()
if err := healErasureSet(ctx, setIndex, buckets, lbDisks); err != nil {
logger.LogIf(ctx, err)
continue
}
logger.Info("Healing disk '%s' on %s zone complete", disk, humanize.Ordinal(i+1))
if err := disk.DeleteFile(ctx, pathJoin(minioMetaBucket, bucketMetaPrefix),
healingTrackerFilename); err != nil {
logger.LogIf(ctx, err)
continue
}
// Only upon success pop the healed disk.
globalBackgroundHealState.popHealLocalDisks(disk.Endpoint())
}
}
}
}
}
}