avoid ListBuckets returning quorum errors when node is down (#10555)

Also, revamp the way ListBuckets work make few portions
of the healing logic parallel

- walk objects for healing disks in parallel
- collect the list of buckets in parallel across drives
- provide consistent view for listBuckets()

cmd/background-newdisks-heal-ops.go

@@ -153,11 +153,22 @@ func monitorLocalDisksAndHeal(ctx context.Context, z *erasureZones, bgSeq *healS
 					for _, ep := range endpoints {
 						logger.Info("Healing disk '%s' on %s zone", ep, humanize.Ordinal(i+1))
 
-						if err := healErasureSet(ctx, setIndex, z.zones[i].sets[setIndex], z.zones[i].setDriveCount); err != nil {
+						buckets, err := z.ListBucketsHeal(ctx)
+						if err != nil {
 							logger.LogIf(ctx, err)
 							continue
 						}
 
+						if len(buckets) > 0 {
+							disks := z.zones[i].sets[setIndex].getLoadBalancedDisks()
+							if err := healErasureSet(ctx, setIndex, buckets, disks, z.zones[i].setDriveCount); err != nil {
+								logger.LogIf(ctx, err)
+								continue
+							}
+						}
+
+						logger.Info("Healing disk '%s' on %s zone complete", ep, humanize.Ordinal(i+1))
+
 						// Only upon success pop the healed disk.
 						globalBackgroundHealState.popHealLocalDisks(ep)
 					}

cmd/bootstrap-peer-server.go

@@ -188,7 +188,7 @@ func verifyServerSystemConfig(ctx context.Context, endpointZones EndpointZones)
 			retries++
 			// after 5 retries start logging that servers are not reachable yet
 			if retries >= 5 {
-				logger.Info(fmt.Sprintf("Waiting for atleast %d servers to be online for bootstrap check", len(clnts)/2))
+				logger.Info(fmt.Sprintf("Waiting for atleast %d remote servers to be online for bootstrap check", len(clnts)/2))
 				logger.Info(fmt.Sprintf("Following servers are currently offline or unreachable %s", offlineEndpoints))
 				retries = 0 // reset to log again after 5 retries.
 			}

cmd/erasure-bucket.go

@@ -18,7 +18,6 @@ package cmd
 
 import (
 	"context"
-	"sort"
 
 	"github.com/minio/minio-go/v7/pkg/s3utils"
 	"github.com/minio/minio/cmd/logger"
@@ -122,53 +121,6 @@ func (er erasureObjects) GetBucketInfo(ctx context.Context, bucket string) (bi B
 	return bucketInfo, nil
 }
 
-// listBuckets - returns list of all buckets from a disk picked at random.
-func (er erasureObjects) listBuckets(ctx context.Context) (bucketsInfo []BucketInfo, err error) {
-	for _, disk := range er.getLoadBalancedDisks() {
-		if disk == nil {
-			continue
-		}
-		var volsInfo []VolInfo
-		volsInfo, err = disk.ListVols(ctx)
-		if err == nil {
-			// NOTE: The assumption here is that volumes across all disks in
-			// readQuorum have consistent view i.e they all have same number
-			// of buckets.
-			var bucketsInfo []BucketInfo
-			for _, volInfo := range volsInfo {
-				if isReservedOrInvalidBucket(volInfo.Name, true) {
-					continue
-				}
-				bucketsInfo = append(bucketsInfo, BucketInfo(volInfo))
-			}
-			// For buckets info empty, loop once again to check
-			// if we have, can happen if disks were down.
-			if len(bucketsInfo) == 0 {
-				continue
-			}
-			return bucketsInfo, nil
-		}
-		logger.LogIf(ctx, err)
-		// Ignore any disks not found.
-		if IsErrIgnored(err, bucketMetadataOpIgnoredErrs...) {
-			continue
-		}
-		break
-	}
-	return nil, err
-}
-
-// ListBuckets - lists all the buckets, sorted by its name.
-func (er erasureObjects) ListBuckets(ctx context.Context) ([]BucketInfo, error) {
-	bucketInfos, err := er.listBuckets(ctx)
-	if err != nil {
-		return nil, toObjectErr(err)
-	}
-	// Sort by bucket name before returning.
-	sort.Sort(byBucketName(bucketInfos))
-	return bucketInfos, nil
-}
-
 // Dangling buckets should be handled appropriately, in this following situation
 // we actually have quorum error to be `nil` but we have some disks where
 // the bucket delete returned `errVolumeNotEmpty` but this is not correct

cmd/erasure-healing.go

@@ -155,17 +155,18 @@ func healBucket(ctx context.Context, storageDisks []StorageAPI, storageEndpoints
 
 // listAllBuckets lists all buckets from all disks. It also
 // returns the occurrence of each buckets in all disks
-func listAllBuckets(storageDisks []StorageAPI, healBuckets map[string]VolInfo) (err error) {
-	for _, disk := range storageDisks {
-		if disk == nil {
-			continue
+func listAllBuckets(ctx context.Context, storageDisks []StorageAPI, healBuckets map[string]VolInfo) error {
+	g := errgroup.WithNErrs(len(storageDisks))
+	var mu sync.Mutex
+	for index := range storageDisks {
+		index := index
+		g.Go(func() error {
+			if storageDisks[index] == nil {
+				// we ignore disk not found errors
+				return nil
 			}
-		var volsInfo []VolInfo
-		volsInfo, err = disk.ListVols(context.TODO())
+			volsInfo, err := storageDisks[index].ListVols(ctx)
 			if err != nil {
-			if IsErrIgnored(err, bucketMetadataOpIgnoredErrs...) {
-				continue
-			}
 				return err
 			}
 			for _, volInfo := range volsInfo {
@@ -175,14 +176,16 @@ func listAllBuckets(storageDisks []StorageAPI, healBuckets map[string]VolInfo) (
 				if isReservedOrInvalidBucket(volInfo.Name, false) {
 					continue
 				}
-			// always save unique buckets across drives.
+				mu.Lock()
 				if _, ok := healBuckets[volInfo.Name]; !ok {
 					healBuckets[volInfo.Name] = volInfo
 				}
-
-		}
+				mu.Unlock()
 			}
 			return nil
+		}, index)
+	}
+	return reduceReadQuorumErrs(ctx, g.Wait(), bucketMetadataOpIgnoredErrs, len(storageDisks)/2)
 }
 
 // Only heal on disks where we are sure that healing is needed. We can expand

cmd/erasure-sets.go

@@ -665,7 +665,7 @@ func undoDeleteBucketSets(ctx context.Context, bucket string, sets []*erasureObj
 // that all buckets are present on all sets.
 func (s *erasureSets) ListBuckets(ctx context.Context) (buckets []BucketInfo, err error) {
 	// Always lists from the same set signified by the empty string.
-	return s.getHashedSet("").ListBuckets(ctx)
+	return s.ListBucketsHeal(ctx)
 }
 
 // --- Object Operations ---
@@ -1465,7 +1465,7 @@ func (s *erasureSets) ListBucketsHeal(ctx context.Context) ([]BucketInfo, error)
 	var healBuckets = map[string]VolInfo{}
 	for _, set := range s.sets {
 		// lists all unique buckets across drives.
-		if err := listAllBuckets(set.getDisks(), healBuckets); err != nil {
+		if err := listAllBuckets(ctx, set.getDisks(), healBuckets); err != nil {
 			return nil, err
 		}
 	}

cmd/erasure-zones.go

@@ -298,12 +298,11 @@ func (z *erasureZones) CrawlAndGetDataUsage(ctx context.Context, bf *bloomFilter
 
 	// Collect for each set in zones.
 	for _, z := range z.zones {
-		for _, erObj := range z.sets {
-			// Add new buckets.
-			buckets, err := erObj.ListBuckets(ctx)
+		buckets, err := z.ListBuckets(ctx)
 		if err != nil {
 			return err
 		}
+		// Add new buckets.
 		for _, b := range buckets {
 			if _, ok := knownBuckets[b.Name]; ok {
 				continue
@@ -311,6 +310,7 @@ func (z *erasureZones) CrawlAndGetDataUsage(ctx context.Context, bf *bloomFilter
 			allBuckets = append(allBuckets, b)
 			knownBuckets[b.Name] = struct{}{}
 		}
+		for _, erObj := range z.sets {
 			wg.Add(1)
 			results = append(results, dataUsageCache{})
 			go func(i int, erObj *erasureObjects) {

cmd/global-heal.go

@@ -18,6 +18,7 @@ package cmd
 
 import (
 	"context"
+	"sync"
 	"time"
 
 	"github.com/minio/minio/cmd/logger"
@@ -89,12 +90,7 @@ func getLocalBackgroundHealStatus() (madmin.BgHealState, bool) {
 }
 
 // healErasureSet lists and heals all objects in a specific erasure set
-func healErasureSet(ctx context.Context, setIndex int, xlObj *erasureObjects, setDriveCount int) error {
-	buckets, err := xlObj.ListBuckets(ctx)
-	if err != nil {
-		return err
-	}
-
+func healErasureSet(ctx context.Context, setIndex int, buckets []BucketInfo, disks []StorageAPI, setDriveCount int) error {
 	// Get background heal sequence to send elements to heal
 	var bgSeq *healSequence
 	var ok bool
@@ -125,22 +121,30 @@ func healErasureSet(ctx context.Context, setIndex int, xlObj *erasureObjects, se
 		}
 
 		var entryChs []FileInfoVersionsCh
-		for _, disk := range xlObj.getLoadBalancedDisks() {
+		var mu sync.Mutex
+		var wg sync.WaitGroup
+		for _, disk := range disks {
 			if disk == nil {
 				// Disk can be offline
 				continue
 			}
-
+			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.
-				continue
+					return
 				}
-
+				mu.Lock()
 				entryChs = append(entryChs, FileInfoVersionsCh{
 					Ch: entryCh,
 				})
+				mu.Unlock()
+			}()
 		}
+		wg.Wait()
 
 		entriesValid := make([]bool, len(entryChs))
 		entries := make([]FileInfoVersions, len(entryChs))

cmd/server-main.go

@@ -305,31 +305,13 @@ func initAllSubsystems(ctx context.Context, newObject ObjectLayer) (err error) {
 	// are modifying this code that you do so, if and when
 	// you want to add extra context to your error. This
 	// ensures top level retry works accordingly.
-	var buckets []BucketInfo
-	if globalIsDistErasure || globalIsErasure {
 	// List buckets to heal, and be re-used for loading configs.
+	var buckets []BucketInfo
+	if globalIsErasure {
 		buckets, err = newObject.ListBucketsHeal(ctx)
 		if err != nil {
 			return fmt.Errorf("Unable to list buckets to heal: %w", err)
 		}
-		// Attempt a heal if possible and re-use the bucket names
-		// to reload their config.
-		wquorum := &InsufficientWriteQuorum{}
-		rquorum := &InsufficientReadQuorum{}
-		for _, bucket := range buckets {
-			if err = newObject.MakeBucketWithLocation(ctx, bucket.Name, BucketOptions{}); err != nil {
-				if errors.As(err, &wquorum) || errors.As(err, &rquorum) {
-					// Return the error upwards for the caller to retry.
-					return fmt.Errorf("Unable to heal bucket: %w", err)
-				}
-				if _, ok := err.(BucketExists); !ok {
-					// ignore any other error and log for investigation.
-					logger.LogIf(ctx, err)
-					continue
-				}
-				// Bucket already exists, nothing that needs to be done.
-			}
-		}
 	} else {
 		buckets, err = newObject.ListBuckets(ctx)
 		if err != nil {
@@ -349,7 +331,7 @@ func initAllSubsystems(ctx context.Context, newObject ObjectLayer) (err error) {
 	}
 
 	// Initialize bucket metadata sub-system.
-	if err := globalBucketMetadataSys.Init(ctx, buckets, newObject); err != nil {
+	if err = globalBucketMetadataSys.Init(ctx, buckets, newObject); err != nil {
 		return fmt.Errorf("Unable to initialize bucket metadata sub-system: %w", err)
 	}