use list cache for Walk() with webUI and quota (#10814)

bring list cache optimizations for web UI
object listing, also FIFO quota enforcement
through list cache as well.

cmd/erasure-server-sets.go

@@ -658,99 +658,6 @@ func (z *erasureServerSets) ListObjectsV2(ctx context.Context, bucket, prefix, c
 	return listObjectsV2Info, err
 }
 
-// Calculate least entry across zones and across multiple FileInfo
-// channels, returns the least common entry and the total number of times
-// we found this entry. Additionally also returns a boolean
-// to indicate if the caller needs to call this function
-// again to list the next entry. It is callers responsibility
-// if the caller wishes to list N entries to call lexicallySortedEntry
-// N times until this boolean is 'false'.
-func lexicallySortedEntryZone(zoneEntryChs [][]FileInfoCh, zoneEntries [][]FileInfo, zoneEntriesValid [][]bool) (FileInfo, int, int, bool) {
-	for i, entryChs := range zoneEntryChs {
-		for j := range entryChs {
-			zoneEntries[i][j], zoneEntriesValid[i][j] = entryChs[j].Pop()
-		}
-	}
-
-	var isTruncated = false
-	for _, entriesValid := range zoneEntriesValid {
-		for _, valid := range entriesValid {
-			if !valid {
-				continue
-			}
-			isTruncated = true
-			break
-		}
-		if isTruncated {
-			break
-		}
-	}
-
-	var lentry FileInfo
-	var found bool
-	var zoneIndex = -1
-	// TODO: following loop can be merged with above
-	// loop, explore this possibility.
-	for i, entriesValid := range zoneEntriesValid {
-		for j, valid := range entriesValid {
-			if !valid {
-				continue
-			}
-			if !found {
-				lentry = zoneEntries[i][j]
-				found = true
-				zoneIndex = i
-				continue
-			}
-			str1 := zoneEntries[i][j].Name
-			str2 := lentry.Name
-			if HasSuffix(str1, globalDirSuffix) {
-				str1 = strings.TrimSuffix(str1, globalDirSuffix) + slashSeparator
-			}
-			if HasSuffix(str2, globalDirSuffix) {
-				str2 = strings.TrimSuffix(str2, globalDirSuffix) + slashSeparator
-			}
-
-			if str1 < str2 {
-				lentry = zoneEntries[i][j]
-				zoneIndex = i
-			}
-		}
-	}
-
-	// We haven't been able to find any least entry,
-	// this would mean that we don't have valid entry.
-	if !found {
-		return lentry, 0, zoneIndex, isTruncated
-	}
-
-	lexicallySortedEntryCount := 0
-	for i, entriesValid := range zoneEntriesValid {
-		for j, valid := range entriesValid {
-			if !valid {
-				continue
-			}
-
-			// Entries are duplicated across disks,
-			// we should simply skip such entries.
-			if lentry.Name == zoneEntries[i][j].Name && lentry.ModTime.Equal(zoneEntries[i][j].ModTime) {
-				lexicallySortedEntryCount++
-				continue
-			}
-
-			// Push all entries which are lexically higher
-			// and will be returned later in Pop()
-			zoneEntryChs[i][j].Push(zoneEntries[i][j])
-		}
-	}
-
-	if HasSuffix(lentry.Name, globalDirSuffix) {
-		lentry.Name = strings.TrimSuffix(lentry.Name, globalDirSuffix) + slashSeparator
-	}
-
-	return lentry, lexicallySortedEntryCount, zoneIndex, isTruncated
-}
-
 // Calculate least entry across serverSets and across multiple FileInfoVersions
 // channels, returns the least common entry and the total number of times
 // we found this entry. Additionally also returns a boolean
@@ -854,6 +761,7 @@ func (z *erasureServerSets) ListObjectVersions(ctx context.Context, bucket, pref
 		Limit:       maxKeys,
 		Marker:      marker,
 		InclDeleted: true,
+		AskDisks:    globalAPIConfig.getListQuorum(),
 	})
 	if err != nil && err != io.EOF {
 		return loi, err
@@ -881,6 +789,7 @@ func (z *erasureServerSets) ListObjects(ctx context.Context, bucket, prefix, mar
 		Limit:       maxKeys,
 		Marker:      marker,
 		InclDeleted: false,
+		AskDisks:    globalAPIConfig.getListQuorum(),
 	})
 	if err != nil && err != io.EOF {
 		logger.LogIf(ctx, err)
@@ -1330,76 +1239,51 @@ func (z *erasureServerSets) Walk(ctx context.Context, bucket, prefix string, res
 		return err
 	}
 
-	serverSetsListTolerancePerSet := make([]int, 0, len(z.serverSets))
-	for _, zone := range z.serverSets {
-		quorum := globalAPIConfig.getListQuorum()
-		switch quorum {
-		case -1:
-			serverSetsListTolerancePerSet = append(serverSetsListTolerancePerSet, zone.setDriveCount/2)
-		default:
-			serverSetsListTolerancePerSet = append(serverSetsListTolerancePerSet, quorum)
-		}
-	}
-
 	if opts.WalkVersions {
-		var serverSetsEntryChs [][]FileInfoVersionsCh
-		for _, zone := range z.serverSets {
-			serverSetsEntryChs = append(serverSetsEntryChs, zone.startMergeWalksVersions(ctx, bucket, prefix, "", true, ctx.Done()))
-		}
-
-		var serverSetsEntriesInfos [][]FileInfoVersions
-		var serverSetsEntriesValid [][]bool
-		for _, entryChs := range serverSetsEntryChs {
-			serverSetsEntriesInfos = append(serverSetsEntriesInfos, make([]FileInfoVersions, len(entryChs)))
-			serverSetsEntriesValid = append(serverSetsEntriesValid, make([]bool, len(entryChs)))
-		}
-
 		go func() {
 			defer close(results)
 
+			var marker, versionIDMarker string
 			for {
-				entry, quorumCount, zoneIdx, ok := lexicallySortedEntryZoneVersions(serverSetsEntryChs, serverSetsEntriesInfos, serverSetsEntriesValid)
+				loi, err := z.ListObjectVersions(ctx, bucket, prefix, marker, versionIDMarker, "", 1000)
-				if !ok {
+				if err != nil {
-					// We have reached EOF across all entryChs, break the loop.
+					break
-					return
 				}
 
-				if quorumCount >= serverSetsListTolerancePerSet[zoneIdx] {
+				for _, obj := range loi.Objects {
-					for _, version := range entry.Versions {
+					results <- obj
-						results <- version.ToObjectInfo(bucket, version.Name)
 				}
+
+				if !loi.IsTruncated {
+					break
 				}
+
+				marker = loi.NextMarker
+				versionIDMarker = loi.NextVersionIDMarker
 			}
 		}()
-
 		return nil
 	}
 
-	serverSetsEntryChs := make([][]FileInfoCh, 0, len(z.serverSets))
-	for _, zone := range z.serverSets {
-		serverSetsEntryChs = append(serverSetsEntryChs, zone.startMergeWalks(ctx, bucket, prefix, "", true, ctx.Done()))
-	}
-
-	serverSetsEntriesInfos := make([][]FileInfo, 0, len(serverSetsEntryChs))
-	serverSetsEntriesValid := make([][]bool, 0, len(serverSetsEntryChs))
-	for _, entryChs := range serverSetsEntryChs {
-		serverSetsEntriesInfos = append(serverSetsEntriesInfos, make([]FileInfo, len(entryChs)))
-		serverSetsEntriesValid = append(serverSetsEntriesValid, make([]bool, len(entryChs)))
-	}
-
 	go func() {
 		defer close(results)
 
+		var marker string
 		for {
-			entry, quorumCount, zoneIdx, ok := lexicallySortedEntryZone(serverSetsEntryChs, serverSetsEntriesInfos, serverSetsEntriesValid)
+			loi, err := z.ListObjects(ctx, bucket, prefix, marker, "", 1000)
-			if !ok {
+			if err != nil {
-				// We have reached EOF across all entryChs, break the loop.
+				break
-				return
 			}
 
-			if quorumCount >= serverSetsListTolerancePerSet[zoneIdx] {
+			for _, obj := range loi.Objects {
-				results <- entry.ToObjectInfo(bucket, entry.Name)
+				results <- obj
 			}
+
+			if !loi.IsTruncated {
+				break
+			}
+
+			marker = loi.NextMarker
 		}
 	}()
 

cmd/metacache-server-sets.go

@@ -99,7 +99,8 @@ func (z *erasureServerSets) listPath(ctx context.Context, o listPathOptions) (en
 			if err != nil {
 				if errors.Is(err, context.Canceled) || errors.Is(err, context.DeadlineExceeded) {
 					// Context is canceled, return at once.
-					return entries, err
+					// request canceled, no entries to return
+					return entries, io.EOF
 				}
 				logger.LogIf(ctx, err)
 				cache = localMetacacheMgr.getTransient().findCache(o)
@@ -109,17 +110,14 @@ func (z *erasureServerSets) listPath(ctx context.Context, o listPathOptions) (en
 			}
 		}
 		if cache.fileNotFound {
-			return entries, errFileNotFound
+			// No cache found, no entries found.
+			return entries, io.EOF
 		}
 		// Only create if we created a new.
 		o.Create = o.ID == cache.id
 		o.ID = cache.id
 	}
 
-	if o.AskDisks == 0 {
-		o.AskDisks = globalAPIConfig.getListQuorum()
-	}
-
 	var mu sync.Mutex
 	var wg sync.WaitGroup
 	var errs []error
@@ -175,7 +173,8 @@ func (z *erasureServerSets) listPath(ctx context.Context, o listPathOptions) (en
 		cache.fileNotFound = true
 		_, err := o.updateMetacacheListing(cache, globalNotificationSys.restClientFromHash(o.Bucket))
 		logger.LogIf(ctx, err)
-		return entries, errFileNotFound
+		// cache returned not found, entries truncated.
+		return entries, io.EOF
 	}
 
 	for _, err := range errs {