allow server to start even with corrupted/faulty disks (#10175)

cmd/config/errors.go

@@ -187,12 +187,6 @@ Example 1:
 		"",
 	)
 
-	ErrCorruptedBackend = newErrFn(
-		"Unable to use the specified backend, pre-existing content detected",
-		"Please ensure your disk mount does not have any pre-existing content",
-		"",
-	)
-
 	ErrUnableToWriteInBackend = newErrFn(
 		"Unable to write to the backend",
 		"Please ensure MinIO binary has write permissions for the backend",

cmd/erasure-healing.go

@@ -18,6 +18,7 @@ package cmd
 
 import (
 	"context"
+	"errors"
 	"fmt"
 	"io"
 	"sync"
@@ -197,10 +198,10 @@ func listAllBuckets(storageDisks []StorageAPI, healBuckets map[string]VolInfo) (
 // Only heal on disks where we are sure that healing is needed. We can expand
 // this list as and when we figure out more errors can be added to this list safely.
 func shouldHealObjectOnDisk(erErr, dataErr error, meta FileInfo, quorumModTime time.Time) bool {
-	switch erErr {
-	case errFileNotFound, errFileVersionNotFound:
+	switch {
+	case errors.Is(erErr, errFileNotFound) || errors.Is(erErr, errFileVersionNotFound):
 		return true
-	case errCorruptedFormat:
+	case errors.Is(erErr, errCorruptedFormat):
 		return true
 	}
 	if erErr == nil {
@@ -686,9 +687,9 @@ func isObjectDangling(metaArr []FileInfo, errs []error, dataErrs []error) (valid
 	// or when er.meta is not readable in read quorum disks.
 	var notFoundErasureMeta, corruptedErasureMeta int
 	for _, readErr := range errs {
-		if readErr == errFileNotFound || readErr == errFileVersionNotFound {
+		if errors.Is(readErr, errFileNotFound) || errors.Is(readErr, errFileVersionNotFound) {
 			notFoundErasureMeta++
-		} else if readErr == errCorruptedFormat {
+		} else if errors.Is(readErr, errCorruptedFormat) {
 			corruptedErasureMeta++
 		}
 	}
@@ -699,7 +700,10 @@ func isObjectDangling(metaArr []FileInfo, errs []error, dataErrs []error) (valid
 		// double counting when both parts and er.meta
 		// are not available.
 		if errs[i] != dataErrs[i] {
-			if dataErrs[i] == errFileNotFound || dataErrs[i] == errFileVersionNotFound {
+			if IsErr(dataErrs[i], []error{
+				errFileNotFound,
+				errFileVersionNotFound,
+			}...) {
 				notFoundParts++
 			}
 		}

cmd/erasure-sets.go

@@ -1199,21 +1199,11 @@ func (s *erasureSets) ReloadFormat(ctx context.Context, dryRun bool) (err error)
 		}
 	}(storageDisks)
 
-	formats, sErrs := loadFormatErasureAll(storageDisks, false)
+	formats, _ := loadFormatErasureAll(storageDisks, false)
 	if err = checkFormatErasureValues(formats, s.drivesPerSet); err != nil {
 		return err
 	}
 
-	for index, sErr := range sErrs {
-		if sErr != nil {
-			// Look for acceptable heal errors, for any other
-			// errors we should simply quit and return.
-			if _, ok := formatHealErrors[sErr]; !ok {
-				return fmt.Errorf("Disk %s: %w", s.endpoints[index], sErr)
-			}
-		}
-	}
-
 	refFormat, err := getFormatErasureInQuorum(formats)
 	if err != nil {
 		return err
@@ -1357,16 +1347,6 @@ func (s *erasureSets) HealFormat(ctx context.Context, dryRun bool) (res madmin.H
 		res.After.Drives[k] = madmin.HealDriveInfo(v)
 	}
 
-	for index, sErr := range sErrs {
-		if sErr != nil {
-			// Look for acceptable heal errors, for any other
-			// errors we should simply quit and return.
-			if _, ok := formatHealErrors[sErr]; !ok {
-				return res, fmt.Errorf("Disk %s: %w", s.endpoints[index], sErr)
-			}
-		}
-	}
-
 	if countErrs(sErrs, errUnformattedDisk) == 0 {
 		// No unformatted disks found disks are either offline
 		// or online, no healing is required.

cmd/erasure.go

@@ -18,6 +18,7 @@ package cmd
 
 import (
 	"context"
+	"errors"
 	"fmt"
 	"sort"
 	"sync"
@@ -89,18 +90,18 @@ func (d byDiskTotal) Less(i, j int) bool {
 
 func diskErrToDriveState(err error) (state string) {
 	state = madmin.DriveStateUnknown
-	switch err {
-	case errDiskNotFound:
+	switch {
+	case errors.Is(err, errDiskNotFound):
 		state = madmin.DriveStateOffline
-	case errCorruptedFormat:
+	case errors.Is(err, errCorruptedFormat):
 		state = madmin.DriveStateCorrupt
-	case errUnformattedDisk:
+	case errors.Is(err, errUnformattedDisk):
 		state = madmin.DriveStateUnformatted
-	case errDiskAccessDenied:
+	case errors.Is(err, errDiskAccessDenied):
 		state = madmin.DriveStatePermission
-	case errFaultyDisk:
+	case errors.Is(err, errFaultyDisk):
 		state = madmin.DriveStateFaulty
-	case nil:
+	case err == nil:
 		state = madmin.DriveStateOk
 	}
 	return

cmd/format-erasure.go

@@ -27,7 +27,6 @@ import (
 	"sync"
 
 	humanize "github.com/dustin/go-humanize"
-	"github.com/minio/minio/cmd/config"
 	"github.com/minio/minio/cmd/config/storageclass"
 	"github.com/minio/minio/cmd/logger"
 	"github.com/minio/minio/pkg/color"
@@ -58,18 +57,6 @@ const (
 // Offline disk UUID represents an offline disk.
 const offlineDiskUUID = "ffffffff-ffff-ffff-ffff-ffffffffffff"
 
-// Healing is only supported for the list of errors mentioned here.
-var formatHealErrors = map[error]struct{}{
-	errUnformattedDisk: {},
-	errDiskNotFound:    {},
-}
-
-// List of errors considered critical for disk formatting.
-var formatCriticalErrors = map[error]struct{}{
-	errCorruptedFormat: {},
-	errFaultyDisk:      {},
-}
-
 // Used to detect the version of "xl" format.
 type formatErasureVersionDetect struct {
 	Erasure struct {
@@ -415,7 +402,8 @@ func loadFormatErasure(disk StorageAPI) (format *formatErasureV3, err error) {
 			}
 			if !isHiddenDirectories(vols...) {
 				// 'format.json' not found, but we found user data, reject such disks.
-				return nil, errCorruptedFormat
+				return nil, fmt.Errorf("some unexpected files '%v' found on %s: %w",
+					vols, disk, errCorruptedFormat)
 			}
 			// No other data found, its a fresh disk.
 			return nil, errUnformattedDisk
@@ -490,7 +478,8 @@ func formatErasureGetDeploymentID(refFormat *formatErasureV3, formats []*formatE
 			} else if deploymentID != format.ID {
 				// DeploymentID found earlier doesn't match with the
 				// current format.json's ID.
-				return "", errCorruptedFormat
+				return "", fmt.Errorf("Deployment IDs do not match expected %s, got %s: %w",
+					deploymentID, format.ID, errCorruptedFormat)
 			}
 		}
 	}
@@ -500,14 +489,7 @@ func formatErasureGetDeploymentID(refFormat *formatErasureV3, formats []*formatE
 // formatErasureFixDeploymentID - Add deployment id if it is not present.
 func formatErasureFixDeploymentID(endpoints Endpoints, storageDisks []StorageAPI, refFormat *formatErasureV3) (err error) {
 	// Attempt to load all `format.json` from all disks.
-	var sErrs []error
-	formats, sErrs := loadFormatErasureAll(storageDisks, false)
-	for i, sErr := range sErrs {
-		if _, ok := formatCriticalErrors[sErr]; ok {
-			return config.ErrCorruptedBackend(err).Hint(fmt.Sprintf("Clear any pre-existing content on %s", endpoints[i]))
-		}
-	}
-
+	formats, _ := loadFormatErasureAll(storageDisks, false)
 	for index := range formats {
 		// If the Erasure sets do not match, set those formats to nil,
 		// We do not have to update the ID on those format.json file.
@@ -515,6 +497,7 @@ func formatErasureFixDeploymentID(endpoints Endpoints, storageDisks []StorageAPI
 			formats[index] = nil
 		}
 	}
+
 	refFormat.ID, err = formatErasureGetDeploymentID(refFormat, formats)
 	if err != nil {
 		return err

cmd/format-erasure_test.go

@@ -18,6 +18,7 @@ package cmd
 
 import (
 	"encoding/json"
+	"errors"
 	"io/ioutil"
 	"os"
 	"reflect"
@@ -436,8 +437,8 @@ func TestGetErasureID(t *testing.T) {
 	}
 
 	formats[2].ID = "bad-id"
-	if _, err = formatErasureGetDeploymentID(quorumFormat, formats); err != errCorruptedFormat {
-		t.Fatal("Unexpected Success")
+	if _, err = formatErasureGetDeploymentID(quorumFormat, formats); !errors.Is(err, errCorruptedFormat) {
+		t.Fatalf("Unexpect error %s", err)
 	}
 }
 

cmd/prepare-storage.go

@@ -27,7 +27,6 @@ import (
 	"time"
 
 	"github.com/dustin/go-humanize"
-	"github.com/minio/minio/cmd/config"
 	xhttp "github.com/minio/minio/cmd/http"
 	"github.com/minio/minio/cmd/logger"
 	"github.com/minio/minio/pkg/sync/errgroup"
@@ -253,10 +252,7 @@ func connectLoadInitFormats(retryCount int, firstDisk bool, endpoints Endpoints,
 	formatConfigs, sErrs := loadFormatErasureAll(storageDisks, false)
 	// Check if we have
 	for i, sErr := range sErrs {
-		if _, ok := formatCriticalErrors[sErr]; ok {
-			return nil, nil, config.ErrCorruptedBackend(err).Hint(fmt.Sprintf("Clear any pre-existing content on %s", endpoints[i]))
-		}
-		// not critical error but still print the error, nonetheless, which is perhaps unhandled
+		// print the error, nonetheless, which is perhaps unhandled
 		if sErr != errUnformattedDisk && sErr != errDiskNotFound && retryCount >= 5 {
 			if sErr != nil {
 				logger.Info("Unable to read 'format.json' from %s: %v\n", endpoints[i], sErr)

cmd/storage-errors.go

@@ -19,10 +19,10 @@ package cmd
 import "os"
 
 // errUnexpected - unexpected error, requires manual intervention.
-var errUnexpected = StorageErr("Unexpected error, please report this issue at https://github.com/minio/minio/issues")
+var errUnexpected = StorageErr("unexpected error, please report this issue at https://github.com/minio/minio/issues")
 
 // errCorruptedFormat - corrupted backend format.
-var errCorruptedFormat = StorageErr("corrupted backend format, please join https://slack.min.io for assistance")
+var errCorruptedFormat = StorageErr("corrupted backend format, specified disk mount has unexpected previous content")
 
 // errUnformattedDisk - unformatted disk found.
 var errUnformattedDisk = StorageErr("unformatted disk found")

cmd/xl-storage.go

@@ -505,6 +505,7 @@ func (s *xlStorage) GetDiskID() (string, error) {
 		// Somebody else got the lock first.
 		return diskID, nil
 	}
+
 	formatFile := pathJoin(s.diskPath, minioMetaBucket, formatConfigFile)
 	fi, err := os.Stat(formatFile)
 	if err != nil {
@@ -520,8 +521,12 @@ func (s *xlStorage) GetDiskID() (string, error) {
 			} else if os.IsPermission(err) {
 				return "", errDiskAccessDenied
 			}
-			return "", err
+			logger.LogIf(GlobalContext, err) // log unexpected errors
+			return "", errCorruptedFormat
+		} else if os.IsPermission(err) {
+			return "", errDiskAccessDenied
 		}
+		logger.LogIf(GlobalContext, err) // log unexpected errors
 		return "", errCorruptedFormat
 	}
 
@@ -533,13 +538,34 @@ func (s *xlStorage) GetDiskID() (string, error) {
 
 	b, err := ioutil.ReadFile(formatFile)
 	if err != nil {
+		// If the disk is still not initialized.
+		if os.IsNotExist(err) {
+			_, err = os.Stat(s.diskPath)
+			if err == nil {
+				// Disk is present but missing `format.json`
+				return "", errUnformattedDisk
+			}
+			if os.IsNotExist(err) {
+				return "", errDiskNotFound
+			} else if os.IsPermission(err) {
+				return "", errDiskAccessDenied
+			}
+			logger.LogIf(GlobalContext, err) // log unexpected errors
+			return "", errCorruptedFormat
+		} else if os.IsPermission(err) {
+			return "", errDiskAccessDenied
+		}
+		logger.LogIf(GlobalContext, err) // log unexpected errors
 		return "", errCorruptedFormat
 	}
+
 	format := &formatErasureV3{}
 	var json = jsoniter.ConfigCompatibleWithStandardLibrary
 	if err = json.Unmarshal(b, &format); err != nil {
+		logger.LogIf(GlobalContext, err) // log unexpected errors
 		return "", errCorruptedFormat
 	}
+
 	s.diskID = format.Erasure.This
 	s.formatFileInfo = fi
 	s.formatLastCheck = time.Now()