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Revamp bucket metadata healing (#7208)

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Bucket metadata healing in the current code was executed multiple
times each time for a given set. Bucket metadata just like
objects are hashed in accordance with its name on any given set,
to allow hashing to play a role we should let the top level
code decide where to navigate.

Current code also had 3 bucket metadata files hardcoded, whereas
we should make it generic by listing and navigating the .minio.sys
to heal such objects.

We also had another bug where due to isObjectDangling changes
without pre-existing bucket metadata files, we were erroneously
reporting it as grey/corrupted objects.

This PR fixes all of the above items.
This commit is contained in:
Harshavardhana 2019-02-10 19:53:13 -08:00 committed by Nitish Tiwari
parent 9600e2b35e
commit 082f777281
7 changed files with 96 additions and 154 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

133
cmd/admin-heal-ops.go
View File

@ -546,8 +546,11 @@ func (h *healSequence) traverseAndHeal() {
// Start with format healing
checkErr(h.healDiskFormat)
// Start healing the config.
checkErr(h.healConfig)
// Start healing the config prefix.
checkErr(h.healMinioSysMeta(minioConfigPrefix))
// Start healing the bucket config prefix.
checkErr(h.healMinioSysMeta(bucketConfigPrefix))
// Heal buckets and objects
checkErr(h.healBuckets)
@ -559,63 +562,65 @@ func (h *healSequence) traverseAndHeal() {
close(h.traverseAndHealDoneCh)
}
// healConfig - heals config.json, retrun value indicates if a failure occurred.
func (h *healSequence) healConfig() error {
// Get current object layer instance.
objectAPI := newObjectLayerFn()
if objectAPI == nil {
return errServerNotInitialized
// healMinioSysMeta - heals all files under a given meta prefix, returns a function
// which in-turn heals the respective meta directory path and any files in int.
func (h *healSequence) healMinioSysMeta(metaPrefix string) func() error {
return func() error {
// Get current object layer instance.
objectAPI := newObjectLayerFn()
if objectAPI == nil {
return errServerNotInitialized
}
// NOTE: Healing on meta is run regardless
// of any bucket being selected, this is to ensure that
// meta are always upto date and correct.
marker := ""
isTruncated := true
for isTruncated {
if globalHTTPServer != nil {
// Wait at max 1 minute for an inprogress request
// before proceeding to heal
waitCount := 60
// Any requests in progress, delay the heal.
for globalHTTPServer.GetRequestCount() > 2 && waitCount > 0 {
waitCount--
time.Sleep(1 * time.Second)
}
}
// Lists all objects under `config` prefix.
objectInfos, err := objectAPI.ListObjectsHeal(h.ctx, minioMetaBucket, metaPrefix,
marker, "", 1000)
if err != nil {
return errFnHealFromAPIErr(h.ctx, err)
}
for index := range objectInfos.Objects {
if h.isQuitting() {
return errHealStopSignalled
}
o := objectInfos.Objects[index]
res, herr := objectAPI.HealObject(h.ctx, o.Bucket, o.Name, h.settings.DryRun, h.settings.Remove)
// Object might have been deleted, by the time heal
// was attempted we ignore this file an move on.
if isErrObjectNotFound(herr) {
continue
}
if herr != nil {
return herr
}
res.Type = madmin.HealItemBucketMetadata
if err = h.pushHealResultItem(res); err != nil {
return err
}
}
isTruncated = objectInfos.IsTruncated
marker = objectInfos.NextMarker
}
return nil
}
// NOTE: Healing on configs is run regardless
// of any bucket being selected, this is to ensure that
// configs are always uptodate and correct.
marker := ""
isTruncated := true
for isTruncated {
if globalHTTPServer != nil {
// Wait at max 1 minute for an inprogress request
// before proceeding to heal
waitCount := 60
// Any requests in progress, delay the heal.
for globalHTTPServer.GetRequestCount() > 2 && waitCount > 0 {
waitCount--
time.Sleep(1 * time.Second)
}
}
// Lists all objects under `config` prefix.
objectInfos, err := objectAPI.ListObjectsHeal(h.ctx, minioMetaBucket, minioConfigPrefix,
marker, "", 1000)
if err != nil {
return errFnHealFromAPIErr(h.ctx, err)
}
for index := range objectInfos.Objects {
if h.isQuitting() {
return errHealStopSignalled
}
o := objectInfos.Objects[index]
res, herr := objectAPI.HealObject(h.ctx, o.Bucket, o.Name, h.settings.DryRun, h.settings.Remove)
// Object might have been deleted, by the time heal
// was attempted we ignore this file an move on.
if isErrObjectNotFound(herr) {
continue
}
if herr != nil {
return herr
}
res.Type = madmin.HealItemBucketMetadata
if err = h.pushHealResultItem(res); err != nil {
return err
}
}
isTruncated = objectInfos.IsTruncated
marker = objectInfos.NextMarker
}
return nil
}
// healDiskFormat - heals format.json, return value indicates if a
@ -692,18 +697,16 @@ func (h *healSequence) healBucket(bucket string) error {
return errServerNotInitialized
}
results, err := objectAPI.HealBucket(h.ctx, bucket, h.settings.DryRun, h.settings.Remove)
// push any available results before checking for error
for _, result := range results {
if perr := h.pushHealResultItem(result); perr != nil {
return perr
}
}
result, err := objectAPI.HealBucket(h.ctx, bucket, h.settings.DryRun, h.settings.Remove)
// handle heal-bucket error
if err != nil {
return err
}
if err = h.pushHealResultItem(result); err != nil {
return err
}
if !h.settings.Recursive {
if h.objPrefix != "" {
// Check if an object named as the objPrefix exists,

2
cmd/dummy-object-layer_test.go
View File

@ -119,7 +119,7 @@ func (api *DummyObjectLayer) HealFormat(ctx context.Context, dryRun bool) (item
return
}
func (api *DummyObjectLayer) HealBucket(ctx context.Context, bucket string, dryRun, remove bool) (items []madmin.HealResultItem, err error) {
func (api *DummyObjectLayer) HealBucket(ctx context.Context, bucket string, dryRun, remove bool) (items madmin.HealResultItem, err error) {
return
}

4
cmd/fs-v1.go
View File

@ -1252,10 +1252,10 @@ func (fs *FSObjects) HealObject(ctx context.Context, bucket, object string, dryR
}
// HealBucket - no-op for fs, Valid only for XL.
func (fs *FSObjects) HealBucket(ctx context.Context, bucket string, dryRun, remove bool) ([]madmin.HealResultItem,
func (fs *FSObjects) HealBucket(ctx context.Context, bucket string, dryRun, remove bool) (madmin.HealResultItem,
error) {
logger.LogIf(ctx, NotImplemented{})
return nil, NotImplemented{}
return madmin.HealResultItem{}, NotImplemented{}
}
// ListObjectsHeal - list all objects to be healed. Valid only for XL

4
cmd/gateway-unsupported.go
View File

@ -92,8 +92,8 @@ func (a GatewayUnsupported) HealFormat(ctx context.Context, dryRun bool) (madmin
}
// HealBucket - Not implemented stub
func (a GatewayUnsupported) HealBucket(ctx context.Context, bucket string, dryRun, remove bool) ([]madmin.HealResultItem, error) {
return nil, NotImplemented{}
func (a GatewayUnsupported) HealBucket(ctx context.Context, bucket string, dryRun, remove bool) (madmin.HealResultItem, error) {
return madmin.HealResultItem{}, NotImplemented{}
}
// ListBucketsHeal - Not implemented stub

2
cmd/object-api-interface.go
View File

@ -83,7 +83,7 @@ type ObjectLayer interface {
// Healing operations.
ReloadFormat(ctx context.Context, dryRun bool) error
HealFormat(ctx context.Context, dryRun bool) (madmin.HealResultItem, error)
HealBucket(ctx context.Context, bucket string, dryRun, remove bool) ([]madmin.HealResultItem, error)
HealBucket(ctx context.Context, bucket string, dryRun, remove bool) (madmin.HealResultItem, error)
HealObject(ctx context.Context, bucket, object string, dryRun, remove bool) (madmin.HealResultItem, error)
ListBucketsHeal(ctx context.Context) (buckets []BucketInfo, err error)
ListObjectsHeal(ctx context.Context, bucket, prefix, marker, delimiter string, maxKeys int) (ListObjectsInfo, error)

45
cmd/xl-sets.go
View File

@ -1232,15 +1232,15 @@ func (s *xlSets) HealFormat(ctx context.Context, dryRun bool) (res madmin.HealRe
}
// HealBucket - heals inconsistent buckets and bucket metadata on all sets.
func (s *xlSets) HealBucket(ctx context.Context, bucket string, dryRun, remove bool) (results []madmin.HealResultItem, err error) {
func (s *xlSets) HealBucket(ctx context.Context, bucket string, dryRun, remove bool) (result madmin.HealResultItem, err error) {
bucketLock := globalNSMutex.NewNSLock(bucket, "")
if err := bucketLock.GetLock(globalHealingTimeout); err != nil {
return nil, err
return result, err
}
defer bucketLock.Unlock()
// Initialize heal result info
res := madmin.HealResultItem{
result = madmin.HealResultItem{
Type: madmin.HealItemBucket,
Bucket: bucket,
DiskCount: s.setCount * s.drivesPerSet,
@ -1248,25 +1248,22 @@ func (s *xlSets) HealBucket(ctx context.Context, bucket string, dryRun, remove b
}
for _, s := range s.sets {
var setResults []madmin.HealResultItem
setResults, _ = s.HealBucket(ctx, bucket, dryRun, remove)
for _, setResult := range setResults {
if setResult.Type == madmin.HealItemBucket {
for _, v := range setResult.Before.Drives {
res.Before.Drives = append(res.Before.Drives, v)
}
for _, v := range setResult.After.Drives {
res.After.Drives = append(res.After.Drives, v)
}
continue
}
results = append(results, setResult)
var healResult madmin.HealResultItem
healResult, err = s.HealBucket(ctx, bucket, dryRun, remove)
if err != nil {
return result, err
}
for _, v := range healResult.Before.Drives {
result.Before.Drives = append(result.Before.Drives, v)
}
for _, v := range healResult.After.Drives {
result.After.Drives = append(result.After.Drives, v)
}
}
for _, endpoint := range s.endpoints {
var foundBefore bool
for _, v := range res.Before.Drives {
for _, v := range result.Before.Drives {
if endpoint.IsLocal {
if v.Endpoint == endpoint.Path {
foundBefore = true
@ -1278,14 +1275,14 @@ func (s *xlSets) HealBucket(ctx context.Context, bucket string, dryRun, remove b
}
}
if !foundBefore {
res.Before.Drives = append(res.Before.Drives, madmin.HealDriveInfo{
result.Before.Drives = append(result.Before.Drives, madmin.HealDriveInfo{
UUID: "",
Endpoint: endpoint.String(),
State: madmin.DriveStateOffline,
})
}
var foundAfter bool
for _, v := range res.After.Drives {
for _, v := range result.After.Drives {
if endpoint.IsLocal {
if v.Endpoint == endpoint.Path {
foundAfter = true
@ -1297,7 +1294,7 @@ func (s *xlSets) HealBucket(ctx context.Context, bucket string, dryRun, remove b
}
}
if !foundAfter {
res.After.Drives = append(res.After.Drives, madmin.HealDriveInfo{
result.After.Drives = append(result.After.Drives, madmin.HealDriveInfo{
UUID: "",
Endpoint: endpoint.String(),
State: madmin.DriveStateOffline,
@ -1306,14 +1303,12 @@ func (s *xlSets) HealBucket(ctx context.Context, bucket string, dryRun, remove b
}
// Check if we had quorum to write, if not return an appropriate error.
_, afterDriveOnline := res.GetOnlineCounts()
_, afterDriveOnline := result.GetOnlineCounts()
if afterDriveOnline < ((s.setCount*s.drivesPerSet)/2)+1 {
return nil, toObjectErr(errXLWriteQuorum, bucket)
return result, toObjectErr(errXLWriteQuorum, bucket)
}
results = append(results, res)
return results, nil
return result, nil
}
// HealObject - heals inconsistent object on a hashedSet based on object name.

60
cmd/xl-v1-healing.go
View File

@ -20,7 +20,6 @@ import (
"context"
"fmt"
"io"
"path"
"sync"
"time"
@ -42,7 +41,7 @@ func (xl xlObjects) HealFormat(ctx context.Context, dryRun bool) (madmin.HealRes
// also heals the missing entries for bucket metadata files
// `policy.json, notification.xml, listeners.json`.
func (xl xlObjects) HealBucket(ctx context.Context, bucket string, dryRun, remove bool) (
results []madmin.HealResultItem, err error) {
result madmin.HealResultItem, err error) {
storageDisks := xl.getDisks()
@ -50,17 +49,7 @@ func (xl xlObjects) HealBucket(ctx context.Context, bucket string, dryRun, remov
writeQuorum := len(storageDisks)/2 + 1
// Heal bucket.
var result madmin.HealResultItem
result, err = healBucket(ctx, storageDisks, bucket, writeQuorum, dryRun)
if err != nil {
return nil, err
}
results = append(results, result)
// Proceed to heal bucket metadata.
metaResults, err := healBucketMetadata(xl, bucket, dryRun, remove)
results = append(results, metaResults...)
return results, err
return healBucket(ctx, storageDisks, bucket, writeQuorum, dryRun)
}
// Heal bucket - create buckets on disks where it does not exist.
@ -157,51 +146,6 @@ func healBucket(ctx context.Context, storageDisks []StorageAPI, bucket string, w
return res, reducedErr
}
// Heals all the metadata associated for a given bucket, this function
// heals `policy.json`, `notification.xml` and `listeners.json`.
func healBucketMetadata(xl xlObjects, bucket string, dryRun, remove bool) (
results []madmin.HealResultItem, err error) {
healBucketMetaFn := func(metaPath string) error {
reqInfo := &logger.ReqInfo{BucketName: bucket}
ctx := logger.SetReqInfo(context.Background(), reqInfo)
result, healErr := xl.HealObject(ctx, minioMetaBucket, metaPath, dryRun, remove)
// If object is not found, skip the file.
if isErrObjectNotFound(healErr) {
return nil
}
if healErr != nil {
return healErr
}
result.Type = madmin.HealItemBucketMetadata
results = append(results, result)
return nil
}
// Heal `policy.json` for missing entries, ignores if
// `policy.json` is not found.
policyPath := pathJoin(bucketConfigPrefix, bucket, bucketPolicyConfig)
err = healBucketMetaFn(policyPath)
if err != nil {
return results, err
}
// Heal `notification.xml` for missing entries, ignores if
// `notification.xml` is not found.
nConfigPath := path.Join(bucketConfigPrefix, bucket,
bucketNotificationConfig)
err = healBucketMetaFn(nConfigPath)
if err != nil {
return results, err
}
// Heal `listeners.json` for missing entries, ignores if
// `listeners.json` is not found.
lConfigPath := path.Join(bucketConfigPrefix, bucket, bucketListenerConfig)
err = healBucketMetaFn(lConfigPath)
return results, err
}
// listAllBuckets lists all buckets from all disks. It also
// returns the occurrence of each buckets in all disks
func listAllBuckets(storageDisks []StorageAPI) (buckets map[string]VolInfo,