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/*
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* Minio Cloud Storage, (C) 2016 Minio, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package cmd
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import (
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"context"
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"fmt"
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"path"
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"sync"
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"github.com/minio/minio/pkg/errors"
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"github.com/minio/minio/pkg/madmin"
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)
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func (xl xlObjects) HealFormat(ctx context.Context, dryRun bool) (madmin.HealResultItem, error) {
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return madmin.HealResultItem{}, errors.Trace(NotImplemented{})
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}
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// Heals a bucket if it doesn't exist on one of the disks, additionally
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// also heals the missing entries for bucket metadata files
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// `policy.json, notification.xml, listeners.json`.
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func (xl xlObjects) HealBucket(ctx context.Context, bucket string, dryRun bool) (
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results []madmin.HealResultItem, err error) {
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if err = checkBucketExist(bucket, xl); err != nil {
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return nil, err
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}
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// get write quorum for an object
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writeQuorum := len(xl.getDisks())/2 + 1
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// Heal bucket.
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var result madmin.HealResultItem
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result, err = healBucket(xl.getDisks(), bucket, writeQuorum, dryRun)
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if err != nil {
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return nil, err
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}
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results = append(results, result)
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// Proceed to heal bucket metadata.
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metaResults, err := healBucketMetadata(xl, bucket, dryRun)
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results = append(results, metaResults...)
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return results, err
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}
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// Heal bucket - create buckets on disks where it does not exist.
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func healBucket(storageDisks []StorageAPI, bucket string, writeQuorum int,
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dryRun bool) (res madmin.HealResultItem, err error) {
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// Initialize sync waitgroup.
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var wg = &sync.WaitGroup{}
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// Initialize list of errors.
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var dErrs = make([]error, len(storageDisks))
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// Disk states slices
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beforeState := make([]string, len(storageDisks))
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afterState := make([]string, len(storageDisks))
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// Make a volume entry on all underlying storage disks.
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for index, disk := range storageDisks {
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if disk == nil {
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dErrs[index] = errors.Trace(errDiskNotFound)
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beforeState[index] = madmin.DriveStateOffline
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afterState[index] = madmin.DriveStateOffline
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continue
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}
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wg.Add(1)
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// Make a volume inside a go-routine.
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go func(index int, disk StorageAPI) {
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defer wg.Done()
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if _, err := disk.StatVol(bucket); err != nil {
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if errors.Cause(err) == errDiskNotFound {
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beforeState[index] = madmin.DriveStateOffline
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afterState[index] = madmin.DriveStateOffline
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dErrs[index] = err
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return
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}
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if errors.Cause(err) != errVolumeNotFound {
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beforeState[index] = madmin.DriveStateCorrupt
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afterState[index] = madmin.DriveStateCorrupt
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dErrs[index] = err
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return
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}
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beforeState[index] = madmin.DriveStateMissing
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afterState[index] = madmin.DriveStateMissing
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// mutate only if not a dry-run
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if dryRun {
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return
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}
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makeErr := disk.MakeVol(bucket)
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dErrs[index] = makeErr
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if makeErr == nil {
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afterState[index] = madmin.DriveStateOk
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}
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return
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}
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beforeState[index] = madmin.DriveStateOk
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afterState[index] = madmin.DriveStateOk
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}(index, disk)
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}
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// Wait for all make vol to finish.
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wg.Wait()
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// Initialize heal result info
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res = madmin.HealResultItem{
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Type: madmin.HealItemBucket,
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Bucket: bucket,
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DiskCount: len(storageDisks),
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}
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for i, before := range beforeState {
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if storageDisks[i] == nil {
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res.Before.Drives = append(res.Before.Drives, madmin.HealDriveInfo{
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UUID: "",
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Endpoint: "",
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State: before,
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})
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res.After.Drives = append(res.After.Drives, madmin.HealDriveInfo{
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UUID: "",
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Endpoint: "",
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State: afterState[i],
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})
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continue
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}
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drive := storageDisks[i].String()
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res.Before.Drives = append(res.Before.Drives, madmin.HealDriveInfo{
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UUID: "",
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Endpoint: drive,
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State: before,
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})
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res.After.Drives = append(res.After.Drives, madmin.HealDriveInfo{
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UUID: "",
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Endpoint: drive,
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State: afterState[i],
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})
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}
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reducedErr := reduceWriteQuorumErrs(dErrs, bucketOpIgnoredErrs, writeQuorum)
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if errors.Cause(reducedErr) == errXLWriteQuorum {
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// Purge successfully created buckets if we don't have writeQuorum.
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undoMakeBucket(storageDisks, bucket)
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}
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return res, reducedErr
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}
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// Heals all the metadata associated for a given bucket, this function
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// heals `policy.json`, `notification.xml` and `listeners.json`.
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func healBucketMetadata(xl xlObjects, bucket string, dryRun bool) (
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results []madmin.HealResultItem, err error) {
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healBucketMetaFn := func(metaPath string) error {
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result, healErr := xl.HealObject(nil, minioMetaBucket, metaPath, dryRun)
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// If object is not found, no result to add.
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if isErrObjectNotFound(healErr) {
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return nil
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}
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if healErr != nil {
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return healErr
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}
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result.Type = madmin.HealItemBucketMetadata
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results = append(results, result)
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return nil
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}
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// Heal `policy.json` for missing entries, ignores if
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// `policy.json` is not found.
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policyPath := pathJoin(bucketConfigPrefix, bucket, bucketPolicyConfig)
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err = healBucketMetaFn(policyPath)
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if err != nil {
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return results, err
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}
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// Heal `notification.xml` for missing entries, ignores if
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// `notification.xml` is not found.
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nConfigPath := path.Join(bucketConfigPrefix, bucket,
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bucketNotificationConfig)
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err = healBucketMetaFn(nConfigPath)
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if err != nil {
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return results, err
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}
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// Heal `listeners.json` for missing entries, ignores if
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// `listeners.json` is not found.
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lConfigPath := path.Join(bucketConfigPrefix, bucket, bucketListenerConfig)
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err = healBucketMetaFn(lConfigPath)
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return results, err
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}
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// listAllBuckets lists all buckets from all disks. It also
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// returns the occurrence of each buckets in all disks
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func listAllBuckets(storageDisks []StorageAPI) (buckets map[string]VolInfo,
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bucketsOcc map[string]int, err error) {
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buckets = make(map[string]VolInfo)
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bucketsOcc = make(map[string]int)
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for _, disk := range storageDisks {
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if disk == nil {
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continue
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}
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var volsInfo []VolInfo
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volsInfo, err = disk.ListVols()
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if err != nil {
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if errors.IsErrIgnored(err, bucketMetadataOpIgnoredErrs...) {
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continue
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}
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return nil, nil, err
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}
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for _, volInfo := range volsInfo {
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// StorageAPI can send volume names which are
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// incompatible with buckets - these are
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// skipped, like the meta-bucket.
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if !IsValidBucketName(volInfo.Name) ||
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isMinioMetaBucketName(volInfo.Name) {
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continue
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}
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// Increase counter per bucket name
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bucketsOcc[volInfo.Name]++
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// Save volume info under bucket name
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buckets[volInfo.Name] = volInfo
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}
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}
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return buckets, bucketsOcc, nil
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}
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// Heals an object by re-writing corrupt/missing erasure blocks.
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func healObject(storageDisks []StorageAPI, bucket string, object string,
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quorum int, dryRun bool) (result madmin.HealResultItem, err error) {
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partsMetadata, errs := readAllXLMetadata(storageDisks, bucket, object)
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// readQuorum suffices for xl.json since we use monotonic
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// system time to break the tie when a split-brain situation
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// arises.
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if reducedErr := reduceReadQuorumErrs(errs, nil, quorum); reducedErr != nil {
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return result, toObjectErr(reducedErr, bucket, object)
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}
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// List of disks having latest version of the object xl.json
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// (by modtime).
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latestDisks, modTime := listOnlineDisks(storageDisks, partsMetadata, errs)
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// List of disks having all parts as per latest xl.json.
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availableDisks, dataErrs, aErr := disksWithAllParts(latestDisks, partsMetadata, errs, bucket, object)
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if aErr != nil {
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return result, toObjectErr(aErr, bucket, object)
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}
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// Initialize heal result object
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result = madmin.HealResultItem{
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Type: madmin.HealItemObject,
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Bucket: bucket,
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Object: object,
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DiskCount: len(storageDisks),
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// Initialize object size to -1, so we can detect if we are
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// unable to reliably find the object size.
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ObjectSize: -1,
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}
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// Loop to find number of disks with valid data, per-drive
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// data state and a list of outdated disks on which data needs
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// to be healed.
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outDatedDisks := make([]StorageAPI, len(storageDisks))
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numAvailableDisks := 0
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disksToHealCount := 0
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for i, v := range availableDisks {
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driveState := ""
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switch {
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case v != nil:
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driveState = madmin.DriveStateOk
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numAvailableDisks++
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// If data is sane on any one disk, we can
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// extract the correct object size.
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result.ObjectSize = partsMetadata[i].Stat.Size
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result.ParityBlocks = partsMetadata[i].Erasure.ParityBlocks
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result.DataBlocks = partsMetadata[i].Erasure.DataBlocks
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case errors.Cause(errs[i]) == errDiskNotFound:
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driveState = madmin.DriveStateOffline
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case errors.Cause(errs[i]) == errFileNotFound, errors.Cause(errs[i]) == errVolumeNotFound:
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fallthrough
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case errors.Cause(dataErrs[i]) == errFileNotFound, errors.Cause(dataErrs[i]) == errVolumeNotFound:
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driveState = madmin.DriveStateMissing
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default:
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// all remaining cases imply corrupt data/metadata
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driveState = madmin.DriveStateCorrupt
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}
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// an online disk without valid data/metadata is
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// outdated and can be healed.
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if errs[i] != errDiskNotFound && v == nil {
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outDatedDisks[i] = storageDisks[i]
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disksToHealCount++
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}
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if v == nil {
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result.Before.Drives = append(result.Before.Drives, madmin.HealDriveInfo{
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UUID: "",
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Endpoint: "",
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State: driveState,
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})
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result.After.Drives = append(result.After.Drives, madmin.HealDriveInfo{
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UUID: "",
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Endpoint: "",
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State: driveState,
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})
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continue
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}
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drive := v.String()
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result.Before.Drives = append(result.Before.Drives, madmin.HealDriveInfo{
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UUID: "",
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Endpoint: drive,
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State: driveState,
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})
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result.After.Drives = append(result.After.Drives, madmin.HealDriveInfo{
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UUID: "",
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Endpoint: drive,
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State: driveState,
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})
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}
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// If less than read quorum number of disks have all the parts
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// of the data, we can't reconstruct the erasure-coded data.
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if numAvailableDisks < quorum {
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return result, toObjectErr(errXLReadQuorum, bucket, object)
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}
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if disksToHealCount == 0 {
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// Nothing to heal!
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return result, nil
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}
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// After this point, only have to repair data on disk - so
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// return if it is a dry-run
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if dryRun {
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return result, nil
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}
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// Latest xlMetaV1 for reference. If a valid metadata is not
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// present, it is as good as object not found.
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latestMeta, pErr := pickValidXLMeta(partsMetadata, modTime)
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if pErr != nil {
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return result, toObjectErr(pErr, bucket, object)
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}
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// Clear data files of the object on outdated disks
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for _, disk := range outDatedDisks {
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// Before healing outdated disks, we need to remove
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// xl.json and part files from "bucket/object/" so
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// that rename(minioMetaBucket, "tmp/tmpuuid/",
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// "bucket", "object/") succeeds.
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if disk == nil {
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// Not an outdated disk.
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continue
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}
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// List and delete the object directory, ignoring
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// errors.
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files, derr := disk.ListDir(bucket, object)
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if derr == nil {
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for _, entry := range files {
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_ = disk.DeleteFile(bucket,
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pathJoin(object, entry))
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|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
// Reorder so that we have data disks first and parity disks next.
|
|
|
|
latestDisks = shuffleDisks(latestDisks, latestMeta.Erasure.Distribution)
|
|
|
|
outDatedDisks = shuffleDisks(outDatedDisks, latestMeta.Erasure.Distribution)
|
|
|
|
partsMetadata = shufflePartsMetadata(partsMetadata, latestMeta.Erasure.Distribution)
|
|
|
|
|
|
|
|
// We write at temporary location and then rename to final location.
|
|
|
|
tmpID := mustGetUUID()
|
|
|
|
|
|
|
|
// Checksum of the part files. checkSumInfos[index] will
|
|
|
|
// contain checksums of all the part files in the
|
|
|
|
// outDatedDisks[index]
|
|
|
|
checksumInfos := make([][]ChecksumInfo, len(outDatedDisks))
|
|
|
|
|
|
|
|
// Heal each part. erasureHealFile() will write the healed
|
|
|
|
// part to .minio/tmp/uuid/ which needs to be renamed later to
|
|
|
|
// the final location.
|
|
|
|
storage, err := NewErasureStorage(latestDisks, latestMeta.Erasure.DataBlocks,
|
|
|
|
latestMeta.Erasure.ParityBlocks, latestMeta.Erasure.BlockSize)
|
|
|
|
if err != nil {
|
|
|
|
return result, toObjectErr(err, bucket, object)
|
|
|
|
}
|
|
|
|
checksums := make([][]byte, len(latestDisks))
|
|
|
|
for partIndex := 0; partIndex < len(latestMeta.Parts); partIndex++ {
|
|
|
|
partName := latestMeta.Parts[partIndex].Name
|
|
|
|
partSize := latestMeta.Parts[partIndex].Size
|
|
|
|
erasure := latestMeta.Erasure
|
|
|
|
var algorithm BitrotAlgorithm
|
|
|
|
for i, disk := range storage.disks {
|
|
|
|
if disk != OfflineDisk {
|
|
|
|
info := partsMetadata[i].Erasure.GetChecksumInfo(partName)
|
|
|
|
algorithm = info.Algorithm
|
|
|
|
checksums[i] = info.Hash
|
|
|
|
}
|
|
|
|
}
|
|
|
|
// Heal the part file.
|
|
|
|
file, hErr := storage.HealFile(outDatedDisks, bucket, pathJoin(object, partName),
|
|
|
|
erasure.BlockSize, minioMetaTmpBucket, pathJoin(tmpID, partName), partSize,
|
|
|
|
algorithm, checksums)
|
|
|
|
if hErr != nil {
|
|
|
|
return result, toObjectErr(hErr, bucket, object)
|
|
|
|
}
|
|
|
|
// outDatedDisks that had write errors should not be
|
|
|
|
// written to for remaining parts, so we nil it out.
|
|
|
|
for i, disk := range outDatedDisks {
|
|
|
|
if disk == nil {
|
|
|
|
continue
|
|
|
|
}
|
|
|
|
// A non-nil stale disk which did not receive
|
|
|
|
// a healed part checksum had a write error.
|
|
|
|
if file.Checksums[i] == nil {
|
|
|
|
outDatedDisks[i] = nil
|
|
|
|
disksToHealCount--
|
|
|
|
continue
|
|
|
|
}
|
|
|
|
// append part checksums
|
|
|
|
checksumInfos[i] = append(checksumInfos[i],
|
|
|
|
ChecksumInfo{partName, file.Algorithm, file.Checksums[i]})
|
|
|
|
}
|
|
|
|
|
|
|
|
// If all disks are having errors, we give up.
|
|
|
|
if disksToHealCount == 0 {
|
|
|
|
return result, fmt.Errorf("all disks without up-to-date data had write errors")
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
// xl.json should be written to all the healed disks.
|
|
|
|
for index, disk := range outDatedDisks {
|
|
|
|
if disk == nil {
|
|
|
|
continue
|
|
|
|
}
|
|
|
|
partsMetadata[index] = latestMeta
|
|
|
|
partsMetadata[index].Erasure.Checksums = checksumInfos[index]
|
|
|
|
}
|
|
|
|
|
|
|
|
// Generate and write `xl.json` generated from other disks.
|
|
|
|
outDatedDisks, aErr = writeUniqueXLMetadata(outDatedDisks, minioMetaTmpBucket, tmpID,
|
|
|
|
partsMetadata, diskCount(outDatedDisks))
|
|
|
|
if aErr != nil {
|
|
|
|
return result, toObjectErr(aErr, bucket, object)
|
|
|
|
}
|
|
|
|
|
|
|
|
// Rename from tmp location to the actual location.
|
|
|
|
for diskIndex, disk := range outDatedDisks {
|
|
|
|
if disk == nil {
|
|
|
|
continue
|
|
|
|
}
|
|
|
|
|
|
|
|
// Attempt a rename now from healed data to final location.
|
|
|
|
aErr = disk.RenameFile(minioMetaTmpBucket, retainSlash(tmpID), bucket,
|
|
|
|
retainSlash(object))
|
|
|
|
if aErr != nil {
|
|
|
|
return result, toObjectErr(errors.Trace(aErr), bucket, object)
|
|
|
|
}
|
|
|
|
|
|
|
|
realDiskIdx := unshuffleIndex(diskIndex, latestMeta.Erasure.Distribution)
|
|
|
|
if outDatedDisks[realDiskIdx] != nil {
|
|
|
|
for i, v := range result.After.Drives {
|
|
|
|
if v.Endpoint == outDatedDisks[realDiskIdx].String() {
|
|
|
|
result.After.Drives[i].State = madmin.DriveStateOk
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
// Set the size of the object in the heal result
|
|
|
|
result.ObjectSize = latestMeta.Stat.Size
|
|
|
|
|
|
|
|
return result, nil
|
|
|
|
}
|
|
|
|
|
|
|
|
// HealObject - heal the given object.
|
|
|
|
//
|
|
|
|
// FIXME: If an object object was deleted and one disk was down,
|
|
|
|
// and later the disk comes back up again, heal on the object
|
|
|
|
// should delete it.
|
|
|
|
func (xl xlObjects) HealObject(ctx context.Context, bucket, object string, dryRun bool) (hr madmin.HealResultItem, err error) {
|
|
|
|
|
|
|
|
// FIXME: Metadata is read again in the healObject() call below.
|
|
|
|
// Read metadata files from all the disks
|
|
|
|
partsMetadata, errs := readAllXLMetadata(xl.getDisks(), bucket, object)
|
|
|
|
|
|
|
|
// get read quorum for this object
|
|
|
|
var readQuorum int
|
|
|
|
readQuorum, _, err = objectQuorumFromMeta(xl, partsMetadata, errs)
|
|
|
|
if err != nil {
|
|
|
|
return hr, err
|
|
|
|
}
|
|
|
|
|
|
|
|
// Lock the object before healing.
|
|
|
|
objectLock := xl.nsMutex.NewNSLock(bucket, object)
|
|
|
|
if lerr := objectLock.GetRLock(globalHealingTimeout); lerr != nil {
|
|
|
|
return hr, lerr
|
|
|
|
}
|
|
|
|
defer objectLock.RUnlock()
|
|
|
|
|
|
|
|
// Heal the object.
|
|
|
|
return healObject(xl.getDisks(), bucket, object, readQuorum, dryRun)
|
|
|
|
}
|