082f777281
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.
675 lines
21 KiB
Go
675 lines
21 KiB
Go
/*
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* Minio Cloud Storage, (C) 2016, 2017, 2018 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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"io"
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"sync"
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"time"
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"github.com/minio/minio/cmd/logger"
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"github.com/minio/minio/pkg/madmin"
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)
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func (xl xlObjects) ReloadFormat(ctx context.Context, dryRun bool) error {
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logger.LogIf(ctx, NotImplemented{})
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return NotImplemented{}
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}
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func (xl xlObjects) HealFormat(ctx context.Context, dryRun bool) (madmin.HealResultItem, error) {
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logger.LogIf(ctx, NotImplemented{})
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return madmin.HealResultItem{}, 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, remove bool) (
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result madmin.HealResultItem, err error) {
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storageDisks := xl.getDisks()
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// get write quorum for an object
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writeQuorum := len(storageDisks)/2 + 1
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// Heal bucket.
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return healBucket(ctx, storageDisks, bucket, writeQuorum, dryRun)
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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(ctx context.Context, 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] = 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 _, serr := disk.StatVol(bucket); serr != nil {
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if serr == errDiskNotFound {
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beforeState[index] = madmin.DriveStateOffline
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afterState[index] = madmin.DriveStateOffline
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dErrs[index] = serr
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return
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}
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if serr != errVolumeNotFound {
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beforeState[index] = madmin.DriveStateCorrupt
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afterState[index] = madmin.DriveStateCorrupt
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dErrs[index] = serr
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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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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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}
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reducedErr := reduceWriteQuorumErrs(ctx, dErrs, bucketOpIgnoredErrs, writeQuorum)
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if 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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// 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 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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// Only heal on disks where we are sure that healing is needed. We can expand
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// this list as and when we figure out more errors can be added to this list safely.
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func shouldHealObjectOnDisk(xlErr, dataErr error, meta xlMetaV1, quorumModTime time.Time) bool {
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switch xlErr {
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case errFileNotFound:
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return true
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case errCorruptedFormat:
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return true
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}
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if xlErr == nil {
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// If xl.json was read fine but there is some problem with the part.N files.
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if dataErr == errFileNotFound {
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return true
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}
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if _, ok := dataErr.(hashMismatchError); ok {
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return true
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}
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if quorumModTime != meta.Stat.ModTime {
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return true
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}
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}
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return false
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}
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// Heals an object by re-writing corrupt/missing erasure blocks.
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func healObject(ctx context.Context, 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(ctx, storageDisks, bucket, object)
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errCount := 0
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for _, err := range errs {
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if err != nil {
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errCount++
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}
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}
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if errCount == len(errs) {
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// Only if we get errors from all the disks we return error. Else we need to
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// continue to return filled madmin.HealResultItem struct which includes info
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// on what disks the file is available etc.
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if reducedErr := reduceReadQuorumErrs(ctx, errs, nil, quorum); reducedErr != nil {
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return defaultHealResult(storageDisks, errs, bucket, object), toObjectErr(reducedErr, bucket, object)
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}
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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 := disksWithAllParts(ctx, latestDisks, partsMetadata, errs, bucket, object)
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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 errs[i] == errDiskNotFound, dataErrs[i] == errDiskNotFound:
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driveState = madmin.DriveStateOffline
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case errs[i] == errFileNotFound, errs[i] == errVolumeNotFound:
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fallthrough
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case dataErrs[i] == errFileNotFound, 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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var drive string
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if storageDisks[i] != nil {
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drive = storageDisks[i].String()
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}
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if shouldHealObjectOnDisk(errs[i], dataErrs[i], partsMetadata[i], modTime) {
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outDatedDisks[i] = storageDisks[i]
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disksToHealCount++
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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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continue
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}
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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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// Default to most common configuration for erasure
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// blocks upon returning quorum error.
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result.ParityBlocks = len(storageDisks) / 2
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result.DataBlocks = len(storageDisks) / 2
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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(ctx, partsMetadata, modTime, quorum)
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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,
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files, derr := disk.ListDir(bucket, object, -1)
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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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}
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}
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}
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// Reorder so that we have data disks first and parity disks next.
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latestDisks = shuffleDisks(latestDisks, latestMeta.Erasure.Distribution)
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outDatedDisks = shuffleDisks(outDatedDisks, latestMeta.Erasure.Distribution)
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partsMetadata = shufflePartsMetadata(partsMetadata, latestMeta.Erasure.Distribution)
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for i := range outDatedDisks {
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if outDatedDisks[i] == nil {
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continue
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}
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partsMetadata[i] = newXLMetaFromXLMeta(latestMeta)
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}
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// We write at temporary location and then rename to final location.
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tmpID := mustGetUUID()
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// Heal each part. erasureHealFile() will write the healed
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// part to .minio/tmp/uuid/ which needs to be renamed later to
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// the final location.
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erasure, err := NewErasure(ctx, latestMeta.Erasure.DataBlocks,
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latestMeta.Erasure.ParityBlocks, latestMeta.Erasure.BlockSize)
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if err != nil {
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return result, toObjectErr(err, bucket, object)
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}
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erasureInfo := latestMeta.Erasure
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for partIndex := 0; partIndex < len(latestMeta.Parts); partIndex++ {
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partName := latestMeta.Parts[partIndex].Name
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partSize := latestMeta.Parts[partIndex].Size
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partActualSize := latestMeta.Parts[partIndex].ActualSize
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partNumber := latestMeta.Parts[partIndex].Number
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tillOffset := erasure.ShardFileTillOffset(0, partSize, partSize)
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readers := make([]io.ReaderAt, len(latestDisks))
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checksumAlgo := erasureInfo.GetChecksumInfo(partName).Algorithm
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for i, disk := range latestDisks {
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if disk == OfflineDisk {
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continue
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}
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checksumInfo := partsMetadata[i].Erasure.GetChecksumInfo(partName)
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readers[i] = newBitrotReader(disk, bucket, pathJoin(object, partName), tillOffset, checksumAlgo, checksumInfo.Hash, erasure.ShardSize())
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}
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writers := make([]io.Writer, len(outDatedDisks))
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for i, disk := range outDatedDisks {
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if disk == OfflineDisk {
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continue
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}
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writers[i] = newBitrotWriter(disk, minioMetaTmpBucket, pathJoin(tmpID, partName), tillOffset, checksumAlgo, erasure.ShardSize())
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}
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hErr := erasure.Heal(ctx, readers, writers, partSize)
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closeBitrotReaders(readers)
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closeBitrotWriters(writers)
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if hErr != nil {
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return result, toObjectErr(hErr, bucket, object)
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}
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// outDatedDisks that had write errors should not be
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// written to for remaining parts, so we nil it out.
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for i, disk := range outDatedDisks {
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if disk == nil {
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continue
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}
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// A non-nil stale disk which did not receive
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// a healed part checksum had a write error.
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if writers[i] == nil {
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outDatedDisks[i] = nil
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disksToHealCount--
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continue
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}
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partsMetadata[i].AddObjectPart(partNumber, partName, "", partSize, partActualSize)
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partsMetadata[i].Erasure.AddChecksumInfo(ChecksumInfo{partName, checksumAlgo, bitrotWriterSum(writers[i])})
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}
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// If all disks are having errors, we give up.
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if disksToHealCount == 0 {
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return result, fmt.Errorf("all disks without up-to-date data had write errors")
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}
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}
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// Generate and write `xl.json` generated from other disks.
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outDatedDisks, aErr := writeUniqueXLMetadata(ctx, outDatedDisks, minioMetaTmpBucket, tmpID,
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partsMetadata, diskCount(outDatedDisks))
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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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// Rename from tmp location to the actual location.
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for _, disk := range outDatedDisks {
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if disk == nil {
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continue
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}
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// Attempt a rename now from healed data to final location.
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aErr = disk.RenameFile(minioMetaTmpBucket, retainSlash(tmpID), bucket,
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retainSlash(object))
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if aErr != nil {
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logger.LogIf(ctx, aErr)
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return result, toObjectErr(aErr, bucket, object)
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}
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for i, v := range result.Before.Drives {
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if v.Endpoint == disk.String() {
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result.After.Drives[i].State = madmin.DriveStateOk
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}
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}
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}
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// Set the size of the object in the heal result
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result.ObjectSize = latestMeta.Stat.Size
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return result, nil
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}
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// healObjectDir - heals object directory specifically, this special call
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// is needed since we do not have a special backend format for directories.
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func (xl xlObjects) healObjectDir(ctx context.Context, bucket, object string, dryRun bool) (hr madmin.HealResultItem, err error) {
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storageDisks := xl.getDisks()
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// Initialize heal result object
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hr = 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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ParityBlocks: len(storageDisks) / 2,
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DataBlocks: len(storageDisks) / 2,
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ObjectSize: 0,
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}
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hr.Before.Drives = make([]madmin.HealDriveInfo, len(storageDisks))
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hr.After.Drives = make([]madmin.HealDriveInfo, len(storageDisks))
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var wg sync.WaitGroup
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// Prepare object creation in all disks
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for i, d := range storageDisks {
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wg.Add(1)
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go func(idx int, disk StorageAPI) {
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defer wg.Done()
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if disk == nil {
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hr.Before.Drives[idx] = madmin.HealDriveInfo{State: madmin.DriveStateOffline}
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hr.After.Drives[idx] = madmin.HealDriveInfo{State: madmin.DriveStateOffline}
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return
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}
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drive := disk.String()
|
|
hr.Before.Drives[idx] = madmin.HealDriveInfo{UUID: "", Endpoint: drive, State: madmin.DriveStateOffline}
|
|
hr.After.Drives[idx] = madmin.HealDriveInfo{UUID: "", Endpoint: drive, State: madmin.DriveStateOffline}
|
|
|
|
_, statErr := disk.StatVol(pathJoin(bucket, object))
|
|
switch statErr {
|
|
case nil:
|
|
hr.Before.Drives[idx].State = madmin.DriveStateOk
|
|
hr.After.Drives[idx].State = madmin.DriveStateOk
|
|
// Object is fine in this disk, nothing to be done anymore, exiting
|
|
return
|
|
case errVolumeNotFound:
|
|
hr.Before.Drives[idx].State = madmin.DriveStateMissing
|
|
hr.After.Drives[idx].State = madmin.DriveStateMissing
|
|
default:
|
|
logger.LogIf(ctx, err)
|
|
return
|
|
}
|
|
|
|
if dryRun {
|
|
return
|
|
}
|
|
|
|
if err := disk.MakeVol(pathJoin(bucket, object)); err == nil || err == errVolumeExists {
|
|
hr.After.Drives[idx].State = madmin.DriveStateOk
|
|
} else {
|
|
logger.LogIf(ctx, err)
|
|
hr.After.Drives[idx].State = madmin.DriveStateOffline
|
|
}
|
|
}(i, d)
|
|
}
|
|
|
|
wg.Wait()
|
|
return hr, nil
|
|
}
|
|
|
|
// Populates default heal result item entries with possible values when we are returning prematurely.
|
|
// This is to ensure that in any circumstance we are not returning empty arrays with wrong values.
|
|
func defaultHealResult(storageDisks []StorageAPI, errs []error, bucket, object string) madmin.HealResultItem {
|
|
// Initialize heal result object
|
|
result := madmin.HealResultItem{
|
|
Type: madmin.HealItemObject,
|
|
Bucket: bucket,
|
|
Object: object,
|
|
DiskCount: len(storageDisks),
|
|
|
|
// Initialize object size to -1, so we can detect if we are
|
|
// unable to reliably find the object size.
|
|
ObjectSize: -1,
|
|
}
|
|
|
|
for index, disk := range storageDisks {
|
|
if disk == nil {
|
|
result.Before.Drives = append(result.Before.Drives, madmin.HealDriveInfo{
|
|
UUID: "",
|
|
State: madmin.DriveStateOffline,
|
|
})
|
|
result.After.Drives = append(result.After.Drives, madmin.HealDriveInfo{
|
|
UUID: "",
|
|
State: madmin.DriveStateOffline,
|
|
})
|
|
continue
|
|
}
|
|
drive := disk.String()
|
|
driveState := madmin.DriveStateCorrupt
|
|
switch errs[index] {
|
|
case errFileNotFound, errVolumeNotFound:
|
|
driveState = madmin.DriveStateMissing
|
|
}
|
|
result.Before.Drives = append(result.Before.Drives, madmin.HealDriveInfo{
|
|
UUID: "",
|
|
Endpoint: drive,
|
|
State: driveState,
|
|
})
|
|
result.After.Drives = append(result.After.Drives, madmin.HealDriveInfo{
|
|
UUID: "",
|
|
Endpoint: drive,
|
|
State: driveState,
|
|
})
|
|
}
|
|
|
|
// Default to most common configuration for erasure blocks.
|
|
result.ParityBlocks = len(storageDisks) / 2
|
|
result.DataBlocks = len(storageDisks) / 2
|
|
|
|
return result
|
|
}
|
|
|
|
// Object is considered dangling/corrupted if any only
|
|
// if total disks - a combination of corrupted and missing
|
|
// files is lesser than number of data blocks.
|
|
func (xl xlObjects) isObjectDangling(metaArr []xlMetaV1, errs []error) (validMeta xlMetaV1, ok bool) {
|
|
// We can consider an object data not reliable
|
|
// when xl.json is not found in read quorum disks.
|
|
// or when xl.json is not readable in read quorum disks.
|
|
var notFoundXLJSON, corruptedXLJSON int
|
|
for _, readErr := range errs {
|
|
if readErr == errFileNotFound {
|
|
notFoundXLJSON++
|
|
} else if readErr == errCorruptedFormat {
|
|
corruptedXLJSON++
|
|
}
|
|
}
|
|
|
|
for _, m := range metaArr {
|
|
if !m.IsValid() {
|
|
continue
|
|
}
|
|
validMeta = m
|
|
break
|
|
}
|
|
|
|
// We couldn't find any valid meta we are indeed corrupted, return true right away.
|
|
if validMeta.Erasure.DataBlocks == 0 {
|
|
return validMeta, true
|
|
}
|
|
|
|
// We have valid meta, now verify if we have enough files with data blocks.
|
|
return validMeta, (len(xl.getDisks()) - corruptedXLJSON - notFoundXLJSON) < validMeta.Erasure.DataBlocks
|
|
}
|
|
|
|
// 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, remove bool) (hr madmin.HealResultItem, err error) {
|
|
// Create context that also contains information about the object and bucket.
|
|
// The top level handler might not have this information.
|
|
reqInfo := logger.GetReqInfo(ctx)
|
|
var newReqInfo *logger.ReqInfo
|
|
if reqInfo != nil {
|
|
newReqInfo = logger.NewReqInfo(reqInfo.RemoteHost, reqInfo.UserAgent, reqInfo.DeploymentID, reqInfo.RequestID, reqInfo.API, bucket, object)
|
|
} else {
|
|
newReqInfo = logger.NewReqInfo("", "", globalDeploymentID, "", "Heal", bucket, object)
|
|
}
|
|
healCtx := logger.SetReqInfo(context.Background(), newReqInfo)
|
|
|
|
// Healing directories handle it separately.
|
|
if hasSuffix(object, slashSeparator) {
|
|
return xl.healObjectDir(healCtx, bucket, object, dryRun)
|
|
}
|
|
|
|
storageDisks := xl.getDisks()
|
|
|
|
// FIXME: Metadata is read again in the healObject() call below.
|
|
// Read metadata files from all the disks
|
|
partsMetadata, errs := readAllXLMetadata(healCtx, storageDisks, bucket, object)
|
|
|
|
// Check if the object is dangling, if yes and user requested
|
|
// remove we simply delete it from namespace.
|
|
if m, ok := xl.isObjectDangling(partsMetadata, errs); ok {
|
|
writeQuorum := m.Erasure.DataBlocks + 1
|
|
if m.Erasure.DataBlocks == 0 {
|
|
writeQuorum = len(xl.getDisks())/2 + 1
|
|
}
|
|
if !dryRun && remove {
|
|
err = xl.deleteObject(healCtx, bucket, object, writeQuorum, false)
|
|
}
|
|
return defaultHealResult(storageDisks, errs, bucket, object), err
|
|
}
|
|
|
|
latestXLMeta, err := getLatestXLMeta(healCtx, partsMetadata, errs)
|
|
if err != nil {
|
|
return defaultHealResult(storageDisks, errs, bucket, object), toObjectErr(err, bucket, object)
|
|
}
|
|
|
|
// Lock the object before healing.
|
|
objectLock := xl.nsMutex.NewNSLock(bucket, object)
|
|
if lerr := objectLock.GetRLock(globalHealingTimeout); lerr != nil {
|
|
return defaultHealResult(storageDisks, errs, bucket, object), lerr
|
|
}
|
|
defer objectLock.RUnlock()
|
|
|
|
// Heal the object.
|
|
return healObject(healCtx, xl.getDisks(), bucket, object, latestXLMeta.Erasure.DataBlocks, dryRun)
|
|
}
|