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minio/cmd/xl-v1.go

375 lines
9.6 KiB

/*
* MinIO Cloud Storage, (C) 2016, 2017, 2018 MinIO, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package cmd
import (
"context"
"fmt"
"sort"
"sync"
"time"
"github.com/minio/minio/cmd/logger"
"github.com/minio/minio/pkg/bpool"
"github.com/minio/minio/pkg/dsync"
"github.com/minio/minio/pkg/madmin"
"github.com/minio/minio/pkg/sync/errgroup"
)
// XL constants.
const (
// XL metadata file carries per object metadata.
xlMetaJSONFile = "xl.json"
)
// OfflineDisk represents an unavailable disk.
var OfflineDisk StorageAPI // zero value is nil
// partialUpload is a successful upload of an object
// but not written in all disks (having quorum)
type partialUpload struct {
bucket string
object string
failedSet int
}
// xlObjects - Implements XL object layer.
type xlObjects struct {
// getDisks returns list of storageAPIs.
getDisks func() []StorageAPI
// getLockers returns list of remote and local lockers.
getLockers func() []dsync.NetLocker
endpoints Endpoints
// Locker mutex map.
nsMutex *nsLockMap
// Byte pools used for temporary i/o buffers.
bp *bpool.BytePoolCap
// TODO: ListObjects pool management, should be removed in future.
listPool *TreeWalkPool
mrfUploadCh chan partialUpload
}
// NewNSLock - initialize a new namespace RWLocker instance.
func (xl xlObjects) NewNSLock(ctx context.Context, bucket string, objects ...string) RWLocker {
return xl.nsMutex.NewNSLock(ctx, xl.getLockers, bucket, objects...)
}
// Shutdown function for object storage interface.
func (xl xlObjects) Shutdown(ctx context.Context) error {
// Add any object layer shutdown activities here.
closeStorageDisks(xl.getDisks())
return nil
}
// byDiskTotal is a collection satisfying sort.Interface.
type byDiskTotal []DiskInfo
func (d byDiskTotal) Len() int { return len(d) }
func (d byDiskTotal) Swap(i, j int) { d[i], d[j] = d[j], d[i] }
func (d byDiskTotal) Less(i, j int) bool {
return d[i].Total < d[j].Total
}
// getDisksInfo - fetch disks info across all other storage API.
func getDisksInfo(disks []StorageAPI, endpoints Endpoints) (disksInfo []DiskInfo, onlineDisks, offlineDisks madmin.BackendDisks) {
disksInfo = make([]DiskInfo, len(disks))
g := errgroup.WithNErrs(len(disks))
for index := range disks {
index := index
g.Go(func() error {
if disks[index] == nil {
// Storage disk is empty, perhaps ignored disk or not available.
return errDiskNotFound
}
info, err := disks[index].DiskInfo()
if err != nil {
if IsErr(err, baseErrs...) {
return err
}
reqInfo := (&logger.ReqInfo{}).AppendTags("disk", disks[index].String())
ctx := logger.SetReqInfo(context.Background(), reqInfo)
logger.LogIf(ctx, err)
}
disksInfo[index] = info
return nil
}, index)
}
onlineDisks = make(madmin.BackendDisks)
offlineDisks = make(madmin.BackendDisks)
// Wait for the routines.
for i, diskInfoErr := range g.Wait() {
peerAddr := endpoints[i].Host
if _, ok := offlineDisks[peerAddr]; !ok {
offlineDisks[peerAddr] = 0
}
if _, ok := onlineDisks[peerAddr]; !ok {
onlineDisks[peerAddr] = 0
}
if disks[i] == nil || diskInfoErr != nil {
offlineDisks[peerAddr]++
continue
}
onlineDisks[peerAddr]++
}
// Success.
return disksInfo, onlineDisks, offlineDisks
}
// Get an aggregated storage info across all disks.
func getStorageInfo(disks []StorageAPI, endpoints Endpoints) StorageInfo {
disksInfo, onlineDisks, offlineDisks := getDisksInfo(disks, endpoints)
// Sort so that the first element is the smallest.
sort.Sort(byDiskTotal(disksInfo))
// Combine all disks to get total usage
usedList := make([]uint64, len(disksInfo))
totalList := make([]uint64, len(disksInfo))
availableList := make([]uint64, len(disksInfo))
mountPaths := make([]string, len(disksInfo))
for i, di := range disksInfo {
usedList[i] = di.Used
totalList[i] = di.Total
availableList[i] = di.Free
mountPaths[i] = di.MountPath
}
storageInfo := StorageInfo{
Used: usedList,
Total: totalList,
Available: availableList,
MountPaths: mountPaths,
}
storageInfo.Backend.Type = BackendErasure
storageInfo.Backend.OnlineDisks = onlineDisks
storageInfo.Backend.OfflineDisks = offlineDisks
return storageInfo
}
// StorageInfo - returns underlying storage statistics.
func (xl xlObjects) StorageInfo(ctx context.Context, local bool) StorageInfo {
var endpoints = xl.endpoints
var disks []StorageAPI
if !local {
disks = xl.getDisks()
} else {
for i, d := range xl.getDisks() {
if endpoints[i].IsLocal {
// Append this local disk since local flag is true
disks = append(disks, d)
}
}
}
return getStorageInfo(disks, endpoints)
}
// GetMetrics - is not implemented and shouldn't be called.
func (xl xlObjects) GetMetrics(ctx context.Context) (*Metrics, error) {
logger.LogIf(ctx, NotImplemented{})
return &Metrics{}, NotImplemented{}
}
// CrawlAndGetDataUsage will start crawling buckets and send updated totals as they are traversed.
// Updates are sent on a regular basis and the caller *must* consume them.
func (xl xlObjects) CrawlAndGetDataUsage(ctx context.Context, updates chan<- DataUsageInfo) error {
cache := make(chan dataUsageCache, 1)
defer close(cache)
buckets, err := xl.ListBuckets(ctx)
if err != nil {
return err
}
go func() {
for update := range cache {
updates <- update.dui(update.Info.Name, buckets)
}
}()
return xl.crawlAndGetDataUsage(ctx, buckets, cache)
}
// CrawlAndGetDataUsage will start crawling buckets and send updated totals as they are traversed.
// Updates are sent on a regular basis and the caller *must* consume them.
func (xl xlObjects) crawlAndGetDataUsage(ctx context.Context, buckets []BucketInfo, updates chan<- dataUsageCache) error {
var disks []StorageAPI
for _, d := range xl.getLoadBalancedDisks() {
if d == nil || !d.IsOnline() {
continue
}
disks = append(disks, d)
}
if len(disks) == 0 || len(buckets) == 0 {
return nil
}
// Load bucket totals
oldCache := dataUsageCache{}
err := oldCache.load(ctx, xl, dataUsageCacheName)
if err != nil {
return err
}
// New cache..
cache := dataUsageCache{
Info: dataUsageCacheInfo{
Name: dataUsageRoot,
NextCycle: oldCache.Info.NextCycle,
},
Cache: make(map[dataUsageHash]dataUsageEntry, len(oldCache.Cache)),
}
// Put all buckets into channel.
bucketCh := make(chan BucketInfo, len(buckets))
// Add new buckets first
for _, b := range buckets {
if oldCache.find(b.Name) == nil {
bucketCh <- b
}
}
// Add existing buckets.
for _, b := range buckets {
e := oldCache.find(b.Name)
if e != nil {
bucketCh <- b
cache.replace(b.Name, dataUsageRoot, *e)
}
}
close(bucketCh)
buckets = nil
bucketResults := make(chan dataUsageEntryInfo, len(disks))
// Start async collector/saver.
// This goroutine owns the cache.
var saverWg sync.WaitGroup
saverWg.Add(1)
go func() {
const updateTime = 30 * time.Second
t := time.NewTicker(updateTime)
defer t.Stop()
defer saverWg.Done()
var lastSave time.Time
saveLoop:
for {
select {
case <-ctx.Done():
// Return without saving.
return
case <-t.C:
if cache.Info.LastUpdate.Equal(lastSave) {
continue
}
logger.LogIf(ctx, cache.save(ctx, xl, dataUsageCacheName))
updates <- cache.clone()
lastSave = cache.Info.LastUpdate
case v, ok := <-bucketResults:
if !ok {
break saveLoop
}
cache.replace(v.Name, v.Parent, v.Entry)
cache.Info.LastUpdate = time.Now()
}
}
// Save final state...
cache.Info.NextCycle++
cache.Info.LastUpdate = time.Now()
logger.LogIf(ctx, cache.save(ctx, xl, dataUsageCacheName))
updates <- cache
}()
// Start one crawler per disk
var wg sync.WaitGroup
wg.Add(len(disks))
for i := range disks {
go func(i int) {
defer wg.Done()
disk := disks[i]
for bucket := range bucketCh {
select {
case <-ctx.Done():
return
default:
}
// Load cache for bucket
cacheName := pathJoin(bucket.Name, dataUsageCacheName)
cache := dataUsageCache{}
logger.LogIf(ctx, cache.load(ctx, xl, cacheName))
if cache.Info.Name == "" {
cache.Info.Name = bucket.Name
}
if cache.Info.Name != bucket.Name {
logger.LogIf(ctx, fmt.Errorf("cache name mismatch: %s != %s", cache.Info.Name, bucket.Name))
cache.Info = dataUsageCacheInfo{
Name: bucket.Name,
LastUpdate: time.Time{},
NextCycle: 0,
}
}
// Calc usage
before := cache.Info.LastUpdate
cache, err = disk.CrawlAndGetDataUsage(ctx, cache)
if err != nil {
logger.LogIf(ctx, err)
if cache.Info.LastUpdate.After(before) {
logger.LogIf(ctx, cache.save(ctx, xl, cacheName))
}
continue
}
var root dataUsageEntry
if r := cache.root(); r != nil {
root = cache.flatten(*r)
}
bucketResults <- dataUsageEntryInfo{
Name: cache.Info.Name,
Parent: dataUsageRoot,
Entry: root,
}
// Save cache
logger.LogIf(ctx, cache.save(ctx, xl, cacheName))
}
}(i)
}
wg.Wait()
close(bucketResults)
saverWg.Wait()
return nil
}
// IsReady - No Op.
func (xl xlObjects) IsReady(ctx context.Context) bool {
logger.CriticalIf(ctx, NotImplemented{})
return true
}