minio/cmd/xl-v1.go
2016-11-25 18:17:53 -08:00

223 lines
6.5 KiB
Go

/*
* Minio Cloud Storage, (C) 2016 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 (
"fmt"
"os"
"sort"
"strings"
"sync"
humanize "github.com/dustin/go-humanize"
"github.com/minio/minio/pkg/disk"
"github.com/minio/minio/pkg/objcache"
)
// XL constants.
const (
// Format config file carries backend format specific details.
formatConfigFile = "format.json"
// Format config tmp file carries backend format.
formatConfigFileTmp = "format.json.tmp"
// XL metadata file carries per object metadata.
xlMetaJSONFile = "xl.json"
// Uploads metadata file carries per multipart object metadata.
uploadsJSONFile = "uploads.json"
// 8GiB cache by default.
maxCacheSize = 8 * humanize.GiByte
// Maximum erasure blocks.
maxErasureBlocks = 16
// Minimum erasure blocks.
minErasureBlocks = 4
)
// xlObjects - Implements XL object layer.
type xlObjects struct {
mutex *sync.Mutex
storageDisks []StorageAPI // Collection of initialized backend disks.
dataBlocks int // dataBlocks count caculated for erasure.
parityBlocks int // parityBlocks count calculated for erasure.
readQuorum int // readQuorum minimum required disks to read data.
writeQuorum int // writeQuorum minimum required disks to write data.
// ListObjects pool management.
listPool *treeWalkPool
// Object cache for caching objects.
objCache *objcache.Cache
// Object cache enabled.
objCacheEnabled bool
}
// list of all errors that can be ignored in tree walk operation in XL
var xlTreeWalkIgnoredErrs = append(baseIgnoredErrs, errDiskAccessDenied, errVolumeNotFound, errFileNotFound)
// newXLObjects - initialize new xl object layer.
func newXLObjects(storageDisks []StorageAPI) (ObjectLayer, error) {
if storageDisks == nil {
return nil, errInvalidArgument
}
readQuorum := len(storageDisks) / 2
writeQuorum := len(storageDisks)/2 + 1
// Load saved XL format.json and validate.
newStorageDisks, err := loadFormatXL(storageDisks, readQuorum)
if err != nil {
return nil, fmt.Errorf("Unable to recognize backend format, %s", err)
}
// Calculate data and parity blocks.
dataBlocks, parityBlocks := len(newStorageDisks)/2, len(newStorageDisks)/2
// Initialize object cache.
objCache := objcache.New(globalMaxCacheSize, globalCacheExpiry)
// Initialize list pool.
listPool := newTreeWalkPool(globalLookupTimeout)
// Check if object cache is disabled.
objCacheDisabled := strings.EqualFold(os.Getenv("_MINIO_CACHE"), "off")
// Initialize xl objects.
xl := &xlObjects{
mutex: &sync.Mutex{},
storageDisks: newStorageDisks,
dataBlocks: dataBlocks,
parityBlocks: parityBlocks,
listPool: listPool,
objCache: objCache,
objCacheEnabled: !objCacheDisabled,
}
// Initialize meta volume, if volume already exists ignores it.
if err = initMetaVolume(storageDisks); err != nil {
return nil, fmt.Errorf("Unable to initialize '.minio.sys' meta volume, %s", err)
}
// Figure out read and write quorum based on number of storage disks.
// READ and WRITE quorum is always set to (N/2) number of disks.
xl.readQuorum = readQuorum
xl.writeQuorum = writeQuorum
// Do a quick heal on the buckets themselves for any discrepancies.
if err := quickHeal(xl.storageDisks, xl.writeQuorum, xl.readQuorum); err != nil {
return xl, err
}
// Return successfully initialized object layer.
return xl, nil
}
// Shutdown function for object storage interface.
func (xl xlObjects) Shutdown() error {
// Add any object layer shutdown activities here.
return nil
}
// byDiskTotal is a collection satisfying sort.Interface.
type byDiskTotal []disk.Info
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) (disksInfo []disk.Info, onlineDisks int, offlineDisks int) {
disksInfo = make([]disk.Info, len(disks))
for i, storageDisk := range disks {
if storageDisk == nil {
// Storage disk is empty, perhaps ignored disk or not available.
offlineDisks++
continue
}
info, err := storageDisk.DiskInfo()
if err != nil {
errorIf(err, "Unable to fetch disk info for %#v", storageDisk)
if err == errDiskNotFound {
offlineDisks++
}
continue
}
onlineDisks++
disksInfo[i] = info
}
// Success.
return disksInfo, onlineDisks, offlineDisks
}
// returns sorted disksInfo slice which has only valid entries.
// i.e the entries where the total size of the disk is not stated
// as 0Bytes, this means that the disk is not online or ignored.
func sortValidDisksInfo(disksInfo []disk.Info) []disk.Info {
var validDisksInfo []disk.Info
for _, diskInfo := range disksInfo {
if diskInfo.Total == 0 {
continue
}
validDisksInfo = append(validDisksInfo, diskInfo)
}
sort.Sort(byDiskTotal(validDisksInfo))
return validDisksInfo
}
// Get an aggregated storage info across all disks.
func getStorageInfo(disks []StorageAPI) StorageInfo {
disksInfo, onlineDisks, offlineDisks := getDisksInfo(disks)
// Sort so that the first element is the smallest.
validDisksInfo := sortValidDisksInfo(disksInfo)
if len(validDisksInfo) == 0 {
return StorageInfo{
Total: -1,
Free: -1,
}
}
// Return calculated storage info, choose the lowest Total and
// Free as the total aggregated values. Total capacity is always
// the multiple of smallest disk among the disk list.
storageInfo := StorageInfo{
Total: validDisksInfo[0].Total * int64(onlineDisks) / 2,
Free: validDisksInfo[0].Free * int64(onlineDisks) / 2,
}
storageInfo.Backend.Type = XL
storageInfo.Backend.OnlineDisks = onlineDisks
storageInfo.Backend.OfflineDisks = offlineDisks
return storageInfo
}
// StorageInfo - returns underlying storage statistics.
func (xl xlObjects) StorageInfo() StorageInfo {
storageInfo := getStorageInfo(xl.storageDisks)
storageInfo.Backend.ReadQuorum = xl.readQuorum
storageInfo.Backend.WriteQuorum = xl.writeQuorum
return storageInfo
}