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feat: introduce pool-level rebalance (#15483)

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This commit is contained in:
Krishnan Parthasarathi 2022-10-25 12:36:57 -07:00 committed by GitHub
parent ce8456a1a9
commit 4523da6543
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GPG Key ID: 4AEE18F83AFDEB23
20 changed files with 3328 additions and 137 deletions
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12
cmd/admin-handler-utils.go
View File

@ -124,6 +124,18 @@ func toAdminAPIErr(ctx context.Context, err error) APIError {
Description: err.Error(),
HTTPStatusCode: http.StatusBadRequest,
}
case errors.Is(err, errDecommissionRebalanceAlreadyRunning):
apiErr = APIError{
Code: "XMinioDecommissionNotAllowed",
Description: err.Error(),
HTTPStatusCode: http.StatusBadRequest,
}
case errors.Is(err, errRebalanceDecommissionAlreadyRunning):
apiErr = APIError{
Code: "XMinioRebalanceNotAllowed",
Description: err.Error(),
HTTPStatusCode: http.StatusBadRequest,
}
case errors.Is(err, errConfigNotFound):
apiErr = APIError{
Code: "XMinioConfigError",

145
cmd/admin-handlers-pools.go
View File

@ -19,6 +19,7 @@ package cmd
import (
"encoding/json"
"errors"
"fmt"
"net/http"
@ -27,6 +28,11 @@ import (
iampolicy "github.com/minio/pkg/iam/policy"
)
var (
errRebalanceDecommissionAlreadyRunning = errors.New("Rebalance cannot be started, decommission is aleady in progress")
errDecommissionRebalanceAlreadyRunning = errors.New("Decommission cannot be started, rebalance is already in progress")
)
func (a adminAPIHandlers) StartDecommission(w http.ResponseWriter, r *http.Request) {
ctx := newContext(r, w, "StartDecommission")
@ -49,6 +55,11 @@ func (a adminAPIHandlers) StartDecommission(w http.ResponseWriter, r *http.Reque
return
}
if pools.IsRebalanceStarted() {
writeErrorResponseJSON(ctx, w, toAdminAPIErr(ctx, errDecommissionRebalanceAlreadyRunning), r.URL)
return
}
vars := mux.Vars(r)
v := vars["pool"]
@ -200,3 +211,137 @@ func (a adminAPIHandlers) ListPools(w http.ResponseWriter, r *http.Request) {
logger.LogIf(r.Context(), json.NewEncoder(w).Encode(poolsStatus))
}
func (a adminAPIHandlers) RebalanceStart(w http.ResponseWriter, r *http.Request) {
ctx := newContext(r, w, "RebalanceStart")
defer logger.AuditLog(ctx, w, r, mustGetClaimsFromToken(r))
objectAPI, _ := validateAdminReq(ctx, w, r, iampolicy.RebalanceAdminAction)
if objectAPI == nil {
return
}
// NB rebalance-start admin API is always coordinated from first pool's
// first node. The following is required to serialize (the effects of)
// concurrent rebalance-start commands.
if ep := globalEndpoints[0].Endpoints[0]; !ep.IsLocal {
for nodeIdx, proxyEp := range globalProxyEndpoints {
if proxyEp.Endpoint.Host == ep.Host {
if proxyRequestByNodeIndex(ctx, w, r, nodeIdx) {
return
}
}
}
}
pools, ok := objectAPI.(*erasureServerPools)
if !ok || len(pools.serverPools) == 1 {
writeErrorResponseJSON(ctx, w, errorCodes.ToAPIErr(ErrNotImplemented), r.URL)
return
}
if pools.IsDecommissionRunning() {
writeErrorResponseJSON(ctx, w, toAdminAPIErr(ctx, errRebalanceDecommissionAlreadyRunning), r.URL)
return
}
if pools.IsRebalanceStarted() {
writeErrorResponseJSON(ctx, w, errorCodes.ToAPIErr(ErrAdminRebalanceAlreadyStarted), r.URL)
return
}
bucketInfos, err := objectAPI.ListBuckets(ctx, BucketOptions{})
if err != nil {
writeErrorResponseJSON(ctx, w, toAPIError(ctx, err), r.URL)
return
}
buckets := make([]string, 0, len(bucketInfos))
for _, bInfo := range bucketInfos {
buckets = append(buckets, bInfo.Name)
}
var id string
if id, err = pools.initRebalanceMeta(ctx, buckets); err != nil {
writeErrorResponseJSON(ctx, w, toAPIError(ctx, err), r.URL)
return
}
// Rebalance routine is run on the first node of any pool participating in rebalance.
pools.StartRebalance()
b, err := json.Marshal(struct {
ID string `json:"id"`
}{ID: id})
if err != nil {
writeErrorResponseJSON(ctx, w, toAPIError(ctx, err), r.URL)
return
}
writeSuccessResponseJSON(w, b)
// Notify peers to load rebalance.bin and start rebalance routine if they happen to be
// participating pool's leader node
globalNotificationSys.LoadRebalanceMeta(ctx, true)
}
func (a adminAPIHandlers) RebalanceStatus(w http.ResponseWriter, r *http.Request) {
ctx := newContext(r, w, "RebalanceStatus")
defer logger.AuditLog(ctx, w, r, mustGetClaimsFromToken(r))
objectAPI, _ := validateAdminReq(ctx, w, r, iampolicy.RebalanceAdminAction)
if objectAPI == nil {
return
}
// Proxy rebalance-status to first pool first node, so that users see a
// consistent view of rebalance progress even though different rebalancing
// pools may temporarily have out of date info on the others.
if ep := globalEndpoints[0].Endpoints[0]; !ep.IsLocal {
for nodeIdx, proxyEp := range globalProxyEndpoints {
if proxyEp.Endpoint.Host == ep.Host {
if proxyRequestByNodeIndex(ctx, w, r, nodeIdx) {
return
}
}
}
}
pools, ok := objectAPI.(*erasureServerPools)
if !ok {
writeErrorResponseJSON(ctx, w, errorCodes.ToAPIErr(ErrNotImplemented), r.URL)
return
}
rs, err := rebalanceStatus(ctx, pools)
if err != nil {
if errors.Is(err, errRebalanceNotStarted) {
writeErrorResponseJSON(ctx, w, errorCodes.ToAPIErr(ErrAdminRebalanceNotStarted), r.URL)
return
}
logger.LogIf(ctx, fmt.Errorf("failed to fetch rebalance status: %w", err))
writeErrorResponseJSON(ctx, w, toAdminAPIErr(ctx, err), r.URL)
return
}
logger.LogIf(r.Context(), json.NewEncoder(w).Encode(rs))
}
func (a adminAPIHandlers) RebalanceStop(w http.ResponseWriter, r *http.Request) {
ctx := newContext(r, w, "RebalanceStop")
defer logger.AuditLog(ctx, w, r, mustGetClaimsFromToken(r))
objectAPI, _ := validateAdminReq(ctx, w, r, iampolicy.RebalanceAdminAction)
if objectAPI == nil {
return
}
pools, ok := objectAPI.(*erasureServerPools)
if !ok {
writeErrorResponseJSON(ctx, w, errorCodes.ToAPIErr(ErrNotImplemented), r.URL)
return
}
// Cancel any ongoing rebalance operation
globalNotificationSys.StopRebalance(r.Context())
writeSuccessResponseHeadersOnly(w)
logger.LogIf(ctx, pools.saveRebalanceStats(GlobalContext, 0, rebalSaveStoppedAt))
}

5
cmd/admin-router.go
View File

@ -84,6 +84,11 @@ func registerAdminRouter(router *mux.Router, enableConfigOps bool) {
adminRouter.Methods(http.MethodPost).Path(adminVersion+"/pools/decommission").HandlerFunc(gz(httpTraceAll(adminAPI.StartDecommission))).Queries("pool", "{pool:.*}")
adminRouter.Methods(http.MethodPost).Path(adminVersion+"/pools/cancel").HandlerFunc(gz(httpTraceAll(adminAPI.CancelDecommission))).Queries("pool", "{pool:.*}")
// Rebalance operations
adminRouter.Methods(http.MethodPost).Path(adminVersion + "/rebalance/start").HandlerFunc(gz(httpTraceAll(adminAPI.RebalanceStart)))
adminRouter.Methods(http.MethodGet).Path(adminVersion + "/rebalance/status").HandlerFunc(gz(httpTraceAll(adminAPI.RebalanceStatus)))
adminRouter.Methods(http.MethodPost).Path(adminVersion + "/rebalance/stop").HandlerFunc(gz(httpTraceAll(adminAPI.RebalanceStop)))
}
// Profiling operations - deprecated API

14
cmd/api-errors.go
View File

@ -291,6 +291,10 @@ const (
ErrSiteReplicationIAMError
ErrSiteReplicationConfigMissing
// Pool rebalance errors
ErrAdminRebalanceAlreadyStarted
ErrAdminRebalanceNotStarted
// Bucket Quota error codes
ErrAdminBucketQuotaExceeded
ErrAdminNoSuchQuotaConfiguration
@ -1397,6 +1401,16 @@ var errorCodes = errorCodeMap{
Description: "Site not found in site replication configuration",
HTTPStatusCode: http.StatusBadRequest,
},
ErrAdminRebalanceAlreadyStarted: {
Code: "XMinioAdminRebalanceAlreadyStarted",
Description: "Pool rebalance is already started",
HTTPStatusCode: http.StatusConflict,
},
ErrAdminRebalanceNotStarted: {
Code: "XMinioAdminRebalanceNotStarted",
Description: "Pool rebalance is not started",
HTTPStatusCode: http.StatusNotFound,
},
ErrMaximumExpires: {
Code: "AuthorizationQueryParametersError",
Description: "X-Amz-Expires must be less than a week (in seconds); that is, the given X-Amz-Expires must be less than 604800 seconds",

212
cmd/apierrorcode_string.go
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File diff suppressed because one or more lines are too long

20
cmd/config-common.go
View File

@ -29,10 +29,14 @@ import (
var errConfigNotFound = errors.New("config file not found")
func readConfigWithMetadata(ctx context.Context, store objectIO, configFile string) ([]byte, ObjectInfo, error) {
r, err := store.GetObjectNInfo(ctx, minioMetaBucket, configFile, nil, http.Header{}, readLock, ObjectOptions{})
func readConfigWithMetadata(ctx context.Context, store objectIO, configFile string, opts ObjectOptions) ([]byte, ObjectInfo, error) {
lockType := readLock
if opts.NoLock {
lockType = noLock // erasureObjects.GetObjectNInfo honors lockType argument but not opts.NoLock.
}
r, err := store.GetObjectNInfo(ctx, minioMetaBucket, configFile, nil, http.Header{}, lockType, opts)
if err != nil {
// Treat object not found as config not found.
if isErrObjectNotFound(err) {
return nil, ObjectInfo{}, errConfigNotFound
}
@ -52,7 +56,7 @@ func readConfigWithMetadata(ctx context.Context, store objectIO, configFile stri
}
func readConfig(ctx context.Context, store objectIO, configFile string) ([]byte, error) {
buf, _, err := readConfigWithMetadata(ctx, store, configFile)
buf, _, err := readConfigWithMetadata(ctx, store, configFile, ObjectOptions{})
return buf, err
}
@ -70,16 +74,20 @@ func deleteConfig(ctx context.Context, objAPI objectDeleter, configFile string)
return err
}
func saveConfig(ctx context.Context, store objectIO, configFile string, data []byte) error {
func saveConfigWithOpts(ctx context.Context, store objectIO, configFile string, data []byte, opts ObjectOptions) error {
hashReader, err := hash.NewReader(bytes.NewReader(data), int64(len(data)), "", getSHA256Hash(data), int64(len(data)))
if err != nil {
return err
}
_, err = store.PutObject(ctx, minioMetaBucket, configFile, NewPutObjReader(hashReader), ObjectOptions{MaxParity: true})
_, err = store.PutObject(ctx, minioMetaBucket, configFile, NewPutObjReader(hashReader), opts)
return err
}
func saveConfig(ctx context.Context, store objectIO, configFile string, data []byte) error {
return saveConfigWithOpts(ctx, store, configFile, data, ObjectOptions{MaxParity: true})
}
func checkConfig(ctx context.Context, objAPI ObjectLayer, configFile string) error {
if _, err := objAPI.GetObjectInfo(ctx, minioMetaBucket, configFile, ObjectOptions{}); err != nil {
// Treat object not found as config not found.

22
cmd/erasure-server-pool-decom.go
View File

@ -499,6 +499,15 @@ const (
// Init() initializes pools and saves additional information about them
// in 'pool.bin', this is eventually used for decommissioning the pool.
func (z *erasureServerPools) Init(ctx context.Context) error {
// Load rebalance metadata if present
err := z.loadRebalanceMeta(ctx)
if err != nil {
return fmt.Errorf("failed to load rebalance data: %w", err)
}
// Start rebalance routine
z.StartRebalance()
meta := poolMeta{}
if err := meta.load(ctx, z.serverPools[0], z.serverPools); err != nil {
@ -573,6 +582,19 @@ func (z *erasureServerPools) Init(ctx context.Context) error {
return nil
}
func (z *erasureServerPools) IsDecommissionRunning() bool {
z.poolMetaMutex.RLock()
defer z.poolMetaMutex.RUnlock()
meta := z.poolMeta
for _, pool := range meta.Pools {
if pool.Decommission != nil {
return true
}
}
return false
}
func (z *erasureServerPools) decommissionObject(ctx context.Context, bucket string, gr *GetObjectReader) (err error) {
objInfo := gr.ObjInfo

876
cmd/erasure-server-pool-rebalance.go Normal file
View File

@ -0,0 +1,876 @@
// Copyright (c) 2015-2022 MinIO, Inc.
//
// This file is part of MinIO Object Storage stack
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
package cmd
import (
"context"
"encoding/binary"
"errors"
"fmt"
"math"
"math/rand"
"net/http"
"strconv"
"strings"
"sync"
"time"
"github.com/lithammer/shortuuid/v4"
"github.com/minio/madmin-go"
"github.com/minio/minio/internal/bucket/lifecycle"
"github.com/minio/minio/internal/hash"
"github.com/minio/minio/internal/logger"
"github.com/minio/pkg/env"
)
//go:generate msgp -file $GOFILE -unexported
// rebalanceStats contains per-pool rebalance statistics like number of objects,
// versions and bytes rebalanced out of a pool
type rebalanceStats struct {
InitFreeSpace uint64 `json:"initFreeSpace" msg:"ifs"` // Pool free space at the start of rebalance
InitCapacity uint64 `json:"initCapacity" msg:"ic"` // Pool capacity at the start of rebalance
Buckets []string `json:"buckets" msg:"bus"` // buckets being rebalanced or to be rebalanced
RebalancedBuckets []string `json:"rebalancedBuckets" msg:"rbs"` // buckets rebalanced
Bucket string `json:"bucket" msg:"bu"` // Last rebalanced bucket
Object string `json:"object" msg:"ob"` // Last rebalanced object
NumObjects uint64 `json:"numObjects" msg:"no"` // Number of objects rebalanced
NumVersions uint64 `json:"numVersions" msg:"nv"` // Number of versions rebalanced
Bytes uint64 `json:"bytes" msg:"bs"` // Number of bytes rebalanced
Participating bool `json:"participating" msg:"par"`
Info rebalanceInfo `json:"info" msg:"inf"`
}
func (rs *rebalanceStats) update(bucket string, oi ObjectInfo) {
if oi.IsLatest {
rs.NumObjects++
}
rs.NumVersions++
rs.Bytes += uint64(oi.Size)
rs.Bucket = bucket
rs.Object = oi.Name
}
type rstats []*rebalanceStats
//go:generate stringer -type=rebalStatus -trimprefix=rebal $GOFILE
type rebalStatus uint8
const (
rebalNone rebalStatus = iota
rebalStarted
rebalCompleted
rebalStopped
rebalFailed
)
type rebalanceInfo struct {
StartTime time.Time `msg:"startTs"` // Time at which rebalance-start was issued
EndTime time.Time `msg:"stopTs"` // Time at which rebalance operation completed or rebalance-stop was called
Status rebalStatus `msg:"status"` // Current state of rebalance operation. One of Started|Stopped|Completed|Failed.
}
// rebalanceMeta contains information pertaining to an ongoing rebalance operation.
type rebalanceMeta struct {
cancel context.CancelFunc `msg:"-"` // to be invoked on rebalance-stop
lastRefreshedAt time.Time `msg:"-"`
StoppedAt time.Time `msg:"stopTs"` // Time when rebalance-stop was issued.
ID string `msg:"id"` // ID of the ongoing rebalance operation
PercentFreeGoal float64 `msg:"pf"` // Computed from total free space and capacity at the start of rebalance
PoolStats []*rebalanceStats `msg:"rss"` // Per-pool rebalance stats keyed by pool index
}
var errRebalanceNotStarted = errors.New("rebalance not started")
func (z *erasureServerPools) loadRebalanceMeta(ctx context.Context) error {
r := &rebalanceMeta{}
err := r.load(ctx, z.serverPools[0])
if err != nil {
if errors.Is(err, errConfigNotFound) {
return nil
}
return err
}
z.rebalMu.Lock()
z.rebalMeta = r
z.rebalMu.Unlock()
return nil
}
// initRebalanceMeta initializes rebalance metadata for a new rebalance
// operation and saves it in the object store.
func (z *erasureServerPools) initRebalanceMeta(ctx context.Context, buckets []string) (arn string, err error) {
r := &rebalanceMeta{
ID: shortuuid.New(),
PoolStats: make([]*rebalanceStats, len(z.serverPools)),
}
// Fetch disk capacity and available space.
si, _ := z.StorageInfo(ctx)
diskStats := make([]struct {
AvailableSpace uint64
TotalSpace uint64
}, len(z.serverPools))
var totalCap, totalFree uint64
for _, disk := range si.Disks {
totalCap += disk.TotalSpace
totalFree += disk.AvailableSpace
diskStats[disk.PoolIndex].AvailableSpace += disk.AvailableSpace
diskStats[disk.PoolIndex].TotalSpace += disk.TotalSpace
}
r.PercentFreeGoal = float64(totalFree) / float64(totalCap)
now := time.Now()
for idx := range z.serverPools {
r.PoolStats[idx] = &rebalanceStats{
Buckets: make([]string, len(buckets)),
RebalancedBuckets: make([]string, 0, len(buckets)),
InitFreeSpace: diskStats[idx].AvailableSpace,
InitCapacity: diskStats[idx].TotalSpace,
}
copy(r.PoolStats[idx].Buckets, buckets)
if pfi := float64(diskStats[idx].AvailableSpace) / float64(diskStats[idx].TotalSpace); pfi < r.PercentFreeGoal {
r.PoolStats[idx].Participating = true
r.PoolStats[idx].Info = rebalanceInfo{
StartTime: now,
Status: rebalStarted,
}
}
}
err = r.save(ctx, z.serverPools[0])
if err != nil {
return arn, err
}
z.rebalMeta = r
return r.ID, nil
}
func (z *erasureServerPools) updatePoolStats(poolIdx int, bucket string, oi ObjectInfo) {
z.rebalMu.Lock()
defer z.rebalMu.Unlock()
r := z.rebalMeta
if r == nil {
return
}
r.PoolStats[poolIdx].update(bucket, oi)
}
const (
rebalMetaName = "rebalance.bin"
rebalMetaFmt = 1
rebalMetaVer = 1
)
func (z *erasureServerPools) nextRebalBucket(poolIdx int) (string, bool) {
z.rebalMu.RLock()
defer z.rebalMu.RUnlock()
r := z.rebalMeta
if r == nil {
return "", false
}
ps := r.PoolStats[poolIdx]
if ps == nil {
return "", false
}
if ps.Info.Status == rebalCompleted || !ps.Participating {
return "", false
}
if len(ps.Buckets) == 0 {
return "", false
}
return ps.Buckets[0], true
}
func (z *erasureServerPools) bucketRebalanceDone(bucket string, poolIdx int) {
z.rebalMu.Lock()
defer z.rebalMu.Unlock()
ps := z.rebalMeta.PoolStats[poolIdx]
if ps == nil {
return
}
for i, b := range ps.Buckets {
if b == bucket {
ps.Buckets = append(ps.Buckets[:i], ps.Buckets[i+1:]...)
ps.RebalancedBuckets = append(ps.RebalancedBuckets, bucket)
break
}
}
}
func (r *rebalanceMeta) load(ctx context.Context, store objectIO) error {
return r.loadWithOpts(ctx, store, ObjectOptions{})
}
func (r *rebalanceMeta) loadWithOpts(ctx context.Context, store objectIO, opts ObjectOptions) error {
data, _, err := readConfigWithMetadata(ctx, store, rebalMetaName, opts)
if err != nil {
return err
}
if len(data) == 0 {
return nil
}
if len(data) <= 4 {
return fmt.Errorf("rebalanceMeta: no data")
}
// Read header
switch binary.LittleEndian.Uint16(data[0:2]) {
case rebalMetaFmt:
default:
return fmt.Errorf("rebalanceMeta: unknown format: %d", binary.LittleEndian.Uint16(data[0:2]))
}
switch binary.LittleEndian.Uint16(data[2:4]) {
case rebalMetaVer:
default:
return fmt.Errorf("rebalanceMeta: unknown version: %d", binary.LittleEndian.Uint16(data[2:4]))
}
// OK, parse data.
if _, err = r.UnmarshalMsg(data[4:]); err != nil {
return err
}
r.lastRefreshedAt = time.Now()
return nil
}
func (r *rebalanceMeta) saveWithOpts(ctx context.Context, store objectIO, opts ObjectOptions) error {
data := make([]byte, 4, r.Msgsize()+4)
// Initialize the header.
binary.LittleEndian.PutUint16(data[0:2], rebalMetaFmt)
binary.LittleEndian.PutUint16(data[2:4], rebalMetaVer)
buf, err := r.MarshalMsg(data)
if err != nil {
return err
}
return saveConfigWithOpts(ctx, store, rebalMetaName, buf, opts)
}
func (r *rebalanceMeta) save(ctx context.Context, store objectIO) error {
return r.saveWithOpts(ctx, store, ObjectOptions{})
}
func (z *erasureServerPools) IsRebalanceStarted() bool {
z.rebalMu.RLock()
defer z.rebalMu.RUnlock()
if r := z.rebalMeta; r != nil {
if r.StoppedAt.IsZero() {
return true
}
}
return false
}
func (z *erasureServerPools) IsPoolRebalancing(poolIndex int) bool {
z.rebalMu.RLock()
defer z.rebalMu.RUnlock()
if r := z.rebalMeta; r != nil {
if !r.StoppedAt.IsZero() {
return false
}
ps := z.rebalMeta.PoolStats[poolIndex]
return ps.Participating && ps.Info.Status == rebalStarted
}
return false
}
func (z *erasureServerPools) rebalanceBuckets(ctx context.Context, poolIdx int) (err error) {
doneCh := make(chan struct{})
defer close(doneCh)
// Save rebalance.bin periodically.
go func() {
// Update rebalance.bin periodically once every 5-10s, chosen randomly
// to avoid multiple pool leaders herding to update around the same
// time.
r := rand.New(rand.NewSource(time.Now().UnixNano()))
randSleepFor := func() time.Duration {
return 5*time.Second + time.Duration(float64(5*time.Second)*r.Float64())
}
timer := time.NewTimer(randSleepFor())
defer timer.Stop()
var rebalDone bool
var traceMsg string
for {
select {
case <-doneCh:
// rebalance completed for poolIdx
now := time.Now()
z.rebalMu.Lock()
z.rebalMeta.PoolStats[poolIdx].Info.Status = rebalCompleted
z.rebalMeta.PoolStats[poolIdx].Info.EndTime = now
z.rebalMu.Unlock()
rebalDone = true
traceMsg = fmt.Sprintf("completed at %s", now)
case <-ctx.Done():
// rebalance stopped for poolIdx
now := time.Now()
z.rebalMu.Lock()
z.rebalMeta.PoolStats[poolIdx].Info.Status = rebalStopped
z.rebalMeta.PoolStats[poolIdx].Info.EndTime = now
z.rebalMu.Unlock()
rebalDone = true
traceMsg = fmt.Sprintf("stopped at %s", now)
case <-timer.C:
traceMsg = fmt.Sprintf("saved at %s", time.Now())
}
stopFn := globalRebalanceMetrics.log(rebalanceMetricSaveMetadata, poolIdx, traceMsg)
err := z.saveRebalanceStats(ctx, poolIdx, rebalSaveStats)
stopFn(err)
logger.LogIf(ctx, err)
timer.Reset(randSleepFor())
if rebalDone {
return
}
}
}()
for {
select {
case <-ctx.Done():
return
default:
}
bucket, ok := z.nextRebalBucket(poolIdx)
if !ok {
// no more buckets to rebalance or target free_space/capacity reached
break
}
stopFn := globalRebalanceMetrics.log(rebalanceMetricRebalanceBucket, poolIdx, bucket)
err = z.rebalanceBucket(ctx, bucket, poolIdx)
if err != nil {
stopFn(err)
logger.LogIf(ctx, err)
return
}
stopFn(nil)
z.bucketRebalanceDone(bucket, poolIdx)
}
return err
}
func (z *erasureServerPools) checkIfRebalanceDone(poolIdx int) bool {
z.rebalMu.Lock()
defer z.rebalMu.Unlock()
// check if enough objects have been rebalanced
r := z.rebalMeta
poolStats := r.PoolStats[poolIdx]
if poolStats.Info.Status == rebalCompleted {
return true
}
pfi := float64(poolStats.InitFreeSpace+poolStats.Bytes) / float64(poolStats.InitCapacity)
// Mark pool rebalance as done if within 5% from PercentFreeGoal.
if diff := math.Abs(pfi - r.PercentFreeGoal); diff <= 0.05 {
r.PoolStats[poolIdx].Info.Status = rebalCompleted
r.PoolStats[poolIdx].Info.EndTime = time.Now()
return true
}
return false
}
// rebalanceBucket rebalances objects under bucket in poolIdx pool
func (z *erasureServerPools) rebalanceBucket(ctx context.Context, bucket string, poolIdx int) error {
ctx = logger.SetReqInfo(ctx, &logger.ReqInfo{})
vc, _ := globalBucketVersioningSys.Get(bucket)
// Check if the current bucket has a configured lifecycle policy
lc, _ := globalLifecycleSys.Get(bucket)
// Check if bucket is object locked.
lr, _ := globalBucketObjectLockSys.Get(bucket)
pool := z.serverPools[poolIdx]
const envRebalanceWorkers = "_MINIO_REBALANCE_WORKERS"
wStr := env.Get(envRebalanceWorkers, strconv.Itoa(len(pool.sets)))
workerSize, err := strconv.Atoi(wStr)
if err != nil {
logger.LogIf(ctx, fmt.Errorf("invalid %s value: %s err: %v, defaulting to %d", envRebalanceWorkers, wStr, err, len(pool.sets)))
workerSize = len(pool.sets)
}
workers := make(chan struct{}, workerSize)
var wg sync.WaitGroup
for _, set := range pool.sets {
set := set
disks := set.getOnlineDisks()
if len(disks) == 0 {
logger.LogIf(ctx, fmt.Errorf("no online disks found for set with endpoints %s",
set.getEndpoints()))
continue
}
filterLifecycle := func(bucket, object string, fi FileInfo) bool {
if lc == nil {
return false
}
versioned := vc != nil && vc.Versioned(object)
objInfo := fi.ToObjectInfo(bucket, object, versioned)
event := evalActionFromLifecycle(ctx, *lc, lr, objInfo)
switch action := event.Action; action {
case lifecycle.DeleteVersionAction, lifecycle.DeleteAction:
globalExpiryState.enqueueByDays(objInfo, false, action == lifecycle.DeleteVersionAction)
// Skip this entry.
return true
case lifecycle.DeleteRestoredAction, lifecycle.DeleteRestoredVersionAction:
globalExpiryState.enqueueByDays(objInfo, true, action == lifecycle.DeleteRestoredVersionAction)
// Skip this entry.
return true
}
return false
}
rebalanceEntry := func(entry metaCacheEntry) {
defer func() {
<-workers
wg.Done()
}()
if entry.isDir() {
return
}
// rebalance on poolIdx has reached its goal
if z.checkIfRebalanceDone(poolIdx) {
return
}
fivs, err := entry.fileInfoVersions(bucket)
if err != nil {
return
}
// We need a reversed order for rebalance,
// to create the appropriate stack.
versionsSorter(fivs.Versions).reverse()
var rebalanced int
for _, version := range fivs.Versions {
// Skip transitioned objects for now. TBD
if version.IsRemote() {
continue
}
// Apply lifecycle rules on the objects that are expired.
if filterLifecycle(bucket, version.Name, version) {
logger.LogIf(ctx, fmt.Errorf("found %s/%s (%s) expired object based on ILM rules, skipping and scheduled for deletion", bucket, version.Name, version.VersionID))
continue
}
// We will skip rebalancing delete markers
// with single version, its as good as there
// is no data associated with the object.
if version.Deleted && len(fivs.Versions) == 1 {
logger.LogIf(ctx, fmt.Errorf("found %s/%s delete marked object with no other versions, skipping since there is no data to be rebalanced", bucket, version.Name))
continue
}
if version.Deleted {
_, err := z.DeleteObject(ctx,
bucket,
version.Name,
ObjectOptions{
Versioned: vc.PrefixEnabled(version.Name),
VersionID: version.VersionID,
MTime: version.ModTime,
DeleteReplication: version.ReplicationState,
DeleteMarker: true, // make sure we create a delete marker
SkipRebalancing: true, // make sure we skip the decommissioned pool
})
var failure bool
if err != nil && !isErrObjectNotFound(err) && !isErrVersionNotFound(err) {
logger.LogIf(ctx, err)
failure = true
}
if !failure {
z.updatePoolStats(poolIdx, bucket, version.ToObjectInfo(bucket, version.Name, vc.PrefixEnabled(version.Name)))
rebalanced++
}
continue
}
var failure bool
var oi ObjectInfo
for try := 0; try < 3; try++ {
// GetObjectReader.Close is called by rebalanceObject
gr, err := set.GetObjectNInfo(ctx,
bucket,
encodeDirObject(version.Name),
nil,
http.Header{},
noLock, // all mutations are blocked reads are safe without locks.
ObjectOptions{
VersionID: version.VersionID,
NoDecryption: true,
})
if isErrObjectNotFound(err) || isErrVersionNotFound(err) {
// object deleted by the application, nothing to do here we move on.
return
}
if err != nil {
failure = true
logger.LogIf(ctx, err)
continue
}
stopFn := globalRebalanceMetrics.log(rebalanceMetricRebalanceObject, poolIdx, bucket, version.Name)
if err = z.rebalanceObject(ctx, bucket, gr); err != nil {
stopFn(err)
failure = true
logger.LogIf(ctx, err)
continue
}
stopFn(nil)
failure = false
oi = gr.ObjInfo
break
}
if failure {
break // break out on first error
}
z.updatePoolStats(poolIdx, bucket, oi)
rebalanced++
}
// if all versions were rebalanced, we can delete the object versions.
if rebalanced == len(fivs.Versions) {
stopFn := globalRebalanceMetrics.log(rebalanceMetricRebalanceRemoveObject, poolIdx, bucket, entry.name)
_, err := set.DeleteObject(ctx,
bucket,
encodeDirObject(entry.name),
ObjectOptions{
DeletePrefix: true, // use prefix delete to delete all versions at once.
},
)
stopFn(err)
auditLogRebalance(ctx, "Rebalance:DeleteObject", bucket, entry.name, "", err)
if err != nil {
logger.LogIf(ctx, err)
}
}
}
wg.Add(1)
go func() {
defer wg.Done()
// How to resolve partial results.
resolver := metadataResolutionParams{
dirQuorum: len(disks) / 2, // make sure to capture all quorum ratios
objQuorum: len(disks) / 2, // make sure to capture all quorum ratios
bucket: bucket,
}
err := listPathRaw(ctx, listPathRawOptions{
disks: disks,
bucket: bucket,
recursive: true,
forwardTo: "",
minDisks: len(disks) / 2, // to capture all quorum ratios
reportNotFound: false,
agreed: func(entry metaCacheEntry) {
workers <- struct{}{}
wg.Add(1)
go rebalanceEntry(entry)
},
partial: func(entries metaCacheEntries, _ []error) {
entry, ok := entries.resolve(&resolver)
if ok {
workers <- struct{}{}
wg.Add(1)
go rebalanceEntry(*entry)
}
},
finished: nil,
})
logger.LogIf(ctx, err)
}()
}
wg.Wait()
return nil
}
type rebalSaveOpts uint8
const (
rebalSaveStats rebalSaveOpts = iota
rebalSaveStoppedAt
)
func (z *erasureServerPools) saveRebalanceStats(ctx context.Context, poolIdx int, opts rebalSaveOpts) error {
lock := z.serverPools[0].NewNSLock(minioMetaBucket, rebalMetaName)
lkCtx, err := lock.GetLock(ctx, globalOperationTimeout)
if err != nil {
logger.LogIf(ctx, fmt.Errorf("failed to acquire write lock on %s/%s: %w", minioMetaBucket, rebalMetaName, err))
return err
}
defer lock.Unlock(lkCtx.Cancel)
ctx = lkCtx.Context()
noLockOpts := ObjectOptions{NoLock: true}
r := &rebalanceMeta{}
if err := r.loadWithOpts(ctx, z.serverPools[0], noLockOpts); err != nil {
return err
}
z.rebalMu.Lock()
defer z.rebalMu.Unlock()
switch opts {
case rebalSaveStoppedAt:
r.StoppedAt = time.Now()
case rebalSaveStats:
r.PoolStats[poolIdx] = z.rebalMeta.PoolStats[poolIdx]
}
z.rebalMeta = r
err = z.rebalMeta.saveWithOpts(ctx, z.serverPools[0], noLockOpts)
return err
}
func auditLogRebalance(ctx context.Context, apiName, bucket, object, versionID string, err error) {
errStr := ""
if err != nil {
errStr = err.Error()
}
auditLogInternal(ctx, AuditLogOptions{
Event: "rebalance",
APIName: apiName,
Bucket: bucket,
Object: object,
VersionID: versionID,
Error: errStr,
})
}
func (z *erasureServerPools) rebalanceObject(ctx context.Context, bucket string, gr *GetObjectReader) (err error) {
oi := gr.ObjInfo
defer func() {
gr.Close()
auditLogRebalance(ctx, "RebalanceCopyData", oi.Bucket, oi.Name, oi.VersionID, err)
}()
actualSize, err := oi.GetActualSize()
if err != nil {
return err
}
if oi.isMultipart() {
res, err := z.NewMultipartUpload(ctx, bucket, oi.Name, ObjectOptions{
VersionID: oi.VersionID,
MTime: oi.ModTime,
UserDefined: oi.UserDefined,
})
if err != nil {
return fmt.Errorf("rebalanceObject: NewMultipartUpload() %w", err)
}
defer z.AbortMultipartUpload(ctx, bucket, oi.Name, res.UploadID, ObjectOptions{})
parts := make([]CompletePart, len(oi.Parts))
for i, part := range oi.Parts {
hr, err := hash.NewReader(gr, part.Size, "", "", part.ActualSize)
if err != nil {
return fmt.Errorf("rebalanceObject: hash.NewReader() %w", err)
}
pi, err := z.PutObjectPart(ctx, bucket, oi.Name, res.UploadID,
part.Number,
NewPutObjReader(hr),
ObjectOptions{
PreserveETag: part.ETag, // Preserve original ETag to ensure same metadata.
IndexCB: func() []byte {
return part.Index // Preserve part Index to ensure decompression works.
},
})
if err != nil {
return fmt.Errorf("rebalanceObject: PutObjectPart() %w", err)
}
parts[i] = CompletePart{
ETag: pi.ETag,
PartNumber: pi.PartNumber,
}
}
_, err = z.CompleteMultipartUpload(ctx, bucket, oi.Name, res.UploadID, parts, ObjectOptions{
MTime: oi.ModTime,
})
if err != nil {
err = fmt.Errorf("rebalanceObject: CompleteMultipartUpload() %w", err)
}
return err
}
hr, err := hash.NewReader(gr, oi.Size, "", "", actualSize)
if err != nil {
return fmt.Errorf("rebalanceObject: hash.NewReader() %w", err)
}
_, err = z.PutObject(ctx,
bucket,
oi.Name,
NewPutObjReader(hr),
ObjectOptions{
VersionID: oi.VersionID,
MTime: oi.ModTime,
UserDefined: oi.UserDefined,
PreserveETag: oi.ETag, // Preserve original ETag to ensure same metadata.
IndexCB: func() []byte {
return oi.Parts[0].Index // Preserve part Index to ensure decompression works.
},
})
if err != nil {
err = fmt.Errorf("rebalanceObject: PutObject() %w", err)
}
return err
}
func (z *erasureServerPools) StartRebalance() {
z.rebalMu.Lock()
if z.rebalMeta == nil || !z.rebalMeta.StoppedAt.IsZero() { // rebalance not running, nothing to do
z.rebalMu.Unlock()
return
}
ctx, cancel := context.WithCancel(GlobalContext)
z.rebalMeta.cancel = cancel // to be used when rebalance-stop is called
z.rebalMu.Unlock()
z.rebalMu.RLock()
participants := make([]bool, len(z.rebalMeta.PoolStats))
for i, ps := range z.rebalMeta.PoolStats {
// skip pools which have completed rebalancing
if ps.Info.Status != rebalStarted {
continue
}
participants[i] = ps.Participating
}
z.rebalMu.RUnlock()
for poolIdx, doRebalance := range participants {
if !doRebalance {
continue
}
// nothing to do if this node is not pool's first node (i.e pool's rebalance 'leader').
if !globalEndpoints[poolIdx].Endpoints[0].IsLocal {
continue
}
go func(idx int) {
stopfn := globalRebalanceMetrics.log(rebalanceMetricRebalanceBuckets, idx)
err := z.rebalanceBuckets(ctx, idx)
stopfn(err)
}(poolIdx)
}
return
}
// StopRebalance signals the rebalance goroutine running on this node (if any)
// to stop, using the context.CancelFunc(s) saved at the time ofStartRebalance.
func (z *erasureServerPools) StopRebalance() error {
z.rebalMu.Lock()
defer z.rebalMu.Unlock()
r := z.rebalMeta
if r == nil { // rebalance not running in this node, nothing to do
return nil
}
if cancel := r.cancel; cancel != nil {
// cancel != nil only on pool leaders
r.cancel = nil
cancel()
}
return nil
}
// for rebalance trace support
type rebalanceMetrics struct{}
var globalRebalanceMetrics rebalanceMetrics
//go:generate stringer -type=rebalanceMetric -trimprefix=rebalanceMetric $GOFILE
type rebalanceMetric uint8
const (
rebalanceMetricRebalanceBuckets rebalanceMetric = iota
rebalanceMetricRebalanceBucket
rebalanceMetricRebalanceObject
rebalanceMetricRebalanceRemoveObject
rebalanceMetricSaveMetadata
)
func rebalanceTrace(r rebalanceMetric, poolIdx int, startTime time.Time, duration time.Duration, err error, path string) madmin.TraceInfo {
var errStr string
if err != nil {
errStr = err.Error()
}
return madmin.TraceInfo{
TraceType: madmin.TraceRebalance,
Time: startTime,
NodeName: globalLocalNodeName,
FuncName: fmt.Sprintf("rebalance.%s (pool-id=%d)", r.String(), poolIdx),
Duration: duration,
Path: path,
Error: errStr,
}
}
func (p *rebalanceMetrics) log(r rebalanceMetric, poolIdx int, paths ...string) func(err error) {
startTime := time.Now()
return func(err error) {
duration := time.Since(startTime)
if globalTrace.NumSubscribers(madmin.TraceRebalance) > 0 {
globalTrace.Publish(rebalanceTrace(r, poolIdx, startTime, duration, err, strings.Join(paths, " ")))
}
}
}

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575
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@ -0,0 +1,575 @@
package cmd
// Code generated by github.com/tinylib/msgp DO NOT EDIT.
import (
"bytes"
"testing"
"github.com/tinylib/msgp/msgp"
)
func TestMarshalUnmarshalrebalanceInfo(t *testing.T) {
v := rebalanceInfo{}
bts, err := v.MarshalMsg(nil)
if err != nil {
t.Fatal(err)
}
left, err := v.UnmarshalMsg(bts)
if err != nil {
t.Fatal(err)
}
if len(left) > 0 {
t.Errorf("%d bytes left over after UnmarshalMsg(): %q", len(left), left)
}
left, err = msgp.Skip(bts)
if err != nil {
t.Fatal(err)
}
if len(left) > 0 {
t.Errorf("%d bytes left over after Skip(): %q", len(left), left)
}
}
func BenchmarkMarshalMsgrebalanceInfo(b *testing.B) {
v := rebalanceInfo{}
b.ReportAllocs()
b.ResetTimer()
for i := 0; i < b.N; i++ {
v.MarshalMsg(nil)
}
}
func BenchmarkAppendMsgrebalanceInfo(b *testing.B) {
v := rebalanceInfo{}
bts := make([]byte, 0, v.Msgsize())
bts, _ = v.MarshalMsg(bts[0:0])
b.SetBytes(int64(len(bts)))
b.ReportAllocs()
b.ResetTimer()
for i := 0; i < b.N; i++ {
bts, _ = v.MarshalMsg(bts[0:0])
}
}
func BenchmarkUnmarshalrebalanceInfo(b *testing.B) {
v := rebalanceInfo{}
bts, _ := v.MarshalMsg(nil)
b.ReportAllocs()
b.SetBytes(int64(len(bts)))
b.ResetTimer()
for i := 0; i < b.N; i++ {
_, err := v.UnmarshalMsg(bts)
if err != nil {
b.Fatal(err)
}
}
}
func TestEncodeDecoderebalanceInfo(t *testing.T) {
v := rebalanceInfo{}
var buf bytes.Buffer
msgp.Encode(&buf, &v)
m := v.Msgsize()
if buf.Len() > m {
t.Log("WARNING: TestEncodeDecoderebalanceInfo Msgsize() is inaccurate")
}
vn := rebalanceInfo{}
err := msgp.Decode(&buf, &vn)
if err != nil {
t.Error(err)
}
buf.Reset()
msgp.Encode(&buf, &v)
err = msgp.NewReader(&buf).Skip()
if err != nil {
t.Error(err)
}
}
func BenchmarkEncoderebalanceInfo(b *testing.B) {
v := rebalanceInfo{}
var buf bytes.Buffer
msgp.Encode(&buf, &v)
b.SetBytes(int64(buf.Len()))
en := msgp.NewWriter(msgp.Nowhere)
b.ReportAllocs()
b.ResetTimer()
for i := 0; i < b.N; i++ {
v.EncodeMsg(en)
}
en.Flush()
}
func BenchmarkDecoderebalanceInfo(b *testing.B) {
v := rebalanceInfo{}
var buf bytes.Buffer
msgp.Encode(&buf, &v)
b.SetBytes(int64(buf.Len()))
rd := msgp.NewEndlessReader(buf.Bytes(), b)
dc := msgp.NewReader(rd)
b.ReportAllocs()
b.ResetTimer()
for i := 0; i < b.N; i++ {
err := v.DecodeMsg(dc)
if err != nil {
b.Fatal(err)
}
}
}
func TestMarshalUnmarshalrebalanceMeta(t *testing.T) {
v := rebalanceMeta{}
bts, err := v.MarshalMsg(nil)
if err != nil {
t.Fatal(err)
}
left, err := v.UnmarshalMsg(bts)
if err != nil {
t.Fatal(err)
}
if len(left) > 0 {
t.Errorf("%d bytes left over after UnmarshalMsg(): %q", len(left), left)
}
left, err = msgp.Skip(bts)
if err != nil {
t.Fatal(err)
}
if len(left) > 0 {
t.Errorf("%d bytes left over after Skip(): %q", len(left), left)
}
}
func BenchmarkMarshalMsgrebalanceMeta(b *testing.B) {
v := rebalanceMeta{}
b.ReportAllocs()
b.ResetTimer()
for i := 0; i < b.N; i++ {
v.MarshalMsg(nil)
}
}
func BenchmarkAppendMsgrebalanceMeta(b *testing.B) {
v := rebalanceMeta{}
bts := make([]byte, 0, v.Msgsize())
bts, _ = v.MarshalMsg(bts[0:0])
b.SetBytes(int64(len(bts)))
b.ReportAllocs()
b.ResetTimer()
for i := 0; i < b.N; i++ {
bts, _ = v.MarshalMsg(bts[0:0])
}
}
func BenchmarkUnmarshalrebalanceMeta(b *testing.B) {
v := rebalanceMeta{}
bts, _ := v.MarshalMsg(nil)
b.ReportAllocs()
b.SetBytes(int64(len(bts)))
b.ResetTimer()
for i := 0; i < b.N; i++ {
_, err := v.UnmarshalMsg(bts)
if err != nil {
b.Fatal(err)
}
}
}
func TestEncodeDecoderebalanceMeta(t *testing.T) {
v := rebalanceMeta{}
var buf bytes.Buffer
msgp.Encode(&buf, &v)
m := v.Msgsize()
if buf.Len() > m {
t.Log("WARNING: TestEncodeDecoderebalanceMeta Msgsize() is inaccurate")
}
vn := rebalanceMeta{}
err := msgp.Decode(&buf, &vn)
if err != nil {
t.Error(err)
}
buf.Reset()
msgp.Encode(&buf, &v)
err = msgp.NewReader(&buf).Skip()
if err != nil {
t.Error(err)
}
}
func BenchmarkEncoderebalanceMeta(b *testing.B) {
v := rebalanceMeta{}
var buf bytes.Buffer
msgp.Encode(&buf, &v)
b.SetBytes(int64(buf.Len()))
en := msgp.NewWriter(msgp.Nowhere)
b.ReportAllocs()
b.ResetTimer()
for i := 0; i < b.N; i++ {
v.EncodeMsg(en)
}
en.Flush()
}
func BenchmarkDecoderebalanceMeta(b *testing.B) {
v := rebalanceMeta{}
var buf bytes.Buffer
msgp.Encode(&buf, &v)
b.SetBytes(int64(buf.Len()))
rd := msgp.NewEndlessReader(buf.Bytes(), b)
dc := msgp.NewReader(rd)
b.ReportAllocs()
b.ResetTimer()
for i := 0; i < b.N; i++ {
err := v.DecodeMsg(dc)
if err != nil {
b.Fatal(err)
}
}
}
func TestMarshalUnmarshalrebalanceMetrics(t *testing.T) {
v := rebalanceMetrics{}
bts, err := v.MarshalMsg(nil)
if err != nil {
t.Fatal(err)
}
left, err := v.UnmarshalMsg(bts)
if err != nil {
t.Fatal(err)
}
if len(left) > 0 {
t.Errorf("%d bytes left over after UnmarshalMsg(): %q", len(left), left)
}
left, err = msgp.Skip(bts)
if err != nil {
t.Fatal(err)
}
if len(left) > 0 {
t.Errorf("%d bytes left over after Skip(): %q", len(left), left)
}
}
func BenchmarkMarshalMsgrebalanceMetrics(b *testing.B) {
v := rebalanceMetrics{}
b.ReportAllocs()
b.ResetTimer()
for i := 0; i < b.N; i++ {
v.MarshalMsg(nil)
}
}
func BenchmarkAppendMsgrebalanceMetrics(b *testing.B) {
v := rebalanceMetrics{}
bts := make([]byte, 0, v.Msgsize())
bts, _ = v.MarshalMsg(bts[0:0])
b.SetBytes(int64(len(bts)))
b.ReportAllocs()
b.ResetTimer()
for i := 0; i < b.N; i++ {
bts, _ = v.MarshalMsg(bts[0:0])
}
}
func BenchmarkUnmarshalrebalanceMetrics(b *testing.B) {
v := rebalanceMetrics{}
bts, _ := v.MarshalMsg(nil)
b.ReportAllocs()
b.SetBytes(int64(len(bts)))
b.ResetTimer()
for i := 0; i < b.N; i++ {
_, err := v.UnmarshalMsg(bts)
if err != nil {
b.Fatal(err)
}
}
}
func TestEncodeDecoderebalanceMetrics(t *testing.T) {
v := rebalanceMetrics{}
var buf bytes.Buffer
msgp.Encode(&buf, &v)
m := v.Msgsize()
if buf.Len() > m {
t.Log("WARNING: TestEncodeDecoderebalanceMetrics Msgsize() is inaccurate")
}
vn := rebalanceMetrics{}
err := msgp.Decode(&buf, &vn)
if err != nil {
t.Error(err)
}
buf.Reset()
msgp.Encode(&buf, &v)
err = msgp.NewReader(&buf).Skip()
if err != nil {
t.Error(err)
}
}
func BenchmarkEncoderebalanceMetrics(b *testing.B) {
v := rebalanceMetrics{}
var buf bytes.Buffer
msgp.Encode(&buf, &v)
b.SetBytes(int64(buf.Len()))
en := msgp.NewWriter(msgp.Nowhere)
b.ReportAllocs()
b.ResetTimer()
for i := 0; i < b.N; i++ {
v.EncodeMsg(en)
}
en.Flush()
}
func BenchmarkDecoderebalanceMetrics(b *testing.B) {
v := rebalanceMetrics{}
var buf bytes.Buffer
msgp.Encode(&buf, &v)
b.SetBytes(int64(buf.Len()))
rd := msgp.NewEndlessReader(buf.Bytes(), b)
dc := msgp.NewReader(rd)
b.ReportAllocs()
b.ResetTimer()
for i := 0; i < b.N; i++ {
err := v.DecodeMsg(dc)
if err != nil {
b.Fatal(err)
}
}
}
func TestMarshalUnmarshalrebalanceStats(t *testing.T) {
v := rebalanceStats{}
bts, err := v.MarshalMsg(nil)
if err != nil {
t.Fatal(err)
}
left, err := v.UnmarshalMsg(bts)
if err != nil {
t.Fatal(err)
}
if len(left) > 0 {
t.Errorf("%d bytes left over after UnmarshalMsg(): %q", len(left), left)
}
left, err = msgp.Skip(bts)
if err != nil {
t.Fatal(err)
}
if len(left) > 0 {
t.Errorf("%d bytes left over after Skip(): %q", len(left), left)
}
}
func BenchmarkMarshalMsgrebalanceStats(b *testing.B) {
v := rebalanceStats{}
b.ReportAllocs()
b.ResetTimer()
for i := 0; i < b.N; i++ {
v.MarshalMsg(nil)
}
}
func BenchmarkAppendMsgrebalanceStats(b *testing.B) {
v := rebalanceStats{}
bts := make([]byte, 0, v.Msgsize())
bts, _ = v.MarshalMsg(bts[0:0])
b.SetBytes(int64(len(bts)))
b.ReportAllocs()
b.ResetTimer()
for i := 0; i < b.N; i++ {
bts, _ = v.MarshalMsg(bts[0:0])
}
}
func BenchmarkUnmarshalrebalanceStats(b *testing.B) {
v := rebalanceStats{}
bts, _ := v.MarshalMsg(nil)
b.ReportAllocs()
b.SetBytes(int64(len(bts)))
b.ResetTimer()
for i := 0; i < b.N; i++ {
_, err := v.UnmarshalMsg(bts)
if err != nil {
b.Fatal(err)
}
}
}
func TestEncodeDecoderebalanceStats(t *testing.T) {
v := rebalanceStats{}
var buf bytes.Buffer
msgp.Encode(&buf, &v)
m := v.Msgsize()
if buf.Len() > m {
t.Log("WARNING: TestEncodeDecoderebalanceStats Msgsize() is inaccurate")
}
vn := rebalanceStats{}
err := msgp.Decode(&buf, &vn)
if err != nil {
t.Error(err)
}
buf.Reset()
msgp.Encode(&buf, &v)
err = msgp.NewReader(&buf).Skip()
if err != nil {
t.Error(err)
}
}
func BenchmarkEncoderebalanceStats(b *testing.B) {
v := rebalanceStats{}
var buf bytes.Buffer
msgp.Encode(&buf, &v)
b.SetBytes(int64(buf.Len()))
en := msgp.NewWriter(msgp.Nowhere)
b.ReportAllocs()
b.ResetTimer()
for i := 0; i < b.N; i++ {
v.EncodeMsg(en)
}
en.Flush()
}
func BenchmarkDecoderebalanceStats(b *testing.B) {
v := rebalanceStats{}
var buf bytes.Buffer
msgp.Encode(&buf, &v)
b.SetBytes(int64(buf.Len()))
rd := msgp.NewEndlessReader(buf.Bytes(), b)
dc := msgp.NewReader(rd)
b.ReportAllocs()
b.ResetTimer()
for i := 0; i < b.N; i++ {
err := v.DecodeMsg(dc)
if err != nil {
b.Fatal(err)
}
}
}
func TestMarshalUnmarshalrstats(t *testing.T) {
v := rstats{}
bts, err := v.MarshalMsg(nil)
if err != nil {
t.Fatal(err)
}
left, err := v.UnmarshalMsg(bts)
if err != nil {
t.Fatal(err)
}
if len(left) > 0 {
t.Errorf("%d bytes left over after UnmarshalMsg(): %q", len(left), left)
}
left, err = msgp.Skip(bts)
if err != nil {
t.Fatal(err)
}
if len(left) > 0 {
t.Errorf("%d bytes left over after Skip(): %q", len(left), left)
}
}
func BenchmarkMarshalMsgrstats(b *testing.B) {
v := rstats{}
b.ReportAllocs()
b.ResetTimer()
for i := 0; i < b.N; i++ {
v.MarshalMsg(nil)
}
}
func BenchmarkAppendMsgrstats(b *testing.B) {
v := rstats{}
bts := make([]byte, 0, v.Msgsize())
bts, _ = v.MarshalMsg(bts[0:0])
b.SetBytes(int64(len(bts)))
b.ReportAllocs()
b.ResetTimer()
for i := 0; i < b.N; i++ {
bts, _ = v.MarshalMsg(bts[0:0])
}
}
func BenchmarkUnmarshalrstats(b *testing.B) {
v := rstats{}
bts, _ := v.MarshalMsg(nil)
b.ReportAllocs()
b.SetBytes(int64(len(bts)))
b.ResetTimer()
for i := 0; i < b.N; i++ {
_, err := v.UnmarshalMsg(bts)
if err != nil {
b.Fatal(err)
}
}
}
func TestEncodeDecoderstats(t *testing.T) {
v := rstats{}
var buf bytes.Buffer
msgp.Encode(&buf, &v)
m := v.Msgsize()
if buf.Len() > m {
t.Log("WARNING: TestEncodeDecoderstats Msgsize() is inaccurate")
}
vn := rstats{}
err := msgp.Decode(&buf, &vn)
if err != nil {
t.Error(err)
}
buf.Reset()
msgp.Encode(&buf, &v)
err = msgp.NewReader(&buf).Skip()
if err != nil {
t.Error(err)
}
}
func BenchmarkEncoderstats(b *testing.B) {
v := rstats{}
var buf bytes.Buffer
msgp.Encode(&buf, &v)
b.SetBytes(int64(buf.Len()))
en := msgp.NewWriter(msgp.Nowhere)
b.ReportAllocs()
b.ResetTimer()
for i := 0; i < b.N; i++ {
v.EncodeMsg(en)
}
en.Flush()
}
func BenchmarkDecoderstats(b *testing.B) {
v := rstats{}
var buf bytes.Buffer
msgp.Encode(&buf, &v)
b.SetBytes(int64(buf.Len()))
rd := msgp.NewEndlessReader(buf.Bytes(), b)
dc := msgp.NewReader(rd)
b.ReportAllocs()
b.ResetTimer()
for i := 0; i < b.N; i++ {
err := v.DecodeMsg(dc)
if err != nil {
b.Fatal(err)
}
}
}

24
cmd/erasure-server-pool.go
View File

@ -44,7 +44,11 @@ import (
type erasureServerPools struct {
poolMetaMutex sync.RWMutex
poolMeta poolMeta
serverPools []*erasureSets
rebalMu sync.RWMutex
rebalMeta *rebalanceMeta
serverPools []*erasureSets
// Shut down async operations
shutdown context.CancelFunc
@ -327,8 +331,9 @@ func (z *erasureServerPools) getServerPoolsAvailableSpace(ctx context.Context, b
g := errgroup.WithNErrs(len(z.serverPools))
for index := range z.serverPools {
index := index
// skip suspended pools for any new I/O.
if z.IsSuspended(index) {
// Skip suspended pools or pools participating in rebalance for any new
// I/O.
if z.IsSuspended(index) || z.IsPoolRebalancing(index) {
continue
}
pool := z.serverPools[index]
@ -426,6 +431,10 @@ func (z *erasureServerPools) getPoolInfoExistingWithOpts(ctx context.Context, bu
if z.IsSuspended(pinfo.Index) && opts.SkipDecommissioned {
continue
}
// Skip object if it's from pools participating in a rebalance operation.
if opts.SkipRebalancing && z.IsPoolRebalancing(pinfo.Index) {
continue
}
if pinfo.Err != nil && !isErrObjectNotFound(pinfo.Err) {
return pinfo, pinfo.Err
@ -466,6 +475,7 @@ func (z *erasureServerPools) getPoolIdxExistingNoLock(ctx context.Context, bucke
return z.getPoolIdxExistingWithOpts(ctx, bucket, object, ObjectOptions{
NoLock: true,
SkipDecommissioned: true,
SkipRebalancing: true,
})
}
@ -489,7 +499,10 @@ func (z *erasureServerPools) getPoolIdxNoLock(ctx context.Context, bucket, objec
// if none are found falls back to most available space pool, this function is
// designed to be only used by PutObject, CopyObject (newObject creation) and NewMultipartUpload.
func (z *erasureServerPools) getPoolIdx(ctx context.Context, bucket, object string, size int64) (idx int, err error) {
idx, err = z.getPoolIdxExistingWithOpts(ctx, bucket, object, ObjectOptions{SkipDecommissioned: true})
idx, err = z.getPoolIdxExistingWithOpts(ctx, bucket, object, ObjectOptions{
SkipDecommissioned: true,
SkipRebalancing: true,
})
if err != nil && !isErrObjectNotFound(err) {
return idx, err
}
@ -1387,9 +1400,10 @@ func (z *erasureServerPools) NewMultipartUpload(ctx context.Context, bucket, obj
}
for idx, pool := range z.serverPools {
if z.IsSuspended(idx) {
if z.IsSuspended(idx) || z.IsPoolRebalancing(idx) {
continue
}
result, err := pool.ListMultipartUploads(ctx, bucket, object, "", "", "", maxUploadsList)
if err != nil {
return nil, err

2
cmd/iam-object-store.go
View File

@ -91,7 +91,7 @@ func (iamOS *IAMObjectStore) saveIAMConfig(ctx context.Context, item interface{}
}
func (iamOS *IAMObjectStore) loadIAMConfigBytesWithMetadata(ctx context.Context, objPath string) ([]byte, ObjectInfo, error) {
data, meta, err := readConfigWithMetadata(ctx, iamOS.objAPI, objPath)
data, meta, err := readConfigWithMetadata(ctx, iamOS.objAPI, objPath, ObjectOptions{})
if err != nil {
return nil, meta, err
}

43
cmd/notification.go
View File

@ -630,6 +630,49 @@ func (sys *NotificationSys) ReloadPoolMeta(ctx context.Context) {
}
}
// StopRebalance notifies all MinIO nodes to signal any ongoing rebalance
// goroutine to stop.
func (sys *NotificationSys) StopRebalance(ctx context.Context) {
ng := WithNPeers(len(sys.peerClients))
for idx, client := range sys.peerClients {
if client == nil {
continue
}
client := client
ng.Go(ctx, func() error {
return client.StopRebalance(ctx)
}, idx, *client.host)
}
for _, nErr := range ng.Wait() {
reqInfo := (&logger.ReqInfo{}).AppendTags("peerAddress", nErr.Host.String())
if nErr.Err != nil {
logger.LogIf(logger.SetReqInfo(ctx, reqInfo), nErr.Err)
}
}
}
// LoadRebalanceMeta notifies all peers to load rebalance.bin from object layer.
// Note: Only peers participating in rebalance operation, namely the first node
// in each pool will load rebalance.bin.
func (sys *NotificationSys) LoadRebalanceMeta(ctx context.Context, startRebalance bool) {
ng := WithNPeers(len(sys.peerClients))
for idx, client := range sys.peerClients {
if client == nil {
continue
}
client := client
ng.Go(ctx, func() error {
return client.LoadRebalanceMeta(ctx, startRebalance)
}, idx, *client.host)
}
for _, nErr := range ng.Wait() {
reqInfo := (&logger.ReqInfo{}).AppendTags("peerAddress", nErr.Host.String())
if nErr.Err != nil {
logger.LogIf(logger.SetReqInfo(ctx, reqInfo), nErr.Err)
}
}
}
// LoadTransitionTierConfig notifies remote peers to load their remote tier
// configs from config store.
func (sys *NotificationSys) LoadTransitionTierConfig(ctx context.Context) {

3
cmd/object-api-interface.go
View File

@ -85,6 +85,9 @@ type ObjectOptions struct {
// SkipDecommissioned set to 'true' if the call requires skipping the pool being decommissioned.
// mainly set for certain WRITE operations.
SkipDecommissioned bool
// SkipRebalancing should be set to 'true' if the call should skip pools
// participating in a rebalance operation. Typically set for 'write' operations.
SkipRebalancing bool
WalkFilter func(info FileInfo) bool // return WalkFilter returns 'true/false'
WalkMarker string // set to skip until this object

22
cmd/peer-rest-client.go
View File

@ -551,6 +551,28 @@ func (client *peerRESTClient) ReloadPoolMeta(ctx context.Context) error {
return nil
}
func (client *peerRESTClient) StopRebalance(ctx context.Context) error {
respBody, err := client.callWithContext(ctx, peerRESTMethodStopRebalance, nil, nil, 0)
if err != nil {
logger.LogIf(ctx, err)
return err
}
defer http.DrainBody(respBody)
return nil
}
func (client *peerRESTClient) LoadRebalanceMeta(ctx context.Context, startRebalance bool) error {
values := url.Values{}
values.Set(peerRESTStartRebalance, strconv.FormatBool(startRebalance))
respBody, err := client.callWithContext(ctx, peerRESTMethodLoadRebalanceMeta, values, nil, 0)
if err != nil {
logger.LogIf(ctx, err)
return err
}
defer http.DrainBody(respBody)
return nil
}
func (client *peerRESTClient) LoadTransitionTierConfig(ctx context.Context) error {
respBody, err := client.callWithContext(ctx, peerRESTMethodLoadTransitionTierConfig, nil, nil, 0)
if err != nil {

44
cmd/peer-rest-common.go
View File

@ -18,7 +18,8 @@
package cmd
const (
peerRESTVersion = "v27" // change in GetAllBucketStats response.
peerRESTVersion = "v28" // Added Rebalance peer APIs
peerRESTVersionPrefix = SlashSeparator + peerRESTVersion
peerRESTPrefix = minioReservedBucketPath + "/peer"
peerRESTPath = peerRESTPrefix + peerRESTVersionPrefix
@ -68,6 +69,8 @@ const (
peerRESTMethodDriveSpeedTest = "/drivespeedtest"
peerRESTMethodReloadSiteReplicationConfig = "/reloadsitereplicationconfig"
peerRESTMethodReloadPoolMeta = "/reloadpoolmeta"
peerRESTMethodLoadRebalanceMeta = "/loadrebalancemeta"
peerRESTMethodStopRebalance = "/stoprebalance"
peerRESTMethodGetLastDayTierStats = "/getlastdaytierstats"
peerRESTMethodDevNull = "/devnull"
peerRESTMethodNetperf = "/netperf"
@ -75,25 +78,26 @@ const (
)
const (
peerRESTBucket = "bucket"
peerRESTBuckets = "buckets"
peerRESTUser = "user"
peerRESTGroup = "group"
peerRESTUserTemp = "user-temp"
peerRESTPolicy = "policy"
peerRESTUserOrGroup = "user-or-group"
peerRESTUserType = "user-type"
peerRESTIsGroup = "is-group"
peerRESTSignal = "signal"
peerRESTSubSys = "sub-sys"
peerRESTProfiler = "profiler"
peerRESTSize = "size"
peerRESTConcurrent = "concurrent"
peerRESTDuration = "duration"
peerRESTStorageClass = "storage-class"
peerRESTMetricsTypes = "types"
peerRESTDisk = "disk"
peerRESTJobID = "job-id"
peerRESTBucket = "bucket"
peerRESTBuckets = "buckets"
peerRESTUser = "user"
peerRESTGroup = "group"
peerRESTUserTemp = "user-temp"
peerRESTPolicy = "policy"
peerRESTUserOrGroup = "user-or-group"
peerRESTUserType = "user-type"
peerRESTIsGroup = "is-group"
peerRESTSignal = "signal"
peerRESTSubSys = "sub-sys"
peerRESTProfiler = "profiler"
peerRESTSize = "size"
peerRESTConcurrent = "concurrent"
peerRESTDuration = "duration"
peerRESTStorageClass = "storage-class"
peerRESTMetricsTypes = "types"
peerRESTDisk = "disk"
peerRESTJobID = "job-id"
peerRESTStartRebalance = "start-rebalance"
peerRESTListenBucket = "bucket"
peerRESTListenPrefix = "prefix"

56
cmd/peer-rest-server.go
View File

@ -1048,6 +1048,60 @@ func (s *peerRESTServer) ReloadPoolMetaHandler(w http.ResponseWriter, r *http.Re
}
}
func (s *peerRESTServer) StopRebalanceHandler(w http.ResponseWriter, r *http.Request) {
if !s.IsValid(w, r) {
s.writeErrorResponse(w, errors.New("invalid request"))
return
}
objAPI := newObjectLayerFn()
if objAPI == nil {
s.writeErrorResponse(w, errServerNotInitialized)
return
}
pools, ok := objAPI.(*erasureServerPools)
if !ok {
s.writeErrorResponse(w, errors.New("not a multiple pools setup"))
return
}
pools.StopRebalance()
}
func (s *peerRESTServer) LoadRebalanceMetaHandler(w http.ResponseWriter, r *http.Request) {
if !s.IsValid(w, r) {
s.writeErrorResponse(w, errors.New("invalid request"))
return
}
objAPI := newObjectLayerFn()
if objAPI == nil {
s.writeErrorResponse(w, errServerNotInitialized)
return
}
pools, ok := objAPI.(*erasureServerPools)
if !ok {
s.writeErrorResponse(w, errors.New("not a multiple pools setup"))
return
}
startRebalanceStr := r.Form.Get(peerRESTStartRebalance)
startRebalance, err := strconv.ParseBool(startRebalanceStr)
if err != nil {
s.writeErrorResponse(w, err)
return
}
if err := pools.loadRebalanceMeta(r.Context()); err != nil {
s.writeErrorResponse(w, err)
return
}
if startRebalance {
go pools.StartRebalance()
}
}
func (s *peerRESTServer) LoadTransitionTierConfigHandler(w http.ResponseWriter, r *http.Request) {
if !s.IsValid(w, r) {
s.writeErrorResponse(w, errors.New("invalid request"))
@ -1352,5 +1406,7 @@ func registerPeerRESTHandlers(router *mux.Router) {
subrouter.Methods(http.MethodPost).Path(peerRESTVersionPrefix + peerRESTMethodDevNull).HandlerFunc(httpTraceHdrs(server.DevNull))
subrouter.Methods(http.MethodPost).Path(peerRESTVersionPrefix + peerRESTMethodReloadSiteReplicationConfig).HandlerFunc(httpTraceHdrs(server.ReloadSiteReplicationConfigHandler))
subrouter.Methods(http.MethodPost).Path(peerRESTVersionPrefix + peerRESTMethodReloadPoolMeta).HandlerFunc(httpTraceHdrs(server.ReloadPoolMetaHandler))
subrouter.Methods(http.MethodPost).Path(peerRESTVersionPrefix + peerRESTMethodLoadRebalanceMeta).HandlerFunc(httpTraceHdrs(server.LoadRebalanceMetaHandler))
subrouter.Methods(http.MethodPost).Path(peerRESTVersionPrefix + peerRESTMethodStopRebalance).HandlerFunc(httpTraceHdrs(server.StopRebalanceHandler))
subrouter.Methods(http.MethodPost).Path(peerRESTVersionPrefix + peerRESTMethodGetLastDayTierStats).HandlerFunc(httpTraceHdrs(server.GetLastDayTierStatsHandler))
}

108
cmd/rebalance-admin.go Normal file
View File

@ -0,0 +1,108 @@
// Copyright (c) 2022 MinIO, Inc.
//
// This file is part of MinIO Object Storage stack
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
package cmd
import (
"context"
"time"
)
type rebalPoolProgress struct {
NumObjects uint64 `json:"objects"`
NumVersions uint64 `json:"versions"`
Bytes uint64 `json:"bytes"`
Bucket string `json:"bucket"`
Object string `json:"object"`
Elapsed time.Duration `json:"elapsed"`
ETA time.Duration `json:"eta"`
}
type rebalancePoolStatus struct {
ID int `json:"id"` // Pool index (zero-based)
Status string `json:"status"` // Active if rebalance is running, empty otherwise
Used float64 `json:"used"` // Percentage used space
Progress rebalPoolProgress `json:"progress,omitempty"` // is empty when rebalance is not running
}
// rebalanceAdminStatus holds rebalance status related information exported to mc, console, etc.
type rebalanceAdminStatus struct {
ID string // identifies the ongoing rebalance operation by a uuid
Pools []rebalancePoolStatus `json:"pools"` // contains all pools, including inactive
StoppedAt time.Time `json:"stoppedAt,omitempty"`
}
func rebalanceStatus(ctx context.Context, z *erasureServerPools) (r rebalanceAdminStatus, err error) {
// Load latest rebalance status
meta := &rebalanceMeta{}
err = meta.load(ctx, z.serverPools[0])
if err != nil {
return r, err
}
// Compute disk usage percentage
si, _ := z.StorageInfo(ctx)
diskStats := make([]struct {
AvailableSpace uint64
TotalSpace uint64
}, len(z.serverPools))
for _, disk := range si.Disks {
diskStats[disk.PoolIndex].AvailableSpace += disk.AvailableSpace
diskStats[disk.PoolIndex].TotalSpace += disk.TotalSpace
}
stopTime := meta.StoppedAt
r = rebalanceAdminStatus{
ID: meta.ID,
StoppedAt: meta.StoppedAt,
Pools: make([]rebalancePoolStatus, len(meta.PoolStats)),
}
for i, ps := range meta.PoolStats {
r.Pools[i] = rebalancePoolStatus{
ID: i,
Status: ps.Info.Status.String(),
Used: float64(diskStats[i].TotalSpace-diskStats[i].AvailableSpace) / float64(diskStats[i].TotalSpace),
}
if !ps.Participating {
continue
}
// for participating pools, total bytes to be rebalanced by this pool is given by,
// pf_c = (f_i + x)/c_i,
// pf_c - percentage free space across pools, f_i - ith pool's free space, c_i - ith pool's capacity
// i.e. x = c_i*pfc -f_i
totalBytesToRebal := float64(ps.InitCapacity)*meta.PercentFreeGoal - float64(ps.InitFreeSpace)
elapsed := time.Since(ps.Info.StartTime)
eta := time.Duration(totalBytesToRebal * float64(elapsed) / float64(ps.Bytes))
if !ps.Info.EndTime.IsZero() {
stopTime = ps.Info.EndTime
}
if !stopTime.IsZero() { // rebalance is stopped or completed
elapsed = stopTime.Sub(ps.Info.StartTime)
eta = 0
}
r.Pools[i].Progress = rebalPoolProgress{
NumObjects: ps.NumObjects,
NumVersions: ps.NumVersions,
Bytes: ps.Bytes,
Elapsed: elapsed,
ETA: eta,
}
}
return r, nil
}

27
cmd/rebalancemetric_string.go Normal file
View File

@ -0,0 +1,27 @@
// Code generated by "stringer -type=rebalanceMetric -trimprefix=rebalanceMetric erasure-server-pool-rebalance.go"; DO NOT EDIT.
package cmd
import "strconv"
func _() {
// An "invalid array index" compiler error signifies that the constant values have changed.
// Re-run the stringer command to generate them again.
var x [1]struct{}
_ = x[rebalanceMetricRebalanceBuckets-0]
_ = x[rebalanceMetricRebalanceBucket-1]
_ = x[rebalanceMetricRebalanceObject-2]
_ = x[rebalanceMetricRebalanceRemoveObject-3]
_ = x[rebalanceMetricSaveMetadata-4]
}
const _rebalanceMetric_name = "RebalanceBucketsRebalanceBucketRebalanceObjectRebalanceRemoveObjectSaveMetadata"
var _rebalanceMetric_index = [...]uint8{0, 16, 31, 46, 67, 79}
func (i rebalanceMetric) String() string {
if i >= rebalanceMetric(len(_rebalanceMetric_index)-1) {
return "rebalanceMetric(" + strconv.FormatInt(int64(i), 10) + ")"
}
return _rebalanceMetric_name[_rebalanceMetric_index[i]:_rebalanceMetric_index[i+1]]
}

27
cmd/rebalstatus_string.go Normal file
View File

@ -0,0 +1,27 @@
// Code generated by "stringer -type=rebalStatus -trimprefix=rebal erasure-server-pool-rebalance.go"; DO NOT EDIT.
package cmd
import "strconv"
func _() {
// An "invalid array index" compiler error signifies that the constant values have changed.
// Re-run the stringer command to generate them again.
var x [1]struct{}
_ = x[rebalNone-0]
_ = x[rebalStarted-1]
_ = x[rebalCompleted-2]
_ = x[rebalStopped-3]
_ = x[rebalFailed-4]
}
const _rebalStatus_name = "NoneStartedCompletedStoppedFailed"
var _rebalStatus_index = [...]uint8{0, 4, 11, 20, 27, 33}
func (i rebalStatus) String() string {
if i >= rebalStatus(len(_rebalStatus_index)-1) {
return "rebalStatus(" + strconv.FormatInt(int64(i), 10) + ")"
}
return _rebalStatus_name[_rebalStatus_index[i]:_rebalStatus_index[i+1]]
}