minio/cmd/rebalance-admin.go

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// 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 {
// Ignore invalid.
if disk.PoolIndex < 0 || len(diskStats) <= disk.PoolIndex {
// https://github.com/minio/minio/issues/16500
continue
}
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
}