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monitor.go
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monitor.go
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// Copyright (c) 2015-2021 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 bandwidth
//go:generate msgp -file=$GOFILE -unexported
import (
"context"
"sync"
"time"
"golang.org/x/time/rate"
)
//msgp:ignore bucketThrottle Monitor
type bucketThrottle struct {
*rate.Limiter
NodeBandwidthPerSec int64
}
// Monitor holds the state of the global bucket monitor
type Monitor struct {
tlock sync.RWMutex // mutex for bucket throttling
mlock sync.RWMutex // mutex for bucket measurement
bucketsThrottle map[BucketOptions]*bucketThrottle
bucketsMeasurement map[BucketOptions]*bucketMeasurement // Buckets with objects in flight
bucketMovingAvgTicker *time.Ticker // Ticker for calculating moving averages
ctx context.Context // Context for generate
NodeCount uint64
}
// NewMonitor returns a monitor with defaults.
func NewMonitor(ctx context.Context, numNodes uint64) *Monitor {
m := &Monitor{
bucketsMeasurement: make(map[BucketOptions]*bucketMeasurement),
bucketsThrottle: make(map[BucketOptions]*bucketThrottle),
bucketMovingAvgTicker: time.NewTicker(2 * time.Second),
ctx: ctx,
NodeCount: numNodes,
}
go m.trackEWMA()
return m
}
func (m *Monitor) updateMeasurement(opts BucketOptions, bytes uint64) {
m.mlock.Lock()
defer m.mlock.Unlock()
tm, ok := m.bucketsMeasurement[opts]
if !ok {
tm = &bucketMeasurement{}
}
tm.incrementBytes(bytes)
m.bucketsMeasurement[opts] = tm
}
// SelectionFunction for buckets
type SelectionFunction func(bucket string) bool
// SelectBuckets will select all the buckets passed in.
func SelectBuckets(buckets ...string) SelectionFunction {
if len(buckets) == 0 {
return func(bucket string) bool {
return true
}
}
return func(bucket string) bool {
for _, bkt := range buckets {
if bkt == bucket {
return true
}
}
return false
}
}
// Details for the measured bandwidth
type Details struct {
LimitInBytesPerSecond int64 `json:"limitInBits"`
CurrentBandwidthInBytesPerSecond float64 `json:"currentBandwidth"`
}
// BucketBandwidthReport captures the details for all buckets.
type BucketBandwidthReport struct {
BucketStats map[BucketOptions]Details `json:"bucketStats,omitempty"`
}
// GetReport gets the report for all bucket bandwidth details.
func (m *Monitor) GetReport(selectBucket SelectionFunction) *BucketBandwidthReport {
m.mlock.RLock()
defer m.mlock.RUnlock()
return m.getReport(selectBucket)
}
func (m *Monitor) getReport(selectBucket SelectionFunction) *BucketBandwidthReport {
report := &BucketBandwidthReport{
BucketStats: make(map[BucketOptions]Details),
}
for bucketOpts, bucketMeasurement := range m.bucketsMeasurement {
if !selectBucket(bucketOpts.Name) {
continue
}
m.tlock.RLock()
if tgtThrottle, ok := m.bucketsThrottle[bucketOpts]; ok {
currBw := bucketMeasurement.getExpMovingAvgBytesPerSecond()
report.BucketStats[bucketOpts] = Details{
LimitInBytesPerSecond: tgtThrottle.NodeBandwidthPerSec * int64(m.NodeCount),
CurrentBandwidthInBytesPerSecond: currBw,
}
}
m.tlock.RUnlock()
}
return report
}
func (m *Monitor) trackEWMA() {
for {
select {
case <-m.bucketMovingAvgTicker.C:
m.updateMovingAvg()
case <-m.ctx.Done():
return
}
}
}
func (m *Monitor) updateMovingAvg() {
m.mlock.Lock()
defer m.mlock.Unlock()
for _, bucketMeasurement := range m.bucketsMeasurement {
bucketMeasurement.updateExponentialMovingAverage(time.Now())
}
}
func (m *Monitor) init(opts BucketOptions) {
m.mlock.Lock()
defer m.mlock.Unlock()
_, ok := m.bucketsMeasurement[opts]
if !ok {
m.bucketsMeasurement[opts] = newBucketMeasurement(time.Now())
}
}
// DeleteBucket deletes monitoring the 'bucket'
func (m *Monitor) DeleteBucket(bucket string) {
m.tlock.Lock()
for opts := range m.bucketsThrottle {
if opts.Name == bucket {
delete(m.bucketsThrottle, opts)
}
}
m.tlock.Unlock()
m.mlock.Lock()
for opts := range m.bucketsMeasurement {
if opts.Name == bucket {
delete(m.bucketsMeasurement, opts)
}
}
m.mlock.Unlock()
}
// DeleteBucketThrottle deletes monitoring for a bucket's target
func (m *Monitor) DeleteBucketThrottle(bucket, arn string) {
m.tlock.Lock()
delete(m.bucketsThrottle, BucketOptions{Name: bucket, ReplicationARN: arn})
m.tlock.Unlock()
m.mlock.Lock()
delete(m.bucketsMeasurement, BucketOptions{Name: bucket, ReplicationARN: arn})
m.mlock.Unlock()
}
// throttle returns currently configured throttle for this bucket
func (m *Monitor) throttle(opts BucketOptions) *bucketThrottle {
m.tlock.RLock()
defer m.tlock.RUnlock()
return m.bucketsThrottle[opts]
}
// SetBandwidthLimit sets the bandwidth limit for a bucket
func (m *Monitor) SetBandwidthLimit(bucket, arn string, limit int64) {
m.tlock.Lock()
defer m.tlock.Unlock()
limitBytes := limit / int64(m.NodeCount)
throttle, ok := m.bucketsThrottle[BucketOptions{Name: bucket, ReplicationARN: arn}]
if !ok {
throttle = &bucketThrottle{}
}
throttle.NodeBandwidthPerSec = limitBytes
throttle.Limiter = rate.NewLimiter(rate.Limit(float64(limitBytes)), int(limitBytes))
m.bucketsThrottle[BucketOptions{Name: bucket, ReplicationARN: arn}] = throttle
}
// IsThrottled returns true if a bucket has bandwidth throttling enabled.
func (m *Monitor) IsThrottled(bucket, arn string) bool {
m.tlock.RLock()
defer m.tlock.RUnlock()
_, ok := m.bucketsThrottle[BucketOptions{Name: bucket, ReplicationARN: arn}]
return ok
}