mirror of
https://github.com/k3s-io/k3s.git
synced 2024-06-07 19:41:36 +00:00
129 lines
3.4 KiB
Go
129 lines
3.4 KiB
Go
// Copyright 2015 The etcd Authors
|
|
//
|
|
// 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 v2stats
|
|
|
|
import (
|
|
"encoding/json"
|
|
"math"
|
|
"sync"
|
|
"time"
|
|
)
|
|
|
|
// LeaderStats is used by the leader in an etcd cluster, and encapsulates
|
|
// statistics about communication with its followers
|
|
type LeaderStats struct {
|
|
leaderStats
|
|
sync.Mutex
|
|
}
|
|
|
|
type leaderStats struct {
|
|
// Leader is the ID of the leader in the etcd cluster.
|
|
// TODO(jonboulle): clarify that these are IDs, not names
|
|
Leader string `json:"leader"`
|
|
Followers map[string]*FollowerStats `json:"followers"`
|
|
}
|
|
|
|
// NewLeaderStats generates a new LeaderStats with the given id as leader
|
|
func NewLeaderStats(id string) *LeaderStats {
|
|
return &LeaderStats{
|
|
leaderStats: leaderStats{
|
|
Leader: id,
|
|
Followers: make(map[string]*FollowerStats),
|
|
},
|
|
}
|
|
}
|
|
|
|
func (ls *LeaderStats) JSON() []byte {
|
|
ls.Lock()
|
|
stats := ls.leaderStats
|
|
ls.Unlock()
|
|
b, err := json.Marshal(stats)
|
|
// TODO(jonboulle): appropriate error handling?
|
|
if err != nil {
|
|
plog.Errorf("error marshalling leader stats (%v)", err)
|
|
}
|
|
return b
|
|
}
|
|
|
|
func (ls *LeaderStats) Follower(name string) *FollowerStats {
|
|
ls.Lock()
|
|
defer ls.Unlock()
|
|
fs, ok := ls.Followers[name]
|
|
if !ok {
|
|
fs = &FollowerStats{}
|
|
fs.Latency.Minimum = 1 << 63
|
|
ls.Followers[name] = fs
|
|
}
|
|
return fs
|
|
}
|
|
|
|
// FollowerStats encapsulates various statistics about a follower in an etcd cluster
|
|
type FollowerStats struct {
|
|
Latency LatencyStats `json:"latency"`
|
|
Counts CountsStats `json:"counts"`
|
|
|
|
sync.Mutex
|
|
}
|
|
|
|
// LatencyStats encapsulates latency statistics.
|
|
type LatencyStats struct {
|
|
Current float64 `json:"current"`
|
|
Average float64 `json:"average"`
|
|
averageSquare float64
|
|
StandardDeviation float64 `json:"standardDeviation"`
|
|
Minimum float64 `json:"minimum"`
|
|
Maximum float64 `json:"maximum"`
|
|
}
|
|
|
|
// CountsStats encapsulates raft statistics.
|
|
type CountsStats struct {
|
|
Fail uint64 `json:"fail"`
|
|
Success uint64 `json:"success"`
|
|
}
|
|
|
|
// Succ updates the FollowerStats with a successful send
|
|
func (fs *FollowerStats) Succ(d time.Duration) {
|
|
fs.Lock()
|
|
defer fs.Unlock()
|
|
|
|
total := float64(fs.Counts.Success) * fs.Latency.Average
|
|
totalSquare := float64(fs.Counts.Success) * fs.Latency.averageSquare
|
|
|
|
fs.Counts.Success++
|
|
|
|
fs.Latency.Current = float64(d) / (1000000.0)
|
|
|
|
if fs.Latency.Current > fs.Latency.Maximum {
|
|
fs.Latency.Maximum = fs.Latency.Current
|
|
}
|
|
|
|
if fs.Latency.Current < fs.Latency.Minimum {
|
|
fs.Latency.Minimum = fs.Latency.Current
|
|
}
|
|
|
|
fs.Latency.Average = (total + fs.Latency.Current) / float64(fs.Counts.Success)
|
|
fs.Latency.averageSquare = (totalSquare + fs.Latency.Current*fs.Latency.Current) / float64(fs.Counts.Success)
|
|
|
|
// sdv = sqrt(avg(x^2) - avg(x)^2)
|
|
fs.Latency.StandardDeviation = math.Sqrt(fs.Latency.averageSquare - fs.Latency.Average*fs.Latency.Average)
|
|
}
|
|
|
|
// Fail updates the FollowerStats with an unsuccessful send
|
|
func (fs *FollowerStats) Fail() {
|
|
fs.Lock()
|
|
defer fs.Unlock()
|
|
fs.Counts.Fail++
|
|
}
|