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config.go
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config.go
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// Copyright 2016 PingCAP, 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,
// See the License for the specific language governing permissions and
// limitations under the License.
package server
import (
"flag"
"fmt"
"net/url"
"strings"
"sync/atomic"
"time"
"github.com/BurntSushi/toml"
"github.com/coreos/etcd/embed"
"github.com/juju/errors"
"github.com/pingcap/pd/pkg/logutil"
"github.com/pingcap/pd/pkg/metricutil"
"github.com/pingcap/pd/pkg/typeutil"
)
// Config is the pd server configuration.
type Config struct {
*flag.FlagSet `json:"-"`
Version bool `json:"-"`
ClientUrls string `toml:"client-urls" json:"client-urls"`
PeerUrls string `toml:"peer-urls" json:"peer-urls"`
AdvertiseClientUrls string `toml:"advertise-client-urls" json:"advertise-client-urls"`
AdvertisePeerUrls string `toml:"advertise-peer-urls" json:"advertise-peer-urls"`
Name string `toml:"name" json:"name"`
DataDir string `toml:"data-dir" json:"data-dir"`
InitialCluster string `toml:"initial-cluster" json:"initial-cluster"`
InitialClusterState string `toml:"initial-cluster-state" json:"initial-cluster-state"`
// Join to an existing pd cluster, a string of endpoints.
Join string `toml:"join" json:"join"`
// LeaderLease time, if leader doesn't update its TTL
// in etcd after lease time, etcd will expire the leader key
// and other servers can campaign the leader again.
// Etcd onlys support seoncds TTL, so here is second too.
LeaderLease int64 `toml:"lease" json:"lease"`
// Log related config.
Log logutil.LogConfig `toml:"log" json:"log"`
// Backward compatibility.
LogFileDeprecated string `toml:"log-file" json:"log-file"`
LogLevelDeprecated string `toml:"log-level" json:"log-level"`
// TsoSaveInterval is the interval to save timestamp.
TsoSaveInterval typeutil.Duration `toml:"tso-save-interval" json:"tso-save-interval"`
Metric metricutil.MetricConfig `toml:"metric" json:"metric"`
Schedule ScheduleConfig `toml:"schedule" json:"schedule"`
Replication ReplicationConfig `toml:"replication" json:"replication"`
// QuotaBackendBytes Raise alarms when backend size exceeds the given quota. 0 means use the default quota.
// the default size is 2GB, the maximum is 8GB.
QuotaBackendBytes typeutil.ByteSize `toml:"quota-backend-bytes" json:"quota-backend-bytes"`
// AutoCompactionRetention for mvcc key value store in hour. 0 means disable auto compaction.
// the default retention is 1 hour
AutoCompactionRetention int `toml:"auto-compaction-retention" json:"auto-compaction-retention"`
tickMs uint64
electionMs uint64
configFile string
// For all warnings during parsing.
WarningMsgs []string
// Only test can change them.
nextRetryDelay time.Duration
disableStrictReconfigCheck bool
}
// NewConfig creates a new config.
func NewConfig() *Config {
cfg := &Config{}
cfg.FlagSet = flag.NewFlagSet("pd", flag.ContinueOnError)
fs := cfg.FlagSet
fs.BoolVar(&cfg.Version, "V", false, "print version information and exit")
fs.BoolVar(&cfg.Version, "version", false, "print version information and exit")
fs.StringVar(&cfg.configFile, "config", "", "Config file")
fs.StringVar(&cfg.Name, "name", defaultName, "human-readable name for this pd member")
fs.StringVar(&cfg.DataDir, "data-dir", "", "path to the data directory (default 'default.${name}')")
fs.StringVar(&cfg.ClientUrls, "client-urls", defaultClientUrls, "url for client traffic")
fs.StringVar(&cfg.AdvertiseClientUrls, "advertise-client-urls", "", "advertise url for client traffic (default '${client-urls}')")
fs.StringVar(&cfg.PeerUrls, "peer-urls", defaultPeerUrls, "url for peer traffic")
fs.StringVar(&cfg.AdvertisePeerUrls, "advertise-peer-urls", "", "advertise url for peer traffic (default '${peer-urls}')")
fs.StringVar(&cfg.InitialCluster, "initial-cluster", "", "initial cluster configuration for bootstrapping, e,g. pd=http://127.0.0.1:2380")
fs.StringVar(&cfg.Join, "join", "", "join to an existing cluster (usage: cluster's '${advertise-client-urls}'")
fs.StringVar(&cfg.Log.Level, "L", "", "log level: debug, info, warn, error, fatal (default 'info')")
fs.StringVar(&cfg.Log.File.Filename, "log-file", "", "log file path")
fs.BoolVar(&cfg.Log.File.LogRotate, "log-rotate", true, "rotate log")
return cfg
}
const (
defaultLeaderLease = int64(3)
defaultNextRetryDelay = time.Second
defaultAutoCompactionRetention = 1
defaultName = "pd"
defaultClientUrls = "http://127.0.0.1:2379"
defaultPeerUrls = "http://127.0.0.1:2380"
defualtInitialClusterState = embed.ClusterStateFlagNew
// etcd use 100ms for heartbeat and 1s for election timeout.
// We can enlarge both a little to reduce the network aggression.
// now embed etcd use TickMs for heartbeat, we will update
// after embed etcd decouples tick and heartbeat.
defaultTickMs = uint64(500)
// embed etcd has a check that `5 * tick > election`
defaultElectionMs = uint64(3000)
)
func adjustString(v *string, defValue string) {
if len(*v) == 0 {
*v = defValue
}
}
func adjustUint64(v *uint64, defValue uint64) {
if *v == 0 {
*v = defValue
}
}
func adjustInt64(v *int64, defValue int64) {
if *v == 0 {
*v = defValue
}
}
func adjustFloat64(v *float64, defValue float64) {
if *v == 0 {
*v = defValue
}
}
func adjustDuration(v *typeutil.Duration, defValue time.Duration) {
if v.Duration == 0 {
v.Duration = defValue
}
}
// Parse parses flag definitions from the argument list.
func (c *Config) Parse(arguments []string) error {
// Parse first to get config file.
err := c.FlagSet.Parse(arguments)
if err != nil {
return errors.Trace(err)
}
// Load config file if specified.
if c.configFile != "" {
err = c.configFromFile(c.configFile)
if err != nil {
return errors.Trace(err)
}
// Backward compatibility for toml config
if c.LogFileDeprecated != "" && c.Log.File.Filename == "" {
c.Log.File.Filename = c.LogFileDeprecated
msg := fmt.Sprintf("log-file in %s is deprecated, use [log.file] instead", c.configFile)
c.WarningMsgs = append(c.WarningMsgs, msg)
}
if c.LogLevelDeprecated != "" && c.Log.Level == "" {
c.Log.Level = c.LogLevelDeprecated
msg := fmt.Sprintf("log-level in %s is deprecated, use [log] instead", c.configFile)
c.WarningMsgs = append(c.WarningMsgs, msg)
}
}
// Parse again to replace with command line options.
err = c.FlagSet.Parse(arguments)
if err != nil {
return errors.Trace(err)
}
if len(c.FlagSet.Args()) != 0 {
return errors.Errorf("'%s' is an invalid flag", c.FlagSet.Arg(0))
}
err = c.adjust()
return errors.Trace(err)
}
func (c *Config) validate() error {
if c.Join != "" && c.InitialCluster != "" {
return errors.New("-initial-cluster and -join can not be provided at the same time")
}
return nil
}
func (c *Config) adjust() error {
if err := c.validate(); err != nil {
return errors.Trace(err)
}
adjustString(&c.Name, defaultName)
adjustString(&c.DataDir, fmt.Sprintf("default.%s", c.Name))
adjustString(&c.ClientUrls, defaultClientUrls)
adjustString(&c.AdvertiseClientUrls, c.ClientUrls)
adjustString(&c.PeerUrls, defaultPeerUrls)
adjustString(&c.AdvertisePeerUrls, c.PeerUrls)
if len(c.InitialCluster) == 0 {
// The advertise peer urls may be http://127.0.0.1:2380,http://127.0.0.1:2381
// so the initial cluster is pd=http://127.0.0.1:2380,pd=http://127.0.0.1:2381
items := strings.Split(c.AdvertisePeerUrls, ",")
sep := ""
for _, item := range items {
c.InitialCluster += fmt.Sprintf("%s%s=%s", sep, c.Name, item)
sep = ","
}
}
adjustString(&c.InitialClusterState, defualtInitialClusterState)
adjustInt64(&c.LeaderLease, defaultLeaderLease)
adjustDuration(&c.TsoSaveInterval, time.Duration(defaultLeaderLease)*time.Second)
if c.nextRetryDelay == 0 {
c.nextRetryDelay = defaultNextRetryDelay
}
if c.AutoCompactionRetention == 0 {
c.AutoCompactionRetention = defaultAutoCompactionRetention
}
adjustUint64(&c.tickMs, defaultTickMs)
adjustUint64(&c.electionMs, defaultElectionMs)
adjustString(&c.Metric.PushJob, c.Name)
c.Schedule.adjust()
c.Replication.adjust()
return nil
}
func (c *Config) clone() *Config {
cfg := &Config{}
*cfg = *c
return cfg
}
func (c *Config) String() string {
if c == nil {
return "<nil>"
}
return fmt.Sprintf("Config(%+v)", *c)
}
// configFromFile loads config from file.
func (c *Config) configFromFile(path string) error {
_, err := toml.DecodeFile(path, c)
return errors.Trace(err)
}
// ScheduleConfig is the schedule configuration.
type ScheduleConfig struct {
// If the snapshot count of one store is greater than this value,
// it will never be used as a source or target store.
MaxSnapshotCount uint64 `toml:"max-snapshot-count,omitempty" json:"max-snapshot-count"`
// MaxStoreDownTime is the max duration after which
// a store will be considered to be down if it hasn't reported heartbeats.
MaxStoreDownTime typeutil.Duration `toml:"max-store-down-time,omitempty" json:"max-store-down-time"`
// LeaderScheduleLimit is the max coexist leader schedules.
LeaderScheduleLimit uint64 `toml:"leader-schedule-limit,omitempty" json:"leader-schedule-limit"`
// RegionScheduleLimit is the max coexist region schedules.
RegionScheduleLimit uint64 `toml:"region-schedule-limit,omitempty" json:"region-schedule-limit"`
// ReplicaScheduleLimit is the max coexist replica schedules.
ReplicaScheduleLimit uint64 `toml:"replica-schedule-limit,omitempty" json:"replica-schedule-limit"`
}
const (
defaultMaxReplicas = 3
defaultMaxSnapshotCount = 3
defaultMaxStoreDownTime = time.Hour
defaultLeaderScheduleLimit = 64
defaultRegionScheduleLimit = 12
defaultReplicaScheduleLimit = 16
)
func (c *ScheduleConfig) adjust() {
adjustUint64(&c.MaxSnapshotCount, defaultMaxSnapshotCount)
adjustDuration(&c.MaxStoreDownTime, defaultMaxStoreDownTime)
adjustUint64(&c.LeaderScheduleLimit, defaultLeaderScheduleLimit)
adjustUint64(&c.RegionScheduleLimit, defaultRegionScheduleLimit)
adjustUint64(&c.ReplicaScheduleLimit, defaultReplicaScheduleLimit)
}
// ReplicationConfig is the replication configuration.
type ReplicationConfig struct {
// MaxReplicas is the number of replicas for each region.
MaxReplicas uint64 `toml:"max-replicas,omitempty" json:"max-replicas"`
// The label keys specified the location of a store.
// The placement priorities is implied by the order of label keys.
// For example, ["zone", "rack"] means that we should place replicas to
// different zones first, then to different racks if we don't have enough zones.
LocationLabels typeutil.StringSlice `toml:"location-labels,omitempty" json:"location-labels"`
}
func (c *ReplicationConfig) clone() *ReplicationConfig {
locationLabels := make(typeutil.StringSlice, 0, len(c.LocationLabels))
copy(locationLabels, c.LocationLabels)
return &ReplicationConfig{
MaxReplicas: c.MaxReplicas,
LocationLabels: locationLabels,
}
}
func (c *ReplicationConfig) adjust() {
adjustUint64(&c.MaxReplicas, defaultMaxReplicas)
}
// scheduleOption is a wrapper to access the configuration safely.
type scheduleOption struct {
v atomic.Value
rep *Replication
}
func newScheduleOption(cfg *Config) *scheduleOption {
o := &scheduleOption{}
o.store(&cfg.Schedule)
o.rep = newReplication(&cfg.Replication)
return o
}
func (o *scheduleOption) load() *ScheduleConfig {
return o.v.Load().(*ScheduleConfig)
}
func (o *scheduleOption) store(cfg *ScheduleConfig) {
o.v.Store(cfg)
}
func (o *scheduleOption) GetReplication() *Replication {
return o.rep
}
func (o *scheduleOption) GetMaxReplicas() int {
return o.rep.GetMaxReplicas()
}
func (o *scheduleOption) SetMaxReplicas(replicas int) {
o.rep.SetMaxReplicas(replicas)
}
func (o *scheduleOption) GetMaxSnapshotCount() uint64 {
return o.load().MaxSnapshotCount
}
func (o *scheduleOption) GetMaxStoreDownTime() time.Duration {
return o.load().MaxStoreDownTime.Duration
}
func (o *scheduleOption) GetLeaderScheduleLimit() uint64 {
return o.load().LeaderScheduleLimit
}
func (o *scheduleOption) GetRegionScheduleLimit() uint64 {
return o.load().RegionScheduleLimit
}
func (o *scheduleOption) GetReplicaScheduleLimit() uint64 {
return o.load().ReplicaScheduleLimit
}
func (o *scheduleOption) persist(kv *kv) error {
return kv.saveScheduleOption(o)
}
// ParseUrls parse a string into multiple urls.
// Export for api.
func ParseUrls(s string) ([]url.URL, error) {
items := strings.Split(s, ",")
urls := make([]url.URL, 0, len(items))
for _, item := range items {
u, err := url.Parse(item)
if err != nil {
return nil, errors.Trace(err)
}
urls = append(urls, *u)
}
return urls, nil
}
// generates a configuration for embedded etcd.
func (c *Config) genEmbedEtcdConfig() (*embed.Config, error) {
cfg := embed.NewConfig()
cfg.Name = c.Name
cfg.Dir = c.DataDir
cfg.WalDir = ""
cfg.InitialCluster = c.InitialCluster
cfg.ClusterState = c.InitialClusterState
cfg.EnablePprof = true
cfg.StrictReconfigCheck = !c.disableStrictReconfigCheck
cfg.TickMs = uint(c.tickMs)
cfg.ElectionMs = uint(c.electionMs)
cfg.AutoCompactionRetention = c.AutoCompactionRetention
cfg.QuotaBackendBytes = int64(c.QuotaBackendBytes)
var err error
cfg.LPUrls, err = ParseUrls(c.PeerUrls)
if err != nil {
return nil, errors.Trace(err)
}
cfg.APUrls, err = ParseUrls(c.AdvertisePeerUrls)
if err != nil {
return nil, errors.Trace(err)
}
cfg.LCUrls, err = ParseUrls(c.ClientUrls)
if err != nil {
return nil, errors.Trace(err)
}
cfg.ACUrls, err = ParseUrls(c.AdvertiseClientUrls)
if err != nil {
return nil, errors.Trace(err)
}
return cfg, nil
}