tidb advancer_conf 源码
tidb advancer_conf 代码
文件路径：/br/pkg/streamhelper/config/advancer_conf.go
// Copyright 2022 PingCAP, Inc. Licensed under Apache-2.0.
package config
import (
"time"
"github.com/spf13/pflag"
)
const (
flagBackoffTime = "backoff-time"
flagTickInterval = "tick-interval"
flagFullScanDiffTick = "full-scan-tick"
flagAdvancingByCache = "advancing-by-cache"
DefaultConsistencyCheckTick = 5
DefaultTryAdvanceThreshold = 108 * time.Second
DefaultBackOffTime = 5 * time.Second
DefaultTickInterval = 12 * time.Second
DefaultFullScanTick = 4
DefaultAdvanceByCache = true
)
var (
DefaultMaxConcurrencyAdvance = 8
)
type Config struct {
// The gap between two retries.
BackoffTime time.Duration `toml:"backoff-time" json:"backoff-time"`
// The gap between calculating checkpoints.
TickDuration time.Duration `toml:"tick-interval" json:"tick-interval"`
// The backoff time of full scan.
FullScanTick int `toml:"full-scan-tick" json:"full-scan-tick"`
// Whether enable the optimization -- use a cached heap to advancing the global checkpoint.
// This may reduce the gap of checkpoint but may cost more CPU.
AdvancingByCache bool `toml:"advancing-by-cache" json:"advancing-by-cache"`
}
func DefineFlagsForCheckpointAdvancerConfig(f *pflag.FlagSet) {
f.Duration(flagBackoffTime, DefaultBackOffTime, "The gap between two retries.")
f.Duration(flagTickInterval, DefaultTickInterval, "From how long we trigger the tick (advancing the checkpoint).")
f.Bool(flagAdvancingByCache, DefaultAdvanceByCache, "Whether enable the optimization -- use a cached heap to advancing the global checkpoint.")
f.Int(flagFullScanDiffTick, DefaultFullScanTick, "The backoff of full scan.")
}
func Default() Config {
return Config{
BackoffTime: DefaultBackOffTime,
TickDuration: DefaultTickInterval,
FullScanTick: DefaultFullScanTick,
AdvancingByCache: DefaultAdvanceByCache,
}
}
func (conf *Config) GetFromFlags(f *pflag.FlagSet) error {
var err error
conf.BackoffTime, err = f.GetDuration(flagBackoffTime)
if err != nil {
return err
}
conf.TickDuration, err = f.GetDuration(flagTickInterval)
if err != nil {
return err
}
conf.FullScanTick, err = f.GetInt(flagFullScanDiffTick)
if err != nil {
return err
}
conf.AdvancingByCache, err = f.GetBool(flagAdvancingByCache)
if err != nil {
return err
}
return nil
}
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