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avoid frequent DNS lookups for baremetal setups (#11972)

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bump up the DNS cache for baremetal setups upto 10 minutes
This commit is contained in:
Harshavardhana 2021-04-08 17:51:59 -07:00 committed by GitHub
parent 05a9108c24
commit 89d58bec16
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GPG Key ID: 4AEE18F83AFDEB23
3 changed files with 25 additions and 5 deletions
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10
cmd/common-main.go
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@ -59,7 +59,15 @@ func init() {
config.Logger.Info = logger.Info config.Logger.Info = logger.Info
config.Logger.LogIf = logger.LogIf config.Logger.LogIf = logger.LogIf
globalDNSCache = xhttp.NewDNSCache(10*time.Second, 10*time.Second, logger.LogOnceIf) if IsKubernetes() || IsDocker() || IsBOSH() || IsDCOS() || IsKubernetesReplicaSet() || IsPCFTile() {
// 30 seconds matches the orchestrator DNS TTLs, have
// a 5 second timeout to lookup from DNS servers.
globalDNSCache = xhttp.NewDNSCache(30*time.Second, 5*time.Second, logger.LogOnceIf)
} else {
// On bare-metals DNS do not change often, so it is
// safe to assume a higher timeout upto 10 minutes.
globalDNSCache = xhttp.NewDNSCache(10*time.Minute, 5*time.Second, logger.LogOnceIf)
}
initGlobalContext() initGlobalContext()

7
cmd/http/dial_dnscache.go
View File

@ -121,6 +121,8 @@ func NewDNSCache(freq time.Duration, lookupTimeout time.Duration, loggerOnce fun
doneCh: make(chan struct{}), doneCh: make(chan struct{}),
} }
rnd := rand.New(rand.NewSource(time.Now().UnixNano()))
timer := time.NewTimer(freq) timer := time.NewTimer(freq)
go func() { go func() {
defer timer.Stop() defer timer.Stop()
@ -128,7 +130,10 @@ func NewDNSCache(freq time.Duration, lookupTimeout time.Duration, loggerOnce fun
for { for {
select { select {
case <-timer.C: case <-timer.C:
timer.Reset(freq) // Make sure that refreshes on DNS do not be attempted
// at the same time, allows for reduced load on the
// DNS servers.
timer.Reset(time.Duration(rnd.Float64() * float64(freq)))
r.Refresh() r.Refresh()
case <-r.doneCh: case <-r.doneCh:

13
cmd/update.go
View File

@ -221,6 +221,11 @@ func IsSourceBuild() bool {
return err != nil return err != nil
} }
// IsPCFTile returns if server is running in PCF
func IsPCFTile() bool {
return env.Get("MINIO_PCF_TILE_VERSION", "") != ""
}
// DO NOT CHANGE USER AGENT STYLE. // DO NOT CHANGE USER AGENT STYLE.
// The style should be // The style should be
// //
@ -286,9 +291,11 @@ func getUserAgent(mode string) string {
} }
} }
pcfTileVersion := env.Get("MINIO_PCF_TILE_VERSION", "") if IsPCFTile() {
if pcfTileVersion != "" { pcfTileVersion := env.Get("MINIO_PCF_TILE_VERSION", "")
uaAppend(" MinIO/pcf-tile-", pcfTileVersion) if pcfTileVersion != "" {
uaAppend(" MinIO/pcf-tile-", pcfTileVersion)
}
} }
return strings.Join(userAgentParts, "") return strings.Join(userAgentParts, "")