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lib/promscrape: add -promscrape.discovery.concurrency and -promscrape.discovery.concurrentWaitTime flags for tuning the number of concurrent requests to autodiscovery API servers at Consul or Kubernetes

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This commit is contained in:
Aliaksandr Valialkin 2020-05-19 17:35:47 +03:00
parent 7d46dd452a
commit 73ec5cf460
1 changed files with 32 additions and 0 deletions
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32
lib/promscrape/discoveryutils/client.go
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@ -2,17 +2,26 @@ package discoveryutils
import (
"crypto/tls"
"flag"
"fmt"
"net"
"net/http"
"strings"
"sync"
"time"
"github.com/VictoriaMetrics/VictoriaMetrics/lib/netutil"
"github.com/VictoriaMetrics/VictoriaMetrics/lib/promauth"
"github.com/VictoriaMetrics/VictoriaMetrics/lib/timerpool"
"github.com/VictoriaMetrics/fasthttp"
)
var (
maxConcurrency = flag.Int("promscrape.discovery.concurrency", 500, "The maximum number of concurrent requests to Prometheus autodiscovery API (Consul, Kubernetes, etc.)")
maxWaitTime = flag.Duration("promscrape.discovery.concurrentWaitTime", time.Minute, "The maximum duration for waiting to perform API requests "+
"if more than -promscrape.discovery.concurrency requests are simultaneously performed")
)
var defaultClient = &http.Client{
Timeout: 30 * time.Second,
}
@ -56,6 +65,7 @@ func NewClient(apiServer string, ac *promauth.Config) (*Client, error) {
ReadTimeout: time.Minute,
WriteTimeout: 10 * time.Second,
MaxResponseBodySize: 300 * 1024 * 1024,
MaxConns: *maxConcurrency,
}
return &Client{
hc: hc,
@ -65,8 +75,30 @@ func NewClient(apiServer string, ac *promauth.Config) (*Client, error) {
}, nil
}
var (
concurrencyLimitCh chan struct{}
concurrencyLimitChOnce sync.Once
)
func concurrencyLimitChInit() {
concurrencyLimitCh = make(chan struct{}, *maxConcurrency)
}
// GetAPIResponse returns response for the given absolute path.
func (c *Client) GetAPIResponse(path string) ([]byte, error) {
// Limit the number of concurrent API requests.
concurrencyLimitChOnce.Do(concurrencyLimitChInit)
t := timerpool.Get(*maxWaitTime)
select {
case concurrencyLimitCh <- struct{}{}:
timerpool.Put(t)
case <-t.C:
timerpool.Put(t)
return nil, fmt.Errorf("too many outstanding requests to %q; try increasing -promscrape.discovery.concurrentWaitTime=%s or -promscrape.discovery.concurrency=%d",
c.apiServer, *maxWaitTime, *maxConcurrency)
}
defer func() { <-concurrencyLimitCh }()
requestURL := c.apiServer + path
var u fasthttp.URI
u.Update(requestURL)