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lib/promscrape: exponentially increase retry interval on unsuccesful requests to scrape targets or to service discovery services

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This should reduce CPU load at vmagent and at remote side when the remote side doesn't accept HTTP requests.

Updates https://github.com/VictoriaMetrics/VictoriaMetrics/issues/1289
This commit is contained in:
Aliaksandr Valialkin 2021-05-13 10:38:43 +03:00
parent 66c6976723
commit d13906bf1f
2 changed files with 16 additions and 2 deletions
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9
lib/promscrape/client.go
View file

@ -299,6 +299,7 @@ var (
) )
func doRequestWithPossibleRetry(hc *fasthttp.HostClient, req *fasthttp.Request, resp *fasthttp.Response, deadline time.Time) error { func doRequestWithPossibleRetry(hc *fasthttp.HostClient, req *fasthttp.Request, resp *fasthttp.Response, deadline time.Time) error {
sleepTime := time.Second
for { for {
// Use DoDeadline instead of Do even if hc.ReadTimeout is already set in order to guarantee the given deadline // Use DoDeadline instead of Do even if hc.ReadTimeout is already set in order to guarantee the given deadline
// across multiple retries. // across multiple retries.
@ -310,9 +311,15 @@ func doRequestWithPossibleRetry(hc *fasthttp.HostClient, req *fasthttp.Request,
return err return err
} }
// Retry request if the server closes the keep-alive connection unless deadline exceeds. // Retry request if the server closes the keep-alive connection unless deadline exceeds.
if time.Since(deadline) >= 0 { maxSleepTime := time.Until(deadline)
if sleepTime > maxSleepTime {
return fmt.Errorf("the server closes all the connection attempts: %w", err) return fmt.Errorf("the server closes all the connection attempts: %w", err)
} }
sleepTime += sleepTime
if sleepTime > maxSleepTime {
maxSleepTime = maxSleepTime
}
time.Sleep(sleepTime)
scrapeRetries.Inc() scrapeRetries.Inc()
} }
} }

9
lib/promscrape/discoveryutils/client.go
View file

@ -222,6 +222,7 @@ func (c *Client) getAPIResponseWithParamsAndClient(client *fasthttp.HostClient,
} }
func doRequestWithPossibleRetry(hc *fasthttp.HostClient, req *fasthttp.Request, resp *fasthttp.Response, deadline time.Time) error { func doRequestWithPossibleRetry(hc *fasthttp.HostClient, req *fasthttp.Request, resp *fasthttp.Response, deadline time.Time) error {
sleepTime := time.Second
discoveryRequests.Inc() discoveryRequests.Inc()
for { for {
// Use DoDeadline instead of Do even if hc.ReadTimeout is already set in order to guarantee the given deadline // Use DoDeadline instead of Do even if hc.ReadTimeout is already set in order to guarantee the given deadline
@ -234,9 +235,15 @@ func doRequestWithPossibleRetry(hc *fasthttp.HostClient, req *fasthttp.Request,
return err return err
} }
// Retry request if the server closes the keep-alive connection unless deadline exceeds. // Retry request if the server closes the keep-alive connection unless deadline exceeds.
if time.Since(deadline) >= 0 { maxSleepTime := time.Until(deadline)
if sleepTime > maxSleepTime {
return fmt.Errorf("the server closes all the connection attempts: %w", err) return fmt.Errorf("the server closes all the connection attempts: %w", err)
} }
sleepTime += sleepTime
if sleepTime > maxSleepTime {
sleepTime = maxSleepTime
}
time.Sleep(sleepTime)
discoveryRetries.Inc() discoveryRetries.Inc()
} }
} }