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vmalert: make maxIdleConnections configurable for datasource HTTP client (#797)

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Address https://github.com/VictoriaMetrics/VictoriaMetrics/issues/795
This commit is contained in:
Roman Khavronenko 2020-09-30 07:49:45 +01:00 committed by GitHub
parent a44e0c6153
commit daa2d1c065
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2 changed files with 6 additions and 1 deletions
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4
app/vmalert/README.md
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@ -166,8 +166,10 @@ The shortlist of configuration flags is the following:
Optional basic auth password for -datasource.url
-datasource.basicAuth.username string
Optional basic auth username for -datasource.url
-datasource.lookback duration
-datasource.lookback duration
Lookback defines how far to look into past when evaluating queries. For example, if datasource.lookback=5m then param "time" with value now()-5m will be added to every query.
-datasource.maxIdleConnections int
Defines the number of idle (keep-alive connections) to configured datasource.Consider to set this value equal to the value: groups_total * group.concurrency. Too low value may result into high number of sockets in TIME_WAIT state. (default 100)
-datasource.tlsCAFile string
Optional path to TLS CA file to use for verifying connections to -datasource.url. By default system CA is used
-datasource.tlsCertFile string

3
app/vmalert/datasource/init.go
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@ -24,6 +24,8 @@ var (
lookBack = flag.Duration("datasource.lookback", 0, "Lookback defines how far to look into past when evaluating queries. "+
"For example, if datasource.lookback=5m then param \"time\" with value now()-5m will be added to every query.")
maxIdleConnections = flag.Int("datasource.maxIdleConnections", 100, "Defines the number of idle (keep-alive connections) to configured datasource."+
"Consider to set this value equal to the value: groups_total * group.concurrency. Too low value may result into high number of sockets in TIME_WAIT state.")
)
// Init creates a Querier from provided flag values.
@ -36,6 +38,7 @@ func Init() (Querier, error) {
if err != nil {
return nil, fmt.Errorf("failed to create transport: %w", err)
}
tr.MaxIdleConns = *maxIdleConnections
c := &http.Client{Transport: tr}
return NewVMStorage(*addr, *basicAuthUsername, *basicAuthPassword, *lookBack, c), nil
}