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Read config values from environment for max_conns tuning

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- max_conns / idle / per host are now read from env-vars and have
defaults set to 1024 for both values
- logging / metrics are collected in the client transaction
rather than via defer (this may impact throughput)
- function cache moved to use RWMutex to try to improve latency
around locking when updating cache
- logging message added to show latency in running GetReplicas
because this was observed to increase in a linear fashion under
high concurrency
- changes tested against 3-node bare-metal 1.13 K8s cluster
with kubeadm

Signed-off-by: Alex Ellis (VMware) <alexellis2@gmail.com>
This commit is contained in:
Alex Ellis (VMware)
2019-01-22 15:59:32 +00:00
committed by Alex Ellis
parent 52c27e227a
commit 299e5a5933
7 changed files with 98 additions and 22 deletions
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2
gateway/server.go
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@ -57,7 +57,7 @@ func main() {
exporter.StartServiceWatcher(*config.FunctionsProviderURL, metricsOptions, "func", servicePollInterval)
metrics.RegisterExporter(exporter)
reverseProxy := types.NewHTTPClientReverseProxy(config.FunctionsProviderURL, config.UpstreamTimeout)
reverseProxy := types.NewHTTPClientReverseProxy(config.FunctionsProviderURL, config.UpstreamTimeout, config.MaxIdleConns, config.MaxIdleConnsPerHost)
loggingNotifier := handlers.LoggingNotifier{}
prometheusNotifier := handlers.PrometheusFunctionNotifier{