CODEWITHSUNDEEP
javaspringspring-bootspring-webfluxspring-webclient
membersound
membersound

Reputation: 86935

WebClient maxConnection pool limit?

How many concurrent requests can I send if the remote service if blocking? Means: what is the maxConnection pool limit that spring uses internally when using WebClient?

@Autowired
private WebClient webClient;

webClient.post().uri(url).syncBody(req).retrieve().bodyToMono(type);

And moreover: how can I modify it?

Upvotes: 6

Views: 40497

Answers (3)

Libin
Libin

Reputation: 165

Notice that only the default HttpClient (HttpClient.create()) uses 500 as the maximum number of active channels. In the example above, when instantiating a custom ConnectionProvider, we are changing this value to 50 using maxConnections. Also, if you don’t set this parameter the default maxConnections is used (2 * available number of processors).

If we configure custom ConnectionProvider, the default will be (2 * available number of processors) from the netty documentation

Upvotes: 0

Alexander Pankin
Alexander Pankin

Reputation: 3955

Before reactor-netty 0.9.0.M4 version there wasn't limit by default because of "elastic" connection provider was used. This fix changed it to "fixed" connection provider with the limit of 500.

To change the connection pool limit you could define your own WebClient.Builder bean and use it to create WebClient

@Bean
public WebClient.Builder webClientBuilder() {
    String connectionProviderName = "myConnectionProvider";
    int maxConnections = 100;
    int acquireTimeout = 1000;
    HttpClient httpClient = HttpClient.create(ConnectionProvider
            .fixed(connectionProviderName, maxConnections, acquireTimeout));
    return WebClient.builder()
            .clientConnector(new ReactorClientHttpConnector(httpClient));
}

Or you could implement custom org.springframework.boot.web.reactive.function.client.WebClientCustomizer in the same manner with the predefined WebClient.Builder

Upvotes: 14

Toerktumlare
Toerktumlare

Reputation: 14819

taken from the netty documentation

By default, the TCP client uses a “fixed” connection pool with 500 as the maximum number of the channels and 45s as the acquisition timeout.

Upvotes: 3

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