Number of threads
Note
This is the legacy RestClient. Please migrate to Rest5Client, a drop-in replacement with an up-to-date http library.
The Apache Http Async Client starts by default one dispatcher thread, and a number of worker threads used by the connection manager, as many as the number of locally detected processors (depending on what Runtime.getRuntime().availableProcessors() returns). The number of threads can be modified as follows:
RestClientBuilder builder = RestClient.builder(
new HttpHost("localhost", 9200))
.setHttpClientConfigCallback(new HttpClientConfigCallback() {
@Override
public HttpAsyncClientBuilder customizeHttpClient(
HttpAsyncClientBuilder httpClientBuilder) {
return httpClientBuilder.setDefaultIOReactorConfig(
IOReactorConfig.custom()
.setIoThreadCount(1)
.build());
}
});