Does anyone have any idea on this?
On Mon, Jun 22, 2015 at 2:51 PM, Check Peck <comptechge...@gmail.com> wrote:
> I have a RestService running on 45 different machines in three datacenters
> (15 in each datacenter). I have a client which uses RestTemplate to call
> these machines depending on where the call is coming from. If the call is
> coming from DC1, then it will call my rest service running in DC1 and
> similarly for others.
>
> I am using RestTemplate with HttpComponentsClientHttpRequestFactory as
> shown below:
>
> public class DataProcess {
>
> private RestTemplate restTemplate = new RestTemplate();
> private ExecutorService service = Executors.newFixedThreadPool(15);
>
> // singleton class so only one instance
> public DataProcess() {
> restTemplate.setRequestFactory(clientHttpRequestFactory());
> }
>
> public DataResponse getData(DataKey key) {
> // do some stuff here which will internally call our
> RestService
> // by using DataKey object and using RestTemplate
> }
>
> private ClientHttpRequestFactory clientHttpRequestFactory() {
> HttpComponentsClientHttpRequestFactory requestFactory = new
> HttpComponentsClientHttpRequestFactory();
> RequestConfig requestConfig =
> RequestConfig.custom().setConnectionRequestTimeout(1000).setConnectTimeout(1000)
>
> .setSocketTimeout(1000).setStaleConnectionCheckEnabled(false).build();
> PoolingHttpClientConnectionManager
> poolingHttpClientConnectionManager = new
> PoolingHttpClientConnectionManager();
> poolingHttpClientConnectionManager.setMaxTotal(300);
> poolingHttpClientConnectionManager.setDefaultMaxPerRoute(300);
>
> CloseableHttpClient httpClientBuilder =
> HttpClientBuilder.create()
>
> .setConnectionManager(poolingHttpClientConnectionManager).setDefaultRequestConfig(requestConfig).build();
>
> requestFactory.setHttpClient(httpClientBuilder);
> return requestFactory;
> }
>
> }
>
> And this is the way people will call our library by passing dataKey object:
>
> DataResponse response =
> DataClientFactory.getInstance().getData(dataKey);
>
> *Now my question is:*
>
> 1) How to decide what should I choose for setMaxTotal and
> setDefaultMaxPerRoute in PoolingHttpClientConnectionManager object? As of
> now I am going with 300 for both of them? Should I go with 500 or something
> else?
>
> 2) Also do I need to turn off Nagle's algorithm (TCP_NODELAY) and turn on
> TCP keep-alive packets (SO_KEEPALIVE) for better performance here? If yes,
> then what's the right way to do this?
>
> I am trying to get best performance out of HttpClient. My client library
> will be used under very heavy load in multithreading project. I am using
> Apache HttpClient 4.3
>
