How to configure tomcat and Hystrix for Spring Cloud

This article mainly explains "how to configure tomcat and Hystrix in Spring Cloud". The content in the article is simple and clear, and it is easy to learn and understand. Please follow the editor's train of thought to study and learn how to configure tomcat and Hystrix in Spring Cloud.

1. Replace tomcat

First, replace tomcat with undertow. Under the pressure test of Jmeter, undertow is twice as high as tomcat. The first step is to modify pom to remove tomcat.

Org.springframework.boot spring-boot-starter-web org.springframework.boot spring-boot-starter-tomcat org.springframework.boot spring-boot-starter-undertow

Step 2, configure

Server: undertow: max-http-post-size: thread sets the number of I / O threads, which mainly perform non-blocking tasks. They are responsible for multiple connections. By default, one thread per CPU core is set as the number of CPU cores. Io-threads: blocking task thread pool. When performing a similar servlet request blocking operation, undertow will get threads from this thread pool. Its value setting depends on the load of the system. The following configurations io-threads*8 worker-threads: 3pm will affect buffer. These buffer will be used for IO operations of server connections, which is somewhat similar to netty's pooled memory management # the space size of each buffer, the smaller the space is utilized, the more fully buffer-size: 102 the number of buffer allocated per zone. So the size of pool is buffer-size * buffers-per-region# buffers-per-region: 1024 # this parameter does not need to write # whether to allocate direct memory direct-buffers: true2, replace HTTPClient

The first step is to increase dependence

Io.github.openfeign feign-httpclient

The second part, configure in application.yml or bootstrap.yml

# feign configuration feign: hystrix: # enable hystrix function in feign. By default, feign does not enable hystrix feature enabled: true # # configure httpclient thread pool httpclient: enabled: true okhttp: enabled: false

Step 3, configure HTTPClient Bean

Import java.util.Timer;import java.util.TimerTask;import java.util.concurrent.TimeUnit;import org.apache.http.client.HttpClient;import org.apache.http.client.config.RequestConfig;import org.apache.http.impl.client.DefaultConnectionKeepAliveStrategy;import org.apache.http.impl.client.HttpClientBuilder;import org.apache.http.impl.conn.PoolingHttpClientConnectionManager;import org.springframework.context.annotation.Bean;import org.springframework.context.annotation.Configuration @ Configurationpublic class HttpPool {@ Bean public HttpClient httpClient () {System.out.println ("= Apache httpclient initialization connection pool start ="); / / generate default request configuration RequestConfig.Builder requestConfigBuilder = RequestConfig.custom (); / / timeout requestConfigBuilder.setSocketTimeout (5 * 1000); / / connection time requestConfigBuilder.setConnectTimeout (5 * 1000) RequestConfig defaultRequestConfig = requestConfigBuilder.build (); / / connection pool configuration / / persistent connections for 30 seconds final PoolingHttpClientConnectionManager pollingConnectionManager = new PoolingHttpClientConnectionManager (30, TimeUnit.MILLISECONDS); / / total number of connections pollingConnectionManager.setMaxTotal (1000); / / concurrency of the same route pollingConnectionManager.setDefaultMaxPerRoute (1000); / / httpclient configuration HttpClientBuilder httpClientBuilder = HttpClientBuilder.create () / / to maintain the persistent connection configuration, you need to add Keep-Alive httpClientBuilder.setKeepAliveStrategy (new DefaultConnectionKeepAliveStrategy ()); httpClientBuilder.setConnectionManager (pollingConnectionManager); httpClientBuilder.setDefaultRequestConfig (defaultRequestConfig); HttpClient client = httpClientBuilder.build () in the header; / / start the timer to regularly reclaim expired connections Timer timer = new Timer () Timer.schedule (new TimerTask () {@ Override public void run () {System.out.println ("= closeIdleConnections==="); pollingConnectionManager.closeExpiredConnections (); pollingConnectionManager.closeIdleConnections (5, TimeUnit.SECONDS);}, 10 * 1000, 5 * 1000) System.out.println ("= Apache httpclient initialization connection pool finished ="); return client;}} 3, configure Hystrix

The first step is dependence.

Org.springframework.cloud spring-cloud-starter-hystrix

Step 2, configure

# configure hystrix parameters hystrix: threadpool: # default: default parameter, the role of all hystrix clients, if required for a specific interface You can write the interface + method name default: coreSize: 500command: default: fallback: # whether to enable the fallback method enabled: true execution: isolation: thread: timeoutInMilliseconds: 30000 # default is 1000 Thank you for reading, this is the content of "how to configure tomcat and Hystrix for Spring Cloud", after the study of this article I believe that you have a deeper understanding of how to configure tomcat and Hystrix in Spring Cloud, and the specific use needs to be verified in practice. Here is, the editor will push for you more related knowledge points of the article, welcome to follow!