java – Spring RestTemplate SocketException快速连续执行时连接重置

本地运行的简单服务器和客户端应用服务器端点接收具有休眠时间的POST请求以模拟工作. Client是一个使用RestTemplate进行HTTP调用的SpringBoot应用程序.模拟每个请求在服务器上的500ms延迟并发出700个多线程请求.

问题

在快速连续执行客户端程序时,我得到java.net.SocketException：连接重置.堆栈跟踪：

org.springframework.web.client.ResourceAccessException: I/O error on POST request for "http://localhost:8081/server/site": Connection reset; nested exception is java.net.SocketException: Connection reset

java.util.concurrent.ExecutionException: org.springframework.web.client.ResourceAccessException: I/O error on POST request for "http://localhost:8081/server/site": Connection reset; nested exception is java.net.SocketException: Connection reset
at java.util.concurrent.FutureTask.report(FutureTask.java:122) ~[na:1.8.0_74]
at java.util.concurrent.FutureTask.get(FutureTask.java:192) ~[na:1.8.0_74]
at com.sample.client.rest.RestClient.invokeServer(RestClient.java:75) ~[classes/:na]
at com.sample.client.SampleClientApplication.main(SampleClientApplication.java:13) [classes/:na]

Caused by: org.springframework.web.client.ResourceAccessException: I/O error on POST request for "http://localhost:8081/server/site": Connection reset; nested exception is java.net.SocketException: Connection reset
at org.springframework.web.client.RestTemplate.doExecute(RestTemplate.java:673) ~[spring-web-4.3.13.RELEASE.jar:4.3.13.RELEASE]
at org.springframework.web.client.RestTemplate.execute(RestTemplate.java:620) ~[spring-web-4.3.13.RELEASE.jar:4.3.13.RELEASE]
at org.springframework.web.client.RestTemplate.postForEntity(RestTemplate.java:414) ~[spring-web-4.3.13.RELEASE.jar:4.3.13.RELEASE]
at com.sample.client.rest.RestClient.lambda$invokeServer$0(RestClient.java:68) ~[classes/:na]
at java.util.concurrent.FutureTask.run(FutureTask.java:266) ~[na:1.8.0_74]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) ~[na:1.8.0_74]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) ~[na:1.8.0_74]
at java.lang.Thread.run(Thread.java:745) ~[na:1.8.0_74]

Caused by: java.net.SocketException: Connection reset
at java.net.SocketInputStream.read(SocketInputStream.java:209) ~[na:1.8.0_74]
at java.net.SocketInputStream.read(SocketInputStream.java:141) ~[na:1.8.0_74]
at org.apache.http.impl.io.SessionInputBufferImpl.streamRead(SessionInputBufferImpl.java:137) ~[httpcore-4.4.8.jar:4.4.8]
at org.apache.http.impl.io.SessionInputBufferImpl.fillBuffer(SessionInputBufferImpl.java:153) ~[httpcore-4.4.8.jar:4.4.8]
at org.apache.http.impl.io.SessionInputBufferImpl.readLine(SessionInputBufferImpl.java:282) ~[httpcore-4.4.8.jar:4.4.8]
at org.apache.http.impl.conn.DefaultHttpResponseParser.parseHead(DefaultHttpResponseParser.java:138) ~[httpclient-4.5.3.jar:4.5.3]
at org.apache.http.impl.conn.DefaultHttpResponseParser.parseHead(DefaultHttpResponseParser.java:56) ~[httpclient-4.5.3.jar:4.5.3]
at org.apache.http.impl.io.AbstractMessageParser.parse(AbstractMessageParser.java:259) ~[httpcore-4.4.8.jar:4.4.8]
at org.apache.http.impl.DefaultBHttpClientConnection.receiveResponseHeader(DefaultBHttpClientConnection.java:163) ~[httpcore-4.4.8.jar:4.4.8]
at org.apache.http.impl.conn.CPoolProxy.receiveResponseHeader(CPoolProxy.java:165) ~[httpclient-4.5.3.jar:4.5.3]
at org.apache.http.protocol.HttpRequestExecutor.doReceiveResponse(HttpRequestExecutor.java:273) ~[httpcore-4.4.8.jar:4.4.8]
at org.apache.http.protocol.HttpRequestExecutor.execute(HttpRequestExecutor.java:125) ~[httpcore-4.4.8.jar:4.4.8]
at org.apache.http.impl.execchain.MainClientExec.execute(MainClientExec.java:272) ~[httpclient-4.5.3.jar:4.5.3]
at org.apache.http.impl.execchain.ProtocolExec.execute(ProtocolExec.java:185) ~[httpclient-4.5.3.jar:4.5.3]
at org.apache.http.impl.execchain.RetryExec.execute(RetryExec.java:89) ~[httpclient-4.5.3.jar:4.5.3]
at org.apache.http.impl.execchain.RedirectExec.execute(RedirectExec.java:111) ~[httpclient-4.5.3.jar:4.5.3]
at org.apache.http.impl.client.InternalHttpClient.doExecute(InternalHttpClient.java:185) ~[httpclient-4.5.3.jar:4.5.3]
at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:83) ~[httpclient-4.5.3.jar:4.5.3]
at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:56) ~[httpclient-4.5.3.jar:4.5.3]
at org.springframework.http.client.HttpComponentsClientHttpRequest.executeInternal(HttpComponentsClientHttpRequest.java:89) ~[spring-web-4.3.13.RELEASE.jar:4.3.13.RELEASE]
at org.springframework.http.client.AbstractBufferingClientHttpRequest.executeInternal(AbstractBufferingClientHttpRequest.java:48) ~[spring-web-4.3.13.RELEASE.jar:4.3.13.RELEASE]
at org.springframework.http.client.AbstractClientHttpRequest.execute(AbstractClientHttpRequest.java:53) ~[spring-web-4.3.13.RELEASE.jar:4.3.13.RELEASE]
at org.springframework.web.client.RestTemplate.doExecute(RestTemplate.java:659) ~[spring-web-4.3.13.RELEASE.jar:4.3.13.RELEASE]

如果客户端没有快速连续执行,则没有错误.

调试/分析

>分析了Wireshark捕获.服务器正在发送RST数据包
>没有关闭PoolingHttpClientConnectionManager和CloseableHttpClient？为正常关闭添加了@PreDestroy关闭方法.没运气.
>港口用尽？仅配置了200个同时连接.

Spring RestTemplate配置

@Configuration
public class Config {

private static final int CONNECT_TIMEOUT = 5000;

private static final int CONNECTION_MANAGER_CONNECTION_REQUEST_TIMEOUT = 0;

private static final int SOCKET_TIMEOUT = 5000;

private static final int MAX_TOTAL = 200;

private static final int MAX_PER_ROUTE = 200;


@Bean
public PoolingHttpClientConnectionManager poolingHttpClientConnectionManager() {
    PoolingHttpClientConnectionManager connectionManager = new PoolingHttpClientConnectionManager();
    connectionManager.setMaxTotal(MAX_TOTAL);
    connectionManager.setDefaultMaxPerRoute(MAX_PER_ROUTE);
    connectionManager.setValidateAfterInactivity(CONNECT_TIMEOUT);
    return connectionManager;
}

@Bean
public RequestConfig requestConfig() {
    RequestConfig result = RequestConfig.custom()
            .setConnectionRequestTimeout(CONNECTION_MANAGER_CONNECTION_REQUEST_TIMEOUT)
            .setConnectTimeout(CONNECT_TIMEOUT)
            .setSocketTimeout(SOCKET_TIMEOUT)
            .build();
    return result;
}

@Bean
public CloseableHttpClient httpClient(PoolingHttpClientConnectionManager poolingHttpClientConnectionManager, RequestConfig requestConfig) {
    CloseableHttpClient result = HttpClientBuilder
            .create()
            .setConnectionManager(poolingHttpClientConnectionManager)
            .setDefaultRequestConfig(requestConfig)
            .build();
    return result;
}

@Bean
public RestTemplate restTemplate() {
    HttpComponentsClientHttpRequestFactory factory = new HttpComponentsClientHttpRequestFactory();
    factory.setHttpClient(httpClient(poolingHttpClientConnectionManager(), requestConfig()));

    RestTemplate restTemplate = new RestTemplate();
    restTemplate.setRequestFactory(factory);
    return restTemplate;
}

}

天真的客户端程序：

public void invokeServer(long sleepTime, int concurrentThreads) {

    Site site = new Site();
    site.setMerchantId("MERC");
    site.setSiteId("SITE 100");
    CreateSiteRequest request = new CreateSiteRequest();
    request.setSite(site);
    request.setSleepTime(sleepTime);

    ResponseEntity<Site> response = null;
    if (concurrentThreads > 1) {

        ExecutorService executor = Executors.newFixedThreadPool(concurrentThreads);
        Future<ResponseEntity<Site>>[] futures = new Future[concurrentThreads];
        Callable<ResponseEntity<Site>> callable;

        for (int i = 1; i <= concurrentThreads; i++) {

            callable = () -> restTemplate.postForEntity(SAMPLE_SERVER_URL + "site", request, Site.class);

            futures[i - 1] = executor.submit(callable);
        }

        for (int i = 0; i < futures.length; i++) {
            try {
                response = futures[i].get();
            } catch (Exception e) {
                log.error("Thread " + i + " " + e.getMessage(), e);
            }
        }
    }
}

@PreDestroy
private void shutdown() throws IOException {
    client.close();
    connectionManager.close();
}

感谢任何输入.谢谢.