当我有accept-count=100000时，为什么我会得到SocketTimeoutException？

Question

server.tomcat.accept-count=100000
server.tomcat.max-threads=1000

public static void main(String[] args) {
    ApplicationContext context = SpringApplication.run(Application.class, args);
    ServerProperties serverProperties = context.getBean(org.springframework.boot.autoconfigure.web.ServerProperties.class);
    Tomcat tomcat = serverProperties.getTomcat();
    Logger.getLogger(Application.class.getName()).info("acceptCount = " + tomcat.getAcceptCount());
    Logger.getLogger(Application.class.getName()).info("maxConnections = " + tomcat.getMaxConnections());
    Logger.getLogger(Application.class.getName()).info("maxThreads = " + tomcat.getMaxThreads());

2019-10-24 20:22:31.174  INFO 57472 --- [  restartedMain] c.s.s.Application : acceptCount = 100000
2019-10-24 20:22:31.174  INFO 57472 --- [  restartedMain] c.s.s.Application : maxConnections = 10000
2019-10-24 20:22:31.175  INFO 57472 --- [  restartedMain] c.s.s.Application : maxThreads = 1000

    <elementProp name="ThreadGroup.main_controller" elementType="LoopController" guiclass="LoopControlPanel" testclass="LoopController" testname="Loop Controller" enabled="true">
      <boolProp name="LoopController.continue_forever">false</boolProp>
      <stringProp name="LoopController.loops">100</stringProp>
    </elementProp>
    <stringProp name="ThreadGroup.num_threads">10000</stringProp>
    <stringProp name="ThreadGroup.ramp_time">10</stringProp>

Response code: Non HTTP response code: java.net.SocketTimeoutException
Response message: Non HTTP response message: Read timed out

我还尝试了accept-count=10000，max-connections=1000，JMeter获得了多达8000个示例，最大时间12000ms(HTTP请求超时30s)，并给出了错误响应代码：非HTTP响应代码:org.apache.HTTP.conn.HTTPhostConnectException响应消息：非HTTP响应消息：连接到本地主机:8080[localhost/127.0.0.1,localhost/0:0:0:0:0:0:0:1]失败：连接拒绝：连接。在拒绝之前，它至少应该排队10,000个连接。

Answer 1

根据Tomcat文档

MaxConnections

服务器在任何给定时间将接受和处理的最大连接数。当达到这个数字时，服务器将接受但不处理另一个连接。在处理的连接数低于maxConnections之前，将阻止此附加连接，此时服务器将再次开始接受和处理新连接。请注意，一旦达到限制，操作系统仍然可以根据acceptCount设置接受连接。默认值因连接器类型而异。对于NIO和NIO2，默认值是10000。对于apr/native，默认值为8192。