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tomcat接口调用时延开关

Star英 2022-03-30 阅读 45

项目中有些页面时延不稳定,需要看每次接口调用时延,怎么看,有两种方法:一种是直接去catalina.out日志中看,一种是直接去localhost_access_log日志中看,第一种需要在代码中实现时延的计算,第二种方法只需在server.xml中加一个简单的配置。这里只说第二种:

1、打开tomcat下conf/server.xml,先看Host节点配置:

    <!-- SingleSignOn valve, share authentication between web applications
         Documentation at: /docs/config/valve.html -->
    <!--
    <Valve className="org.apache.catalina.authenticator.SingleSignOn" />
    -->

    <!-- Access log processes all example.
         Documentation at: /docs/config/valve.html
         Note: The pattern used is equivalent to using pattern="common" -->
    <Valve className="org.apache.catalina.valves.AccessLogValve" directory="logs"
           prefix="localhost_access_log" suffix=".txt"
           pattern="%h %l %u %t &quot;%r&quot; %s %b" />

  </Host>

2、这时localhost_access_log最后一个字段是文件大小:

10.xx.xx.179 - - [12/Mar/2018:10:04:47 +0800] "POST /wlf.hello/getHelloWorld HTTP/1.1" 200 133

3、在conf/server.xml的Host节点中Value节点最后的pattern参数中添加% D

    <Valve className="org.apache.catalina.valves.AccessLogValve" directory="logs"
           prefix="localhost_access_log" suffix=".txt"
           pattern="%h %l %u %t &quot;%r&quot; %s %b %D" />

4、重新打开localhost_access_log,加上了时延大小,单位是毫秒:

10.xx.xx.179 - - [21/May/2021:14:12:22 +0800] “POST /wlf.hello/getHelloWorld HTTP/1.1” 200 2519 62
10.xx.xx.179 - - [21/May/2021:14:12:22 +0800] “POST /wlf.hello/getHelloWorld HTTP/1.1” 200 589 72
10.xx.xx.179 - - [21/May/2021:14:12:23 +0800] “POST /wlf.hello/getHelloWorld HTTP/1.1” 200 2096 47

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