tomcat启动扫描导致启动过慢 原
tomcat在启动的时候每次到这个地方都要等待很长时间
2018-04-25 02:33:37,449 [main] INFO org.apache.catalina.core.StandardEngine- Starting Servlet Engine: Apache Tomcat/7.0.70
2018-04-25 02:33:37,449 [main] INFO org.apache.catalina.core.StandardEngine- Starting Servlet Engine: Apache Tomcat/7.0.70
2018-04-25 02:57:10,655 [localhost-startStop-1] INFO org.apache.catalina.startup.TldConfig- At least one JAR was scanned for TLDs yet contained no TLDs. Enable debug logging for this logger for a complete list of JARs that were scanned but no TLDs were found in them. Skipping unneeded JARs during scanning can improve startup time and JSP compilation time.
2018-04-25 02:57:10,655 [localhost-startStop-1] INFO org.apache.catalina.startup.TldConfig- At least one JAR was scanned for TLDs yet contained no TLDs. Enable debug logging for this logger for a complete list of JARs that were scanned but no TLDs were found in them. Skipping unneeded JARs during scanning can improve startup time and JSP compilation time.可以看到TLD scan居然花了24分钟之多 看了一圈资料 https://blog.csdn.net/renfufei/article/details/70878077 这玩意居然还会扫描两次 到底是什么原因导致的扫描如此的慢？ 开始排除外部因素，启动之前不再挂载mfs
/data/www/app/latest/WEB-INF/uploadsmfs的文件总量19GB左右，全量扫描一次如果在同一机房需要5-10分钟，如果不在同一机房，速度按理为指数级下降。 当不挂载mfs直接启动应用，应用启动在20s内就可以完成，也就是说tomcat启动很慢的原因是扫描了mfs目录引起的。 不过很遗憾，没有比较妥善的解决办法，tomcat7测试了各种跳过扫描的配置，没一个生效可用 目前有两个解决办法
- 延迟挂载mfs，让tomcat先启动
- mfs挂载目录放到WEB-INF之外
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