Jetty访问静态资源Open Too Many Files
Jetty 9.0.3 Open too many files 问题1. Jetty9.0.3-20130506
2. 问题描述：
Linux Open too many files. 使用Jetty的DefaultServlet访问静态资源时，每次执行lsof –c java| grep pid 命令发现打开的静态的资源都没有被关闭。虽然通过修改ulimit –n设定了每个进程允许打开的最大文件描述符。但是如果jetty的访问的资源文件一直不被关闭，则上述方式无疑是饮鸠止渴。
3.问题解决：
通过跟踪Jetty9.0.3 DefaultServlet访问静态资源的方式，发现如果资源被资源缓存器缓存的话，则不会关闭该资源文件，只能等缓存的中的文件数量超过设置的最大文件数量（maxCachedFiles）或者缓存的文件总大小（maxCacheSize）超过设置的文件总大小，才会根据访问时间将缓存中的文件关闭。
conf/jetty/webdefault.xml
<servlet>
<servlet-name>default</servlet-name>
<servlet-class>org.eclipse.jetty.servlet.DefaultServlet</servlet-class>
<init-param>
<param-name>aliases</param-name>
<param-value>false</param-value>
</init-param>
<init-param>
<param-name>acceptRanges</param-name>
<param-value>true</param-value>
</init-param>
<init-param>
<param-name>dirAllowed</param-name>
<param-value>true</param-value>
</init-param>
<init-param>
<param-name>welcomeServlets</param-name>
<param-value>false</param-value>
</init-param>
<init-param>
<param-name>redirectWelcome</param-name>
<param-value>false</param-value>
</init-param>
<init-param>
<param-name>maxCacheSize</param-name>
<param-value>256000000</param-value>
</init-param>
<init-param>
<param-name>maxCachedFileSize</param-name>
<param-value>200000000</param-value>
</init-param>
<init-param>
<param-name>maxCachedFiles</param-name>
<param-value>-2</param-value>
</init-param>
<init-param>
<param-name>gzip</param-name>
<param-value>true</param-value>
</init-param>
<init-param>
<param-name>etags</param-name>
<param-value>true</param-value>
</init-param>
<init-param>
<param-name>useFileMappedBuffer</param-name>
<param-value>true</param-value>
</init-param>
<!--
<init-param>
<param-name>resourceCache</param-name>
<param-value>resourceCache</param-value>
</init-param>
-->
<!--
<init-param>
<param-name>cacheControl</param-name>
<param-value>max-age=3600,public</param-value>
</init-param>
-->
<load-on-startup>0</load-on-startup>
</servlet>
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