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http://nagoya.apache.org/bugzilla/show_bug.cgi?id=4361

SsiServlet potentially leaks files

           Summary: SsiServlet potentially leaks files
           Product: Tomcat 4
           Version: 4.0 Final
          Platform: Sun
        OS/Version: Linux
            Status: NEW
          Severity: Critical
          Priority: Other
         Component: Catalina
        AssignedTo: tomcat-dev@jakarta.apache.org
        ReportedBy: rami.hanninen@davisor.com


SsiServlet does not seem to close some of the streams it uses. The symptoms this
causes are that the whole server starts to suffer from 'Too many open files'
errors like this:

2001-10-23 12:00:16 ApplicationDispatcher[/archive] Servlet.service() for
servlet default threw exception
java.io.FileNotFoundException: /home/ibs/archive/tk/tyyli_yleinen_ibs.ssi (Too
many open files)
	at java.io.FileInputStream.open(Native Method)
	at java.io.FileInputStream.<init>(FileInputStream.java:64)
	at java.io.FileInputStream.<init>(FileInputStream.java:95)
	at
org.apache.naming.resources.FileDirContext$FileResource.streamContent(FileDirContext.java)
	at
org.apache.catalina.servlets.DefaultServlet$ResourceInfo.getStream(DefaultServlet.java)
	at org.apache.catalina.servlets.DefaultServlet.copy(DefaultServlet.java)
	at
org.apache.catalina.servlets.DefaultServlet.serveResource(DefaultServlet.java)
	at org.apache.catalina.servlets.DefaultServlet.doGet(DefaultServlet.java)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java)
	at
org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java)
	at
org.apache.catalina.core.ApplicationDispatcher.doInclude(ApplicationDispatcher.java)
	at
org.apache.catalina.core.ApplicationDispatcher.include(ApplicationDispatcher.java)
	at org.apache.catalina.util.ssi.SsiInclude.getStream(Unknown Source)
	at org.apache.catalina.servlets.SsiInvokerServlet.requestHandler(Unknown
Source)
	at org.apache.catalina.servlets.SsiInvokerServlet.doGet(Unknown Source)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java)
	at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java)
	at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java)
	at
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java)
	at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java)
	at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java)
	at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java)
	at
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java)
	at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java)
	at org.apache.catalina.valves.CertificatesValve.invoke(CertificatesValve.java)
	at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java)
	at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java)
	at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java)
	at org.apache.catalina.core.StandardContext.invoke(StandardContext.java)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java)
	at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java)
	at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java)
	at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java)
	at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java)
	at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java)
	at
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java)
	at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java)
	at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java)
	at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java)
	at org.apache.catalina.connector.http.HttpProcessor.process(HttpProcessor.java)
	at org.apache.catalina.connector.http.HttpProcessor.run(HttpProcessor.java)
	at java.lang.Thread.run(Thread.java:484)

Although this error message alone does not prove that SSI is the guilty party,
the errors started to appear immediately after SSI servlet was taken into use.
In particular, I tested the system with a lengthly data import operation that
accesses thousands of HTML documents, and it works fine when SSI is disabled,
but corrupts the server with the "Too many open files" problems when SSI is
enabled.

SSI implementation seems therefore to have at least some role in causing this
trouble.