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I would also be very interested in finding out the answer for this..
We have an app that works AMAZING under pretty decent load but under
heavy load starts spitting out things such as internal server errors
(yes, i know this isn't enough to figure out the whole problem but
i am not bothering at this point because we had a misunderstanding
of DB Broker's way it made the pooling...)
ANYWAY, that problem seems to be solved but.. I have always wondered
about this section of the config..
Is this at all related literally to how many ppl can hit the servlet
engine at the same time.. (via ajp)? and if so do 51 and above wait
or get internal server errors?
-ed
>
> ----------------------------------------------------------------
> BEFORE YOU POST, search the faq at <http://java.apache.org/faq/>
> WHEN YOU POST, include all relevant version numbers, log files,
> and configuration files. Don't make us guess your problem!!!
> ----------------------------------------------------------------
>
>
> Well, my problem appears to be related to this. When I cranked up
> maxConnections, the problem goes away.
>
> # (this number does not identify the maximum number of concurrent servlet
> # requests: see the JServ protocol specification for more info on this)
>
> This is from the jserv.properties comments. What does this mean? I looked
> in the ApJServ docs and couldn't find anything relating to this. If I
> request 200 concurrent connections, don't I need
> security.maxConnections=200?
>
> Also, what's confusing me is that JServ *does* appear to be restarting. The
> logs show nothing (except Apache error_log shows "premature end of script
> headers", which I also find mysterious). All my servlets' init() methods
> are being called again after this.
>
> I think the solution to my problem is to crank up security.maxConnections;
> I'd like to understand what's happening.
>
> Thanks,
> Ben Flaumenhaft
>
> >JServ is serving up to maxConnections socket connections at the same
> >time (default 50)
> >JServ won't accept more that maxConnections, so Apahce will probably
> >'return internal server errors', but I are you sure that JServ
> >restarts itself ? please take a look at the logs.
> >
> > while (true) {
> > //Here we make sure that the number of
> > //parallel connections is limited
> > semaphore.throttle();
> > try {
> > JServConnection connection = new JServConnection();
> > Thread t = new Thread(connection);
> >
> >
> >Wednesday, January 19, 2000, 7:22:02 AM, you wrote:
> >
> >rle> ----------------------------------------------------------------
> >rle> BEFORE YOU POST, search the faq at <http://java.apache.org/faq/>
> >rle> WHEN YOU POST, include all relevant version numbers, log files,
> >rle> and configuration files. Don't make us guess your problem!!!
> >rle> ----------------------------------------------------------------
> >
> >
> >
> >rle> Ben,
> >rle> Can you also include the script you are using for the stress
> >testing ?
> >rle> I can try and run it on my machine and see what turns up.
> >
> >rle> best regards
> >
> >rle> Raghu
> >
> >rle> From:"B. Flaumenhaft" <[EMAIL PROTECTED]> on 01/18/2000 07:37 PM GMT
> >
> >rle> Sent by: "B. Flaumenhaft" <[EMAIL PROTECTED]>
> >
> >rle> Please respond to "Java Apache Users"
> >rle> <[EMAIL PROTECTED]>
> >
> >
> >rle> To: "Java Apache Users" <[EMAIL PROTECTED]>
> >rle> cc: (bcc: Raghu V Singh/rsingh1/LSU)
> >
> >rle> Subject: Re: Apache/JServ under high-volume requests?
> >
> >
> >
> >rle> ----------------------------------------------------------------
> >rle> BEFORE YOU POST, search the faq at <http://java.apache.org/faq/>
> >rle> WHEN YOU POST, include all relevant version numbers, log files,
> >rle> and configuration files. Don't make us guess your problem!!!
> >rle> ----------------------------------------------------------------
> >
> >
> >rle> Thanks for all the suggestions, but I'm afraid I've managed to duplicate
> >rle> the problem with an extremely basic servlet (no database access or
> >rle> potential resource issues).
> >
> >rle> I took the SimpleServlet program, included as an example in the JSDK.
> >This
> >rle> servlet simply opens an output stream and prints a "hello world"; I
> >added a
> >rle> small delay to it (Thread.sleep() for ten seconds). Several hundred
> >rle> connections kills Apache/JServ quite effectively.
> >
> >rle> I've attached this servlet code to the end of this message, in case
> >anyone
> >rle> would like to try it for themselves.
> >
> >rle> It certainly occurred to me that there might be bugs in my code (or in my
> >rle> VM). Still, to reiterate what noone has responded to: *** I'm not seeing
> >rle> deadlock, and I'm not seeing exceptions. I'm seeing JServ restart itself
> >rle> and Apache return internal server errors while this is happening. ***
> >
> >rle> Under what conditions should JServ die and restart? I was under the
> >rle> impression that it shouldn't be possible for my code to kill the VM.
> >
> >rle> I have a number of ideas as to what's happening here (most of them
> >rle> involving APJserv issues), but they're pure speculation, and I don't know
> >rle> the JServ internals very well. That's why I'm posting this here.
> >
> >rle> To reiterate: a very vanilla servlet is killing Apache/JServ under
> >rle> high-load conditions, and this is perfectly duplicable under Linux and
> >rle> Solaris (using several VMs, including the JavaSoft VM).
> >
> >rle> Thoughts?
> >
> >rle> Thanks,
> >rle> Ben Flaumenhaft
> >
> >
> >
> >rle> here's the code that's causing problems when requested by one or two
> >rle> hundred concurrent threads:
> >
> >rle> import java.io.*;
> >rle> import javax.servlet.*;
> >rle> import javax.servlet.http.*;
> >
> >rle> public class SimpleServlet extends HttpServlet
> >rle> {
> >rle> public void doGet ( HttpServletRequest request,
> >rle> HttpServletResponse response )
> >rle> throws ServletException, IOException
> >rle> {
> >rle> PrintWriter out;
> >rle> String title = "Simple Servlet Output";
> >
> >rle> // set content type and other response header fields
> >first
> >rle> response.setContentType("text/html");
> >
> >rle> // then write the data of the response
> >rle> out = response.getWriter();
> >
> >rle> out.println("<HTML><HEAD><TITLE>");
> >rle> out.println(title);
> >rle> out.println("</TITLE></HEAD><BODY>");
> >rle> out.println("<H1>" + title + "</H1>");
> >rle> out.println( "<p> Delaying 10 seconds ..." );
> >rle> out.flush();
> >
> >rle> try
> >rle> {
> >rle> Thread.sleep( 10 * 1000 );
> >rle> out.println( "done" );
> >rle> }
> >rle> catch( InterruptedException e )
> >rle> {
> >rle> out.println( "interrupted" );
> >rle> }
> >
> >rle> out.println("<P>This is output from SimpleServlet.");
> >rle> out.println("</BODY></HTML>");
> >rle> out.close();
> >rle> }
> >rle> }
> >
> >
> >rle> --
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> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >rle> --
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> >
> >
> >
> >
> >--
> >Best regards,
> > Ivan mailto:[EMAIL PROTECTED]
> >
> >
> >
> >
> >--
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