Hello, Is there anything I can do to help qualify the problem even more ?
Beyond having shown the source code of the servlet, would a fully mavenized example help? Anything else? Regards, -- Laurent On Fri, 2012-06-22 at 10:21 +0200, Laurent Petit wrote: > Hello, > > On Thu, 2012-06-21 at 22:53 +0200, Jeff MAURY wrote: > > Is it specific to Wordpad or any launched process will do the trick ? > > Do you tried with a non UI process (console) ? > > > I did an additional test, as you suggested, with a non UI process (a > small java executable launched in headless mode, whose purpose was just > to wait for 20 seconds before exiting). > > I can reproduce the problem with this headless executable: the HTTP > client is blocked until the 20 seconds elapse and the process is killed. > > > Here is the modified servlet code I used: > > https://www.refheap.com/paste/3285 > > > and here is the code for the small java program: > > https://www.refheap.com/paste/3286 > > > > Regards, > > -- > Laurent > > > > > > > Jeff > > > > On Thu, Jun 21, 2012 at 10:45 PM, Laurent Petit <lpe...@yseop.com> wrote: > > > > > En Réponse à "Tomcat Users List" <users@tomcat.apache.org> le 21 juin > > > 2012 00:07 Can you verify your 2 threads (reading input an error) are > > > launched ? Yes they are. Verified. Can you confirm you are getting the > > > problem only on Windows ? Yes sir, we're unable to reproduce it on Ubuntu. > > > Jeff On Wed, Jun 20, 2012 at 4:19 PM, Laurent Petit <lpe...@yseop.com> > > > wrote: > Hello, > > I have a problem with keep-alive connections, when > > > starting a subprocess > (via JDK's default ProcessBuilder/Process API), > > > while also having > started Tomcat with the APR HTTP/1.1 Connector. > > > > > The > > > problem symptom is with Keep-Alive connection, as follows: > > - the > > > client > > > (browser, jmeter, etc.) sends a first request > - the servlet starts a > > > Process for e.g. wordpad.exe > - the servlet returns an acknowledgment > > > html > > > content, sets the content > length, flushes the writer, and returns > - > > > the > > > client displays the received acknowledgement html content, sends > the > > > second request to the server. > - the server doesn't answer. No Tomcat log > > > ever reports the start of > something received. > - Then when on the > > > server > > > you close the wordpad.exe instance, the server > finally handles the > > > second > > > request. > > I have created a small servlet code which reproduces the > > > problem. > For the demo, it suffices to have the started subprocess be > > > > "wordpad.exe". Of course my real process is more interesting than > that > > > :-). > > You can find the servlet code for reproducing the test here: > > > > > https://www.refheap.com/paste/3254 > > > To reproduce the problem > > > deterministically, the ConnectionTimeout for > the APR HTTP Connector in > > > servlet.xml must be set sufficiently low. > With my boxes, I get a 100% > > > error hit when set at 200 ms. > > You can find here the jmeter script > > > which > > > hits the same page again and > again with "keep-alive" option set on: > > > > > https://www.refheap.com/paste/3255 > > > So far, the only reliable > > > solution we have found to work around this > problem is to not use the > > > HTP/1.1 APR Connector. > > > My configuration : > Windows 2008 US std R2 > > > 64bits > Tomcat 6.0.32 64 bits > Java 6u30 64 bits(Oracle) > > Same issue > > > has been observed on Windows 7 32 bits. > > Was not able to reproduce the > > > issue on Linux Ubuntu Desktop 11.10 or > 12.04. > > > Thanks for your > > > support, ideas, solutions, etc. > > > > > > > --------------------------------------------------------------------- > To > > > unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org > For additional > > > commands, e-mail: users-h...@tomcat.apache.org > > -- Jeff MAURY "Legacy > > > code" often differs from its suggested alternative by actually working and > > > scaling. - Bjarne Stroustrup http://www.jeffmaury.com > > > http://riadiscuss.jeffmaury.com http://www.twitter.com/jeffmaury > > > > > > > > > -- Laurent Petit Agence +33 (0)4 78 47 07 49 Email lpe...@yseop.com Yseop apporte une réponse intelligente et individualisée à chacun de vos clients www.yseop.com --------------------------------------------------------------------- To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
