Hi Pil, Yes, this symptom occurs on daily basis, randomly few times per day.
I was told my client where they observed inaccessible table in the web page. The web page has the ability to sync (by sending HTTP request to the Servlet) with my application running on Tomcat for every interval of 20 seconds. If the web page does not updated periodically and exceeds to response limit, say 1 minutes, the expected result is inaccessible table in the web page. I only can track it through monitoring the network traffic and the log file written for every request processed by the Tomcat. Whenever a request from JSP page to the destination Servlet in the Tomcat Servlet container, I should see the logging of the activity. But right now I cannot see it unless the destination Servlet claimed to receive and respond to it. Thanks. Regads, hlchan. On Tue, Feb 23, 2010 at 11:06 PM, Pid <p...@pidster.com> wrote: > On 23/02/2010 14:19, Caldarale, Charles R wrote: >>> >>> From: Hae Loong Chan [mailto:haelo...@gmail.com] >>> Subject: Tomcat 5.5.26 stops responding to all client from >>> browser/applets for ~3minutes few times per day >>> >>> I generated 3 thread dumps during the period (by detecting that no >>> activity written to the log file and monitor the network activity) but >>> I could not identify the root cause from my application. >>> I could see the total number of threads are jumping from 210++ to >>> 310++, after that it fall back to 210++. Most of the threads are the >>> HTTP Processes. >> >> You need to examine /each/ thread carefully. (Rather laborious, but >> necessary.) It's likely that just one has locked something critical and >> caused everything else to back up behind it. The "lock" may not be a Java >> object, just something logically locked in your webapp. You may also have a >> situation where all the DB connections are tied up processing long-running >> queries or updates, again preventing all other threads from accessing the >> DB. >> >> It's remotely possible that everything is suspended for garbage >> collection, but given the duration of the delay, that seems unlikely. Turn >> on -verbose:gc to see if GC events correspond to the pauses. > > Does it occur at the same times every day, or at the same interval? > > (External DB backup perhaps?) > > > p > >> - Chuck >> >> >> THIS COMMUNICATION MAY CONTAIN CONFIDENTIAL AND/OR OTHERWISE PROPRIETARY >> MATERIAL and is thus for use only by the intended recipient. If you received >> this in error, please contact the sender and delete the e-mail and its >> attachments from all computers. >> >> >> --------------------------------------------------------------------- >> To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org >> For additional commands, e-mail: users-h...@tomcat.apache.org >> > > > --------------------------------------------------------------------- > To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org > For additional commands, e-mail: users-h...@tomcat.apache.org > > --------------------------------------------------------------------- To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
