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Ayub, On 6/22/20 05:41, Ayub Khan wrote: > I am using HikariCP for connection pooling. If the database is > leaking connections then I should see connection not available > exception. That probably depends upon your connection pool configuration. It's definitely possible to configure a connection pool to leak connections without complaint. > How do I find out which file descriptors are leaking ? these are > not files open on disk as there is no explicit disk file I/O in > this application. You might have to use a profiler. > I just use the below command to check for open file descriptors: > > watch "sudo ls /proc/`cat /var/run/tomcat8.pid`/fd/ | wc -l" Felix's suggestions for how to check the types of file handles are good. You should be able to get host:port information from the sockets you are seeing and, I suspect, you'll find that they all point to your database. - -chris > On Sun, Jun 21, 2020 at 8:18 PM Christopher Schultz < > ch...@christopherschultz.net> wrote: > > Ayub, > > On 6/20/20 11:51, Ayub Khan wrote: >>>> Sorry we are using 8.0.32 version of tomcat. >>>> >>>> below is the configuration: >>>> >>>> Server version: Apache Tomcat/8.0.32 (Ubuntu) Server built: >>>> Jan 24 2020 16:24:30 UTC Server number: 8.0.32.0 OS Name: >>>> Linux OS Version: 4.4.0-1087-aws Architecture: amd64 >>>> JVM Version: 1.8.0_181-b13 JVM Vendor: Oracle >>>> Corporation >>>> >>>> I use the below command to check the file descriptors: >>>> >>>> watch "sudo ls /proc/`cat /var/run/tomcat8.pid`/fd/ | wc -l" > > So you know there is some kind of increase in file-handle use, but > you don't know what types of file handles are increasing, right? > > Can you try to find out which kinds of file handles are > increasing? > > I have a sneaking suspicion that it's your database connections > and not actually files open on the disk. > > Are you using a database connection pool? If not, you should > really use one and limit the number of connections to something > sane. If you are using one, are you monitoring it to see how many > connections are actually being used? Are you sure you are using > proper resource management[1]? Even a single code-path that leaks > connections can leak them quickly under load. > >>>> When there an issue related to broken files, this value >>>> keeps increasing, the only way to bring it down is to remove >>>> vm instance from AWS load balancer.> Which version of tomcat >>>> should I install ? > > Tomcat 8.0.x hasn't been supported since its last release on 29 > June 2018. That was 8.0.53. Your release is from 8 February 2016 > and is dangerously out of date (unless you are using the > Ubuntu-packaged version, in which case I hope they kept-up with > security patches thee past 4 years). > > -chris > >>>> On Sat, Jun 20, 2020 at 6:28 PM Christopher Schultz < >>>> ch...@christopherschultz.net> wrote: >>>> >>>> Ayub, >>>> >>>> On 6/19/20 16:46, Ayub Khan wrote: >>>>>>> tomcat 8.5 broken pipe increases open files on ubuntu >>>>>>> AWS >>>> >>>> Which exact version of Tomcat 8.5? If you aren't running the >>>> latest version (8.5.56), please upgrade and re-test. >>>> >>>>>>> If there is slow response from db I see this stack >>>>>>> trace and the open files goes high and the only way to >>>>>>> open files go down is to remove the instance from >>>>>>> Amazon load balancer. >>>>>>> >>>>>>> Is there a way to keep the open files low even when >>>>>>> Broken pipe error is thrown ? >>>> >>>> What is your evidence that file handles are being left open? >>>> >>>> Which file handles are being left open? >>>> >>>> -chris >>>>> >>>>> ------------------------------------------------------------------ - --- >>>>> >>>>> > >>>>> 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 >> >> > -----BEGIN PGP SIGNATURE----- Comment: Using GnuPG with Thunderbird - https://www.enigmail.net/ iQIzBAEBCAAdFiEEMmKgYcQvxMe7tcJcHPApP6U8pFgFAl7w0U0ACgkQHPApP6U8 pFgnCw/9GxKtFIdNS71zYPAYgEY0O6bh4+SyvD7cWsNRwAEtN4jwwmvmbk+9ldGa 5u8jalMeWjBaYtVev+T7XQ0EOJN9ZuunyXHzKR8LeIqPCzka/34inQKBhlwOFyR+ lQUhod8VsDrQJ4lb2ZxC1yS/mnUFdKeV2u2Px9mIr5WdkfVAxYWCOuKTW9DrW3HE nbPG5t3oiLS8Rx+xXssyaTii5DAaQm0X0FYkkPp1GQ8Tj0/fylsE17nV8LrxLTb5 qhv0l6avR2/IsXaD6DC8MjdUO6kz5hkWNLtO/WcKrIFI+xPcYs2+Hog7Hrajetwp QR8f7R7ry0W0HLy3p3R10jMwDQzOWjn2RNxQqL2qfNGmOqMbTi2XskQhtkKPoM9Y LqZJsG0Ax2kNr6N4YeYpotRVcGqCJDgLwQ3HMjkHW/Y1M4O2NicphW9iFd5L+X9Z fh4KFz5XbAUM4py7IuMtj1SH/FrOMyfBtKl6ECJ98VbtoBPU0I6Kmc0lgbf3h9wD yphZ+3pW6a9Oeroq7aRTd35XdFqLdi9eg4Ze19/KpAr0hw3pgPvQqZiqq5qhpOrv HhNWfHhvzeXmmab0DeLB9On+FDp30svWv9hmAR1ZB8ViBeCDoFjaUxv1UltqS6NQ m9UsvtNR3035EpiSw9p5Jh5+eiG6swSnJXQH4yZxkVNAsHthyBA= =KsIE -----END PGP SIGNATURE----- --------------------------------------------------------------------- To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
