Sorry Dumb question earlier - It is in Coyote jar. We are currently in a rollback state in our prod, but what you reported above sounds promising. If revert the Coyote jar resolves issues, which is the earliest/latest version we can revert to?
Thanks, MAnna On Tue, 19 Nov 2019 at 10:32, M. Manna <manme...@gmail.com> wrote: > Mark, > > On Mon, 18 Nov 2019 at 19:28, Mark Thomas <ma...@apache.org> wrote: > >> On 18/11/2019 14:14, Mark Thomas wrote: >> > On 18/11/2019 12:06, M. Manna wrote: >> >> Mark and others, >> >> >> >> On Mon, 18 Nov 2019 at 12:01, Mark Thomas <ma...@apache.org> wrote: >> >> >> >>> OK, it looks like I can reproduce this. >> >>> >> >>> Steps to reproduce: >> >>> >> >>> - Windows 2016 Server fully patched >> >>> - Java 1.8.0u144 >> >>> - Install Tomcat 8.5.45 from windows installer >> >>> - Add tcnative-1.dll (64-bit) from Tomcat Native 1.2.23 >> >>> - Modify server.xml to use Http11AprProtocol on port 8080 >> >>> - Make a single request >> >>> >> >>> I then see 1 core running at 100% until the connection times out after >> >>> 20s. Make another request and a core goes back up to 100% for 20s (the >> >>> default keep-alive time out). >> >>> >> >> >> >> I have also successfully reproduced this with making a single request >> >> (sorry for not replying in the weekend). Not sure how your graph looked >> >> like, but the Jvisualvm showed me a Sinusoidal modulation curve as >> soon as >> >> the request hit the server. and it didn't go down at all. >> > >> > I see similar behaviour on Windows 7 but the the CPU usage drops after >> ~5s. >> > >> > A binary search indicates that the issue was introduced with this >> commit: >> > >> > >> https://github.com/apache/tomcat/commit/fffb08790e642e03f00c5f96a3a61ee09a2c8342 >> > >> > (this is for 9.0.x - 8.5.x and 7.0.x had similar commits) >> > >> > However, that code was removed when APR was switched to a single poll >> > set. >> >> Ah ha. It was removed in 9.0.x but not in 8.5.x (only 9.0.x switched to >> a single Poller) so it does look like this change is responsible. >> >> Thanks for Debugging this. Are you saying that we will have a patch for > this? If so, which jar could we replace in 8.5.45 until > we move to new tomcat? > > Thanks, > > >> Mark >> >> --------------------------------------------------------------------- >> To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org >> For additional commands, e-mail: users-h...@tomcat.apache.org >> >>
