Hi Mark, Thank you for the response. Getting back on Query 3 and 4.
>>> There are no active streams and still connection is not being closed by >>> tomcat , and after sometime for new requests tomcat is sending RST. How long does new connection have to wait when connection limit reached , when TCP closed it with RST for such waiting connections ? >>> As it is a production issue, it's hard for us to reproduce this at our end >>> and retest. Thanks and Regards Arshiya Shariff -----Original Message----- From: Mark Thomas <ma...@apache.org> Sent: Wednesday, May 20, 2020 1:00 PM To: users@tomcat.apache.org Subject: Re: RST on TCP level sent by Tomcat On 20/05/2020 07:02, Arshiya Shariff wrote: > Hi Team , > > 1.We are facing a problem where tomcat is closing the http2 connections > silently without sending GOAWAY and FIN. Under what cases does this happen ? Tomcat always tries to write the GOAWAY frame. Network issues may prevent the client receiving it. > 2. What happens when maxkeepaliverequests reaches the configured limit, will > it close connections silently? Nothing. The limit does not exist in HTTP/2. > 3. What happens when max Connections is reached, will it close older > connections? No. New connections will have to wait until a connection is available. > 4. Currently we see keepalive timeout is default 20 seconds, but the > connection is not closed after that. For requests received after 3 hours > also we are sending response .Is there any way to close idle-connections ? Again, please upgrade and re-test. The keep-alive timeout only applies once the entire connection is idle - i.e. there are no currently processing streams. Mark > > Embedded Tomcat : 9.0.22 > > Thanks and Regards > Arshiya Shariff > > > -----Original Message----- > From: Arshiya Shariff > Sent: Monday, May 18, 2020 4:45 PM > To: Mark Thomas <ma...@apache.org>; users@tomcat.apache.org > Cc: M Venkata Pratap M <m.m.venkata.pra...@ericsson.com> > Subject: RE: RST on TCP level sent by Tomcat > > Hi Mark, > Thank you for the quick response. > > Please provide us a little more clarity on the 3rd query : > > 3. We see that RST is sent by tomcat on receiving http2 request, when does > this happen ? >>>> When things go wrong. E.g. when the client sends a request to a connection >>>> that has been closed. > > Why does tomcat not send GOAWAY on connection close, upon next request from > client it sends RST ? > > Also, Can you please send us the references to the timeout related fixes in > 9.0.35 (since 9.0.22). > > Thanks and Regards > Arshiya Shariff > > > > -----Original Message----- > From: Mark Thomas <ma...@apache.org> > Sent: Monday, May 18, 2020 4:17 PM > To: users@tomcat.apache.org > Subject: Re: RST on TCP level sent by Tomcat > > On 18/05/2020 11:01, Arshiya Shariff wrote: >> Hi Team, >> >> Can you please help us with the below queries : > > There have been various timeout related fixes since 9.0.22. Please upgrade to > 9.0.35 and re-test. > >> 1. When does a http2 connection close ? We see that the >> keepAliveTimeout is >> 20 seconds by default, but it is not closing the connection on >> keepAliveTimeout. > > Please re-test with 9.0.35. > >> 2. How to keep the connections alive / How to enable ping frames to >> be sent to the other end to keep the connection alive ? > > There is no standard API to send an HTTP/2 ping. If you want to keep the > connections alive for longer, use a longer keep-alive setting. > >> 3. We see that RST is sent by tomcat on receiving http2 request, when >> does this happen ? > > When things go wrong. E.g. when the client sends a request to a connection > that has been closed. > >> 4. What are the recommended ipv4.tcp settings for these kind of scenarios ? > > There are no recommended settings. > > Mark > > >> >> >> >> Embedded Tomcat : 9.0.22 >> >> Java Version : 1.8.0.201 >> >> Hardware : Red Hat Enterprise Linux Server release >> 7.4 >> >> >> >> Thanks and Regards >> >> Arshiya Shariff >> > > --------------------------------------------------------------------- > 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
