On 22/05/2020 07:39, Arshiya Shariff wrote: > Hi Mark , > > 1.Currently we have configured max http2 threads as 40 , but tomcat is > allowing more than 300 connections , is there a way to check how many http2 > connections tomcat will allow ? > > 2. Is maxThreads the maxConnections Or is there any other way to set max > connections ? > We are setting properties by extending the Connector.java class.
These are explained in the documentation: http://tomcat.apache.org/tomcat-9.0-doc/config/http.html#Standard_Implementation http://tomcat.apache.org/tomcat-9.0-doc/config/http2.html#Common_Attributes Mark > > Embedded Tomcat : 9.0.22 > > Thanks and Regards > Arshiya Shariff > > -----Original Message----- > From: Mark Thomas <ma...@apache.org> > Sent: Wednesday, May 20, 2020 3:42 PM > To: users@tomcat.apache.org > Subject: Re: RST on TCP level sent by Tomcat > > > > On 20/05/2020 10:07, Arshiya Shariff wrote: >> 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. >>>>> As it is a production issue, it's hard for us to reproduce this at our >>>>> end and retest. >> >> 1.How long does new connection have to wait when connection limit reached >> , when TCP closed it with RST for such waiting connections ? > > That will depend on the client's connection timeout. Tomcat has no control > over that. > >> 2.What is the idle timeout in 9.0.22 for http2 if not provided , will there >> be issues if it is infinite also ? > > Again. You need to upgrade. There issues with HTTP/2 timeouts in that version. > > Mark > > >> >> >> 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 >> >> >> --------------------------------------------------------------------- >> 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 > --------------------------------------------------------------------- To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
