Hi all, What about picking any of both value as default and if value is not explicit (we can use Integer and if null we default on 6 or 8 whatever you prefer) then we log like 5 lines of text writing more or less what is in the doc and saying to the user a default was set but he must set what fits his app and explicitly configure it. Don't think we can find the good default for this trade off (between perf and reliability) for prod but we should stay working OOTB in dev and "first" env (like functional, dev, test ones) IMHO.
Romain Manni-Bucau @rmannibucau <https://twitter.com/rmannibucau> | Blog <https://rmannibucau.metawerx.net/> | Old Blog <http://rmannibucau.wordpress.com> | Github <https://github.com/rmannibucau> | LinkedIn <https://www.linkedin.com/in/rmannibucau> | Book <https://www.packtpub.com/application-development/java-ee-8-high-performance> Le mer. 6 janv. 2021 à 15:37, Christopher Schultz < ch...@christopherschultz.net> a écrit : > Rémy and Jean-Frederic, > > On 1/6/21 06:20, Rémy Maucherat wrote: > > On Wed, Jan 6, 2021 at 11:58 AM jean-frederic clere <jfcl...@gmail.com> > > wrote: > > > >> Hi, > >> > >> While testing the tomcat clustering I have noted that at the start from > >> time to the attribute replication is failing. > >> While debugging I have the messages: > >> +++ > >> 05-Jan-2021 10:25:07.046 FINE [Tribes-Task-Receiver[Catalina-Channel]-6] > >> org.apache.catalina.ha.session.DeltaManager.handleSESSION_DELTA Manager > >> [localhost#/demo-1.0]: received session delta for unknown session > >> [596AEB7A68DE2D8F6B9819D4F4F55CDA] > >> 05-Jan-2021 10:25:07.045 FINE [Tribes-Task-Receiver[Catalina-Channel]-5] > >> org.apache.catalina.ha.session.DeltaManager.messageReceived Manager > >> [localhost#/demo-1.0]: Received SessionMessage of > >> type=[SESSION-MODIFIED] from > >> [org.apache.catalina.tribes.membership.MemberImpl[tcp://{10, 128, 2, > >> 182}:4000,{10, 128, 2, 182},4000, alive=10037, securePort=-1, UDP > >> Port=-1, id={-87 87 4 -12 89 -46 96 94 12 20 -103 -109 -56 120 -16 74 }, > >> payload={}, command={}, domain={}]] > >> 05-Jan-2021 10:25:07.046 FINE [Tribes-Task-Receiver[Catalina-Channel]-5] > >> org.apache.catalina.ha.session.DeltaManager.handleSESSION_CREATED > >> Manager [localhost#/demo-1.0]: received session created message for > >> session [596AEB7A68DE2D8F6B9819D4F4F55CDA] > >> > >> +++ > >> It looks like the delta is processed before the session creation and it > >> is ignored. > >> > >> When using the channelSendOptions="6" I am NOT getting the "received > >> session delta for unknown session" and the stuff is working perfectly. > >> > >> Should we change the default for channelSendOptions to 6? - the actual > >> value is 8 - > >> > > > > The documentation for the values is here: > > > http://tomcat.apache.org/tomcat-10.0-doc/config/cluster.html#SimpleTcpCluster_Attributes > > > > So the default is the fastest, but if it's not reliable for many > reasonable > > use cases it may not be a good idea. > > I would always recommend the most stable and reliable defaults for any > system. If an admin wants to relax those defaults to e.g. get better > performance with some trade-offs, at least they make that change > (theoretically) with the knowledge of those trade-offs. > > At some point, I think we should enable strict servlet compliance by > default with a forthcoming major release like 10.1 or whatever. > > -chris > > --------------------------------------------------------------------- > To unsubscribe, e-mail: dev-unsubscr...@tomcat.apache.org > For additional commands, e-mail: dev-h...@tomcat.apache.org > >
