Hi, For the channelStartOptions attribute of SimpleTcpCluster, the Tomcat 8.5 documentation notes, "To start a channel without multicasting, you would want to use the value Channel.SND_RX_SEQ | Channel.SND_TX_SEQ that equals to 3."
However, according to 9.0 and later documentation, "When using the static membership service org.apache.catalina.tribes.membership.StaticMembershipService you must ensure that this attribute is configured to use the default value." I had originally asked this question on the user mailing list https://marc.info/?l=tomcat-user&m=170241211113364&w=2 which ch...@christopherschultz.net was kind to answer. Option 15 (the default) includes option 3. I know this sounds trivial when spelled-out, however, as a new Tomcat user, the explanation was really helpful. Therefore, I would like to propose that the documentation for 9.0 and later versions be elaborated to, "When using the static membership service org.apache.catalina.tribes.membership.StaticMembershipService (or the static membership interceptor org.apache.catalina.tribes.group.interceptor.StaticMembershipInterceptor) you must ensure that this attribute is configured to include the value Channel.SND_RX_SEQ | Channel.SND_TX_SEQ = 3 which the default value (15) does. This is because static membership exclusively uses unicast." I know this is more verbose than the previous versions, but imo it's much clearer. If this is fine, I would like to raise a PR on GitHub for the change. Sincerely, Manak Bisht
