[jboss-jira] [JBoss JIRA] (JGRP-2454) Documentation is wrong for ForkChannel creation / Initial messages on fork channel are lost

[Mirko Streckenbach (Jira)]

Mirko Streckenbach created JGRP-2454:
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             Summary: Documentation is wrong for ForkChannel creation / Initial messages on fork channel are lost
                 Key: JGRP-2454
                 URL: https://issues.redhat.com/browse/JGRP-2454
             Project: JGroups
          Issue Type: Bug
    Affects Versions: 4.1.8
            Reporter: Mirko Streckenbach
            Assignee: Bela Ban


The documentation at 

http://www.jgroups.org/manual/html/user-advanced.html#ForkChannelCreation

has the following example:
{code}
JChannel main_ch=new JChannel("/home/bela/udp.xml").name("A");
ForkChannel fork_ch=new ForkChannel(main_ch, "lock", "fork-ch4",
                                    new CENTRAL_LOCK(), new STATS());
fork_ch.connect("bla");
main_ch.connect("cluster");
{code}

This does not work as "fork_ch.connect" will throw an IllegalStateException because the main channel is not connected at that point.

But if the connects are reversed, messages for the fork channel may arrive before the fork channel is fully established and cause warnings like

{code}
Feb 20, 2020 6:15:37 PM org.jgroups.protocols.FORK$1 handleUnknownForkChannel
WARNING: marian-20309: fork-channel for id=fork-ch4 not found; discarding message
{code}

My application will send a message to every new member in the cluster on a specific fork channel (in  ReceiverAdapter.viewAccepted). These message usually get lost. Is there an alternate pattern for that?

I can provide example code if required.




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