[jboss-jira] [JBoss JIRA] Created: (JGRP-1090) Many retransmissions with message bundling and OOB messages

[Bela Ban (JIRA)]

Many retransmissions with message bundling and OOB messages
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                 Key: JGRP-1090
                 URL: https://jira.jboss.org/jira/browse/JGRP-1090
             Project: JGroups
          Issue Type: Task
            Reporter: Bela Ban
            Assignee: Bela Ban
             Fix For: 2.9


When message bundling is enabled, we queue *regular* messages until max_bundle_size has been reached or max_bundle_timeout has exceeded.

The problem is that - when sending OOB (as opposed to regular) messages - they're *not* queued. This means the OOB message is possibly received *before* the regular messages and thus causes retransmission !

E.g. we send regular message 1-10, then OOB message 11.

Say 1-3 are sent immediately (because the bundle timeout kicked in or the size was exceeded). Messages 4-10 are queued and sent later. Message 11 is sent immediately.

On the receiver side, message reception could be for example: 1-3, 11, 4-10

When OOB message 11 is received, the receiver asks for retransmission of messages 4-10 !

This is not incorrect, but causes a lot of unneeded retransmissions !



  public static void main(String[] args) throws Exception {
        JChannel c1=new JChannel("/home/bela/fast.xml");
        c1.connect("bla3");

        JChannel c2=new JChannel("/home/bela/fast.xml");
        c2.connect("bla3");

        for(int i=1; i <= 20; i++) {
            c1.send(null, null, "hello-" + i);
        }

        Message oob_msg=new Message(null, null, "oob msg");
        oob_msg.setFlag(Message.OOB);
        c1.send(oob_msg);

        Util.sleep(20000);
        Util.close(c2, c1);

    }


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