[jboss-jira] [JBoss JIRA] (JGRP-1595) STABLE: send stable messages to coordinator only

[Bela Ban (JIRA)]

     [ https://issues.jboss.org/browse/JGRP-1595?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Bela Ban updated JGRP-1595:
---------------------------

    Summary: STABLE: send stable messages to coordinator only  (was: STABLE2)


Added flag send_stable_msg_to_coord_only, which (if true) sends STABLE messages to the coord only, instead of to all cluster members (reducing traffic)
                
> STABLE: send stable messages to coordinator only
> ------------------------------------------------
>
>                 Key: JGRP-1595
>                 URL: https://issues.jboss.org/browse/JGRP-1595
>             Project: JGroups
>          Issue Type: Feature Request
>            Reporter: Bela Ban
>            Assignee: Bela Ban
>             Fix For: 3.3
>
>
> While JGRP-1570 only changes the default for desired_avg_gossip and max_bytes (not scaling them with the cluster size), this issue is about a new stable protocol, STABLE2, which works well in large clusters without generating too much traffic.
> It works as follows:
> * A dedicated member (the coord) periodically multicast a STABLE message
> * Everyone replies with a (unicast) STABLE message and when the coord has received STABLE replies from everyone, it multicasts a STABILITY message
> * This would only require a multicast from the coord to everyone, establishing TCP connections from the coord to everyone (usually already exists because of the VIEW-CHANGE multicast), but everyone would reuse the same TCP connection to send the reply
> Another solution could be that every member sends its STABLE message to the current coordinator (triggered by time or size), and when the coordinator has received STABLE messages from all members, it multicasts  a STABILITY message

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