[jboss-jira] [JBoss JIRA] (JGRP-1595) STABLE2

[Bela Ban (JIRA)]

Bela Ban created JGRP-1595:
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             Summary: STABLE2
                 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


The time computed for the sending of STABLE is desired_avg_gossip * cluster-size *2. While this is OK for small clusters, it may be too big for large clusters.
On the other hand, if every member simply multicasts a STABLE message every (say) 30 seconds on average, then the number of messages sent grows with increasing cluster size.
Investigate a way to set a lower and upper limit for the making and delivery of *STABILITY* messages, e.g. the goal is to receive 1 stability message every 60s.

Besides increased traffic, however, this requires everyone to have a TCP connection to everybody else in the cluster in case of a TCP transport.

A better solution might be to have only 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.

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