[infinispan-issues] [JBoss JIRA] (ISPN-4162) Can DIST use multicast when num_owners >= cluster size?

[Bela Ban (JIRA)]

    [ https://issues.jboss.org/browse/ISPN-4162?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12956695#comment-12956695 ] 

Bela Ban commented on ISPN-4162:
--------------------------------

Note that multicasts and unicasts are *independent wrt ordering*, e.g.
* The cluster is \{A,B,C,D,E\}
* A sends message M1 as multiple unicasts to B and C
* A sends message M2 as a multicast (to all)
* Unless both M1 and M2 are *synchronous*, the ordering of M1 and M2 on delivery is undefined. B might receive M1 and M2, whereas C might receive M2 and then M1.
                
> Can DIST use multicast when num_owners >= cluster size?
> -------------------------------------------------------
>
>                 Key: ISPN-4162
>                 URL: https://issues.jboss.org/browse/ISPN-4162
>             Project: Infinispan
>          Issue Type: Feature Request
>          Components: Core
>    Affects Versions: 7.0.0.Alpha1
>            Reporter: Paul Ferraro
>            Assignee: Dan Berindei
>
> It would be nice if DIST could conditionally use multicast instead of multiple unicasts when the number of owners to which to send a given command >= the size of the cluster.  In fact, we could probably come up with some configurable ratio of the size of the cluster (perhaps as high as 50%?), above which it is more optimal to use multicast vs multiple unicasts.  This would optimize the use of DIST in smaller, dynamic clusters.
> With such an optimization in place, REPL would be completely obsolete.

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