[jboss-jira] [JBoss JIRA] Commented: (JGRP-1192) RpcDispatcher / MessageDispatcher: add exclusion list to compute target membership

[Bela Ban (JIRA)]

    [ https://jira.jboss.org/jira/browse/JGRP-1192?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12526371#action_12526371 ] 

Bela Ban commented on JGRP-1192:
--------------------------------

An exclusion list is very good for the case when we need to execute a call on all members but 1 or 2. This way, we only need to send an exclusion list containing a few members.

The default case (execute on all members) would contain a null *inclusion* list.

Depending on the target set, we can send an inclusion or exclusion list, whichever is smaller !

> RpcDispatcher / MessageDispatcher: add exclusion list to compute target membership
> ----------------------------------------------------------------------------------
>
>                 Key: JGRP-1192
>                 URL: https://jira.jboss.org/jira/browse/JGRP-1192
>             Project: JGroups
>          Issue Type: Feature Request
>            Reporter: Bela Ban
>            Assignee: Bela Ban
>             Fix For: 2.10
>
>
> [Email Paul Ferraro]
> Always send an address list PLUS a bit flag that indicates how to
> interpret the list.  If the flag is 0, interpret the list as a target
> list.  If the flag is 1, interpret the list as an exclusion list.
> When a target list is specified for an rpc, compare the size of the
> membership list with the target list.  If (target * 2) <= membership,
> send list with exclusion flag = 0.  If (target * 2) > membership, send
> set difference between membership and target list with exclusion flag =
> 1.  On the receiving end, if exclusion flag is 0, handle the message if
> we're in the list of addresses; if exclusion flag is 1, handle the
> message if we're NOT in the list of addresses.
> A rpc with a null target list would always use a exclusion flag of 1,
> exclude nothing.
> Even better, add new RpcDispatcher/MessageDispatcher methods to invoke
> on all except a list of addresses.  This way, jgroups doesn't need to do
> anything "clever" - but always send list + bit flag in accordance with
> API.

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