[jboss-jira] [JBoss JIRA] (JGRP-592) Pluggable policy for picking coordinator

[Bela Ban (JIRA)]

    [ https://issues.jboss.org/browse/JGRP-592?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12644668#comment-12644668 ] 

Bela Ban edited comment on JGRP-592 at 7/30/13 6:58 AM:
--------------------------------------------------------

[Comment from JGRP-1002]
When we have \{C, A, B\} and split into \{C,A\} and \{B\}, then a merge will produce \{A,B,C\}. Therefore the coord is moved from C to A. For certain apps, e.g. JBoss singletons, this is not good, as we're moving the singleton services from a perfectly healthy node to a different node.
GOAL: come up with a deterministic policy of picking a coord such that we minimize coord switching if the existing coord is still member of the cluster.
This depends on or is related to the flexible coord pick policy JIRA issue
                
      was (Author: belaban):
    [Comment from JGRP-1002]
When we have {C, A, B} and split into {C,A} and {B}, then a merge will produce {A,B,C}. Therefore the coord is moved from C to A. For certain apps, e.g. JBoss singletons, this is not good, as we're moving the singleton services from a perfectly healthy node to a different node.
GOAL: come up with a deterministic policy of picking a coord such that we minimize coord switching if the existing coord is still member of the cluster.
This depends on or is related to the flexible coord pick policy JIRA issue
                  
> Pluggable policy for picking coordinator
> ----------------------------------------
>
>                 Key: JGRP-592
>                 URL: https://issues.jboss.org/browse/JGRP-592
>             Project: JGroups
>          Issue Type: Feature Request
>            Reporter: Bela Ban
>            Assignee: Bela Ban
>            Priority: Minor
>             Fix For: 3.4
>
>
> Make policy to pick coordinator pluggable. Pick new coordinator after existing coordinator crashes by calling this policy.
> Default policy is to pick the next in line.
> Other policies could pick the next in line from a set of pinned coordinator, so certain members can never become coordinators.

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