[jboss-jira] [JBoss JIRA] (JGRP-1901) GMS: view installation by consensus

[Bela Ban (JIRA)]

    [ https://issues.jboss.org/browse/JGRP-1901?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13018610#comment-13018610 ] 

Bela Ban commented on JGRP-1901:
--------------------------------

Yes. A node only installs committed views.

> GMS: view installation by consensus
> -----------------------------------
>
>                 Key: JGRP-1901
>                 URL: https://issues.jboss.org/browse/JGRP-1901
>             Project: JGroups
>          Issue Type: Feature Request
>            Reporter: Bela Ban
>            Assignee: Bela Ban
>             Fix For: 3.6.1
>
>
> Investigate whether view installation should optionally be done via 2PC. Example:
> * View is A,B,C,D, splits into A,B and C,D
> * Before AB is installed in A and B, view A,B,C is installed
> ** (C hasn't been suspected yet. This can happen with {{FD}})
> Infinispan's rebalancing algorithm has problems with this, as it tries to assign state to C which however isn't reachable from the A,B side of the network partition. It would be better if A,B,C,D went directly to A,B and C,D
> Investigate whether we should add a property to {{GMS}} which defines whether to use 2PC for view installation (default would be {{false}}). The algorithm would work as follows:
> * Send a {{PREPARE_VIEW(view)}} message
> * When all responses have been received -> send a {{COMMIT_VIEW}} message
> * Else
> ** Inject SUSPECT(C) event for all misisng acks OR
> ** Set a timer to go off in N ms -> when it fires, send the {{COMMIT_VIEW}} msg
> ** If another view is installed before the tmer goes off (e.g. A,B) -> kill the timer



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