[jboss-jira] [JBoss JIRA] (JGRP-1354) Compress views

[Bela Ban (JIRA)]

    [ https://issues.jboss.org/browse/JGRP-1354?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12804443#comment-12804443 ] 

Bela Ban commented on JGRP-1354:
--------------------------------

Delta views can be turned off by setting GMS.use_delta_views to false. This can also be done at runtime:
probe.sh jmx=GMS.use_delta_views=false
                
> Compress views
> --------------
>
>                 Key: JGRP-1354
>                 URL: https://issues.jboss.org/browse/JGRP-1354
>             Project: JGroups
>          Issue Type: Enhancement
>            Reporter: Bela Ban
>            Assignee: Bela Ban
>             Fix For: 3.4
>
>
> In clusters with many members, a view can be large. Currently, when a new member joins, or an existing member leaves, the coordinator sends a view to all existing members and a JoinRsp to the new joiner(s).
> The view currently contains *all members*, and the serialized VIEW message can be large.
> The goal of this JIRA is therefore to reduce the size of the VIEW message sent to all members.
> This can be done by:
> * Sending the first view of a given coordinator as full view
> * Sending subsequent views only as diffs (delta views)
> ** A delta view contains a view-id (can possibly be omitted), which is the previous view, and an array of members which left and members which joined
> * When unmarshalling a delta-view, the receiver can create the new view as a copy of the old view, minus the left members, plus the joining members
> * When the coordinator changes, the new coordinator always sends its first view as full view
> * MergeViews are always sent as full views
> * It should be possible to turn this behavior off, so a coordinator will always send full views, and to change this at runtime.
> * The marshalling code needs to be able to handle both full- and delta- views.

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