[jboss-jira] [JBoss JIRA] Commented: (JGRP-700) FLUSH: flushing should span merge

Tue Jun 3 18:23:20 EDT 2008

    [ http://jira.jboss.com/jira/browse/JGRP-700?page=comments#action_12415482 ] 

Vladimir Blagojevic commented on JGRP-700:
------------------------------------------

Ported on 2.6. The change set is the same!

> FLUSH: flushing should span merge
> ---------------------------------
>
>                 Key: JGRP-700
>                 URL: http://jira.jboss.com/jira/browse/JGRP-700
>             Project: JGroups
>          Issue Type: Task
>            Reporter: Bela Ban
>         Assigned To: Vladimir Blagojevic
>             Fix For: 2.7, 2.6.3
>
>
> When we run flush during a merge (say between {A,B} and {C,D}), then the flush protocol is run only when installing the new merge view {A,B,C,D} in both subgroups *individually*, e.g. flush is run for {A,B} and for {C,D}. If the flush in {C,D} completes sooner than the one in {A,B}, C and D will be able to send messages during {A,B}'s flush phase, thus violating the properties of flush.
> The change should be as follows:
> - A merge between the 2 subgroups is detected
> - If flush is enabled, run the flush protocol in {A,B} and {C,D}, *before* the new view V2={A,B,C,D} is installed
> - Install V2
> - When the view installation is complete, ie. A and C have acked it, only *then* complete the flush and allow members to resume message sending

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