[jboss-jira] [JBoss JIRA] (JGRP-1830) SEQUENCER2: handle coord failover

[Bela Ban (JIRA)]

    [ https://issues.jboss.org/browse/JGRP-1830?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13158919#comment-13158919 ] 

Bela Ban commented on JGRP-1830:
--------------------------------

To deliver a non-monotonic order, e.g. 3, 5, 6 (delivered as 6, 5, 3), we could send the previous seqno with the current seqno, e.g.
{noformat}
6(5) -> 5(3) -> 3(2)
{noformat}
Say the current seqno is 2:
* Reception of 6(5). We queue 6 as we cannot deliver it since we haven't received 5 yet
* Reception of 5(3). We queue 5 as we haven't received 3 yet
* Reception of 3(2). We deliver 3 as it's the next seqno to the current seqno 2
* We deliver 5 as it's the next seqno to 3 (note that we won't get a 4)
* We deliver 6 as well, as it's the next seqno to 5

This simple mechanism allows us to deliver non-monotonically increasing seqnos. Having the ability to do so simplifies the implementation of coord failover.

> SEQUENCER2: handle coord failover
> ---------------------------------
>
>                 Key: JGRP-1830
>                 URL: https://issues.jboss.org/browse/JGRP-1830
>             Project: JGroups
>          Issue Type: Feature Request
>            Reporter: Bela Ban
>            Assignee: Bela Ban
>             Fix For: 4.1
>
>
> Continuation of JGRP-1821; handle failure cases



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