[jboss-jira] [JBoss JIRA] Resolved: (JGRP-1014) NAKACK: SET_DIGEST does not overwrite the digest

[Bela Ban (JIRA)]

     [ https://jira.jboss.org/jira/browse/JGRP-1014?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Bela Ban resolved JGRP-1014.
----------------------------

    Resolution: Done


> NAKACK: SET_DIGEST does not overwrite the digest
> ------------------------------------------------
>
>                 Key: JGRP-1014
>                 URL: https://jira.jboss.org/jira/browse/JGRP-1014
>             Project: JGroups
>          Issue Type: Bug
>            Reporter: Bela Ban
>            Assignee: Bela Ban
>             Fix For: 2.8
>
>
> When we set a digest in NAKACK, we do not overwrite an element for a member if it already exists. With state transfer, the following issue can occur (see [1]):
> Scenario #2:
> - [NAKACK] D receives B:11 (digest is 11 now for B)
> - [NAKACK] D applies the digest: this does NOT reset the digest for B to #10, but it remains #11 !!
> - D delivers B:11 to the app, changes state
> - D sets state, overwriting the change from B:11
> --> B:11 will NOT get retransmitted as the digest in NAKACK contains it !
> --> B:11 is lost
> SOLUTION: maybe add a 'state' boolean to the setDigest() method and overwrite if true
> This is a regression in 2.8 only; 2.6.x and 2.4.x handle SET_DIGEST correctly and do overwrite the digest.
> [1] https://jira.jboss.org/jira/browse/JGRP-1013

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