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

[Bela Ban (JIRA)]

NAKACK: SET_DIGEST does not overwrite the digest
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                 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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