[jboss-jira] [JBoss JIRA] (JGRP-1897) ENCRYPT might drop messages during key change

[Bela Ban (JIRA)]

    [ https://issues.jboss.org/browse/JGRP-1897?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13016733#comment-13016733 ] 

Bela Ban commented on JGRP-1897:
--------------------------------

OK, you're right; this won't work unless {{ENCRYPT}} is under {{UNICAST}}. But the latter is not feasible as it only works with a shared keystore.
Can you create a pull request against master ?

> ENCRYPT might drop messages during key change
> ---------------------------------------------
>
>                 Key: JGRP-1897
>                 URL: https://issues.jboss.org/browse/JGRP-1897
>             Project: JGroups
>          Issue Type: Bug
>            Reporter: Tero Leppikangas
>            Assignee: Bela Ban
>             Fix For: 3.6.1
>
>
> ENCRYPT might drop some (unicast) messages encrypted with unknown key if the delivery of new view is delayed.
> This problem was noticed while doing some stress testing on the fix for JGRP-1893.
> When view changes, coordinator multicasts the new view after which is starts using new symmetric keys. If some node receives a message sent with the new key before the new view is received, the received message will be dropped since it cannot be decrypted.
> We thought of possible solutions to be.
> 1. Sender specific queue holding the messages received.
> 2. Starting to queue up messages until new view has been received
> I have implemented the second option which is quite straightforward, but it could lead into problems when receiving message with unknown key that is not related to coming view change.
> I wonder if there is another way to overcome this problem?



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