[jboss-jira] [JBoss JIRA] Resolved: (JGRP-1029) Discovery: return_entire_cache ends up with incorrect list of views

[Bela Ban (JIRA)]

     [ https://jira.jboss.org/jira/browse/JGRP-1029?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Bela Ban resolved JGRP-1029.
----------------------------

    Resolution: Done


Fixed by adding a return_views_only attr to PingHeader. When MERGE2 sends a discovery request, it sets this to true (default=false). Every receiver then only returns the current view and nothing else, even if return_entire_cache is set to true

> Discovery: return_entire_cache ends up with incorrect list of views
> -------------------------------------------------------------------
>
>                 Key: JGRP-1029
>                 URL: https://jira.jboss.org/jira/browse/JGRP-1029
>             Project: JGroups
>          Issue Type: Bug
>            Reporter: Bela Ban
>            Assignee: Bela Ban
>             Fix For: 2.8
>
>
> When return_entire_cache is set to true (default in TCPPING), then we can have the following scenario:
> - A, B and C
> - A's cache: 
>     - A: 123 / VA (View A)
>     - B: 456 / VA
>     - C: 777 / VA
> - B's cache:
>     - A: 123 / VB
>     - B: 456 / VB
>     - C: 777 / VB
> - C's cache:
>     - A: 123 / VC
>     - B: 456 / VC
>     - C: 777 / VC
> When we now have a discovery request, A, B and C return their entire cache. Depending on the order in which we receive the discovery responses, and the value of num_initial_rsps, the views can be inconsistent, e.g. if we get the following responses:
> - B: A: 123 / VB
> - C: B: 456 / VC
> - A: A: 123 / VA
> , then our views are A -> VB and B -> VC  ! A's 2nd discovery response is simply discarded, as we already have an entry for A !
> This leads to merges not happening

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