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https://issues.apache.org/jira/browse/IGNITE-5836?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Evgenii Zhuravlev reassigned IGNITE-5836:
-----------------------------------------
Assignee: Evgenii Zhuravlev
> AffinityFunctionContext should provide consistent previous assignment
> ---------------------------------------------------------------------
>
> Key: IGNITE-5836
> URL: https://issues.apache.org/jira/browse/IGNITE-5836
> Project: Ignite
> Issue Type: Bug
> Components: cache
> Affects Versions: 2.0
> Reporter: Valentin Kulichenko
> Assignee: Evgenii Zhuravlev
> Priority: Critical
> Fix For: 2.2
>
>
> Currently each cache maintains its own {{AffinityFunctionContext}}. This
> leads to the case that {{previousAssignment}} can be different for two caches
> created on different topology versions. In particular, this broke
> {{FairAffinityFunction}} which was removed because of that.
> We should do the following:
> * Make sure that {{previousAssignment}} is consistent for all caches with
> same affinity function, regardless of topology versions caches were created
> on.
> * Add mechanism to enforce equality check for affinity functions. We probably
> will need to force user to implement {{equals}} for cache node filter and
> backup filter.
> * When above is done, bring back {{FairAffinityFunction}}.
> This is also discussed on dev list:
> http://apache-ignite-developers.2346864.n4.nabble.com/Resurrect-FairAffinityFunction-td19987.html
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