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From "Evgenii Zhuravlev (JIRA)" <j...@apache.org>
Subject [jira] [Assigned] (IGNITE-5836) AffinityFunctionContext should provide consistent previous assignment
Date Thu, 03 Aug 2017 10:03:09 GMT

     [ https://issues.apache.org/jira/browse/IGNITE-5836?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

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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