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https://issues.apache.org/jira/browse/IGNITE-5736?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16135067#comment-16135067
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Vladimir Ozerov commented on IGNITE-5736:
-----------------------------------------

[~daradurvs], Ignite doesn't support compatibility between releases, so I am 
not sure what is the goal if this task. I think these changes will not be 
included into the product. All we need is a flag on configuration {e.g. 
BinaryConfiguration), which will control whether we write values as varint or 
not. It should be {{false}} by default, so that new Ignite has chances to start 
on persistent data produced by previous version.

I propose to close both IGNITE-5732 and IGNITE-5736 as "Won't Fix" and focus on 
implementation itself. 

> Add test of backward-compatibility
> ----------------------------------
>
>                 Key: IGNITE-5736
>                 URL: https://issues.apache.org/jira/browse/IGNITE-5736
>             Project: Ignite
>          Issue Type: Sub-task
>          Components: general
>            Reporter: Vyacheslav Daradur
>            Assignee: Vyacheslav Daradur
>             Fix For: 2.2
>
>
> Need to add unit-test to test compatibility with AI 2.0.



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