Vladimir Ozerov resolved IGNITE-3478.
    Resolution: Fixed

Resolving the ticket as base MVCC functionality is ready. Further development 
is performed under umbrella ticket IGNITE-4191.

> Multi-version concurrency control
> ---------------------------------
>                 Key: IGNITE-3478
>                 URL: https://issues.apache.org/jira/browse/IGNITE-3478
>             Project: Ignite
>          Issue Type: New Feature
>          Components: cache
>            Reporter: Alexey Goncharuk
>            Priority: Major
>              Labels: important
>             Fix For: 2.5
> Current Ignite SQL does not take into account transaction boundaries. For 
> example, if a transaction atomically changes balance of two accounts, then a 
> concurrent SQL query can see partially committed transaction. This works for 
> data analytics, but does not work for more strict and demanding scenarios.
> It would be perfect if we had a mode which ensures transaction boundaries are 
> taken into account for SQL query.

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