Igor Seliverstov updated IGNITE-6935:
    Fix Version/s:     (was: 2.5)

> SQL TX: Locking protocol for simple queries
> -------------------------------------------
>                 Key: IGNITE-6935
>                 URL: https://issues.apache.org/jira/browse/IGNITE-6935
>             Project: Ignite
>          Issue Type: Task
>          Components: cache, sql
>            Reporter: Vladimir Ozerov
>            Assignee: Igor Seliverstov
>            Priority: Major
>              Labels: iep-3
>             Fix For: 2.6
> We need to develop locking protocol for SQL queries. Design considerations:
> 1) Use {{GridNeaLockRequest|Response}} as a template for new messages
> 2) Cover only queries which doesn't require reduce stage (see server-side DML 
> optimization code, e.g. {{GridH2DmlRequest}}).
> 3) When next entry is found, try locking it. If it is already locked, then 
> register current TX as candidate in MVCC manager and go to the next row. 
> Other TXes will notify use when entries are released. Send a response when 
> all entries are locked.
> 4) Read entry version before locking and after. If they doesn't match (i.e. 
> concurrent modification occurred), then throw an exception.

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