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https://issues.apache.org/jira/browse/IGNITE-9470?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16774297#comment-16774297
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Andrew Mashenkov commented on IGNITE-9470:
------------------------------------------

[~Pavlukhin], I've some comment to the PR.
 # IndexingSPI doesn't support mvcc. Let's create a ticket to rework public 
interface and remute failed tests.
For now, I'd add IndexingSPI checks into cache validation procedure and forbid 
it's usage.
 # CachePredicate is for internal usage only and it can't threw any exception. 
Let's remove 'mockEntryPredicate' and revert changes in test. Moreover this 
change overlap IndexingSPI failover.
 # Next check looks useless as class childs can be moved to Mvcc suite.

{noformat}
@Before
public void ensureForcedMvcc() {
  assert MvccFeatureChecker.forcedMvcc();
}
                        {noformat}

> MVCC TX: Mvcc transactions should throw proper exception when rolled back.
> --------------------------------------------------------------------------
>
>                 Key: IGNITE-9470
>                 URL: https://issues.apache.org/jira/browse/IGNITE-9470
>             Project: Ignite
>          Issue Type: Bug
>          Components: jdbc, mvcc, odbc
>            Reporter: Roman Kondakov
>            Assignee: Ivan Pavlukhin
>            Priority: Major
>              Labels: Muted_test, mvcc_stabilization_stage_1, transactions
>             Fix For: 2.8
>
>          Time Spent: 10m
>  Remaining Estimate: 0h
>
> When MVCC transaction is rolled back due to a write conflict it throws 
> {{CacheException}} with "Mvcc version mismatch" message. This behavior 
> violates Ignite transactions API. Instead it should throw 
> {{TransactionRollbackException}} with a clear message like a "Transaction has 
> been aborted due to a write conflict (Please try again.)"
> It is also need to propogate this changes to JDBC and ODBC components and fix 
> mvcc tests.
>  
> In some tests we have to repeat tx operation in case of version conflict. 
> Most likely, we can rely to caused-exception with some meaningful  type (e.g. 
> MvccVersionMismatchException) to repeat operation.
> Pay attention that tx could be aborted at different stages, but we should 
> fail consistently. Some examples:
> 1. Before next operation in tx started.
> 2. While operation in tx is in progress.
> 3. When {{tx.commit()}} is called.



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