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https://issues.apache.org/jira/browse/IGNITE-1553?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16430580#comment-16430580
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Alexey Goncharuk commented on IGNITE-1553:
------------------------------------------

[~Alexey Kuznetsov], agree, let's postpone this ticket for now. We will need 
this ability to make transactional writes to third-party databases together 
with Ignite native persistence.

> Optimize transaction prepare step when store is enabled
> -------------------------------------------------------
>
>                 Key: IGNITE-1553
>                 URL: https://issues.apache.org/jira/browse/IGNITE-1553
>             Project: Ignite
>          Issue Type: Improvement
>          Components: cache
>    Affects Versions: ignite-1.4
>            Reporter: Alexey Goncharuk
>            Assignee: Alexey Kuznetsov
>            Priority: Major
>              Labels: important
>
> Currently entries are enlisted in a database transaction after grid 
> transaction is in PREPARED state. We can do this in parallel in the following 
> fashion (pseudo-code):
> {code:java}
> fut = tx.prepareAsync();
> db.write(tx.writes());
> fut.get();
> try {
>     db.commit();
>     
>     tx.commit();
> }
> catch (Exception e) {
>     tx.rollback();
> }
> {code}
> If this approach is applied, we should be able to reduce latency for 
> transactions when write-through is enabled.
>  
> store prepare works on primary nodes only



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