[hibernate-issues] [Hibernate-JIRA] Commented: (HSHARDS-49) flush all sub sessions before commit when 2PC is not used

[Emmanuel Bernard (JIRA)]

    [ http://opensource.atlassian.com/projects/hibernate/browse/HSHARDS-49?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_29290 ] 

Emmanuel Bernard commented on HSHARDS-49:
-----------------------------------------

The hibernate.transaction.factory_class
can give a clue. If it's JDBCTransactionFactory that's not 2PC
If it's CMTTransactionFactory, JoinableCMTTransactionFactory, JTATransactionFactory, the underlying resources are JTA, I imagine the Appserver/JTA coordinater will yell if more than one resource is not XA (am I correct?)
So we could try and guess based on that.

The other strategy is to ask the user to tell us through a shard property

> flush all sub sessions before commit when 2PC is not used
> ---------------------------------------------------------
>
>                 Key: HSHARDS-49
>                 URL: http://opensource.atlassian.com/projects/hibernate/browse/HSHARDS-49
>             Project: Hibernate Shards
>          Issue Type: New Feature
>          Components: engine
>    Affects Versions: 3.0.0.Beta2
>            Reporter: Emmanuel Bernard
>            Assignee: Max Ross
>            Priority: Minor
>
> When 2PC is not used, it can be interesting to minimize the risk and flush all operations before running all the commits.
> We might be able to guess that and disable the internal Hibernate flush for each session in this case, 
> we also could let this as a recommended pattern for users (trigger flush manually before commit)
> or we could do it during transaction.commit() maybe optionally (define a flag property)

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