High Availability

[Teody <te...@gmail.com>]

Hi,

I have a question regarding Slice. If I configure an application to
replicate the persistence on multiple DBs using Slice, can a DB recover or
update itself if there was a transaction during some time that it was down?

If yes, is there a document that explains how to configure this?
If no, can someone suggest a good high availability framework that works
best with OpenJPA?

Thanks,
Teody :)

Re: High Availability

[Pinaki Poddar <pp...@apache.org>]

Hi,
  Currently Slice does not support failover. But it is on our road map. You
can add new slices dynamically [1] or specify 'lenient' [2] to ignore slices
that are configured but not currently reachable.

> good high availability framework that works best with OpenJPA?
  For MySQL, OpenJPA natively supports replication drivers [3] (meaning
OpenJPA is aware of this driver and switches read-only modes when
appropriate). Having said that, an HA database environment generally appears
as an unified database at JDBC level. If that is the case, then OpenJPA is
not even aware of the clustered, replicated database configuration as all it
sees/operates on is a JDBC connection. 


[1] http://ppoddar.blogspot.com/
[2] http://openjpa.apache.org/builds/latest/docs/manual/manual.html#d0e32402
[3]
http://dev.mysql.com/doc/refman/5.1/en/connector-j-reference-replication-connection.html


Teody wrote:
> 
> Hi,
> 
> I have a question regarding Slice. If I configure an application to
> replicate the persistence on multiple DBs using Slice, can a DB recover or
> update itself if there was a transaction during some time that it was
> down?
> 
> If yes, is there a document that explains how to configure this?
> If no, can someone suggest a good high availability framework that works
> best with OpenJPA?
> 
> Thanks,
> Teody :)
> 
> 


-----
Pinaki Poddar                      http://ppoddar.blogspot.com/
                                      
http://www.linkedin.com/in/pinakipoddar
OpenJPA PMC Member/Committer
JPA Expert Group Member
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