[rules-users] Drools Flow persistence to HBase

[Daniel Nathanson]

Has anyone ever tried to persist Drools Flow processes to HBase (or  
some other NoSQL DB)?  We are working on a cloud-based system sitting  
with HDFS and HBase for storage.  We would rather not introduce a  
RDBMS into the architecture simply to support Drools Flow's JPA  
requirement for persistence.

I've looked at datanucleus' JPA implementation which can talk to  
HBase, but from my limited knowledge of JPA, it doesn't look like  
their JPA for HBase implementation supports the Drools JPA  
requirements.  Specifically, HBase does not support generation of  
record IDs, joins, or inner selects. Similarly, it doesn't look like  
the Hadoop JDBC driver (with Hibernate) will work for the same reasons.

Regards,

Dan Nathanson