Evaluate ORM Frameworks which support non-relational column-oriented datastores 
and RDBMs 

                 Key: NUTCH-808
                 URL: https://issues.apache.org/jira/browse/NUTCH-808
             Project: Nutch
          Issue Type: Task
            Reporter: Enis Soztutar
            Assignee: Enis Soztutar

We have an ORM layer in the NutchBase branch, which uses Avro Specific Compiler 
to compile class definitions given in JSON. Before moving on with this, we 
might benefit from evaluating other frameworks, whether they suit our needs. 

We want at least the following capabilities:
- Using POJOs 
- Able to persist objects to at least HBase, Cassandra, and RDBMs 
- Able to efficiently serialize objects as task outputs from Hadoop jobs
- Allow native queries, along with standard queries 

Any comments, suggestions for other frameworks are welcome.

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