RE: kundera: Open source JPA 1.0 compliant ORM for Cassandra

[Animesh Kumar <an...@impetus.co.in>]

HI Michael,

We haven't tried Kundera with 0.7 beta yet. However, Kundera runs fine with 0.6.3

-Animesh

From: Michael Widmann [mailto:michael.widmann@gmail.com]
Sent: Saturday, July 31, 2010 9:02 PM
To: user@cassandra.apache.org
Subject: Re: kundera: Open source JPA 1.0 compliant ORM for Cassandra

Hi

could we run kundera on 0.7beta Version?

Thanks for answer

Michael
2010/7/31 Sanjay Sharma <sa...@impetus.co.in>>
Hi All,
We are happy to announce and share a new ORM over Cassandra - kundera
The project is Apache licensed and hosted at http://kundera.googlecode.com

The project uses custom Cassandra Annotations and is fully JPA 1.0 compliant. @ColumnFamily and @SuperColumnFamily are the main Cassandra specific annotations.

Search/Indexing is automatically included by using "Lucandra" and drives the JPA-QL query support. Use of Lucandra also enables users to write Lucene queries along with JPA-QL queries.

As per the main author of kundera - Animesh -" The idea behind Kundera is to make working with Cassandra drop-dead simple and fun. Kundera does not reinvent the wheel by making another client library; rather it leverages the existing libraries and builds - on top of them - a wrap-around API to help developers do away with unnecessary boiler plate codes, and program a neater-and-cleaner code that reduces code-complexity and improves quality. And above all, improves productivity."

The current implementation uses the versatile "Pelops" library as the underlying client API and plans are to add support for Hector and Thrift clients as well.

Here is a sample kundera Entity bean -
@Entity
@ColumnFamily(keyspace = "Keyspace1", family = "SimpleComment")
public class SimpleComment {
    @Id
    private String id;
    @Column(name = "userId")
    private String userId;
    @Column(name = "comment")
    private String commentText;

    ......
}
JPA queries are as simple as-

        Query query = entityManager.createQuery("SELECT c from SimpleComment c where userId='me'");

        List<SimpleComment> list = query.getResultList();

There is already support for Spring based persistence integration like the good old Spring+Hibernate integration and is as simple as this-
    <bean id="entityManagerFactory" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
        <property name="persistenceUnitName" value="myPersistenceUnit"/>
                </bean>
More examples are available in kundera's wiki<http://code.google.com/p/kundera/wiki> and Animesh's blog<http://anismiles.wordpress.com/2010/07/14/kundera-now-jpa-1-0-compatible/>s. The spring integration example is here<http://code.google.com/p/kundera/wiki/HowToUseKunderaWithSpring>

Regards,
Sanjay Sharma
iLabs, Impetus

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Impetus is sponsoring 'Hadoop India User Group Meet Up'- a technology un-conference on July 31, 2010 at Impetus Office, Noida. The event will shed light on Hadoop technology and channelized efforts to develop an active Hadoop community.

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RE: kundera: Open source JPA 1.0 compliant ORM for Cassandra

[Ashwin Jayaprakash <as...@gmail.com>]

Something like  http://carbonado.sourceforge.net/index.html Carbonado  would
also be cool. I'm not sure how JPA's relations would work on a de-normalized
form like Cassandra.
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RE: kundera: Open source JPA 1.0 compliant ORM for Cassandra

[Ashwin Jayaprakash <as...@gmail.com>]

Does the JPA adapter affect performance? It would be nice to see what
overhead (if any) it adds.

Looks cool though!
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