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HBase Specific Features · Impetus/kundera Wiki · GitHub
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HBase Specific Features
Pragalbh Garg edited this page Mar 23, 2015
·
1 revision
Add below entry into XML configuration file:
<property name="hbase.zookeeper.quorum" value="localhost"></property>
<property name="hbase.zookeeper.property.clientPort" value="2181"></property>
You can specify column-family specific configurations and they will be applied on corresponding column families. Just put below comma-separated entry into XML file. A sample file is given below:
<?xml version="1.0" encoding="UTF-8"?>
<clientProperties>
<datastores>
<dataStore>
<name>hbase</name>
<connection>
<properties>
<property name="hbase.zookeeper.quorum" value="localhost"></property>
<property name="hbase.zookeeper.property.clientPort" value="2181"></property>
</properties>
</connection>
<schemas>
<schema>
<name>USERXYZ</name>
<tables>
<table>
<name>age</name>
<properties>
<property name="TTL" value="12345678" />
<property name="VERSIONS" value="6" />
<property name="MIN_VERSIONS" value="3" />
<property name="COMPRESSION" value="GZ" />
<property name="COMPRESSION_COMPACT" value="GZ" />
</properties>
</table>
<table>
<name>address</name>
<properties>
<property name="TTL" value="1234567" />
<property name="VERSIONS" value="5" />
<property name="MIN_VERSIONS" value="2" />
<property name="COMPRESSION" value="GZ" />
<property name="COMPRESSION_COMPACT" value="GZ" />
</properties>
</table>
</tables>
</schema>
</schemas>
</dataStore>
</datastores>
</clientProperties>
Kundera supports HBase Client Request Filters in order to perform even more granular queries. An example code snippet from here is shown below.
EntityManagerFactory emf = Persistence.createEntityManagerFactory("hbase_pu");
EntityManager em = emf.createEntityManager();
/* Returns you a map of persistence unit and Kundera Clients */
Map<String, Client> clients = (Map<String, Client>) em.getDelegate();
Client client = clients.get("hbase_pu");
//Create filter, it will apply on all operation on this entity manager
Filter f = new QualifierFilter();
f = new SingleColumnValueFilter("PERSON_NAME".getBytes(), "PERSON_NAME".getBytes(), CompareOp.EQUAL,
"vivek".getBytes());
((HBaseClient) client).setFilter(f); // Set filter in client
em.clear();
Query q = em.createQuery("Select p from Person p");
List<Person> results = q.getResultList(); //Filter on PERSON_NAME automatically applied
em.close();
emf.close();
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