Cassandra datasource is used to set up a connection to a Cassandra storage. In WSO2 DAS, you can create a HBase datasource by specifying the datasource configuration in the <DAS_HOME>/repository/conf/datasources/analytics-datasources.xml file as follows.
<datasource>
<name>WSO2_ANALYTICS_DS_CASSANDRA</name>
<description>The Cassandra datasource used for analytics</description>
<definition type="CASSANDRA">
<configuration>
<contactPoints>localhost</contactPoints>
<port>9042</port>
<username>admin</username>
<password>admin</password>
<clusterName>cluster1</clusterName>
<compression>NONE</compression>
<poolingOptions>
<coreConnectionsPerHost hostDistance="LOCAL">8</coreConnectionsPerHost>
<maxSimultaneousRequestsPerHostThreshold hostDistance="LOCAL">1024</maxSimultaneousRequestsPerHostThreshold>
</poolingOptions>
<queryOptions>
<fetchSize>5000</fetchSize>
<consistencyLevel>ONE</consistencyLevel>
<serialConsistencyLevel>SERIAL</serialConsistencyLevel>
</queryOptions>
<socketOptions>
<keepAlive>false</keepAlive>
<sendBufferSize>150000</sendBufferSize>
<connectTimeoutMillis>12000</connectTimeoutMillis>
<readTimeoutMillis>12000</readTimeoutMillis>
</socketOptions>
</configuration>
</definition>
</datasource>
For information on the above properties, and other properties that you can specify in this datasource configuration, go to Java Driver 2.0 for Apache Cassandra Documentation.