The mapping between GPDB tables and GemFire regions need to be specified in a server-managed cache configuration xml file

gpdb-gemfire-mapping-config.xml

...
<jndi-bindings>
    <jndi-binding jndi-name="datasource" type="SimpleDataSource"
        jdbc-driver-class="org.postgresql.Driver" user-name="dbuser"
        password="dbpass" connection-url="jdbc:postgresql://10.64.20.1:5433/gemfire">
    </jndi-binding>
</jndi-bindings>
<region name="SentimentScore">
    <region-attributes refid="PARTITION">
        <partition-attributes redundant-copies="1" />
    </region-attributes>
    <gpdb:store datasource="datasource">
        <gpdb:synchronize mode="manual" persistent="false" />
        <gpdb:types>
            <gpdb:pdx name="io.pivotal.ds.gemfire.gpdb.entity.SentimentScore"
                table="sentiment_score">
                <gpdb:id>
                    <gpdb:field ref="phrase" />
                </gpdb:id>
                <gpdb:fields>
                    <gpdb:field name="phrase" column="phrase" />
                    <gpdb:field name="score" column="score" />
                </gpdb:fields>
            </gpdb:pdx>
        </gpdb:types>
    </gpdb:store>
</region>
...