Add the following entries in /etc/hbase/conf/hadoop-metrics.properties or $HBASE_HOME/conf/hadoop-metrics.properties file
===========
thriftserver.class=org.apache.hadoop.metrics.ganglia.GangliaContext31
thriftserver.period=10
thriftserver.servers=<ganglia_multicast_address>:<ganglia_port>
===========
Restart hbase-thrift-server and you should see thrift metrics in ganglia interface.
