AbstractGangliaSink is used by the hadoop-metrics2 package to emit metrics to Ganglia. Currently, this class uses the apache commons-configuration package to read from the hadoop-metrics2.properties file. commons-configuration is outdated, and has a bug where the .getString function drops everything after the first comma. This change uses .getList instead, which will work for one or many Ganglia sink servers.
This is fixed in trunk by upgrading to commons-configuration2, which doesn't have the bug anymore.