this.prefix       = prefix;
}
@Override
public void open(Configuration parameters) throws Exception {
super.open(parameters);
<BUG>List<Tuple2<GradoopId, PropertyValue>> vertexMapping = getRuntimeContext()
</BUG>
.getBroadcastVariable(VERTEX_MAPPING);
vertexMap = initMapping(vertexMapping);
<BUG>List<Tuple2<GradoopId, PropertyValue>> edgeMapping = getRuntimeContext()
</BUG>
.getBroadcastVariable(EDGE_MAPPING);

this.prefix       = prefix;
}
@Override
public void open(Configuration parameters) throws Exception {
super.open(parameters);
List<Tuple2<K, PropertyValue>> vertexMapping = getRuntimeContext()
.getBroadcastVariable(VERTEX_MAPPING);
vertexMap = initMapping(vertexMapping);
List<Tuple2<K, PropertyValue>> edgeMapping = getRuntimeContext()
.getBroadcastVariable(EDGE_MAPPING);
