Denormalization is an important step while converting RDB data to HBase.
HareDB Data Model Management is a GUI tool for it as above.
This tool provides an merge table function, it can help you merge tables which have relationships in RDB.
It provides not only an schama redesigner but also an data loader from RDB to HBase.
This tool can reduce time cost of migration project which is from RDB to HBase.
haredbdatamodel works nicely