||BaseDBConfiguration re-maps the Catalog object created by ConfigurationMapping:
Instead of mapping nodes to relations to chunks (partitions), it maps chunks to
hosts (nodes) for a given relation.
||HadoopDB Catalog: Simple XML file based implementation.
||This simple catalog generator assumes that is partitioned uniformly across all nodes and
assigns ids that follow the node ordering in the instances input file provided.
||This class randomly replicates chunked and unchunked databases across a cluster.