This page describes how Pig interoperates with other platforms, such as HBase and Hive.
Pig and Cassandra
A loader for loading Cassandra data into Pig. Works with Pig 0.7.0 (branched but not yet released as of 3/31/2010).
Pig and HBase
In Pig 0.6 and before, the built in HBaseStorage can be used to load data from Hbase. Work is ongoing to enhance this loader and make it a storage function also. See http://issues.apache.org/jira/browse/PIG-1205
Pig and Hive RCFiles
The HiveColumnarLoader, available as part of PiggyBank in Pig 0.7.0.