I once handled gobs of web tracking data in Cassandra, using Hadoop over Cassandra to build queryable rollups in MySQL and Pig for on the fly analysis Neither

I once handled gobs of web tracking data in Cassandra, using Hadoop over Cassandra to build queryable rollups in MySQL and Pig for on the fly analysis Neither tech works on its own, but together (substituting Cassandra columns for hdfs) was magic for the specific data configuration & use case.