Look into Cassandra. Very fast writes and scales linearly (although there is some elbow grease involved in keyspace distribution). Our analytics platform guys a

Look into Cassandra. Very fast writes and scales linearly (although there is some elbow grease involved in keyspace distribution). Our analytics platform guys are very happy with it, after flirting with several other options (including big, beefy RDBMS). Great for large, flat, denormalized tables.