I know it's cool to bash MongoDB but it is really nicely integrated with Spark, extremely quick for a write workloads (3000 writes/second on our slow drives and that's inside the RDD map) and doesn't flinch even when getting it to write 1 billion rows in quick succession. One thing that is really nice is that being schemaless you don't have to worry about setting up tables structures beforehand.

You can look at Cassandra which is historically known for exceptional write performance.