into(Spark/HDFS, SQL DBs)

migration from blaze

https://github.com/ContinuumIO/blaze/issues/582

reposting for ease of use:

from @chdoig

As Spark is becoming a popular backend, it's a common use case for people to want to transfer their datasets in DBs to a Spark/HDFS cluster.

It would be nice to have an easy interface for end-users to transfer their tables in DBs to a Cluster.

into(Spark/HDFS, SQL DBs)

A lot of people are talking now about tachyon, maybe worth taking a look:
http://tachyon-project.org/
http://ampcamp.berkeley.edu/big-data-mini-course/tachyon.html

This might be related with @quasiben work on SparkSQL. Maybe a barrier for people to star using SparkSQL is how they should make that transfer since:

> A SchemaRDD can be created from an existing RDD, Parquet file, a JSON dataset, or by running HiveQL against data stored in Apache Hive.

But I'm not able to find how you make that connection from existing SQL DBs:
http://spark.apache.org/docs/latest/sql-programming-guide.html

cc: @mrocklin