Exporting Large Datasets

If you are exporting a very large dataset, you can’t call collect() or
a similar action to read all the data from the RDD onto the single driver
program - that could trigger out of memory problems. Instead, you have to be careful about saving a large RDD. See these two sections for more information.

• Save the RDD to Files - There are built in methods in Spark for saving a large RDD to files.
• Save the RDD to a Database - This section contains recommended best practices for saving a large RDD to a database.