This section covers batch importing data into Apache Spark, such as seen in the non-streaming examples from Chapter 1. Those examples load data from files all at once into one RDD, processes that RDD, the job completes, and the program exits. In a production system, you could set up a cron job to kick off a batch job each night to process the last day's worth of log files and then publish statistics for the last day.
- Importing From Files covers caveats when importing data from files.
- Importing from Databases links to examples of reading data from databases.