Fluo Recipes has some helper code for Apache Spark. Most of the helper code is currently related to bulk importing data into Accumulo. This is useful for initializing a new Fluo table with historical data via Spark. The Spark helper code is found at org/apache/fluo/recipes/spark/.
For information on using Spark to load data into Fluo, check out this blog post.
If you know of other Spark+Fluo integration code that would be useful, then please consider opening an issue.