In-memory Caching in HDFS: Lower latency, same great taste by Andrew Wang.
From the post:
My coworker Colin McCabe and I recently gave a talk at Hadoop Summit Amsterdam titled “In-memory Caching in HDFS: Lower latency, same great taste.” I’m very pleased with how this feature turned out, since it was approximately a year-long effort going from initial design to production system. Combined with Impala, we showed up to a 6x performance improvement by running on cached data, and that number will only improve with time. Slides and video of our presentation are available online.
Finding data the person who signs the checks will be interested in seeing with 6X performance is left as an exercise for the reader. 😉