Spark is an open source cluster computing system that provides primitives for fast in-memory processing of big data. It runs on top of Apache Mesos for efficient resource sharing. Shark is Hive built on Spark, allowing SQL queries over big data with low latency by running Hive queries using Spark's in-memory primitives. The presentation will demonstrate how Spark and Shark can provide low latency access to big data through in-memory processing and compare the performance of Shark to Hive.