 and Facebook (Christophe Bisciglia, Amr Awadallah and Jeff Hammerbacher, respectively) joined by a former Oracle executive (Mike Olson).Olson was the CEO of Sleepycat Software, the creator of the open-source embedded database engine Berkeley DB (acquired by Oracle in 2006).Awadallah was from Yahoo!, where he ran one of the first business units using Apache Hadoop for data analysis.