The document discusses the Hadoop ecosystem and different Hadoop distributions including Cloudera, Hortonworks, and vanilla Apache Hadoop. It notes that major companies are using Hadoop for applications like data warehousing, security, online advertising, and marketing intelligence. While Cloudera promotes replacing data warehouses with Hadoop, Hortonworks partners with data management vendors. Both Cloudera and Hortonworks provide support and improvements on open source Hadoop but take different business approaches. New technologies like Spark may also disrupt the Hadoop market. Using a distribution can provide integration benefits but may lock users into that vendor.