As I work with larger enterprise clients, a few Hadoop themes have emerged. A common one is that most companies seem to be trying to avoid the pain they experienced in the heyday of JavaEE, SOA, and .Net -- as well as that terrible time when every department had to have its own portal.
To this end, they're trying to centralize Hadoop, in the way that many companies attempt to do with RDBMS or storage. Although you wouldn't use Hadoop for the same stuff you'd use an RDBMS for, Hadoop has many advantages over the RDBMS in terms of manageability. The row-store RDBMS paradigm (that is, Oracle) has inherent scalability limits, so when you attempt to create one big instance or RAC cluster to serve all, you end up serving none. With Hadoop, you have more ability to pool compute resources and dish them out.
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