Hadoop is an open-source solution for providing a distributed/replicated file system, a produciton grade map-reduce system, and has a series of complementary additions like Hive, Pig, and HBase to get more out of a Hadoop-powered cluster.
Hadoop is an Apache foundation sponsored project, with commercial support provided by multiple vendors, including Cloudera, Hortonworks, and MapR. Apache has a more complete set of commercial solutions documented.
Available complementary additions to Hadoop include:
- Hadoop distributed filesystem ( standard )
- The map-reduce architecture ( standard )
- Hive, which provides a SQL like interface to the M/R arch
- Hbase, a distributed key-value service
Recommended reference sources: