Hama consists of three major components: BSPMaster, GroomServers and Zookeeper.

If a schema is not specified, all the columns in the table will be returned.

Since it writes to multiple destinations, and thus, instead of a directory specification, it requires a pattern specification.

HCatLoader accepts a table to read data from; you can indicate which partitions to scan by immediately following the load statement with a partition filter statement.

PyLucene is a Python extension for accessing Java LuceneTM.

Java implementation uses NIO channels.