BOOM-FS

HDFS design is based on GFS.

File system metadata is stored at a centralized NameNode.

File data is partitioned into chunks and is replicated at three DataNodes to provide fault-tollerance.

Represent file system metadata as a collection of relations.

File system metadata durability ensured by Overlog.

Calculate fully qualified pathname of a file with recursion.

Cache calculation can be enabled in Overlog for specified relation (e.g. for fully qualified pathname calculation).

Three protocols (Heartbeat and Metadata Access in Overlog, File Data Access in Java).