We calculate all of our gravel and sand by the tonnage formula: Length (FT) x Width (FT) x Depth (IN), Divide by 200, Multiply by 1.103 = Metric Tonnes. Divide your Metric Tonnes by 1.3 (approximate weight per yard) to get your final yardage.
HBase is an open-source, distributed, column-oriented store modeled after Google's Bigtable. Just as Bigtable leverages the distributed data storage provided by the Google File System, HBase provides Bigtable-like capabilities on top of Hadoop. It... (more)
HDFS doesn't do random reads very well. HBase on the other hand is a database that stores it's data in a distributed filesystem. The filesystem of choice typically is HDFS owing to the tight integration between HBase and HDFS. Having said that, it doesn't mean that HBase can't work on any other filesystem.