Hypertable is a high performance, open source, massively scalable database modeled after Bigtable, Google's proprietary, massively scalable database. Hypertable runs on top of a distributed file system such as the Apache HDFS, GlusterFS or the CloudStore Kosmos File System (KFS). It is written almost entirely in C++ as the developers believed it had significant performance advantages over Java.
Hypertable software was originally developed at the company Zvents before 2008. Doug Judd was a promoter of Hypertable. In January 2009, Baidu, the Chinese language search engine, became a project sponsor. A version 0.9.2.1 was described in a blog in February 2009. Development ended in March 2016.
Timestamp is used internally to provide snapshot isolation for queries.
Hypertable backup by output table data in random order.
Over time, the RangeServers will write in-memory CellCaches to on-disk files, called CellStores. CellStores contain a series of sorted blocks of compressed sorted key/value pairs. These blocks are the minimum unit of data transfer from disk. User can choose the compressor used to compress CellStore blocks in each access group. The compressor option includes zlib, lzo, quicklz, snappy, bmz, none. The default compressor is quicklz.