HBase Shell provides Data Manipulation Language (DML) group commands to manipulate data in HBase. The DML group includes the commands
count, delete, deleteall, get, get_counter, incr, put, scan, and
truncate. Just as their names express, these commands provide basic access and update operations on data in HBase.
HBase has a feature called counter, which is useful to build a metrics gathering system on HBase.
incr are commands for counter operations.
count, scan, and
truncate commands may take time to finish when running them on a huge amount of data in HBase.
To count a big table, you should use the
rowcounter MapReduce job, which is shipped with HBase. We will describe it in the ...