Right now I implement row count over ResultScanner
like this
for (Result rs = scanner.next(); rs != null; rs = scanner.next()) {
number++;
}
If data reaching millions time computing is large.I want to compute in real time that i don't want to use Mapreduce
How to quickly count number of rows.
Use RowCounter in HBase RowCounter is a mapreduce job to count all the rows of a table. This is a good utility to use as a sanity check to ensure that HBase can read all the blocks of a table if there are any concerns of metadata inconsistency. It will run the mapreduce all in a single process but it will run faster if you have a MapReduce cluster in place for it to exploit.
$ hbase org.apache.hadoop.hbase.mapreduce.RowCounter <tablename>
Usage: RowCounter [options]
<tablename> [
--starttime=[start]
--endtime=[end]
[--range=[startKey],[endKey]]
[<column1> <column2>...]
]