Hbase quickly count number of rows

Question

Right now I implement row count over ResultScanner like this

for (Result rs = scanner.next(); rs != null; rs = scanner.next()) {
    number++;
}         


        

Answer 1

Go to Hbase home directory and run this command,

./bin/hbase org.apache.hadoop.hbase.mapreduce.RowCounter 'namespace:tablename'

This will launch a mapreduce job and the output will show the number of records existing in the hbase table.