Apache HBase: How to count number of rows quickly

1124825 pts.
Tags:
Apache
Big Data
HBase
Currently in Apache HBase, I've been implementing row count over ResultScanner, like this:
for (Result rs = scanner.next(); rs != null; rs = scanner.next()) {
    number++;
}
But my data is starting to reach the millions so the computing is big. I'm trying to compute it real-time but I would like to stay away from MapReduce. Is there a way I can quickly count the rows? Thank you.
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