Command like SQL LIMIT in HBase

Question

Does HBase have any command that works like SQL LIMIT query?

I can do it by setStart and setEnd, but I do not want to iterate all rows.

Answer 1

From the HBase shell you can use LIMIT:

hbase> scan 'test-table', {'LIMIT' => 5} 

From the Java API you can use Scan.setMaxResultSize(N) or scan.setMaxResultsPerColumnFamily(N).

• HBase API docs - Scan.setMaxResultSize
• HBase API docs - Scan.setMaxResultsPerColumnFamily

Answer 2

There is a filter called PageFilter. Its meant for this purpose.

Scan scan = new Scan(Bytes.toBytes("smith-")); scan.addColumn(Bytes.toBytes("personal"), Bytes.toBytes("givenName")); scan.addColumn(Bytes.toBytes("contactinfo"), Bytes.toBytes("email")); scan.setFilter(new PageFilter(25)); ResultScanner scanner = table.getScanner(scan); for (Result result : scanner) {     // ... } 

http://java.dzone.com/articles/handling-big-data-hbase-part-4