query hbase row-key

Question

can I query hbase to get all rows which row-key start with some string

something like scan 'Table_Name' 'ram%'

I want to get all rows that row-key starts with ram.

Answer 1

You can try using PrefixFilter to get rowkey's matching a specified prefix

hbase> scan 'TABLE_NAME', { FILTER => "PrefixFilter('ram')"}

Above statement in hbase shell will give you all the rowkey's that start with 'ram'.

From Java API you try this:

byte[] prefix=Bytes.toBytes("ram");
Scan scan = new Scan(prefix));
PrefixFilter prefixFilter = new PrefixFilter(prefix);
scan.addFilter(prefixFilter);
ResultScanner resultScanner = table.getScanner(scan);