HTable hTable = new HTable(HBaseConnection.getConfiguration(),tablename);

Scan s = new Scan();
s.setBatch(batchSize);
s.setCaching(cachingSize);
s.setCacheBlocks(true);
s.addFamily(ColumnFamily1);
s.addFamily(ColumnFamily2);
// at this point I need something like s.addFilter(FilterBiggerThan25k) or something like that

ResultScanner scanner = hTable.getScanner(s);
for (Result res = scanner.next(); res != null; res = scanner.next()) {
// do something for rows where column amount > 25000
...
}