Hbase - get column names for row by column name prefix - hadoop

Question

I have a Hbase Table with the following description.
For a row key, my column would be of the form a_1, a_2,a_3,b_1,c_1,C_2 and so on, a compound key format.
Suppose one of my row is of the form
row key - row1
column family - c1
columns - a_1, a_2,a_3,b_1,b_2,c_1,C_2,d_9,d_99
Can I, by any operation retrieve a,b,c,d as the columns corresponding to row1, I am not bothered about whatever be the suffixes for a,b,c...
I can get all column names for a given row, add them to set by splitting the row keys by their first part and emit the set. I am worried, if there would be a better way of doing it by filters or some other hbase way of getting it done, please comment...

Answer 1

You can use COlumnPrefixFilter for that. You can see the following code
Configuration hadoopConf = new Configuration();
hadoopConf.set("hbase.zookeeper.quorum", "localhost");
hadoopConf.set("hbase.zookeeper.property.clientPort", "2181");
HTable hTable = new HTable(hadoopConf, "KunderaExamples");
Scan scan = new Scan();
scan.setFilter(new ColumnPrefixFilter("A".getBytes()));
ResultScanner scanner = hTable.getScanner(scan);
Iterator<Result> resultsIter = scanner.iterator();
while (resultsIter.hasNext())
{
Result result = resultsIter.next();
List<KeyValue> values = result.list();
for (KeyValue value : values)
{
System.out.println(value.getKey());
System.out.println(new String(value.getQualifier()));
System.out.println(value.getValue());
}
}