Reading and Writing Data - Cassandra: The Definitive Guide - page 158

An example of using multiget slice is shown in Example 7-5 .
Example7-5.MultigetSliceExample.java
package com.cassandraguide.rw;
//imports omitted
public class MultigetSliceExample {
private static final ConsistencyLevel CL = ConsistencyLevel.ONE;
private static final String columnFamily = "Standard1";
public static void main(String[] args) throws UnsupportedEncodingException,
InvalidRequestException, UnavailableException,
TimedOutException,
TException, NotFoundException {
Connector conn = new Connector();
Cassandra.Client client = conn.connect();
System.out.println("Running Multiget Slice.");
SlicePredicate predicate = new SlicePredicate();
List<byte[]> colNames = new ArrayList<byte[]>();
colNames.add("a".getBytes());
colNames.add("c".getBytes());
predicate.column_names = colNames;
ColumnParent parent = new ColumnParent(columnFamily);
//instead of one row key, we specify many
List<byte[]> rowKeys = new ArrayList<byte[]>();
rowKeys.add("k1".getBytes());
rowKeys.add("k2".getBytes());
//instead of a simple list, we get a map, where the keys are row keys
//and the values the list of columns returned for each
Map<byte[],List<ColumnOrSuperColumn>> results =
client.multiget_slice(rowKeys, parent, predicate, CL);
for (byte[] key : results.keySet()) {
List<ColumnOrSuperColumn> row = results.get(key);
System.out.println("Row " + new String(key) + " --> ");