// insert data
Column nameColumn = new Column(ByteBuffer.wrap("name".getBytes()));
nameColumn.setValue("John Dow".getBytes());
nameColumn.setTimestamp(System.currentTimeMillis());
ColumnParent columnParent = new ColumnParent(columnFamily);
try {
client.insert(ByteBuffer.wrap(key_user_id.getBytes()), columnParent, nameColumn, ConsistencyLevel.ALL);
} catch (Exception e) {
System.err.println("testInsert: " + e.getClass().getSimpleName() + ": " + e.getMessage());
}