gistfile1.txt

    public boolean has_key(String keySpace, String columnFamilyName, String key) throws Exception {
        TTransport tr = new TSocket("localhost", 9160);
        TProtocol proto = new TBinaryProtocol(tr);
        Cassandra.Client client = new Cassandra.Client(proto);
        tr.open();

        SlicePredicate predicate = new SlicePredicate();
        SliceRange sliceRange = new SliceRange();
        sliceRange.setCount(1);
        sliceRange.setStart(new byte[0]);
        sliceRange.setFinish(new byte[0]);
        predicate.setSlice_range(sliceRange);
        ColumnParent columnParent = new ColumnParent(columnFamilyName);
        List<ColumnOrSuperColumn> result = client.get_slice(keySpace, key, columnParent, predicate, ConsistencyLevel.ALL);
        return result.size() > 0;
    }