WordCountTez.java

/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package sample.tez;

import java.util.Map.Entry;
import java.util.concurrent.Future;
import java.util.stream.Stream;

import io.dstream.DStream;
import io.dstream.utils.ExecutionResultUtils;

/**
 * Sample of {@link DStream} application pre-configured to run on Apache Tez.
 */
public class WordCountTez {

	public static void main(String[] args) throws Exception {
		Future<Stream<Stream<Entry<String, Integer>>>> resultFuture = DStream.ofType(String.class, "wc")
				.flatMap(record -> Stream.of(record.split("\\s+")))
				.reduceValues(word -> word, word -> 1, Integer::sum)
				.executeAs("WordCountTez");

		Stream<Stream<Entry<String, Integer>>> resultPartitionsStream = resultFuture.get();
		ExecutionResultUtils.printResults(resultPartitionsStream, true);
		resultPartitionsStream.close();
	}
}