hadoop-tools/hadoop-streaming/src/test/java/org/apache/hadoop/streaming/OutputOnlyApp.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 org.apache.hadoop.streaming;

import java.io.IOException;

/**
 * An application that outputs a specified number of lines
 * without consuming any input.
 */
public class OutputOnlyApp {
  public static void main(String[] args) throws IOException {
    if (args.length < 1) {
      System.err.println("Usage: OutputOnlyApp NUMRECORDS");
      return;
    }
    int numRecords = Integer.parseInt(args[0]);
    while (numRecords-- > 0) {
      System.out.println("key\tvalue");
    }
  }
}