SequenceFileWriteDemo.java

/**
 * Copyright 2011 Nube Technologies
 *
 * Licensed 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 co.nubetech.hiho.testdata;

import java.io.IOException;
import java.net.URI;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.IOUtils;
import org.apache.hadoop.io.IntWritable;
import org.apache.hadoop.io.SequenceFile;
import org.apache.hadoop.io.Text;

public class SequenceFileWriteDemo {
	private static final String[] DATA = { "A, B, C, D, E",
			"A1, B1, C1, D1, E1" };

	public static void main(String[] args) throws IOException {
		String uri = "input2.seq";
		Configuration conf = new Configuration();
		FileSystem fs = FileSystem.get(URI.create(uri), conf);
		Path path = new Path(uri);
		IntWritable key = new IntWritable();
		Text value = new Text();
		SequenceFile.Writer writer = null;
		try {
			writer = SequenceFile.createWriter(fs, conf, path, key.getClass(),
					value.getClass());
			for (int i = 0; i < 2; i++) {
				key.set(2 - i);
				value.set(DATA[i % DATA.length]);
				System.out.printf("[%s]\t%s\t%s\n", writer.getLength(), key,
						value);
				writer.append(key, value);
			}
		} catch (Exception e) {
			e.printStackTrace();
		} finally {
			IOUtils.closeStream(writer);
		}
	}
}