parquet-test-hadoop2/src/test/java/parquet/hadoop2/TestInputOutputFormat.java

/**
 * Copyright 2012 Twitter, Inc.
 *
 * 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 parquet.hadoop2;

import static java.lang.Thread.sleep;
import static org.junit.Assert.assertTrue;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertNull;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.IOException;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.LongWritable;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapreduce.Job;
import org.apache.hadoop.mapreduce.Mapper;
import org.apache.hadoop.mapreduce.lib.input.TextInputFormat;
import org.apache.hadoop.mapreduce.lib.output.TextOutputFormat;
import org.junit.Test;

import parquet.Log;
import parquet.example.data.Group;
import parquet.example.data.simple.SimpleGroupFactory;
import parquet.hadoop.example.ExampleInputFormat;
import parquet.hadoop.example.ExampleOutputFormat;
import parquet.hadoop.example.GroupWriteSupport;
import parquet.hadoop.metadata.CompressionCodecName;
import parquet.schema.MessageTypeParser;

public class TestInputOutputFormat {
  private static final Log LOG = Log.getLog(TestInputOutputFormat.class);

  public static class MyMapper extends Mapper<LongWritable, Text, Void, Group> {
    private SimpleGroupFactory factory;
    protected void setup(org.apache.hadoop.mapreduce.Mapper<LongWritable,Text,Void,Group>.Context context) throws java.io.IOException ,InterruptedException {
      factory = new SimpleGroupFactory(GroupWriteSupport.getSchema(context.getConfiguration()));
    };
    protected void map(LongWritable key, Text value, Mapper<LongWritable,Text,Void,Group>.Context context) throws java.io.IOException ,InterruptedException {
      Group group = factory.newGroup()
          .append("line", (int)key.get())
          .append("content", value.toString());
      context.write(null, group);
    }
  }

  public static class MyMapper2 extends Mapper<Void, Group, LongWritable, Text> {
    protected void map(Void key, Group value, Mapper<Void,Group,LongWritable,Text>.Context context) throws IOException ,InterruptedException {
      context.write(new LongWritable(value.getInteger("line", 0)), new Text(value.getString("content", 0)));
    }

  }

  @Test
  public void testReadWrite() throws IOException, ClassNotFoundException, InterruptedException {
    final Configuration conf = new Configuration();
    final Path inputPath = new Path("src/test/java/parquet/hadoop2/TestInputOutputFormat.java");
    final Path parquetPath = new Path("target/test/hadoop2/example/TestInputOutputFormat/parquet");
    final Path outputPath = new Path("target/test/hadoop2/example/TestInputOutputFormat/out");
    final FileSystem fileSystem = parquetPath.getFileSystem(conf);
    fileSystem.delete(parquetPath, true);
    fileSystem.delete(outputPath, true);
    {
      final Job job = new Job(conf, "write");
      TextInputFormat.addInputPath(job, inputPath);
      job.setInputFormatClass(TextInputFormat.class);
      job.setNumReduceTasks(0);
      ExampleOutputFormat.setCompression(job, CompressionCodecName.GZIP);
      ExampleOutputFormat.setOutputPath(job, parquetPath);
      job.setOutputFormatClass(ExampleOutputFormat.class);
      job.setMapperClass(TestInputOutputFormat.MyMapper.class);
      ExampleOutputFormat.setSchema(
          job,
          MessageTypeParser.parseMessageType(
              "message example {\n" +
              "required int32 line;\n" +
              "required binary content;\n" +
              "}"));
      job.submit();
      waitForJob(job);
    }
    {
      final Job job = new Job(conf, "read");
      job.setInputFormatClass(ExampleInputFormat.class);
      ExampleInputFormat.setInputPaths(job, parquetPath);
      job.setOutputFormatClass(TextOutputFormat.class);
      TextOutputFormat.setOutputPath(job, outputPath);
      job.setMapperClass(TestInputOutputFormat.MyMapper2.class);
      job.setNumReduceTasks(0);
      job.submit();
      waitForJob(job);
    }

    final BufferedReader in = new BufferedReader(new FileReader(new File(inputPath.toString())));
    final BufferedReader out = new BufferedReader(new FileReader(new File(outputPath.toString(), "part-m-00000")));
    String lineIn;
    String lineOut = null;
    int lineNumber = 0;
    while ((lineIn = in.readLine()) != null && (lineOut = out.readLine()) != null) {
      ++ lineNumber;
      lineOut = lineOut.substring(lineOut.indexOf("\t") + 1);
      assertEquals("line " + lineNumber, lineIn, lineOut);
    }
    assertNull("line " + lineNumber, lineIn);
    assertNull("line " + lineNumber, out.readLine());
    assertTrue(lineNumber > 0);
    in.close();
    out.close();
  }

  private void waitForJob(Job job) throws InterruptedException, IOException {
    while (!job.isComplete()) {
      LOG.debug("waiting for job " + job.getJobName());
      sleep(100);
    }
    LOG.info("status for job " + job.getJobName() + ": " + (job.isSuccessful() ? "SUCCESS" : "FAILURE"));
    if (!job.isSuccessful()) {
      throw new RuntimeException("job failed " + job.getJobName());
    }
  }

}