parquet.hadoop2.TestInputOutputFormat.java Source code

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Here is the source code for parquet.hadoop2.TestInputOutputFormat.java

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/**
 * 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());
        }
    }

}