org.apache.parquet.avro.TestInputOutputFormat.java Source code

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Here is the source code for org.apache.parquet.avro.TestInputOutputFormat.java

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/* 
 * 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.parquet.avro;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.IOException;
import java.util.Arrays;
import org.apache.avro.Schema;
import org.apache.avro.generic.GenericRecord;
import org.apache.avro.generic.GenericRecordBuilder;
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 org.apache.parquet.Log;

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

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

    private static Schema avroSchema;
    static {
        avroSchema = Schema.createRecord("record1", null, null, false);
        avroSchema.setFields(Arrays.asList(new Schema.Field("a",
                Schema.createUnion(Arrays.asList(Schema.create(Schema.Type.INT), Schema.create(Schema.Type.NULL))),
                null, null)));
    }

    public static GenericRecord nextRecord(Integer i) {
        return new GenericRecordBuilder(avroSchema).set("a", i).build();
    };

    public static class MyMapper extends Mapper<LongWritable, Text, Void, GenericRecord> {

        public void run(Context context) throws IOException, InterruptedException {
            for (int i = 0; i < 10; i++) {
                GenericRecord a;
                a = TestInputOutputFormat.nextRecord(i == 4 ? null : i);
                context.write(null, a);
            }
        }
    }

    public static class MyMapper2 extends Mapper<Void, GenericRecord, LongWritable, Text> {
        protected void map(Void key, GenericRecord value, Context context)
                throws IOException, InterruptedException {
            context.write(null, new Text(value.toString()));
        }

    }

    @Test
    public void testReadWrite() throws Exception {

        final Configuration conf = new Configuration();
        final Path inputPath = new Path("src/test/java/org/apache/parquet/avro/TestInputOutputFormat.java");
        final Path parquetPath = new Path("target/test/hadoop/TestInputOutputFormat/parquet");
        final Path outputPath = new Path("target/test/hadoop/TestInputOutputFormat/out");
        final FileSystem fileSystem = parquetPath.getFileSystem(conf);
        fileSystem.delete(parquetPath, true);
        fileSystem.delete(outputPath, true);
        {
            final Job job = new Job(conf, "write");

            // input not really used
            TextInputFormat.addInputPath(job, inputPath);
            job.setInputFormatClass(TextInputFormat.class);

            job.setMapperClass(TestInputOutputFormat.MyMapper.class);
            job.setNumReduceTasks(0);

            job.setOutputFormatClass(AvroParquetOutputFormat.class);
            AvroParquetOutputFormat.setOutputPath(job, parquetPath);
            AvroParquetOutputFormat.setSchema(job, avroSchema);

            waitForJob(job);
        }
        {
            final Job job = new Job(conf, "read");
            job.setInputFormatClass(AvroParquetInputFormat.class);
            AvroParquetInputFormat.setInputPaths(job, parquetPath);

            job.setMapperClass(TestInputOutputFormat.MyMapper2.class);
            job.setNumReduceTasks(0);

            job.setOutputFormatClass(TextOutputFormat.class);
            TextOutputFormat.setOutputPath(job, outputPath);

            waitForJob(job);
        }

        final BufferedReader out = new BufferedReader(
                new FileReader(new File(outputPath.toString(), "part-m-00000")));
        String lineOut = null;
        int lineNumber = 0;
        while ((lineOut = out.readLine()) != null) {
            lineOut = lineOut.substring(lineOut.indexOf("\t") + 1);
            GenericRecord a = nextRecord(lineNumber == 4 ? null : lineNumber);
            assertEquals("line " + lineNumber, a.toString(), lineOut);
            ++lineNumber;
        }
        assertNull("line " + lineNumber, out.readLine());
        out.close();
    }

    private void waitForJob(Job job) throws Exception {
        job.submit();
        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());
        }
    }

}