com.tdunning.plume.local.lazy.MapRedSequenceFileTest.java Source code

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Here is the source code for com.tdunning.plume.local.lazy.MapRedSequenceFileTest.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 com.tdunning.plume.local.lazy;

import static com.tdunning.plume.Plume.integers;
import static com.tdunning.plume.Plume.tableOf;
import static org.junit.Assert.*;

import java.io.File;
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.IntWritable;
import org.apache.hadoop.io.SequenceFile;
import org.apache.hadoop.mapreduce.Job;
import org.junit.Ignore;
import org.junit.Test;

import com.google.common.io.Files;
import com.tdunning.plume.DoFn;
import com.tdunning.plume.EmitFn;
import com.tdunning.plume.PCollection;
import com.tdunning.plume.Pair;

/**
 * The purpose of this test is to assert that {@link MapRedExecutor} behaves correctly with SequenceFile as input/output
 */
public class MapRedSequenceFileTest {

    final static String inputPath = "/tmp/input-simpletest/file";

    /**
     * This workflow will only load a <int,int> table and add one to each number
     */
    public static class OtherWorkflow extends PlumeWorkflow {

        public OtherWorkflow() {
        }

        @SuppressWarnings("unchecked")
        @Override
        public void build() {
            init();
            LazyPlume plume = new LazyPlume();
            PCollection input;
            try {
                // Get input file
                input = plume.readFile(inputPath, tableOf(integers(), integers()));
                // Add as input for this workflow
                addInput(input);
            } catch (IOException e) {
                throw new RuntimeException(e);
            }
            // Define its output
            PCollection output = input
                    .map(new DoFn<Pair<IntWritable, IntWritable>, Pair<IntWritable, IntWritable>>() {
                        @Override
                        public void process(Pair<IntWritable, IntWritable> v,
                                EmitFn<Pair<IntWritable, IntWritable>> emitter) {
                            emitter.emit(Pair.create(new IntWritable(v.getKey().get() + 1),
                                    new IntWritable(v.getValue().get() + 1)));
                        }
                    }, tableOf(integers(), integers())).groupByKey();

            // Add it as workflow's output
            addOutput(output);
        }
    }

    @Test
    public void test() throws Exception {
        /*
         * Create input which is SequenceFile<int,int> with data 1,2\n3,4
         */
        Configuration conf = new Configuration();
        Path p = new Path(inputPath);
        FileSystem localFS = FileSystem.getLocal(conf);
        if (localFS.exists(p)) {
            localFS.delete(p, true); // wipe it if needed
        }
        SequenceFile.Writer writer = SequenceFile.createWriter(localFS, conf, p, IntWritable.class,
                IntWritable.class);
        writer.append(new IntWritable(1), new IntWritable(2));
        writer.append(new IntWritable(3), new IntWritable(4));
        writer.close();
        String outputPath = "/tmp/output-plume-simpletest";
        // Prepare input for test
        FileSystem system = FileSystem.getLocal(new Configuration());
        // Prepare output for test
        system.delete(new Path(outputPath), true);
        // Prepare workflow
        OtherWorkflow workFlow = new OtherWorkflow();
        // Execute it
        MapRedExecutor executor = new MapRedExecutor();
        executor.execute(workFlow, outputPath);
        /*
         * Read output which is SequenceFile<int,int> and assert that it has data 2,3\n4,5
         */
        p = new Path(outputPath + "/1_1/1-r-00000");
        SequenceFile.Reader reader = new SequenceFile.Reader(localFS, p, conf);
        IntWritable key = new IntWritable(1);
        IntWritable value = new IntWritable(1);
        reader.next(key, value);
        assertEquals(key.get(), 2);
        assertEquals(value.get(), 3);
        reader.next(key, value);
        assertEquals(key.get(), 4);
        assertEquals(value.get(), 5);
        reader.close();
    }
}