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

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Here is the source code for com.tdunning.plume.local.lazy.MapRedOnlyFlattensTest.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.collectionOf;
import static com.tdunning.plume.Plume.strings;

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.Text;
import org.junit.Test;

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

/**
 * This test checks that an MSCR is created out of a workplan that consists only of Flatten operations. There is more than one
 * {@link Flatten} and these have co-related inputs, so they have to be merged into a single MSCR.
 */
public class MapRedOnlyFlattensTest {

    static String inputPathEvent2 = "/tmp/input-event2.txt";
    static String inputPathLogFile2 = "/tmp/input-logfile2.txt";
    static String inputPathLogFile = "/tmp/input-logfile.txt";

    public static class MapRedOnlyFlattensTestWorkflow extends PlumeWorkflow {

        @SuppressWarnings({ "unchecked", "rawtypes" })
        @Override
        public void build() {
            init();

            LazyPlume plume = new LazyPlume();
            // Get input files
            PCollection inputEvent2, inputLogFile, inputLogFile2;
            try {
                inputEvent2 = plume.readFile(inputPathEvent2, collectionOf(strings()));
                inputLogFile2 = plume.readFile(inputPathLogFile2, collectionOf(strings()));
                inputLogFile = plume.readFile(inputPathLogFile, collectionOf(strings()));
                // Add as inputs
                addInput(inputEvent2);
                addInput(inputLogFile);
            } catch (IOException e) {
                throw new RuntimeException();
            }

            /**
             * Emit the user of the log file - flatten it with users file
             */
            PCollection output = plume.flatten(collectionOf(strings()), inputEvent2,
                    inputLogFile.map(new DoFn<Text, Text>() {
                        @Override
                        public void process(Text v, EmitFn<Text> emitter) {
                            String[] splittedLine = v.toString().split("\t");
                            emitter.emit(new Text(splittedLine[2]));
                        }
                    }, collectionOf(strings())));

            /**
             * Flatten two log files
             */
            PCollection output2 = plume.flatten(collectionOf(strings()), inputLogFile2, inputLogFile);

            addOutput(output);
            addOutput(output2);
        }
    }

    @Test
    public void test() throws Exception {
        String outputPath = "/tmp/output-plume-onlyflattentest";
        // Prepare input for test
        FileSystem system = FileSystem.getLocal(new Configuration());
        system.copyFromLocalFile(new Path(Resources.getResource("event2users.txt").getPath()),
                new Path(inputPathEvent2));
        system.copyFromLocalFile(new Path(Resources.getResource("eventslog.txt").getPath()),
                new Path(inputPathLogFile));
        system.copyFromLocalFile(new Path(Resources.getResource("eventslog.txt").getPath()),
                new Path(inputPathLogFile2));
        // Prepare output for test
        system.delete(new Path(outputPath), true);
        // Prepare workflow
        MapRedOnlyFlattensTestWorkflow workFlow = new MapRedOnlyFlattensTestWorkflow();
        // Execute it
        MapRedExecutor executor = new MapRedExecutor();
        executor.execute(workFlow, outputPath);
    }
}