org.apache.crunch.MaterializeIT.java Source code

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Here is the source code for org.apache.crunch.MaterializeIT.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.crunch;

import java.io.IOException;
import java.util.List;

import com.google.common.collect.Iterables;
import org.apache.crunch.impl.mem.MemPipeline;
import org.apache.crunch.impl.mr.MRPipeline;
import org.apache.crunch.materialize.MaterializableIterable;
import org.apache.crunch.test.Person;
import org.apache.crunch.test.StringWrapper;
import org.apache.crunch.test.TemporaryPath;
import org.apache.crunch.test.TemporaryPaths;
import org.apache.crunch.types.PTypeFamily;
import org.apache.crunch.types.avro.AvroTypeFamily;
import org.apache.crunch.types.avro.Avros;
import org.apache.crunch.types.writable.WritableTypeFamily;
import org.apache.hadoop.conf.Configuration;
import org.junit.Assume;
import org.junit.Rule;
import org.junit.Test;

import com.google.common.collect.Lists;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertTrue;

public class MaterializeIT {

    @Rule
    public TemporaryPath tmpDir = TemporaryPaths.create();

    @Test
    public void testMaterializeInput_Writables() throws IOException {
        runMaterializeInput(new MRPipeline(MaterializeIT.class, tmpDir.getDefaultConfiguration()),
                WritableTypeFamily.getInstance());
    }

    @Test
    public void testMaterializeInput_Avro() throws IOException {
        runMaterializeInput(new MRPipeline(MaterializeIT.class, tmpDir.getDefaultConfiguration()),
                AvroTypeFamily.getInstance());
    }

    @Test
    public void testMaterializeInput_InMemoryWritables() throws IOException {
        runMaterializeInput(MemPipeline.getInstance(), WritableTypeFamily.getInstance());
    }

    @Test
    public void testMaterializeInput_InMemoryAvro() throws IOException {
        runMaterializeInput(MemPipeline.getInstance(), AvroTypeFamily.getInstance());
    }

    @Test
    public void testMaterializeEmptyIntermediate() throws IOException {
        runMaterializeEmptyIntermediate(new MRPipeline(MaterializeIT.class, tmpDir.getDefaultConfiguration()));
    }

    @Test
    public void testMaterializeEmptyIntermediate_InMemory() throws IOException {
        runMaterializeEmptyIntermediate(MemPipeline.getInstance());
    }

    @Test(expected = CrunchRuntimeException.class)
    public void testMaterializeFailure() throws IOException {
        runMaterializeWithFailure(new MRPipeline(MaterializeIT.class, tmpDir.getDefaultConfiguration()));
    }

    @Test
    public void testMaterializeNoFailure() throws IOException {
        Configuration conf = tmpDir.getDefaultConfiguration();
        conf.setBoolean("crunch.empty.materialize.on.failure", true);
        runMaterializeWithFailure(new MRPipeline(MaterializeIT.class, conf));
    }

    public void runMaterializeInput(Pipeline pipeline, PTypeFamily typeFamily) throws IOException {
        List<String> expectedContent = Lists.newArrayList("b", "c", "a", "e");
        String inputPath = tmpDir.copyResourceFileName("set1.txt");

        PCollection<String> lines = pipeline.readTextFile(inputPath);
        assertEquals(expectedContent, Lists.newArrayList(lines.materialize()));
        pipeline.done();
    }

    public void runMaterializeEmptyIntermediate(Pipeline pipeline) throws IOException {
        String inputPath = tmpDir.copyResourceFileName("set1.txt");
        PCollection<String> empty = pipeline.readTextFile(inputPath).filter(new FilterAll<String>(false));
        assertTrue(Iterables.isEmpty(empty.materialize()));
        pipeline.done();
    }

    public void runMaterializeWithFailure(Pipeline pipeline) throws IOException {
        String inputPath = tmpDir.copyResourceFileName("set1.txt");
        PCollection<String> empty = pipeline.readTextFile(inputPath).filter(new FilterAll<String>(true));
        empty.materialize().iterator();
        pipeline.done();
    }

    static class FilterAll<T> extends FilterFn<T> {

        private final boolean throwException;

        public FilterAll(boolean throwException) {
            this.throwException = throwException;
        }

        @Override
        public boolean accept(T input) {
            if (throwException) {
                throw new RuntimeException("This is an exception");
            }
            return false;
        }
    }

    static class StringToStringWrapperPersonPairMapFn extends MapFn<String, Pair<StringWrapper, Person>> {

        @Override
        public Pair<StringWrapper, Person> map(String input) {
            Person person = new Person();
            person.name = input;
            person.age = 42;
            person.siblingnames = Lists.<CharSequence>newArrayList();
            return Pair.of(new StringWrapper(input), person);
        }

    }

    @Test
    public void testMaterializeAvroPersonAndReflectsPair_GroupedTable() throws IOException {
        Assume.assumeTrue(Avros.CAN_COMBINE_SPECIFIC_AND_REFLECT_SCHEMAS);
        Pipeline pipeline = new MRPipeline(MaterializeIT.class);
        MaterializableIterable<Pair<StringWrapper, Person>> mi = (MaterializableIterable) pipeline
                .readTextFile(tmpDir.copyResourceFileName("set1.txt"))
                .parallelDo(new StringToStringWrapperPersonPairMapFn(),
                        Avros.pairs(Avros.reflects(StringWrapper.class), Avros.records(Person.class)))
                .materialize();

        // We just need to make sure this doesn't crash
        assertEquals(4, Iterables.size(mi));
        assertTrue(mi.getPipelineResult().succeeded());
    }
}