GroupReduceDriverTest.java example

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 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
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 *
 *     http://www.apache.org/licenses/LICENSE-2.0
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package org.apache.flink.runtime.operators.drivers;

import java.util.ArrayList;
import java.util.List;

import org.apache.flink.api.common.ExecutionConfig;
import org.apache.flink.api.common.functions.GroupReduceFunction;
import org.apache.flink.api.common.typeutils.TypeComparator;
import org.apache.flink.api.common.functions.RichGroupReduceFunction;
import org.apache.flink.api.java.tuple.Tuple2;
import org.apache.flink.api.java.typeutils.TupleTypeInfo;
import org.apache.flink.api.java.typeutils.TypeExtractor;
import org.apache.flink.runtime.operators.DriverStrategy;
import org.apache.flink.runtime.operators.GroupReduceDriver;
import org.apache.flink.runtime.util.EmptyMutableObjectIterator;
import org.apache.flink.runtime.util.RegularToMutableObjectIterator;
import org.apache.flink.types.IntValue;
import org.apache.flink.types.StringValue;
import org.apache.flink.util.Collector;
import org.apache.flink.util.MutableObjectIterator;
import org.junit.Assert;
import org.junit.Test;

@SuppressWarnings("serial")
public class GroupReduceDriverTest {

	@Test
	public void testAllReduceDriverImmutableEmpty() {
		try {
			TestTaskContext<GroupReduceFunction<Tuple2<String, Integer>, Tuple2<String, Integer>>, Tuple2<String, Integer>> context =
					new TestTaskContext<GroupReduceFunction<Tuple2<String, Integer>, Tuple2<String, Integer>>, Tuple2<String,Integer>>();
			
			List<Tuple2<String, Integer>> data = DriverTestData.createReduceImmutableData();
			TupleTypeInfo<Tuple2<String, Integer>> typeInfo = (TupleTypeInfo<Tuple2<String, Integer>>) TypeExtractor.getForObject(data.get(0));
			MutableObjectIterator<Tuple2<String, Integer>> input = EmptyMutableObjectIterator.get();
			TypeComparator<Tuple2<String, Integer>> comparator = typeInfo.createComparator(new int[]{0}, new boolean[] {true}, 0, new ExecutionConfig());
			context.setDriverStrategy(DriverStrategy.SORTED_GROUP_REDUCE);
			
			GatheringCollector<Tuple2<String, Integer>> result = new GatheringCollector<Tuple2<String,Integer>>(typeInfo.createSerializer(new ExecutionConfig()));
			
			context.setInput1(input, typeInfo.createSerializer(new ExecutionConfig()));
			context.setComparator1(comparator);
			context.setCollector(result);
			
			GroupReduceDriver<Tuple2<String, Integer>, Tuple2<String, Integer>> driver = new GroupReduceDriver<Tuple2<String, Integer>, Tuple2<String, Integer>>();
			driver.setup(context);
			driver.prepare();
			driver.run();
			
			Assert.assertTrue(result.getList().isEmpty());
		}
		catch (Exception e) {
			System.err.println(e.getMessage());
			e.printStackTrace();
			Assert.fail(e.getMessage());
		}
	}
	
	@Test
	public void testAllReduceDriverImmutable() {
		try {
			TestTaskContext<GroupReduceFunction<Tuple2<String, Integer>, Tuple2<String, Integer>>, Tuple2<String, Integer>> context =
					new TestTaskContext<GroupReduceFunction<Tuple2<String, Integer>, Tuple2<String, Integer>>, Tuple2<String,Integer>>();
			
			List<Tuple2<String, Integer>> data = DriverTestData.createReduceImmutableData();
			TupleTypeInfo<Tuple2<String, Integer>> typeInfo = (TupleTypeInfo<Tuple2<String, Integer>>) TypeExtractor.getForObject(data.get(0));
			MutableObjectIterator<Tuple2<String, Integer>> input = new RegularToMutableObjectIterator<Tuple2<String, Integer>>(data.iterator(), typeInfo.createSerializer(new ExecutionConfig()));
			TypeComparator<Tuple2<String, Integer>> comparator = typeInfo.createComparator(new int[]{0}, new boolean[] {true}, 0, new ExecutionConfig());
			
			GatheringCollector<Tuple2<String, Integer>> result = new GatheringCollector<Tuple2<String,Integer>>(typeInfo.createSerializer(new ExecutionConfig()));
			
			context.setDriverStrategy(DriverStrategy.SORTED_GROUP_REDUCE);
			context.setInput1(input, typeInfo.createSerializer(new ExecutionConfig()));
			context.setCollector(result);
			context.setComparator1(comparator);
			context.setUdf(new ConcatSumReducer());
			
			GroupReduceDriver<Tuple2<String, Integer>, Tuple2<String, Integer>> driver = new GroupReduceDriver<Tuple2<String, Integer>, Tuple2<String, Integer>>();
			driver.setup(context);
			driver.prepare();
			driver.run();
			
			Object[] res = result.getList().toArray();
			Object[] expected = DriverTestData.createReduceImmutableDataGroupedResult().toArray();
			
			DriverTestData.compareTupleArrays(expected, res);
		}
		catch (Exception e) {
			System.err.println(e.getMessage());
			e.printStackTrace();
			Assert.fail(e.getMessage());
		}
	}
	
	@Test
	public void testAllReduceDriverMutable() {
		try {
			TestTaskContext<GroupReduceFunction<Tuple2<StringValue, IntValue>, Tuple2<StringValue, IntValue>>, Tuple2<StringValue, IntValue>> context =
					new TestTaskContext<GroupReduceFunction<Tuple2<StringValue, IntValue>, Tuple2<StringValue, IntValue>>, Tuple2<StringValue, IntValue>>();
			
			List<Tuple2<StringValue, IntValue>> data = DriverTestData.createReduceMutableData();
			TupleTypeInfo<Tuple2<StringValue, IntValue>> typeInfo = (TupleTypeInfo<Tuple2<StringValue, IntValue>>) TypeExtractor.getForObject(data.get(0));
			MutableObjectIterator<Tuple2<StringValue, IntValue>> input = new RegularToMutableObjectIterator<Tuple2<StringValue, IntValue>>(data.iterator(), typeInfo.createSerializer(new ExecutionConfig()));
			TypeComparator<Tuple2<StringValue, IntValue>> comparator = typeInfo.createComparator(new int[]{0}, new boolean[] {true}, 0, new ExecutionConfig());
			
			GatheringCollector<Tuple2<StringValue, IntValue>> result = new GatheringCollector<Tuple2<StringValue, IntValue>>(typeInfo.createSerializer(new ExecutionConfig()));
			
			context.setDriverStrategy(DriverStrategy.SORTED_GROUP_REDUCE);
			context.setInput1(input, typeInfo.createSerializer(new ExecutionConfig()));
			context.setComparator1(comparator);
			context.setCollector(result);
			context.setUdf(new ConcatSumMutableReducer());
			
			GroupReduceDriver<Tuple2<StringValue, IntValue>, Tuple2<StringValue, IntValue>> driver = new GroupReduceDriver<Tuple2<StringValue, IntValue>, Tuple2<StringValue, IntValue>>();
			driver.setup(context);
			driver.prepare();
			driver.run();
			
			Object[] res = result.getList().toArray();
			Object[] expected = DriverTestData.createReduceMutableDataGroupedResult().toArray();
			
			DriverTestData.compareTupleArrays(expected, res);
		}
		catch (Exception e) {
			System.err.println(e.getMessage());
			e.printStackTrace();
			Assert.fail(e.getMessage());
		}
	}
	
	@Test
	public void testAllReduceDriverIncorrectlyAccumulatingMutable() {
		try {
			TestTaskContext<GroupReduceFunction<Tuple2<StringValue, IntValue>, Tuple2<StringValue, IntValue>>, Tuple2<StringValue, IntValue>> context =
					new TestTaskContext<GroupReduceFunction<Tuple2<StringValue, IntValue>, Tuple2<StringValue, IntValue>>, Tuple2<StringValue, IntValue>>();
			
			List<Tuple2<StringValue, IntValue>> data = DriverTestData.createReduceMutableData();
			TupleTypeInfo<Tuple2<StringValue, IntValue>> typeInfo = (TupleTypeInfo<Tuple2<StringValue, IntValue>>) TypeExtractor.getForObject(data.get(0));
			MutableObjectIterator<Tuple2<StringValue, IntValue>> input = new RegularToMutableObjectIterator<Tuple2<StringValue, IntValue>>(data.iterator(), typeInfo.createSerializer(new ExecutionConfig()));
			TypeComparator<Tuple2<StringValue, IntValue>> comparator = typeInfo.createComparator(new int[]{0}, new boolean[] {true}, 0, new ExecutionConfig());
			
			GatheringCollector<Tuple2<StringValue, IntValue>> result = new GatheringCollector<Tuple2<StringValue, IntValue>>(typeInfo.createSerializer(new ExecutionConfig()));
			
			context.setDriverStrategy(DriverStrategy.SORTED_GROUP_REDUCE);
			context.setInput1(input, typeInfo.createSerializer(new ExecutionConfig()));
			context.setComparator1(comparator);
			context.setCollector(result);
			context.setUdf(new ConcatSumMutableAccumulatingReducer());
			
			GroupReduceDriver<Tuple2<StringValue, IntValue>, Tuple2<StringValue, IntValue>> driver = new GroupReduceDriver<Tuple2<StringValue, IntValue>, Tuple2<StringValue, IntValue>>();
			driver.setup(context);
			driver.prepare();
			driver.run();
			
			Object[] res = result.getList().toArray();
			Object[] expected = DriverTestData.createReduceMutableDataGroupedResult().toArray();
			
			try {
				DriverTestData.compareTupleArrays(expected, res);
				Assert.fail("Accumulationg mutable objects is expected to result in incorrect values.");
			}
			catch (AssertionError e) {
				// expected
			}
		}
		catch (Exception e) {
			System.err.println(e.getMessage());
			e.printStackTrace();
			Assert.fail(e.getMessage());
		}
	}
	
	@Test
	public void testAllReduceDriverAccumulatingImmutable() {
		try {
			TestTaskContext<GroupReduceFunction<Tuple2<StringValue, IntValue>, Tuple2<StringValue, IntValue>>, Tuple2<StringValue, IntValue>> context =
					new TestTaskContext<GroupReduceFunction<Tuple2<StringValue, IntValue>, Tuple2<StringValue, IntValue>>, Tuple2<StringValue, IntValue>>();
			
			List<Tuple2<StringValue, IntValue>> data = DriverTestData.createReduceMutableData();
			TupleTypeInfo<Tuple2<StringValue, IntValue>> typeInfo = (TupleTypeInfo<Tuple2<StringValue, IntValue>>) TypeExtractor.getForObject(data.get(0));
			MutableObjectIterator<Tuple2<StringValue, IntValue>> input = new RegularToMutableObjectIterator<Tuple2<StringValue, IntValue>>(data.iterator(), typeInfo.createSerializer(new ExecutionConfig()));
			TypeComparator<Tuple2<StringValue, IntValue>> comparator = typeInfo.createComparator(new int[]{0}, new boolean[] {true}, 0, new ExecutionConfig());
			
			GatheringCollector<Tuple2<StringValue, IntValue>> result = new GatheringCollector<Tuple2<StringValue, IntValue>>(typeInfo.createSerializer(new ExecutionConfig()));
			
			context.setDriverStrategy(DriverStrategy.SORTED_GROUP_REDUCE);
			context.setInput1(input, typeInfo.createSerializer(new ExecutionConfig()));
			context.setComparator1(comparator);
			context.setCollector(result);
			context.setUdf(new ConcatSumMutableAccumulatingReducer());
			context.setMutableObjectMode(false);
			
			GroupReduceDriver<Tuple2<StringValue, IntValue>, Tuple2<StringValue, IntValue>> driver = new GroupReduceDriver<Tuple2<StringValue, IntValue>, Tuple2<StringValue, IntValue>>();
			driver.setup(context);
			driver.prepare();
			driver.run();
			
			Object[] res = result.getList().toArray();
			Object[] expected = DriverTestData.createReduceMutableDataGroupedResult().toArray();
			
			DriverTestData.compareTupleArrays(expected, res);
		}
		catch (Exception e) {
			System.err.println(e.getMessage());
			e.printStackTrace();
			Assert.fail(e.getMessage());
		}
	}
	
	// --------------------------------------------------------------------------------------------
	//  Test UDFs
	// --------------------------------------------------------------------------------------------
	
	public static final class ConcatSumReducer extends RichGroupReduceFunction<Tuple2<String, Integer>, Tuple2<String, Integer>> {

		@Override
		public void reduce(Iterable<Tuple2<String, Integer>> values, Collector<Tuple2<String, Integer>> out) {
			Tuple2<String, Integer> current = new Tuple2<String, Integer>("", 0);
			
			for (Tuple2<String, Integer> next : values) {
				next.f0 = current.f0 + next.f0;
				next.f1 = current.f1 + next.f1;
				current = next;
			}
			
			out.collect(current);
		}
	}
	
	public static final class ConcatSumMutableReducer extends RichGroupReduceFunction<Tuple2<StringValue, IntValue>, Tuple2<StringValue, IntValue>> {

		@Override
		public void reduce(Iterable<Tuple2<StringValue, IntValue>> values, Collector<Tuple2<StringValue, IntValue>> out) {
			Tuple2<StringValue, IntValue> current = new Tuple2<StringValue, IntValue>(new StringValue(""), new IntValue(0));
			
			for (Tuple2<StringValue, IntValue> next : values) {
				next.f0.append(current.f0);
				next.f1.setValue(current.f1.getValue() + next.f1.getValue());
				current = next;
			}
			
			out.collect(current);
		}
	}
	
	public static final class ConcatSumMutableAccumulatingReducer implements GroupReduceFunction<Tuple2<StringValue, IntValue>, Tuple2<StringValue, IntValue>> {

		@Override
		public void reduce(Iterable<Tuple2<StringValue, IntValue>> values, Collector<Tuple2<StringValue, IntValue>> out) throws Exception {
			List<Tuple2<StringValue, IntValue>> all = new ArrayList<Tuple2<StringValue,IntValue>>();
			
			for (Tuple2<StringValue, IntValue> t : values) {
				all.add(t);
			}
			
			Tuple2<StringValue, IntValue> result = all.get(0);
			
			for (int i = 1; i < all.size(); i++) {
				Tuple2<StringValue, IntValue> e = all.get(i);
				result.f0.append(e.f0);
				result.f1.setValue(result.f1.getValue() + e.f1.getValue());
			}
			
			out.collect(result);
		}
	}
}