GroupingKeySelectorTranslationTest.java example

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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
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 */

package org.apache.flink.optimizer.custompartition;

import static org.junit.Assert.*;

import org.apache.flink.api.common.InvalidProgramException;
import org.apache.flink.api.common.Plan;
import org.apache.flink.api.common.functions.Partitioner;
import org.apache.flink.api.common.operators.Order;
import org.apache.flink.api.java.DataSet;
import org.apache.flink.api.java.ExecutionEnvironment;
import org.apache.flink.api.java.functions.KeySelector;
import org.apache.flink.api.java.io.DiscardingOutputFormat;
import org.apache.flink.api.java.tuple.Tuple;
import org.apache.flink.api.java.tuple.Tuple2;
import org.apache.flink.api.java.tuple.Tuple3;
import org.apache.flink.optimizer.plan.OptimizedPlan;
import org.apache.flink.optimizer.plan.SingleInputPlanNode;
import org.apache.flink.optimizer.plan.SinkPlanNode;
import org.apache.flink.optimizer.testfunctions.DummyReducer;
import org.apache.flink.optimizer.testfunctions.IdentityGroupReducerCombinable;
import org.apache.flink.optimizer.util.CompilerTestBase;
import org.apache.flink.runtime.operators.shipping.ShipStrategyType;
import org.junit.Test;

@SuppressWarnings({"serial", "unchecked"})
public class GroupingKeySelectorTranslationTest extends CompilerTestBase {
	
	@Test
	public void testCustomPartitioningKeySelectorReduce() {
		try {
			ExecutionEnvironment env = ExecutionEnvironment.getExecutionEnvironment();
			
			DataSet<Tuple2<Integer, Integer>> data = env.fromElements(new Tuple2<Integer, Integer>(0, 0))
					.rebalance().setParallelism(4);
			
			data.groupBy(new TestKeySelector<Tuple2<Integer,Integer>>())
				.withPartitioner(new TestPartitionerInt())
				.reduce(new DummyReducer<Tuple2<Integer,Integer>>())
				.output(new DiscardingOutputFormat<Tuple2<Integer, Integer>>());
			
			Plan p = env.createProgramPlan();
			OptimizedPlan op = compileNoStats(p);
			
			SinkPlanNode sink = op.getDataSinks().iterator().next();
			SingleInputPlanNode keyRemovingMapper = (SingleInputPlanNode) sink.getInput().getSource();
			SingleInputPlanNode reducer = (SingleInputPlanNode) keyRemovingMapper.getInput().getSource();
			SingleInputPlanNode combiner = (SingleInputPlanNode) reducer.getInput().getSource();
			
			assertEquals(ShipStrategyType.FORWARD, sink.getInput().getShipStrategy());
			assertEquals(ShipStrategyType.FORWARD, keyRemovingMapper.getInput().getShipStrategy());
			assertEquals(ShipStrategyType.PARTITION_CUSTOM, reducer.getInput().getShipStrategy());
			assertEquals(ShipStrategyType.FORWARD, combiner.getInput().getShipStrategy());
		}
		catch (Exception e) {
			e.printStackTrace();
			fail(e.getMessage());
		}
	}
	
	@Test
	public void testCustomPartitioningKeySelectorGroupReduce() {
		try {
			ExecutionEnvironment env = ExecutionEnvironment.getExecutionEnvironment();
			
			DataSet<Tuple2<Integer, Integer>> data = env.fromElements(new Tuple2<Integer, Integer>(0, 0))
					.rebalance().setParallelism(4);
			
			data.groupBy(new TestKeySelector<Tuple2<Integer,Integer>>())
				.withPartitioner(new TestPartitionerInt())
					.reduceGroup(new IdentityGroupReducerCombinable<Tuple2<Integer,Integer>>())
				.output(new DiscardingOutputFormat<Tuple2<Integer, Integer>>());
			
			Plan p = env.createProgramPlan();
			OptimizedPlan op = compileNoStats(p);
			
			SinkPlanNode sink = op.getDataSinks().iterator().next();
			SingleInputPlanNode reducer = (SingleInputPlanNode) sink.getInput().getSource();
			SingleInputPlanNode combiner = (SingleInputPlanNode) reducer.getInput().getSource();
			
			assertEquals(ShipStrategyType.FORWARD, sink.getInput().getShipStrategy());
			assertEquals(ShipStrategyType.PARTITION_CUSTOM, reducer.getInput().getShipStrategy());
			assertEquals(ShipStrategyType.FORWARD, combiner.getInput().getShipStrategy());
		}
		catch (Exception e) {
			e.printStackTrace();
			fail(e.getMessage());
		}
	}
	
	@Test
	public void testCustomPartitioningKeySelectorGroupReduceSorted() {
		try {
			ExecutionEnvironment env = ExecutionEnvironment.getExecutionEnvironment();
			
			DataSet<Tuple3<Integer, Integer, Integer>> data = env.fromElements(new Tuple3<Integer, Integer, Integer>(0, 0, 0))
					.rebalance().setParallelism(4);
			
			data.groupBy(new TestKeySelector<Tuple3<Integer,Integer,Integer>>())
				.withPartitioner(new TestPartitionerInt())
				.sortGroup(new TestKeySelector<Tuple3<Integer, Integer, Integer>>(), Order.ASCENDING)
				.reduceGroup(new IdentityGroupReducerCombinable<Tuple3<Integer,Integer,Integer>>())
				.output(new DiscardingOutputFormat<Tuple3<Integer, Integer, Integer>>());
			
			Plan p = env.createProgramPlan();
			OptimizedPlan op = compileNoStats(p);
			
			SinkPlanNode sink = op.getDataSinks().iterator().next();
			SingleInputPlanNode reducer = (SingleInputPlanNode) sink.getInput().getSource();
			SingleInputPlanNode combiner = (SingleInputPlanNode) reducer.getInput().getSource();
			
			assertEquals(ShipStrategyType.FORWARD, sink.getInput().getShipStrategy());
			assertEquals(ShipStrategyType.PARTITION_CUSTOM, reducer.getInput().getShipStrategy());
			assertEquals(ShipStrategyType.FORWARD, combiner.getInput().getShipStrategy());
		}
		catch (Exception e) {
			e.printStackTrace();
			fail(e.getMessage());
		}
	}
	
	@Test
	public void testCustomPartitioningKeySelectorInvalidType() {
		try {
			ExecutionEnvironment env = ExecutionEnvironment.getExecutionEnvironment();
			
			DataSet<Tuple2<Integer, Integer>> data = env.fromElements(new Tuple2<Integer, Integer>(0, 0))
					.rebalance().setParallelism(4);
			
			try {
				data
					.groupBy(new TestKeySelector<Tuple2<Integer,Integer>>())
					.withPartitioner(new TestPartitionerLong());
				fail("Should throw an exception");
			}
			catch (InvalidProgramException e) {}
		}
		catch (Exception e) {
			e.printStackTrace();
			fail(e.getMessage());
		}
	}
	
	@Test
	public void testCustomPartitioningKeySelectorInvalidTypeSorted() {
		try {
			ExecutionEnvironment env = ExecutionEnvironment.getExecutionEnvironment();
			
			DataSet<Tuple3<Integer, Integer, Integer>> data = env.fromElements(new Tuple3<Integer, Integer, Integer>(0, 0, 0))
					.rebalance().setParallelism(4);
			
			try {
				data
					.groupBy(new TestKeySelector<Tuple3<Integer,Integer,Integer>>())
					.sortGroup(1, Order.ASCENDING)
					.withPartitioner(new TestPartitionerLong());
				fail("Should throw an exception");
			}
			catch (InvalidProgramException e) {}
		}
		catch (Exception e) {
			e.printStackTrace();
			fail(e.getMessage());
		}
	}
	
	@Test
	public void testCustomPartitioningTupleRejectCompositeKey() {
		try {
			ExecutionEnvironment env = ExecutionEnvironment.getExecutionEnvironment();
			
			DataSet<Tuple3<Integer, Integer, Integer>> data = env.fromElements(new Tuple3<Integer, Integer, Integer>(0, 0, 0))
					.rebalance().setParallelism(4);
			
			try {
				data
					.groupBy(new TestBinaryKeySelector<Tuple3<Integer,Integer,Integer>>())
					.withPartitioner(new TestPartitionerInt());
				fail("Should throw an exception");
			}
			catch (InvalidProgramException e) {}
		}
		catch (Exception e) {
			e.printStackTrace();
			fail(e.getMessage());
		}
	}
	
	// --------------------------------------------------------------------------------------------
	
	private static class TestPartitionerInt implements Partitioner<Integer> {
		@Override
		public int partition(Integer key, int numPartitions) {
			return 0;
		}
	}
	
	private static class TestPartitionerLong implements Partitioner<Long> {
		@Override
		public int partition(Long key, int numPartitions) {
			return 0;
		}
	}
	
	private static class TestKeySelector<T extends Tuple> implements KeySelector<T, Integer> {
		@Override
		public Integer getKey(T value) {
			return value.getField(0);
		}
	}
	
	private static class TestBinaryKeySelector<T extends Tuple> implements KeySelector<T, Tuple2<Integer, Integer>> {
		@Override
		public Tuple2<Integer, Integer> getKey(T value) {
			return new Tuple2<Integer, Integer>(value.<Integer>getField(0), value.<Integer>getField(1));
		}
	}
}