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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.flink.test.accumulators;
import java.io.Serializable;
import java.util.Collection;
import java.util.Iterator;
import org.apache.flink.api.common.Plan;
import org.apache.flink.api.common.accumulators.IntCounter;
import org.apache.flink.api.java.record.functions.ReduceFunction;
import org.apache.flink.api.java.record.io.CsvOutputFormat;
import org.apache.flink.api.java.record.io.TextInputFormat;
import org.apache.flink.api.java.record.operators.BulkIteration;
import org.apache.flink.api.java.record.operators.FileDataSink;
import org.apache.flink.api.java.record.operators.FileDataSource;
import org.apache.flink.api.java.record.operators.ReduceOperator;
import org.apache.flink.configuration.Configuration;
import org.apache.flink.test.util.RecordAPITestBase;
import org.apache.flink.types.Record;
import org.apache.flink.types.StringValue;
import org.apache.flink.util.Collector;
import org.junit.Assert;
import org.junit.runner.RunWith;
import org.junit.runners.Parameterized;
import org.junit.runners.Parameterized.Parameters;
/**
* To be finished !!! Didn't test with iterations yet;-(
*/
@SuppressWarnings("deprecation")
@RunWith(Parameterized.class)
public class AccumulatorIterativeITCase extends RecordAPITestBase {
private static final String INPUT = "1\n" + "2\n" + "3\n";
private static final String EXPECTED = "6\n";
private static final int NUM_ITERATIONS = 3;
private static final int NUM_SUBTASKS = 1;
protected String dataPath;
protected String resultPath;
public AccumulatorIterativeITCase(Configuration config) {
super(config);
}
@Override
protected void preSubmit() throws Exception {
dataPath = createTempFile("datapoints.txt", INPUT);
resultPath = getTempFilePath("result");
}
@Override
protected void postSubmit() throws Exception {
compareResultsByLinesInMemory(EXPECTED, resultPath);
Integer res = (Integer) getJobExecutionResult().getAccumulatorResult("test");
Assert.assertEquals(new Integer(NUM_ITERATIONS * 6), res);
}
@Override
protected Plan getTestJob() {
Plan plan = getTestPlanPlan(config.getInteger("IterationAllReducer#NoSubtasks", 1), dataPath, resultPath);
return plan;
}
@Parameters
public static Collection<Object[]> getConfigurations() {
Configuration config1 = new Configuration();
config1.setInteger("IterationAllReducer#NoSubtasks", NUM_SUBTASKS);
return toParameterList(config1);
}
static Plan getTestPlanPlan(int numSubTasks, String input, String output) {
FileDataSource initialInput = new FileDataSource(TextInputFormat.class, input, "input");
BulkIteration iteration = new BulkIteration("Loop");
iteration.setInput(initialInput);
iteration.setMaximumNumberOfIterations(NUM_ITERATIONS);
ReduceOperator sumReduce = ReduceOperator.builder(new SumReducer())
.input(iteration.getPartialSolution())
.name("Compute sum (Reduce)")
.build();
iteration.setNextPartialSolution(sumReduce);
@SuppressWarnings("unchecked")
FileDataSink finalResult = new FileDataSink(new CsvOutputFormat("\n", " ", StringValue.class), output, iteration, "Output");
Plan plan = new Plan(finalResult, "Iteration with AllReducer (keyless Reducer)");
plan.setDefaultParallelism(numSubTasks);
return plan;
}
static final class SumReducer extends ReduceFunction implements Serializable {
private static final long serialVersionUID = 1L;
private IntCounter testCounter = new IntCounter();
@Override
public void open(Configuration parameters) throws Exception {
super.open(parameters);
getRuntimeContext().addAccumulator("test", this.testCounter);
}
@Override
public void reduce(Iterator<Record> records, Collector<Record> out) {
// Compute the sum
int sum = 0;
while (records.hasNext()) {
Record r = records.next();
Integer value = Integer.parseInt(r.getField(0, StringValue.class).getValue());
sum += value;
testCounter.add(value);
}
out.collect(new Record(new StringValue(Integer.toString(sum))));
}
}
}