Java tutorial
/*********************************************************************************************************************** * Copyright (C) 2010-2013 by the Stratosphere project (http://stratosphere.eu) * * Licensed 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 eu.stratosphere.test.operators; import java.io.FileNotFoundException; import java.io.IOException; import java.io.Serializable; import java.util.Collection; import java.util.Iterator; import java.util.LinkedList; import eu.stratosphere.test.util.RecordAPITestBase; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; import org.junit.runner.RunWith; import org.junit.runners.Parameterized; import org.junit.runners.Parameterized.Parameters; import eu.stratosphere.api.common.Plan; import eu.stratosphere.api.java.record.operators.FileDataSink; import eu.stratosphere.api.java.record.operators.FileDataSource; import eu.stratosphere.api.java.record.functions.CoGroupFunction; import eu.stratosphere.api.java.record.io.DelimitedInputFormat; import eu.stratosphere.api.java.record.io.FileOutputFormat; import eu.stratosphere.api.java.record.operators.CoGroupOperator; import eu.stratosphere.compiler.PactCompiler; import eu.stratosphere.configuration.Configuration; import eu.stratosphere.types.IntValue; import eu.stratosphere.types.Record; import eu.stratosphere.types.StringValue; import eu.stratosphere.util.Collector; /** */ @RunWith(Parameterized.class) public class CoGroupITCase extends RecordAPITestBase { private static final Log LOG = LogFactory.getLog(CoGroupITCase.class); String leftInPath = null; String rightInPath = null; String resultPath = null; public CoGroupITCase(Configuration testConfig) { super(testConfig); } private static final String LEFT_IN = "1 1\n2 2\n3 3\n4 4\n1 2\n2 3\n3 4\n4 5\n" + "1 3\n2 4\n3 5\n4 6\n1 4\n2 5\n3 6\n4 7\n"; private static final String RIGHT_IN = "1 1\n2 2\n3 3\n5 1\n1 1\n2 2\n3 3\n6 1\n" + "1 1\n2 2\n2 2\n7 1\n1 1\n2 2\n2 2\n8 1\n"; private static final String RESULT = "1 6\n2 2\n3 12\n4 22\n5 -1\n6 -1\n7 -1\n8 -1\n"; @Override protected void preSubmit() throws Exception { leftInPath = createTempFile("left_in.txt", LEFT_IN); rightInPath = createTempFile("right_in.txt", RIGHT_IN); resultPath = getTempDirPath("result"); } public static class CoGroupTestInFormat extends DelimitedInputFormat { private static final long serialVersionUID = 1L; private final StringValue keyString = new StringValue(); private final StringValue valueString = new StringValue(); @Override public Record readRecord(Record target, byte[] bytes, int offset, int numBytes) { this.keyString.setValueAscii(bytes, offset, 1); this.valueString.setValueAscii(bytes, offset + 2, 1); target.setField(0, keyString); target.setField(1, valueString); LOG.debug("Read in: [" + keyString.getValue() + "," + valueString.getValue() + "]"); return target; } } public static class CoGroupOutFormat extends FileOutputFormat { private static final long serialVersionUID = 1L; private final StringBuilder buffer = new StringBuilder(); private final StringValue keyString = new StringValue(); private final IntValue valueInteger = new IntValue(); @Override public void writeRecord(Record record) throws IOException { this.buffer.setLength(0); this.buffer.append(record.getField(0, keyString).toString()); this.buffer.append(' '); this.buffer.append(record.getField(1, valueInteger).getValue()); this.buffer.append('\n'); byte[] bytes = this.buffer.toString().getBytes(); LOG.debug("Writing out: [" + keyString.toString() + "," + valueInteger.getValue() + "]"); this.stream.write(bytes); } } public static class TestCoGrouper extends CoGroupFunction implements Serializable { private static final long serialVersionUID = 1L; private StringValue keyString = new StringValue(); private StringValue valueString = new StringValue(); private Record record = new Record(); @Override public void coGroup(Iterator<Record> records1, Iterator<Record> records2, Collector<Record> out) { // TODO Auto-generated method stub int sum = 0; LOG.debug("Start iterating over input1"); while (records1.hasNext()) { record = records1.next(); keyString = record.getField(0, keyString); valueString = record.getField(1, valueString); sum += Integer.parseInt(valueString.getValue()); LOG.debug("Processed: [" + keyString.getValue() + "," + valueString.getValue() + "]"); } LOG.debug("Start iterating over input2"); while (records2.hasNext()) { record = records2.next(); keyString = record.getField(0, keyString); valueString = record.getField(1, valueString); sum -= Integer.parseInt(valueString.getValue()); LOG.debug("Processed: [" + keyString.getValue() + "," + valueString.getValue() + "]"); } record.setField(1, new IntValue(sum)); LOG.debug("Finished"); out.collect(record); } } @Override protected Plan getTestJob() { FileDataSource input_left = new FileDataSource(new CoGroupTestInFormat(), leftInPath); DelimitedInputFormat.configureDelimitedFormat(input_left).recordDelimiter('\n'); input_left.setDegreeOfParallelism(config.getInteger("CoGroupTest#NoSubtasks", 1)); FileDataSource input_right = new FileDataSource(new CoGroupTestInFormat(), rightInPath); DelimitedInputFormat.configureDelimitedFormat(input_right).recordDelimiter('\n'); input_right.setDegreeOfParallelism(config.getInteger("CoGroupTest#NoSubtasks", 1)); CoGroupOperator testCoGrouper = CoGroupOperator.builder(new TestCoGrouper(), StringValue.class, 0, 0) .build(); testCoGrouper.setDegreeOfParallelism(config.getInteger("CoGroupTest#NoSubtasks", 1)); testCoGrouper.getParameters().setString(PactCompiler.HINT_LOCAL_STRATEGY, config.getString("CoGroupTest#LocalStrategy", "")); testCoGrouper.getParameters().setString(PactCompiler.HINT_SHIP_STRATEGY, config.getString("CoGroupTest#ShipStrategy", "")); FileDataSink output = new FileDataSink(new CoGroupOutFormat(), resultPath); output.setDegreeOfParallelism(1); output.setInput(testCoGrouper); testCoGrouper.setFirstInput(input_left); testCoGrouper.setSecondInput(input_right); return new Plan(output); } @Override protected void postSubmit() throws Exception { compareResultsByLinesInMemory(RESULT, resultPath); } @Parameters public static Collection<Object[]> getConfigurations() throws FileNotFoundException, IOException { LinkedList<Configuration> tConfigs = new LinkedList<Configuration>(); String[] localStrategies = { PactCompiler.HINT_LOCAL_STRATEGY_SORT_BOTH_MERGE }; String[] shipStrategies = { PactCompiler.HINT_SHIP_STRATEGY_REPARTITION_HASH, }; for (String localStrategy : localStrategies) { for (String shipStrategy : shipStrategies) { Configuration config = new Configuration(); config.setString("CoGroupTest#LocalStrategy", localStrategy); config.setString("CoGroupTest#ShipStrategy", shipStrategy); config.setInteger("CoGroupTest#NoSubtasks", 4); tConfigs.add(config); } } return toParameterList(tConfigs); } }