Java tutorial
/*********************************************************************************************************************** * * Copyright (C) 2010 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.pact.test.contracts; import java.io.FileNotFoundException; import java.io.IOException; import java.util.Collection; import java.util.Iterator; import java.util.LinkedList; 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.nephele.configuration.Configuration; import eu.stratosphere.nephele.jobgraph.JobGraph; import eu.stratosphere.pact.common.contract.FileDataSink; import eu.stratosphere.pact.common.contract.FileDataSource; import eu.stratosphere.pact.common.contract.ReduceContract; import eu.stratosphere.pact.common.io.DelimitedInputFormat; import eu.stratosphere.pact.common.plan.Plan; import eu.stratosphere.pact.common.stubs.Collector; import eu.stratosphere.pact.common.stubs.ReduceStub; import eu.stratosphere.pact.common.type.PactRecord; import eu.stratosphere.pact.common.type.base.PactInteger; import eu.stratosphere.pact.common.type.base.PactString; import eu.stratosphere.pact.compiler.DataStatistics; import eu.stratosphere.pact.compiler.PactCompiler; import eu.stratosphere.pact.compiler.plan.candidate.OptimizedPlan; import eu.stratosphere.pact.compiler.plantranslate.NepheleJobGraphGenerator; import eu.stratosphere.pact.test.contracts.io.ContractITCaseIOFormats.ContractITCaseInputFormat; import eu.stratosphere.pact.test.contracts.io.ContractITCaseIOFormats.ContractITCaseOutputFormat; import eu.stratosphere.pact.test.util.TestBase; @RunWith(Parameterized.class) public class ReduceITCase extends TestBase { private static final Log LOG = LogFactory.getLog(ReduceITCase.class); public ReduceITCase(String clusterConfig, Configuration testConfig) { super(testConfig, clusterConfig); } private static final String REDUCE_IN_1 = "1 1\n2 2\n2 8\n4 4\n4 4\n6 6\n7 7\n8 8\n"; private static final String REDUCE_IN_2 = "1 1\n2 2\n2 2\n4 4\n4 4\n6 3\n5 9\n8 8\n"; private static final String REDUCE_IN_3 = "1 1\n2 2\n2 2\n3 0\n4 4\n5 9\n7 7\n8 8\n"; private static final String REDUCE_IN_4 = "1 1\n9 1\n5 9\n4 4\n4 4\n6 6\n7 7\n8 8\n"; private static final String REDUCE_RESULT = "1 4\n2 18\n3 0\n4 28\n5 27\n6 15\n7 21\n8 32\n9 1\n"; @Override protected void preSubmit() throws Exception { String tempDir = getFilesystemProvider().getTempDirPath(); this.getFilesystemProvider().createDir(tempDir + "/reduceInput"); this.getFilesystemProvider().createFile(tempDir + "/reduceInput/reduceTest_1.txt", REDUCE_IN_1); this.getFilesystemProvider().createFile(tempDir + "/reduceInput/reduceTest_2.txt", REDUCE_IN_2); this.getFilesystemProvider().createFile(tempDir + "/reduceInput/reduceTest_3.txt", REDUCE_IN_3); this.getFilesystemProvider().createFile(tempDir + "/reduceInput/reduceTest_4.txt", REDUCE_IN_4); } @ReduceContract.Combinable public static class TestReducer extends ReduceStub { private PactString reduceValue = new PactString(); private PactString combineValue = new PactString(); @Override public void combine(Iterator<PactRecord> records, Collector<PactRecord> out) throws Exception { int sum = 0; PactRecord record = new PactRecord(); while (records.hasNext()) { record = records.next(); combineValue = record.getField(1, combineValue); sum += Integer.parseInt(combineValue.toString()); LOG.debug("Processed: [" + record.getField(0, PactString.class).toString() + "," + combineValue.toString() + "]"); } combineValue.setValue(sum + ""); record.setField(1, combineValue); out.collect(record); } @Override public void reduce(Iterator<PactRecord> records, Collector<PactRecord> out) throws Exception { int sum = 0; PactRecord record = new PactRecord(); while (records.hasNext()) { record = records.next(); reduceValue = record.getField(1, reduceValue); sum += Integer.parseInt(reduceValue.toString()); LOG.debug("Processed: [" + record.getField(0, PactString.class).toString() + "," + reduceValue.toString() + "]"); } record.setField(1, new PactInteger(sum)); out.collect(record); } } @Override protected JobGraph getJobGraph() throws Exception { String pathPrefix = getFilesystemProvider().getURIPrefix() + getFilesystemProvider().getTempDirPath(); FileDataSource input = new FileDataSource(ContractITCaseInputFormat.class, pathPrefix + "/reduceInput"); DelimitedInputFormat.configureDelimitedFormat(input).recordDelimiter('\n'); input.setDegreeOfParallelism(config.getInteger("ReduceTest#NoSubtasks", 1)); ReduceContract testReducer = new ReduceContract.Builder(TestReducer.class, PactString.class, 0).build(); testReducer.setDegreeOfParallelism(config.getInteger("ReduceTest#NoSubtasks", 1)); testReducer.getParameters().setString(PactCompiler.HINT_LOCAL_STRATEGY, config.getString("ReduceTest#LocalStrategy", "")); testReducer.getParameters().setString(PactCompiler.HINT_SHIP_STRATEGY, config.getString("ReduceTest#ShipStrategy", "")); FileDataSink output = new FileDataSink(ContractITCaseOutputFormat.class, pathPrefix + "/result.txt"); output.setDegreeOfParallelism(1); output.addInput(testReducer); testReducer.addInput(input); Plan plan = new Plan(output); PactCompiler pc = new PactCompiler(new DataStatistics()); OptimizedPlan op = pc.compile(plan); NepheleJobGraphGenerator jgg = new NepheleJobGraphGenerator(); return jgg.compileJobGraph(op); } @Override protected void postSubmit() throws Exception { String tempDir = getFilesystemProvider().getTempDirPath(); compareResultsByLinesInMemory(REDUCE_RESULT, tempDir + "/result.txt"); getFilesystemProvider().delete(tempDir + "/result.txt", true); getFilesystemProvider().delete(tempDir + "/reduceInput", true); } @Parameters public static Collection<Object[]> getConfigurations() throws FileNotFoundException, IOException { LinkedList<Configuration> tConfigs = new LinkedList<Configuration>(); String[] localStrategies = { PactCompiler.HINT_LOCAL_STRATEGY_SORT }; String[] shipStrategies = { PactCompiler.HINT_SHIP_STRATEGY_REPARTITION_HASH }; for (String localStrategy : localStrategies) { for (String shipStrategy : shipStrategies) { Configuration config = new Configuration(); config.setString("ReduceTest#LocalStrategy", localStrategy); config.setString("ReduceTest#ShipStrategy", shipStrategy); config.setInteger("ReduceTest#NoSubtasks", 4); tConfigs.add(config); } } return toParameterList(ReduceITCase.class, tConfigs); } }