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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.pig.test;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.Map;
import java.util.Random;
import junit.framework.TestCase;
import org.apache.pig.ExecType;
import org.apache.pig.PigServer;
import org.apache.pig.backend.executionengine.ExecException;
import org.apache.pig.data.DataBag;
import org.apache.pig.impl.PigContext;
import org.apache.pig.impl.io.FileLocalizer;
import org.apache.pig.impl.logicalLayer.LogicalOperator;
import org.junit.Before;
import org.junit.Test;
public class TestExampleGenerator extends TestCase {
MiniCluster cluster = MiniCluster.buildCluster();
PigContext pigContext = new PigContext(ExecType.MAPREDUCE, cluster
.getProperties());
Random rand = new Random();
int MAX = 100;
String A, B;
{
try {
pigContext.connect();
} catch (ExecException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
@Before
public void setUp() throws Exception {
File fileA, fileB;
fileA = File.createTempFile("dataA", ".dat");
fileB = File.createTempFile("dataB", ".dat");
writeData(fileA);
writeData(fileB);
A = "'" + FileLocalizer.hadoopify(fileA.toString(), pigContext) + "'";
B = "'" + FileLocalizer.hadoopify(fileB.toString(), pigContext) + "'";
System.out.println("A : " + A + "\n" + "B : " + B);
System.out.println("Test data created.");
}
private void writeData(File dataFile) throws Exception {
// File dataFile = File.createTempFile(name, ".dat");
FileOutputStream dat = new FileOutputStream(dataFile);
Random rand = new Random();
for (int i = 0; i < MAX; i++)
dat.write((rand.nextInt(10) + "\t" + rand.nextInt(10) + "\n")
.getBytes());
dat.close();
}
@Test
public void testFilter() throws Exception {
PigServer pigserver = new PigServer(pigContext);
String query = "A = load " + A
+ " using PigStorage() as (x : int, y : int);\n";
pigserver.registerQuery(query);
query = "B = filter A by x > 10;";
pigserver.registerQuery(query);
Map<LogicalOperator, DataBag> derivedData = pigserver.getExamples("B");
assertTrue(derivedData != null);
}
@Test
public void testForeach() throws ExecException, IOException {
PigServer pigServer = new PigServer(pigContext);
pigServer.registerQuery("A = load " + A
+ " using PigStorage() as (x : int, y : int);");
pigServer.registerQuery("B = foreach A generate x + y as sum;");
Map<LogicalOperator, DataBag> derivedData = pigServer.getExamples("B");
assertTrue(derivedData != null);
}
@Test
public void testJoin() throws IOException, ExecException {
PigServer pigServer = new PigServer(pigContext);
pigServer.registerQuery("A1 = load " + A + " as (x, y);");
pigServer.registerQuery("B1 = load " + B + " as (x, y);");
pigServer.registerQuery("E = join A1 by x, B1 by x;");
Map<LogicalOperator, DataBag> derivedData = pigServer.getExamples("E");
assertTrue(derivedData != null);
}
@Test
public void testCogroupMultipleCols() throws Exception {
PigServer pigServer = new PigServer(pigContext);
pigServer.registerQuery("A = load " + A + " as (x, y);");
pigServer.registerQuery("B = load " + B + " as (x, y);");
pigServer.registerQuery("C = cogroup A by (x, y), B by (x, y);");
Map<LogicalOperator, DataBag> derivedData = pigServer.getExamples("C");
assertTrue(derivedData != null);
}
@Test
public void testCogroup() throws Exception {
PigServer pigServer = new PigServer(pigContext);
pigServer.registerQuery("A = load " + A + " as (x, y);");
pigServer.registerQuery("B = load " + B + " as (x, y);");
pigServer.registerQuery("C = cogroup A by x, B by x;");
Map<LogicalOperator, DataBag> derivedData = pigServer.getExamples("C");
assertTrue(derivedData != null);
}
@Test
public void testGroup() throws Exception {
PigServer pigServer = new PigServer(pigContext);
pigServer.registerQuery("A = load " + A.toString() + " as (x, y);");
pigServer.registerQuery("B = group A by x;");
Map<LogicalOperator, DataBag> derivedData = pigServer.getExamples("B");
assertTrue(derivedData != null);
}
@Test
public void testUnion() throws Exception {
PigServer pigServer = new PigServer(pigContext);
pigServer.registerQuery("A = load " + A.toString() + " as (x, y);");
pigServer.registerQuery("B = load " + B.toString() + " as (x, y);");
pigServer.registerQuery("C = union A, B;");
Map<LogicalOperator, DataBag> derivedData = pigServer.getExamples("C");
assertTrue(derivedData != null);
}
}