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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 static org.junit.Assert.assertTrue;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.Iterator;
import org.apache.pig.ExecType;
import org.apache.pig.PigServer;
import org.apache.pig.backend.executionengine.ExecException;
import org.apache.pig.data.BagFactory;
import org.apache.pig.data.DataBag;
import org.apache.pig.data.Tuple;
import org.apache.pig.test.utils.TestHelper;
import org.junit.After;
import org.junit.AfterClass;
import org.junit.Before;
import org.junit.Test;
public class TestJoinSmoke {
private static final String FR_INPUT_FILE = "testFrJoinInput.txt";
private static final String SKEW_INPUT_FILE1 = "SkewedJoinInput1.txt";
private static final String SKEW_INPUT_FILE2 = "SkewedJoinInput2.txt";
private static final String SKEW_INPUT_FILE5 = "SkewedJoinInput5.txt";
private PigServer pigServer;
private static MiniCluster cluster = MiniCluster.buildCluster();
private File tmpFile;
public TestJoinSmoke() throws ExecException, IOException {
pigServer = new PigServer(ExecType.MAPREDUCE, cluster.getProperties());
}
@Before
public void setUp() throws Exception {
setupFRJoin();
setupSkewJoin();
}
private void setupFRJoin() throws Exception {
int LOOP_SIZE = 2;
String[] input = new String[2 * LOOP_SIZE];
int k = 0;
for (int i = 1; i <= LOOP_SIZE; i++) {
String si = i + "";
for (int j = 1; j <= LOOP_SIZE; j++)
input[k++] = si + "\t" + j;
}
Util.createInputFile(cluster, FR_INPUT_FILE, input);
}
private void setupSkewJoin() throws IOException {
PrintWriter w = new PrintWriter(new FileWriter(SKEW_INPUT_FILE1));
int k = 0;
for (int j = 0; j < 120; j++) {
w.println("100\tapple1\taaa" + k);
k++;
w.println("200\torange1\tbbb" + k);
k++;
w.println("300\tstrawberry\tccc" + k);
k++;
}
w.close();
PrintWriter w2 = new PrintWriter(new FileWriter(SKEW_INPUT_FILE2));
w2.println("100\tapple1");
w2.println("100\tapple2");
w2.println("100\tapple2");
w2.println("200\torange1");
w2.println("200\torange2");
w2.println("300\tstrawberry");
w2.println("400\tpear");
w2.close();
// Create a file with null keys
PrintWriter w5 = new PrintWriter(new FileWriter(SKEW_INPUT_FILE5));
for (int i = 0; i < 10; i++) {
w5.println("\tapple1");
}
w5.println("100\tapple2");
for (int i = 0; i < 10; i++) {
w5.println("\torange1");
}
w5.println("\t");
w5.println("100\t");
w5.close();
Util.copyFromLocalToCluster(cluster, SKEW_INPUT_FILE1, SKEW_INPUT_FILE1);
Util.copyFromLocalToCluster(cluster, SKEW_INPUT_FILE2, SKEW_INPUT_FILE2);
Util.copyFromLocalToCluster(cluster, SKEW_INPUT_FILE5, SKEW_INPUT_FILE5);
}
@AfterClass
public static void oneTimeTearDown() throws Exception {
cluster.shutDown();
}
@After
public void tearDown() throws Exception {
Util.deleteFile(cluster, FR_INPUT_FILE);
tearDownSkewJoin();
}
private void tearDownSkewJoin() throws Exception {
new File(SKEW_INPUT_FILE1).delete();
new File(SKEW_INPUT_FILE2).delete();
new File(SKEW_INPUT_FILE5).delete();
Util.deleteDirectory(new File("skewedjoin"));
Util.deleteFile(cluster, SKEW_INPUT_FILE1);
Util.deleteFile(cluster, SKEW_INPUT_FILE2);
Util.deleteFile(cluster, SKEW_INPUT_FILE5);
}
@Test
public void testFRJoin() throws IOException {
pigServer.registerQuery("A = LOAD '" + FR_INPUT_FILE + "' as (x:int,y:int);");
pigServer.registerQuery("B = LOAD '" + FR_INPUT_FILE + "' as (x:int,y:int);");
DataBag dbfrj = BagFactory.getInstance().newDefaultBag(), dbshj = BagFactory.getInstance()
.newDefaultBag();
{
pigServer.registerQuery("C = join A by $0, B by $0 using 'replicated';");
Iterator<Tuple> iter = pigServer.openIterator("C");
while (iter.hasNext()) {
dbfrj.add(iter.next());
}
}
{
pigServer.registerQuery("C = join A by $0, B by $0;");
Iterator<Tuple> iter = pigServer.openIterator("C");
while (iter.hasNext()) {
dbshj.add(iter.next());
}
}
assertTrue(dbfrj.size() > 0);
assertTrue(dbshj.size() > 0);
assertTrue(TestHelper.compareBags(dbfrj, dbshj));
}
@Test
public void testSkewedJoinWithGroup() throws IOException {
pigServer.registerQuery("A = LOAD '" + SKEW_INPUT_FILE1 + "' as (id, name, n);");
pigServer.registerQuery("B = LOAD '" + SKEW_INPUT_FILE2 + "' as (id, name);");
pigServer.registerQuery("C = GROUP A by id;");
pigServer.registerQuery("D = GROUP B by id;");
DataBag dbfrj = BagFactory.getInstance().newDefaultBag(), dbshj = BagFactory.getInstance()
.newDefaultBag();
{
pigServer.registerQuery("E = join C by group, D by group using 'skewed' parallel 5;");
Iterator<Tuple> iter = pigServer.openIterator("E");
while (iter.hasNext()) {
dbfrj.add(iter.next());
}
}
{
pigServer.registerQuery("E = join C by group, D by group;");
Iterator<Tuple> iter = pigServer.openIterator("E");
while (iter.hasNext()) {
dbshj.add(iter.next());
}
}
assertTrue(dbfrj.size() > 0);
assertTrue(dbshj.size() > 0);
assertTrue(TestHelper.compareBags(dbfrj, dbshj));
}
@Test
public void testSkewedJoinOuter() throws IOException {
pigServer.registerQuery("A = LOAD '" + SKEW_INPUT_FILE5 + "' as (id,name);");
pigServer.registerQuery("B = LOAD '" + SKEW_INPUT_FILE5 + "' as (id,name);");
DataBag dbfrj = BagFactory.getInstance().newDefaultBag();
{
pigServer.registerQuery("C = join A by id left, B by id using 'skewed';");
Iterator<Tuple> iter = pigServer.openIterator("C");
while (iter.hasNext()) {
dbfrj.add(iter.next());
}
}
{
pigServer.registerQuery("C = join A by id right, B by id using 'skewed';");
Iterator<Tuple> iter = pigServer.openIterator("C");
while (iter.hasNext()) {
dbfrj.add(iter.next());
}
}
{
pigServer.registerQuery("C = join A by id full, B by id using 'skewed';");
Iterator<Tuple> iter = pigServer.openIterator("C");
while (iter.hasNext()) {
dbfrj.add(iter.next());
}
}
}
}