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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.assertEquals;
import static org.junit.Assert.assertTrue;
import java.io.File;
import java.io.FileWriter;
import java.io.PrintWriter;
import org.apache.hadoop.fs.FileStatus;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.pig.PigRunner;
import org.apache.pig.tools.pigstats.JobStats;
import org.apache.pig.tools.pigstats.PigStats;
import org.apache.pig.tools.pigstats.mapreduce.MRJobStats;
import org.junit.AfterClass;
import org.junit.BeforeClass;
import org.junit.Test;
public class TestEmptyInputDir {
private static MiniCluster cluster;
private static final String EMPTY_DIR = "emptydir";
private static final String INPUT_FILE = "input";
private static final String OUTPUT_FILE = "output";
private static final String PIG_FILE = "test.pig";
@BeforeClass
public static void setUpBeforeClass() throws Exception {
cluster = MiniCluster.buildCluster();
FileSystem fs = cluster.getFileSystem();
if (!fs.mkdirs(new Path(EMPTY_DIR))) {
throw new Exception("failed to create empty dir");
}
PrintWriter w = new PrintWriter(new FileWriter(INPUT_FILE));
w.println("1\t2");
w.println("5\t3");
w.close();
Util.copyFromLocalToCluster(cluster, INPUT_FILE, INPUT_FILE);
new File(INPUT_FILE).delete();
}
@AfterClass
public static void tearDownAfterClass() throws Exception {
cluster.shutDown();
}
@Test
public void testSkewedJoin() throws Exception {
PrintWriter w = new PrintWriter(new FileWriter(PIG_FILE));
w.println("A = load '" + INPUT_FILE + "';");
w.println("B = load '" + EMPTY_DIR + "';");
w.println("C = join B by $0, A by $0 using 'skewed';");
w.println("store C into '" + OUTPUT_FILE + "';");
w.close();
try {
String[] args = { PIG_FILE };
PigStats stats = PigRunner.run(args, null);
assertTrue(stats.isSuccessful());
// the sampler job has zero maps
MRJobStats js = (MRJobStats)stats.getJobGraph().getSources().get(0);
// This assert fails on 205 due to MAPREDUCE-3606
if (!Util.isHadoop205()&&!Util.isHadoop1_x())
assertEquals(0, js.getNumberMaps());
FileSystem fs = cluster.getFileSystem();
FileStatus status = fs.getFileStatus(new Path(OUTPUT_FILE));
assertTrue(status.isDir());
assertEquals(0, status.getLen());
// output directory isn't empty
assertTrue(fs.listStatus(status.getPath()).length > 0);
} finally {
new File(PIG_FILE).delete();
Util.deleteFile(cluster, OUTPUT_FILE);
}
}
@Test
public void testMergeJoin() throws Exception {
PrintWriter w = new PrintWriter(new FileWriter(PIG_FILE));
w.println("A = load '" + INPUT_FILE + "';");
w.println("B = load '" + EMPTY_DIR + "';");
w.println("C = join A by $0, B by $0 using 'merge';");
w.println("store C into '" + OUTPUT_FILE + "';");
w.close();
try {
String[] args = { PIG_FILE };
PigStats stats = PigRunner.run(args, null);
assertTrue(stats.isSuccessful());
// the indexer job has zero maps
MRJobStats js = (MRJobStats)stats.getJobGraph().getSources().get(0);
// This assert fails on 205 due to MAPREDUCE-3606
if (!Util.isHadoop205()&&!Util.isHadoop1_x())
assertEquals(0, js.getNumberMaps());
FileSystem fs = cluster.getFileSystem();
FileStatus status = fs.getFileStatus(new Path(OUTPUT_FILE));
assertTrue(status.isDir());
assertEquals(0, status.getLen());
// output directory isn't empty
assertTrue(fs.listStatus(status.getPath()).length > 0);
} finally {
new File(PIG_FILE).delete();
Util.deleteFile(cluster, OUTPUT_FILE);
}
}
@Test
public void testFRJoin() throws Exception {
PrintWriter w = new PrintWriter(new FileWriter(PIG_FILE));
w.println("A = load '" + INPUT_FILE + "';");
w.println("B = load '" + EMPTY_DIR + "';");
w.println("C = join A by $0, B by $0 using 'repl';");
w.println("store C into '" + OUTPUT_FILE + "';");
w.close();
try {
String[] args = { PIG_FILE };
PigStats stats = PigRunner.run(args, null);
assertTrue(stats.isSuccessful());
// the indexer job has zero maps
MRJobStats js = (MRJobStats)stats.getJobGraph().getSources().get(0);
// This assert fails on 205 due to MAPREDUCE-3606
if (!Util.isHadoop205()&&!Util.isHadoop1_x())
assertEquals(0, js.getNumberMaps());
FileSystem fs = cluster.getFileSystem();
FileStatus status = fs.getFileStatus(new Path(OUTPUT_FILE));
assertTrue(status.isDir());
assertEquals(0, status.getLen());
// output directory isn't empty
assertTrue(fs.listStatus(status.getPath()).length > 0);
} finally {
new File(PIG_FILE).delete();
Util.deleteFile(cluster, OUTPUT_FILE);
}
}
@Test
public void testRegularJoin() throws Exception {
PrintWriter w = new PrintWriter(new FileWriter(PIG_FILE));
w.println("A = load '" + INPUT_FILE + "';");
w.println("B = load '" + EMPTY_DIR + "';");
w.println("C = join B by $0, A by $0;");
w.println("store C into '" + OUTPUT_FILE + "';");
w.close();
try {
String[] args = { PIG_FILE };
PigStats stats = PigRunner.run(args, null);
assertTrue(stats.isSuccessful());
FileSystem fs = cluster.getFileSystem();
FileStatus status = fs.getFileStatus(new Path(OUTPUT_FILE));
assertTrue(status.isDir());
assertEquals(0, status.getLen());
// output directory isn't empty
assertTrue(fs.listStatus(status.getPath()).length > 0);
} finally {
new File(PIG_FILE).delete();
Util.deleteFile(cluster, OUTPUT_FILE);
}
}
@Test
public void testRightOuterJoin() throws Exception {
PrintWriter w = new PrintWriter(new FileWriter(PIG_FILE));
w.println("A = load '" + INPUT_FILE + "';");
w.println("B = load '" + EMPTY_DIR + "' as (x:int);");
w.println("C = join B by $0 right outer, A by $0;");
w.println("store C into '" + OUTPUT_FILE + "';");
w.close();
try {
String[] args = { PIG_FILE };
PigStats stats = PigRunner.run(args, null);
assertTrue(stats.isSuccessful());
assertEquals(2, stats.getNumberRecords(OUTPUT_FILE));
} finally {
new File(PIG_FILE).delete();
Util.deleteFile(cluster, OUTPUT_FILE);
}
}
@Test
public void testLeftOuterJoin() throws Exception {
PrintWriter w = new PrintWriter(new FileWriter(PIG_FILE));
w.println("A = load '" + INPUT_FILE + "' as (x:int);");
w.println("B = load '" + EMPTY_DIR + "' as (x:int);");
w.println("C = join B by $0 left outer, A by $0;");
w.println("store C into '" + OUTPUT_FILE + "';");
w.close();
try {
String[] args = { PIG_FILE };
PigStats stats = PigRunner.run(args, null);
assertTrue(stats.isSuccessful());
assertEquals(0, stats.getNumberRecords(OUTPUT_FILE));
} finally {
new File(PIG_FILE).delete();
Util.deleteFile(cluster, OUTPUT_FILE);
}
}
}