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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.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.FileWriter;
import java.io.IOException;
import java.io.InputStream;
import java.io.RandomAccessFile;
import java.net.URL;
import java.net.URLClassLoader;
import java.util.Arrays;
import java.util.Enumeration;
import java.util.HashSet;
import java.util.Properties;
import java.util.jar.JarEntry;
import java.util.jar.JarFile;
import java.util.jar.JarOutputStream;
import java.util.zip.ZipEntry;
import javax.tools.JavaCompiler;
import javax.tools.JavaCompiler.CompilationTask;
import javax.tools.JavaFileObject;
import javax.tools.StandardJavaFileManager;
import javax.tools.ToolProvider;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.filecache.DistributedCache;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.mapred.JobConf;
import org.apache.hadoop.mapred.jobcontrol.JobControl;
import org.apache.hadoop.mapreduce.Job;
import org.apache.pig.ExecType;
import org.apache.pig.FuncSpec;
import org.apache.pig.LoadFunc;
import org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.JobControlCompiler;
import org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.MapReduceOper;
import org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.plans.MROperPlan;
import org.apache.pig.backend.hadoop.executionengine.physicalLayer.relationalOperators.POLoad;
import org.apache.pig.builtin.PigStorage;
import org.apache.pig.impl.PigContext;
import org.apache.pig.impl.io.FileSpec;
import org.apache.pig.impl.plan.OperatorKey;
import org.junit.Assert;
import org.junit.BeforeClass;
import org.junit.Test;
public class TestJobControlCompiler {
private static final Configuration CONF = new Configuration();
@BeforeClass
public static void setupClass() throws Exception {
// creating a hadoop-site.xml and making it visible to Pig
// making sure it is at the same location as for other tests to not pick
// up a conf from a previous test
File conf_dir = new File("build/classes");
File hadoopSite = new File(conf_dir, "hadoop-site.xml");
hadoopSite.deleteOnExit();
FileWriter fw = new FileWriter(hadoopSite);
try {
fw.write("<?xml version=\"1.0\"?>\n");
fw.write("<?xml-stylesheet type=\"text/xsl\" href=\"nutch-conf.xsl\"?>\n");
fw.write("<configuration>\n");
fw.write("</configuration>\n");
} finally {
fw.close();
}
// making hadoop-site.xml visible to Pig as it REQUIRES!!! one when
// running in mapred mode
Thread.currentThread().setContextClassLoader(
new URLClassLoader(new URL[] { conf_dir.toURI().toURL() }));
}
/**
* specifically tests that REGISTERED jars get added to distributed cache instead of merged into
* the job jar
* @throws Exception
*/
@Test
public void testJarAddedToDistributedCache() throws Exception {
// creating a jar with a UDF *not* in the current classloader
File tmpFile = File.createTempFile("Some_", ".jar");
tmpFile.deleteOnExit();
String className = createTestJar(tmpFile);
final String testUDFFileName = className+".class";
// JobControlCompiler setup
PigContext pigContext = new PigContext(ExecType.MAPREDUCE, new Properties());
pigContext.connect();
pigContext.addJar(tmpFile.getAbsolutePath());
JobControlCompiler jobControlCompiler = new JobControlCompiler(pigContext, CONF);
MROperPlan plan = new MROperPlan();
MapReduceOper mro = new MapReduceOper(new OperatorKey());
mro.UDFs = new HashSet<String>();
mro.UDFs.add(className+"()");
plan.add(mro);
// compiling the job
JobControl jobControl = jobControlCompiler.compile(plan , "test");
JobConf jobConf = jobControl.getWaitingJobs().get(0).getJobConf();
// verifying the jar gets on distributed cache
Path[] fileClassPaths = DistributedCache.getFileClassPaths(jobConf);
Assert.assertEquals("size 1 for "+Arrays.toString(fileClassPaths), 1, fileClassPaths.length);
Path distributedCachePath = fileClassPaths[0];
Assert.assertEquals("ends with jar name: "+distributedCachePath, distributedCachePath.getName(), tmpFile.getName());
// hadoop bug requires path to not contain hdfs://hotname in front
Assert.assertTrue("starts with /: "+distributedCachePath,
distributedCachePath.toString().startsWith("/"));
Assert.assertTrue("jar pushed to distributed cache should contain testUDF",
jarContainsFileNamed(new File(fileClassPaths[0].toUri().getPath()), testUDFFileName));
// verifying the job jar does not contain the UDF
// jobConf.writeXml(System.out);
File submitJarFile = new File(jobConf.get("mapred.jar"));
Assert.assertFalse("the mapred.jar should *not* contain the testUDF", jarContainsFileNamed(submitJarFile, testUDFFileName));
}
@Test
public void testEstimateNumberOfReducers() throws Exception {
Assert.assertEquals(2, JobControlCompiler.estimateNumberOfReducers(
new Job(CONF), createMockPOLoadMapReduceOper(2L * 1000 * 1000 * 999)));
Assert.assertEquals(2, JobControlCompiler.estimateNumberOfReducers(
new Job(CONF), createMockPOLoadMapReduceOper(2L * 1000 * 1000 * 1000)));
Assert.assertEquals(3, JobControlCompiler.estimateNumberOfReducers(
new Job(CONF), createMockPOLoadMapReduceOper(2L * 1000 * 1000 * 1001)));
}
private static MapReduceOper createMockPOLoadMapReduceOper(long size) throws Exception {
MapReduceOper mro = new MapReduceOper(new OperatorKey());
mro.mapPlan.add(createPOLoadWithSize(size, new PigStorage()));
return mro;
}
public static POLoad createPOLoadWithSize(long size, LoadFunc loadFunc) throws Exception {
File file = File.createTempFile("tempFile", ".tmp");
file.deleteOnExit();
RandomAccessFile f = new RandomAccessFile(file, "rw");
f.setLength(size);
loadFunc.setLocation(file.getAbsolutePath(), new org.apache.hadoop.mapreduce.Job(CONF));
FuncSpec funcSpec = new FuncSpec(loadFunc.getClass().getCanonicalName());
POLoad poLoad = new POLoad(new OperatorKey(), loadFunc);
poLoad.setLFile(new FileSpec(file.getAbsolutePath(), funcSpec));
poLoad.setPc(new PigContext());
poLoad.setUp();
return poLoad;
}
/**
* checks if the given file name is in the jar
* @param jarFile the jar to check
* @param name the name to find (full path in the jar)
* @return true if the name was found
* @throws IOException
*/
private boolean jarContainsFileNamed(File jarFile, String name) throws IOException {
Enumeration<JarEntry> entries = new JarFile(jarFile).entries();
while (entries.hasMoreElements()) {
JarEntry entry = entries.nextElement();
if (entry.getName().equals(name)) {
return true;
}
}
return false;
}
/**
* creates a jar containing a UDF not in the current classloader
* @param jarFile the jar to create
* @return the name of the class created (in the default package)
* @throws IOException
* @throws FileNotFoundException
*/
private String createTestJar(File jarFile) throws IOException, FileNotFoundException {
// creating the source .java file
File javaFile = File.createTempFile("TestUDF", ".java");
javaFile.deleteOnExit();
String className = javaFile.getName().substring(0, javaFile.getName().lastIndexOf('.'));
FileWriter fw = new FileWriter(javaFile);
try {
fw.write("import org.apache.pig.EvalFunc;\n");
fw.write("import org.apache.pig.data.Tuple;\n");
fw.write("import java.io.IOException;\n");
fw.write("public class "+className+" extends EvalFunc<String> {\n");
fw.write(" public String exec(Tuple input) throws IOException {\n");
fw.write(" return \"test\";\n");
fw.write(" }\n");
fw.write("}\n");
} finally {
fw.close();
}
// compiling it
JavaCompiler compiler = ToolProvider.getSystemJavaCompiler();
StandardJavaFileManager fileManager = compiler.getStandardFileManager(null, null, null);
Iterable<? extends JavaFileObject> compilationUnits1 = fileManager.getJavaFileObjects(javaFile);
CompilationTask task = compiler.getTask(null, fileManager, null, null, null, compilationUnits1);
task.call();
// here is the compiled file
File classFile = new File(javaFile.getParentFile(), className+".class");
Assert.assertTrue(classFile.exists());
// putting it in the jar
JarOutputStream jos = new JarOutputStream(new FileOutputStream(jarFile));
try {
jos.putNextEntry(new ZipEntry(classFile.getName()));
try {
InputStream testClassContentIS = new FileInputStream(classFile);
try {
byte[] buffer = new byte[64000];
int n;
while ((n = testClassContentIS.read(buffer)) != -1) {
jos.write(buffer, 0, n);
}
} finally {
testClassContentIS.close();
}
}finally {
jos.closeEntry();
}
} finally {
jos.close();
}
return className;
}
}