test/org/apache/pig/test/TestJobControlCompiler.java - pig - Git at Google

 /*
  * 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.URI;
 import java.net.URL;
 import java.net.URLClassLoader;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.Enumeration;
 import java.util.HashMap;
 import java.util.HashSet;
 import java.util.List;
 import java.util.Map;
 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.commons.lang.StringUtils;
 import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.filecache.DistributedCache;
 import org.apache.hadoop.fs.FileSystem;
 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.PigServer;
 import org.apache.pig.backend.hadoop.executionengine.JobCreationException;
 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
    * @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
     PigServer pigServer = new PigServer(ExecType.MAPREDUCE);
     PigContext pigContext = pigServer.getPigContext();
     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);
     // guava jar is not shipped with Hadoop 2.x
     Assert.assertEquals("size for "+Arrays.toString(fileClassPaths), 5, 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));
   }

     private static List<File> createFiles(String... extensions)
             throws IOException {
         List<File> files = new ArrayList<File>();
         for (String extension : extensions) {
             File file = File.createTempFile("file", extension);
             file.deleteOnExit();
             files.add(file);
         }
         return files;
     }

     private static void assertFilesInDistributedCache(URI[] uris, int size,
             String... extensions) {
         Assert.assertEquals(size, uris.length);
         for (int i = 0; i < uris.length; i++) {
             Assert.assertTrue(uris[i].toString().endsWith(extensions[i]));
         }
     }

     @Test
     public void testAddArchiveToDistributedCache() throws IOException {
         final File textFile = File.createTempFile("file", ".txt");
         textFile.deleteOnExit();

         final List<File> zipArchives = createFiles(".zip");
         zipArchives.add(textFile);
         final List<File> tarArchives = createFiles(".tgz", ".tar.gz", ".tar");

         final PigServer pigServer = new PigServer(ExecType.MAPREDUCE);
         final PigContext pigContext = pigServer.getPigContext();
         pigContext.connect();
         pigContext.getProperties().put("pig.streaming.ship.files",
                 StringUtils.join(zipArchives, ","));
         pigContext.getProperties().put("pig.streaming.cache.files",
                 StringUtils.join(tarArchives, ","));

         final JobConf jobConf = compileTestJob(pigContext, CONF);

         URI[] uris = DistributedCache.getCacheFiles(jobConf);
         int sizeTxt = 0;
         for (int i = 0; i < uris.length; i++) {
             if (uris[i].toString().endsWith(".txt")) {
                 sizeTxt++;
             }
         }
         Assert.assertTrue(sizeTxt == 1);
         assertFilesInDistributedCache(
                 DistributedCache.getCacheArchives(jobConf), 4, ".zip", ".tgz",
                 ".tar.gz", ".tar");
     }

     private JobConf compileTestJob(final PigContext pigContext, Configuration conf)
             throws JobCreationException {
         final JobControlCompiler jobControlCompiler = new JobControlCompiler(
                 pigContext, conf);

         final MROperPlan plan = new MROperPlan();
         plan.add(new MapReduceOper(new OperatorKey()));

         final JobControl jobControl = jobControlCompiler.compile(plan, "test");
         final JobConf jobConf = jobControl.getWaitingJobs().get(0).getJobConf();
         return jobConf;
     }

     /**
      * Tests that no duplicate jars are added to distributed cache, which might cause conflicts
      * and tests with both symlinked and normal jar specification
      */
       @Test
       public void testNoDuplicateJarsInDistributedCache() throws Exception {

           // JobControlCompiler setup
           final PigServer pigServer = new PigServer(ExecType.MAPREDUCE);
           PigContext pigContext = pigServer.getPigContext();
           pigContext.connect();

           Configuration conf = new Configuration();
           DistributedCache.addFileToClassPath(new Path(new URI("/lib/udf-0.jar#udf.jar")), conf, FileSystem.get(conf));
           DistributedCache.addFileToClassPath(new Path(new URI("/lib/udf1.jar#diffname.jar")), conf, FileSystem.get(conf));
           DistributedCache.addFileToClassPath(new Path(new URI("/lib/udf2.jar")), conf, FileSystem.get(conf));
           createAndAddResource("udf.jar", pigContext);
           createAndAddResource("udf1.jar", pigContext);
           createAndAddResource("udf2.jar", pigContext);
           createAndAddResource("another.jar", pigContext);

           final JobConf jobConf = compileTestJob(pigContext, conf);

           // verifying the jar gets on distributed cache
           URI[] cacheURIs = DistributedCache.getCacheFiles(jobConf);
           Path[] fileClassPaths = DistributedCache.getFileClassPaths(jobConf);
           // expected - 1. udf.jar#udf.jar, 2. udf1.jar#diffname.jar 3. udf2.jar (same added twice)
           // 4. another.jar and 5. udf1.jar, and not duplicate udf.jar
           System.out.println("cache.files= " + Arrays.toString(cacheURIs));
           System.out.println("classpath.files= " + Arrays.toString(fileClassPaths));
           // Default jars - 5 (pig, antlr, joda-time, automaton)
           // Other jars - 10 (udf.jar#udf.jar, udf1.jar#diffname.jar, udf2.jar, udf1.jar, another.jar
           Assert.assertEquals("size 9 for " + Arrays.toString(cacheURIs), 9,
                   Arrays.asList(StringUtils.join(cacheURIs, ",").split(",")).size());
           Assert.assertEquals("size 9 for " + Arrays.toString(fileClassPaths), 9,
                   Arrays.asList(StringUtils.join(fileClassPaths, ",").split(",")).size());
           // Count occurrences of the resources
           Map<String, Integer> occurrences = new HashMap<String, Integer>();

           for (URI cacheURI : cacheURIs) {
               Integer val = occurrences.get(cacheURI.toString());
               val = (val == null) ? 1 : ++val;
               occurrences.put(cacheURI.toString(), val);
           }
           Assert.assertEquals(9, occurrences.size());

           for (String file : occurrences.keySet()) {
               // check that only single occurrence even though we added once to dist cache (simulating via Oozie)
               // and second time through pig register jar when there is symlink
               Assert.assertEquals("One occurrence for " + file, 1, (int) occurrences.get(file));
           }
       }

       private File createAndAddResource(String name, PigContext pigContext) throws IOException {
           File f = new File(name);
           f.createNewFile();
           f.deleteOnExit();
           pigContext.addJar(name);
           return f;
       }

     @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);
         f.close();

         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;
   }
 }
	/*
	* 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.URI;
	import java.net.URL;
	import java.net.URLClassLoader;
	import java.util.ArrayList;
	import java.util.Arrays;
	import java.util.Enumeration;
	import java.util.HashMap;
	import java.util.HashSet;
	import java.util.List;
	import java.util.Map;
	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.commons.lang.StringUtils;
	import org.apache.hadoop.conf.Configuration;
	import org.apache.hadoop.filecache.DistributedCache;
	import org.apache.hadoop.fs.FileSystem;
	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.PigServer;
	import org.apache.pig.backend.hadoop.executionengine.JobCreationException;
	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
	* @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
	PigServer pigServer = new PigServer(ExecType.MAPREDUCE);
	PigContext pigContext = pigServer.getPigContext();
	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);
	// guava jar is not shipped with Hadoop 2.x
	Assert.assertEquals("size for "+Arrays.toString(fileClassPaths), 5, 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));
	}

	private static List<File> createFiles(String... extensions)
	throws IOException {
	List<File> files = new ArrayList<File>();
	for (String extension : extensions) {
	File file = File.createTempFile("file", extension);
	file.deleteOnExit();
	files.add(file);
	}
	return files;
	}

	private static void assertFilesInDistributedCache(URI[] uris, int size,
	String... extensions) {
	Assert.assertEquals(size, uris.length);
	for (int i = 0; i < uris.length; i++) {
	Assert.assertTrue(uris[i].toString().endsWith(extensions[i]));
	}
	}

	@Test
	public void testAddArchiveToDistributedCache() throws IOException {
	final File textFile = File.createTempFile("file", ".txt");
	textFile.deleteOnExit();

	final List<File> zipArchives = createFiles(".zip");
	zipArchives.add(textFile);
	final List<File> tarArchives = createFiles(".tgz", ".tar.gz", ".tar");

	final PigServer pigServer = new PigServer(ExecType.MAPREDUCE);
	final PigContext pigContext = pigServer.getPigContext();
	pigContext.connect();
	pigContext.getProperties().put("pig.streaming.ship.files",
	StringUtils.join(zipArchives, ","));
	pigContext.getProperties().put("pig.streaming.cache.files",
	StringUtils.join(tarArchives, ","));

	final JobConf jobConf = compileTestJob(pigContext, CONF);

	URI[] uris = DistributedCache.getCacheFiles(jobConf);
	int sizeTxt = 0;
	for (int i = 0; i < uris.length; i++) {
	if (uris[i].toString().endsWith(".txt")) {
	sizeTxt++;
	}
	}
	Assert.assertTrue(sizeTxt == 1);
	assertFilesInDistributedCache(
	DistributedCache.getCacheArchives(jobConf), 4, ".zip", ".tgz",
	".tar.gz", ".tar");
	}

	private JobConf compileTestJob(final PigContext pigContext, Configuration conf)
	throws JobCreationException {
	final JobControlCompiler jobControlCompiler = new JobControlCompiler(
	pigContext, conf);

	final MROperPlan plan = new MROperPlan();
	plan.add(new MapReduceOper(new OperatorKey()));

	final JobControl jobControl = jobControlCompiler.compile(plan, "test");
	final JobConf jobConf = jobControl.getWaitingJobs().get(0).getJobConf();
	return jobConf;
	}

	/**
	* Tests that no duplicate jars are added to distributed cache, which might cause conflicts
	* and tests with both symlinked and normal jar specification
	*/
	@Test
	public void testNoDuplicateJarsInDistributedCache() throws Exception {

	// JobControlCompiler setup
	final PigServer pigServer = new PigServer(ExecType.MAPREDUCE);
	PigContext pigContext = pigServer.getPigContext();
	pigContext.connect();

	Configuration conf = new Configuration();
	DistributedCache.addFileToClassPath(new Path(new URI("/lib/udf-0.jar#udf.jar")), conf, FileSystem.get(conf));
	DistributedCache.addFileToClassPath(new Path(new URI("/lib/udf1.jar#diffname.jar")), conf, FileSystem.get(conf));
	DistributedCache.addFileToClassPath(new Path(new URI("/lib/udf2.jar")), conf, FileSystem.get(conf));
	createAndAddResource("udf.jar", pigContext);
	createAndAddResource("udf1.jar", pigContext);
	createAndAddResource("udf2.jar", pigContext);
	createAndAddResource("another.jar", pigContext);

	final JobConf jobConf = compileTestJob(pigContext, conf);

	// verifying the jar gets on distributed cache
	URI[] cacheURIs = DistributedCache.getCacheFiles(jobConf);
	Path[] fileClassPaths = DistributedCache.getFileClassPaths(jobConf);
	// expected - 1. udf.jar#udf.jar, 2. udf1.jar#diffname.jar 3. udf2.jar (same added twice)
	// 4. another.jar and 5. udf1.jar, and not duplicate udf.jar
	System.out.println("cache.files= " + Arrays.toString(cacheURIs));
	System.out.println("classpath.files= " + Arrays.toString(fileClassPaths));
	// Default jars - 5 (pig, antlr, joda-time, automaton)
	// Other jars - 10 (udf.jar#udf.jar, udf1.jar#diffname.jar, udf2.jar, udf1.jar, another.jar
	Assert.assertEquals("size 9 for " + Arrays.toString(cacheURIs), 9,
	Arrays.asList(StringUtils.join(cacheURIs, ",").split(",")).size());
	Assert.assertEquals("size 9 for " + Arrays.toString(fileClassPaths), 9,
	Arrays.asList(StringUtils.join(fileClassPaths, ",").split(",")).size());
	// Count occurrences of the resources
	Map<String, Integer> occurrences = new HashMap<String, Integer>();

	for (URI cacheURI : cacheURIs) {
	Integer val = occurrences.get(cacheURI.toString());
	val = (val == null) ? 1 : ++val;
	occurrences.put(cacheURI.toString(), val);
	}
	Assert.assertEquals(9, occurrences.size());

	for (String file : occurrences.keySet()) {
	// check that only single occurrence even though we added once to dist cache (simulating via Oozie)
	// and second time through pig register jar when there is symlink
	Assert.assertEquals("One occurrence for " + file, 1, (int) occurrences.get(file));
	}
	}

	private File createAndAddResource(String name, PigContext pigContext) throws IOException {
	File f = new File(name);
	f.createNewFile();
	f.deleteOnExit();
	pigContext.addJar(name);
	return f;
	}

	@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);
	f.close();

	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;
	}
	}