HADOOP-9349. Confusing output when running hadoop version from one hadoop installation when HADOOP_HOME points to another. (sandyr via tucu)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1451448 13f79535-47bb-0310-9956-ffa450edef68

hadoop-common-project/hadoop-common/CHANGES.txt

@@ -400,6 +400,9 @@ Release 2.0.4-beta - UNRELEASED
     HADOOP-9230. TestUniformSizeInputFormat fails intermittently. 
     (kkambatl via tucu)
 
+    HADOOP-9349. Confusing output when running hadoop version from one hadoop 
+    installation when HADOOP_HOME points to another. (sandyr via tucu)
+
 Release 2.0.3-alpha - 2013-02-06 
 
   INCOMPATIBLE CHANGES

hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/util/ClassUtil.java

@@ -0,0 +1,60 @@
+/*
+ * 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.hadoop.util;
+
+import java.io.IOException;
+import java.net.URL;
+import java.net.URLDecoder;
+import java.util.Enumeration;
+
+import org.apache.hadoop.classification.InterfaceAudience;
+
+@InterfaceAudience.Private
+public class ClassUtil {
+  /** 
+   * Find a jar that contains a class of the same name, if any.
+   * It will return a jar file, even if that is not the first thing
+   * on the class path that has a class with the same name.
+   * 
+   * @param clazz the class to find.
+   * @return a jar file that contains the class, or null.
+   * @throws IOException
+   */
+  public static String findContainingJar(Class clazz) {
+    ClassLoader loader = clazz.getClassLoader();
+    String classFile = clazz.getName().replaceAll("\\.", "/") + ".class";
+    try {
+      for (Enumeration itr = loader.getResources(classFile);
+          itr.hasMoreElements();) {
+        URL url = (URL) itr.nextElement();
+        if ("jar".equals(url.getProtocol())) {
+          String toReturn = url.getPath();
+          if (toReturn.startsWith("file:")) {
+            toReturn = toReturn.substring("file:".length());
+          }
+          toReturn = URLDecoder.decode(toReturn, "UTF-8");
+          return toReturn.replaceAll("!.*$", "");
+        }
+      }
+    } catch (IOException e) {
+      throw new RuntimeException(e);
+    }
+    return null;
+  }
+}

hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/util/VersionInfo.java

@@ -18,6 +18,11 @@
 
 package org.apache.hadoop.util;
 
+import java.io.IOException;
+import java.net.URL;
+import java.net.URLDecoder;
+import java.util.Enumeration;
+
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
 import org.apache.hadoop.classification.InterfaceAudience;
@@ -155,5 +160,7 @@ public class VersionInfo {
     System.out.println("Subversion " + getUrl() + " -r " + getRevision());
     System.out.println("Compiled by " + getUser() + " on " + getDate());
     System.out.println("From source with checksum " + getSrcChecksum());
+    System.out.println("This command was run using " + 
+        ClassUtil.findContainingJar(VersionInfo.class));
   }
 }

hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/util/TestClassUtil.java

@@ -0,0 +1,40 @@
+/*
+ * 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.hadoop.util;
+
+import java.io.File;
+
+import junit.framework.Assert;
+
+import org.apache.log4j.Logger;
+import org.junit.Test;
+
+public class TestClassUtil {
+  @Test(timeout=1000)
+  public void testFindContainingJar() {
+    String containingJar = ClassUtil.findContainingJar(Logger.class);
+    Assert.assertNotNull("Containing jar not found for Logger", 
+        containingJar);
+    File jarFile = new File(containingJar);
+    Assert.assertTrue("Containing jar does not exist on file system", 
+        jarFile.exists());
+    Assert.assertTrue("Incorrect jar file" + containingJar,  
+        jarFile.getName().matches("log4j.+[.]jar"));
+  }
+}

hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/main/java/org/apache/hadoop/mapred/JobConf.java

@@ -50,6 +50,7 @@ import org.apache.hadoop.mapreduce.MRJobConfig;
 import org.apache.hadoop.mapreduce.filecache.DistributedCache;
 import org.apache.hadoop.mapreduce.util.ConfigUtil;
 import org.apache.hadoop.security.Credentials;
+import org.apache.hadoop.util.ClassUtil;
 import org.apache.hadoop.util.ReflectionUtils;
 import org.apache.hadoop.util.Tool;
 import org.apache.log4j.Level;
@@ -453,7 +454,7 @@ public class JobConf extends Configuration {
    * @param cls the example class.
    */
   public void setJarByClass(Class cls) {
-    String jar = findContainingJar(cls);
+    String jar = ClassUtil.findContainingJar(cls);
     if (jar != null) {
       setJar(jar);
     }   
@@ -1811,7 +1812,7 @@ public class JobConf extends Configuration {
     return 
     (int)(Math.ceil((float)getMemoryForReduceTask() / (float)slotSizePerReduce));
   }
-  
+
   /** 
    * Find a jar that contains a class of the same name, if any.
    * It will return a jar file, even if that is not the first thing
@@ -1822,35 +1823,9 @@ public class JobConf extends Configuration {
    * @throws IOException
    */
   public static String findContainingJar(Class my_class) {
-    ClassLoader loader = my_class.getClassLoader();
-    String class_file = my_class.getName().replaceAll("\\.", "/") + ".class";
-    try {
-      for(Enumeration itr = loader.getResources(class_file);
-          itr.hasMoreElements();) {
-        URL url = (URL) itr.nextElement();
-        if ("jar".equals(url.getProtocol())) {
-          String toReturn = url.getPath();
-          if (toReturn.startsWith("file:")) {
-            toReturn = toReturn.substring("file:".length());
-          }
-          // URLDecoder is a misnamed class, since it actually decodes
-          // x-www-form-urlencoded MIME type rather than actual
-          // URL encoding (which the file path has). Therefore it would
-          // decode +s to ' 's which is incorrect (spaces are actually
-          // either unencoded or encoded as "%20"). Replace +s first, so
-          // that they are kept sacred during the decoding process.
-          toReturn = toReturn.replaceAll("\\+", "%2B");
-          toReturn = URLDecoder.decode(toReturn, "UTF-8");
-          return toReturn.replaceAll("!.*$", "");
-        }
-      }
-    } catch (IOException e) {
-      throw new RuntimeException(e);
-    }
-    return null;
+    return ClassUtil.findContainingJar(my_class);
   }
 
-
   /**
    * Get the memory required to run a task of this job, in bytes. See
    * {@link #MAPRED_TASK_MAXVMEM_PROPERTY}

hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-jobclient/src/test/java/org/apache/hadoop/mapred/TestJobConf.java

@@ -27,6 +27,7 @@ import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.fs.Path;
 import org.apache.hadoop.fs.FileSystem;
 import org.apache.hadoop.fs.FileUtil;
+import org.apache.hadoop.util.ClassUtil;
 
 
 import static org.junit.Assert.*;
@@ -79,7 +80,7 @@ public class TestJobConf {
     Class clazz = Class.forName(CLASSNAME, true, cl);
     assertNotNull(clazz);
 
-    String containingJar = JobConf.findContainingJar(clazz);
+    String containingJar = ClassUtil.findContainingJar(clazz);
     assertEquals(jar.getAbsolutePath(), containingJar);
   }
 }