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From sj...@apache.org
Subject hadoop git commit: YARN-4577. Enable aux services to have their own custom classpath/jar file (Xuan Gong via sale)
Date Thu, 12 May 2016 17:16:21 GMT
Repository: hadoop
Updated Branches:
  refs/heads/branch-2 389dd91dd -> d6d13ec67


YARN-4577. Enable aux services to have their own custom classpath/jar file (Xuan Gong via
sale)

(cherry picked from commit 0bbe01f8d56191edfba3b50fb9f8859a0b3f826f)


Project: http://git-wip-us.apache.org/repos/asf/hadoop/repo
Commit: http://git-wip-us.apache.org/repos/asf/hadoop/commit/d6d13ec6
Tree: http://git-wip-us.apache.org/repos/asf/hadoop/tree/d6d13ec6
Diff: http://git-wip-us.apache.org/repos/asf/hadoop/diff/d6d13ec6

Branch: refs/heads/branch-2
Commit: d6d13ec670b60db60d16fe63f7108c7e8c7fa321
Parents: 389dd91
Author: Sangjin Lee <sjlee@apache.org>
Authored: Thu May 12 10:10:01 2016 -0700
Committer: Sangjin Lee <sjlee@apache.org>
Committed: Thu May 12 10:14:24 2016 -0700

----------------------------------------------------------------------
 .../java/org/apache/hadoop/util/JarFinder.java  |  26 ++-
 .../java/org/apache/hadoop/util/TestRunJar.java |  29 +--
 .../hadoop/yarn/conf/YarnConfiguration.java     |  10 +-
 .../containermanager/AuxServices.java           |  43 ++--
 .../AuxiliaryServiceWithCustomClassLoader.java  | 201 +++++++++++++++++++
 .../containermanager/TestAuxServices.java       | 119 ++++++++++-
 6 files changed, 385 insertions(+), 43 deletions(-)
----------------------------------------------------------------------


http://git-wip-us.apache.org/repos/asf/hadoop/blob/d6d13ec6/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/util/JarFinder.java
----------------------------------------------------------------------
diff --git a/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/util/JarFinder.java
b/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/util/JarFinder.java
index 33aa025..478a29b 100644
--- a/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/util/JarFinder.java
+++ b/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/util/JarFinder.java
@@ -14,7 +14,7 @@
 package org.apache.hadoop.util;
 
 import com.google.common.base.Preconditions;
-
+import java.io.BufferedInputStream;
 import java.io.BufferedOutputStream;
 import java.io.File;
 import java.io.FileInputStream;
@@ -173,4 +173,28 @@ public class JarFinder {
     }
     return null;
   }
+
+  public static File makeClassLoaderTestJar(Class<?> target, File rootDir,
+      String jarName, int buffSize, String... clsNames) throws IOException {
+    File jarFile = new File(rootDir, jarName);
+    JarOutputStream jstream =
+        new JarOutputStream(new FileOutputStream(jarFile));
+    for (String clsName: clsNames) {
+      String name = clsName.replace('.', '/') + ".class";
+      InputStream entryInputStream = target.getResourceAsStream(
+          "/" + name);
+      ZipEntry entry = new ZipEntry(name);
+      jstream.putNextEntry(entry);
+      BufferedInputStream bufInputStream = new BufferedInputStream(
+          entryInputStream, buffSize);
+      int count;
+      byte[] data = new byte[buffSize];
+      while ((count = bufInputStream.read(data, 0, buffSize)) != -1) {
+        jstream.write(data, 0, count);
+      }
+      jstream.closeEntry();
+    }
+    jstream.close();
+    return jarFile;
+  }
 }

http://git-wip-us.apache.org/repos/asf/hadoop/blob/d6d13ec6/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/util/TestRunJar.java
----------------------------------------------------------------------
diff --git a/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/util/TestRunJar.java
b/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/util/TestRunJar.java
index 6622389..7b61b32 100644
--- a/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/util/TestRunJar.java
+++ b/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/util/TestRunJar.java
@@ -23,11 +23,9 @@ import static org.junit.Assert.assertTrue;
 import static org.mockito.Mockito.spy;
 import static org.mockito.Mockito.when;
 
-import java.io.BufferedInputStream;
 import java.io.File;
 import java.io.FileOutputStream;
 import java.io.IOException;
-import java.io.InputStream;
 import java.util.jar.JarOutputStream;
 import java.util.regex.Pattern;
 import java.util.zip.ZipEntry;
@@ -156,7 +154,8 @@ public class TestRunJar {
     when(runJar.getSystemClasses()).thenReturn(systemClasses);
 
     // create the test jar
-    File testJar = makeClassLoaderTestJar(mainCls, thirdCls);
+    File testJar = JarFinder.makeClassLoaderTestJar(this.getClass(),
+        TEST_ROOT_DIR, TEST_JAR_2_NAME, BUFF_SIZE, mainCls, thirdCls);
     // form the args
     String[] args = new String[3];
     args[0] = testJar.getAbsolutePath();
@@ -166,28 +165,4 @@ public class TestRunJar {
     runJar.run(args);
     // it should not throw an exception
   }
-
-  private File makeClassLoaderTestJar(String... clsNames) throws IOException {
-    File jarFile = new File(TEST_ROOT_DIR, TEST_JAR_2_NAME);
-    JarOutputStream jstream =
-        new JarOutputStream(new FileOutputStream(jarFile));
-    for (String clsName: clsNames) {
-      String name = clsName.replace('.', '/') + ".class";
-      InputStream entryInputStream = this.getClass().getResourceAsStream(
-          "/" + name);
-      ZipEntry entry = new ZipEntry(name);
-      jstream.putNextEntry(entry);
-      BufferedInputStream bufInputStream = new BufferedInputStream(
-          entryInputStream, BUFF_SIZE);
-      int count;
-      byte[] data = new byte[BUFF_SIZE];
-      while ((count = bufInputStream.read(data, 0, BUFF_SIZE)) != -1) {
-        jstream.write(data, 0, count);
-      }
-      jstream.closeEntry();
-    }
-    jstream.close();
-
-    return jarFile;
-  }
 }
\ No newline at end of file

http://git-wip-us.apache.org/repos/asf/hadoop/blob/d6d13ec6/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-api/src/main/java/org/apache/hadoop/yarn/conf/YarnConfiguration.java
----------------------------------------------------------------------
diff --git a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-api/src/main/java/org/apache/hadoop/yarn/conf/YarnConfiguration.java
b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-api/src/main/java/org/apache/hadoop/yarn/conf/YarnConfiguration.java
index 4099354..52355ab 100644
--- a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-api/src/main/java/org/apache/hadoop/yarn/conf/YarnConfiguration.java
+++ b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-api/src/main/java/org/apache/hadoop/yarn/conf/YarnConfiguration.java
@@ -1387,10 +1387,16 @@ public class YarnConfiguration extends Configuration {
     NM_PREFIX + "principal";
   
   public static final String NM_AUX_SERVICES = 
-    NM_PREFIX + "aux-services";
+      NM_PREFIX + "aux-services";
   
   public static final String NM_AUX_SERVICE_FMT =
-    NM_PREFIX + "aux-services.%s.class";
+      NM_PREFIX + "aux-services.%s.class";
+
+  public static final String NM_AUX_SERVICES_CLASSPATH =
+      NM_AUX_SERVICES + ".%s.classpath";
+
+  public static final String NM_AUX_SERVICES_SYSTEM_CLASSES =
+      NM_AUX_SERVICES + ".%s.system-classes";
 
   public static final String NM_USER_HOME_DIR =
       NM_PREFIX + "user-home-dir";

http://git-wip-us.apache.org/repos/asf/hadoop/blob/d6d13ec6/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/main/java/org/apache/hadoop/yarn/server/nodemanager/containermanager/AuxServices.java
----------------------------------------------------------------------
diff --git a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/main/java/org/apache/hadoop/yarn/server/nodemanager/containermanager/AuxServices.java
b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/main/java/org/apache/hadoop/yarn/server/nodemanager/containermanager/AuxServices.java
index cd5ed88..171b20d 100644
--- a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/main/java/org/apache/hadoop/yarn/server/nodemanager/containermanager/AuxServices.java
+++ b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/main/java/org/apache/hadoop/yarn/server/nodemanager/containermanager/AuxServices.java
@@ -118,21 +118,40 @@ public class AuxServices extends AbstractService
                 YarnConfiguration.NM_AUX_SERVICES +" is invalid." +
                 "The valid service name should only contain a-zA-Z0-9_ " +
                 "and can not start with numbers");
-        Class<? extends AuxiliaryService> sClass = conf.getClass(
-              String.format(YarnConfiguration.NM_AUX_SERVICE_FMT, sName), null,
-              AuxiliaryService.class);
-        if (null == sClass) {
-          throw new RuntimeException("No class defined for " + sName);
+        String classKey = String.format(
+            YarnConfiguration.NM_AUX_SERVICE_FMT, sName);
+        String className = conf.get(classKey);
+        final String appClassPath = conf.get(String.format(
+            YarnConfiguration.NM_AUX_SERVICES_CLASSPATH, sName));
+        AuxiliaryService s = null;
+        boolean useCustomerClassLoader = appClassPath != null
+            && !appClassPath.isEmpty() && className != null
+            && !className.isEmpty();
+        if (useCustomerClassLoader) {
+          s = AuxiliaryServiceWithCustomClassLoader.getInstance(
+              conf, className, appClassPath);
+          LOG.info("The aux service:" + sName
+              + " are using the custom classloader");
+        } else {
+          Class<? extends AuxiliaryService> sClass = conf.getClass(
+              classKey, null, AuxiliaryService.class);
+
+          if (sClass == null) {
+            throw new RuntimeException("No class defined for " + sName);
+          }
+          s = ReflectionUtils.newInstance(sClass, conf);
+        }
+        if (s == null) {
+          throw new RuntimeException("No object created for " + sName);
         }
-        AuxiliaryService s = ReflectionUtils.newInstance(sClass, conf);
         // TODO better use s.getName()?
         if(!sName.equals(s.getName())) {
           LOG.warn("The Auxilurary Service named '"+sName+"' in the "
-                  +"configuration is for "+sClass+" which has "
-                  +"a name of '"+s.getName()+"'. Because these are "
-                  +"not the same tools trying to send ServiceData and read "
-                  +"Service Meta Data may have issues unless the refer to "
-                  +"the name in the config.");
+              +"configuration is for "+s.getClass()+" which has "
+              +"a name of '"+s.getName()+"'. Because these are "
+              +"not the same tools trying to send ServiceData and read "
+              +"Service Meta Data may have issues unless the refer to "
+              +"the name in the config.");
         }
         addService(sName, s);
         if (recoveryEnabled) {
@@ -264,4 +283,4 @@ public class AuxServices extends AbstractService
         : "The auxService name is " + service.getName())
         + " and it got an error at event: " + eventType, th);
   }
-}
+}
\ No newline at end of file

http://git-wip-us.apache.org/repos/asf/hadoop/blob/d6d13ec6/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/main/java/org/apache/hadoop/yarn/server/nodemanager/containermanager/AuxiliaryServiceWithCustomClassLoader.java
----------------------------------------------------------------------
diff --git a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/main/java/org/apache/hadoop/yarn/server/nodemanager/containermanager/AuxiliaryServiceWithCustomClassLoader.java
b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/main/java/org/apache/hadoop/yarn/server/nodemanager/containermanager/AuxiliaryServiceWithCustomClassLoader.java
new file mode 100644
index 0000000..c764fbd
--- /dev/null
+++ b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/main/java/org/apache/hadoop/yarn/server/nodemanager/containermanager/AuxiliaryServiceWithCustomClassLoader.java
@@ -0,0 +1,201 @@
+/**
+* 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.yarn.server.nodemanager.containermanager;
+
+import java.io.IOException;
+import java.net.MalformedURLException;
+import java.nio.ByteBuffer;
+import java.security.AccessController;
+import java.security.PrivilegedActionException;
+import java.security.PrivilegedExceptionAction;
+import java.util.Arrays;
+
+import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.fs.Path;
+import org.apache.hadoop.util.ApplicationClassLoader;
+import org.apache.hadoop.util.ReflectionUtils;
+import org.apache.hadoop.yarn.conf.YarnConfiguration;
+import org.apache.hadoop.yarn.server.api.ApplicationInitializationContext;
+import org.apache.hadoop.yarn.server.api.ApplicationTerminationContext;
+import org.apache.hadoop.yarn.server.api.AuxiliaryService;
+import org.apache.hadoop.yarn.server.api.ContainerInitializationContext;
+import org.apache.hadoop.yarn.server.api.ContainerTerminationContext;
+
+final class AuxiliaryServiceWithCustomClassLoader extends AuxiliaryService {
+
+  private final AuxiliaryService wrapped;
+  private final ClassLoader customClassLoader;
+
+  private AuxiliaryServiceWithCustomClassLoader(String name,
+      AuxiliaryService wrapped, ClassLoader customClassLoader) {
+    super(name);
+    this.wrapped = wrapped;
+    this.customClassLoader = customClassLoader;
+  }
+
+  @Override
+  protected void serviceInit(Configuration conf) throws Exception {
+    // We pass a shared configuration as part of serviceInit call.
+    // To avoid the scenario that we could get a ClassNotFoundException
+    // when we use customClassLoader to load the class, we create a copy
+    // of the configuration.
+    Configuration config = new Configuration(conf);
+    // reset the service configuration
+    setConfig(config);
+    config.setClassLoader(customClassLoader);
+    ClassLoader original = Thread.currentThread().getContextClassLoader();
+    Thread.currentThread().setContextClassLoader(customClassLoader);
+    try {
+      wrapped.init(config);
+    } finally {
+      Thread.currentThread().setContextClassLoader(original);
+    }
+  }
+
+  @Override
+  protected void serviceStart() throws Exception {
+    ClassLoader original = Thread.currentThread().getContextClassLoader();
+    Thread.currentThread().setContextClassLoader(customClassLoader);
+    try {
+      wrapped.start();
+    } finally {
+      Thread.currentThread().setContextClassLoader(original);
+    }
+  }
+
+  @Override
+  protected void serviceStop() throws Exception {
+    ClassLoader original = Thread.currentThread().getContextClassLoader();
+    Thread.currentThread().setContextClassLoader(customClassLoader);
+    try {
+      wrapped.stop();
+    } finally {
+      Thread.currentThread().setContextClassLoader(original);
+    }
+  }
+
+  @Override
+  public void initializeApplication(
+      ApplicationInitializationContext initAppContext) {
+    ClassLoader original = Thread.currentThread().getContextClassLoader();
+    Thread.currentThread().setContextClassLoader(customClassLoader);
+    try {
+      wrapped.initializeApplication(initAppContext);
+    } finally {
+      Thread.currentThread().setContextClassLoader(original);
+    }
+  }
+
+  @Override
+  public void stopApplication(ApplicationTerminationContext stopAppContext) {
+    ClassLoader original = Thread.currentThread().getContextClassLoader();
+    Thread.currentThread().setContextClassLoader(customClassLoader);
+    try {
+      wrapped.stopApplication(stopAppContext);
+    } finally {
+      Thread.currentThread().setContextClassLoader(original);
+    }
+  }
+
+  @Override
+  public ByteBuffer getMetaData() {
+    ClassLoader original = Thread.currentThread().getContextClassLoader();
+    Thread.currentThread().setContextClassLoader(customClassLoader);
+    try {
+      return wrapped.getMetaData();
+    } finally {
+      Thread.currentThread().setContextClassLoader(original);
+    }
+  }
+
+  @Override
+  public void initializeContainer(ContainerInitializationContext
+      initContainerContext) {
+    ClassLoader original = Thread.currentThread().getContextClassLoader();
+    Thread.currentThread().setContextClassLoader(customClassLoader);
+    try {
+      wrapped.initializeContainer(initContainerContext);
+    } finally {
+      Thread.currentThread().setContextClassLoader(original);
+    }
+  }
+
+  @Override
+  public void stopContainer(ContainerTerminationContext stopContainerContext) {
+    ClassLoader original = Thread.currentThread().getContextClassLoader();
+    Thread.currentThread().setContextClassLoader(customClassLoader);
+    try {
+      wrapped.stopContainer(stopContainerContext);
+    } finally {
+      Thread.currentThread().setContextClassLoader(original);
+    }
+  }
+
+  @Override
+  public void setRecoveryPath(Path recoveryPath) {
+    ClassLoader original = Thread.currentThread().getContextClassLoader();
+    Thread.currentThread().setContextClassLoader(customClassLoader);
+    try {
+      wrapped.setRecoveryPath(recoveryPath);
+    } finally {
+      Thread.currentThread().setContextClassLoader(original);
+    }
+  }
+
+  public static AuxiliaryServiceWithCustomClassLoader getInstance(
+      Configuration conf, String className, String appClassPath)
+      throws IOException, ClassNotFoundException {
+    String[] systemClasses = conf.getTrimmedStrings(String.format(
+        YarnConfiguration.NM_AUX_SERVICES_SYSTEM_CLASSES,
+        className));
+    ClassLoader customClassLoader = createAuxServiceClassLoader(
+        appClassPath, systemClasses);
+    Class<?> clazz = Class.forName(className, true,
+        customClassLoader);
+    Class<? extends AuxiliaryService> sClass = clazz.asSubclass(
+        AuxiliaryService.class);
+    AuxiliaryService wrapped = ReflectionUtils.newInstance(sClass, conf);
+    return new AuxiliaryServiceWithCustomClassLoader(
+        className + " with custom class loader", wrapped,
+        customClassLoader);
+  }
+
+  private static ClassLoader createAuxServiceClassLoader(
+      final String appClasspath, final String[] systemClasses)
+      throws IOException {
+    try {
+      return AccessController.doPrivileged(
+        new PrivilegedExceptionAction<ClassLoader>() {
+          @Override
+          public ClassLoader run() throws MalformedURLException {
+            return new ApplicationClassLoader(appClasspath,
+                AuxServices.class.getClassLoader(),
+                Arrays.asList(systemClasses));
+          }
+        }
+      );
+    } catch (PrivilegedActionException e) {
+      Throwable t = e.getCause();
+      if (t instanceof MalformedURLException) {
+        throw (MalformedURLException) t;
+      }
+      throw new IOException(e);
+    }
+  }
+}
\ No newline at end of file

http://git-wip-us.apache.org/repos/asf/hadoop/blob/d6d13ec6/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/test/java/org/apache/hadoop/yarn/server/nodemanager/containermanager/TestAuxServices.java
----------------------------------------------------------------------
diff --git a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/test/java/org/apache/hadoop/yarn/server/nodemanager/containermanager/TestAuxServices.java
b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/test/java/org/apache/hadoop/yarn/server/nodemanager/containermanager/TestAuxServices.java
index 9d0d0c0..26a1003 100644
--- a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/test/java/org/apache/hadoop/yarn/server/nodemanager/containermanager/TestAuxServices.java
+++ b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/test/java/org/apache/hadoop/yarn/server/nodemanager/containermanager/TestAuxServices.java
@@ -27,13 +27,21 @@ import static org.junit.Assert.assertTrue;
 import static org.junit.Assert.fail;
 import static org.mockito.Mockito.mock;
 
+import com.google.common.base.Charsets;
+import com.google.common.collect.Sets;
 import java.io.File;
 import java.io.IOException;
+import java.net.URL;
+import java.net.URLClassLoader;
 import java.nio.ByteBuffer;
 import java.util.ArrayList;
+import java.util.Arrays;
 import java.util.Collection;
+import java.util.HashSet;
+import java.util.List;
 import java.util.Map;
-
+import java.util.Map.Entry;
+import java.util.Set;
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
 import org.apache.hadoop.conf.Configuration;
@@ -42,6 +50,10 @@ import org.apache.hadoop.fs.FileUtil;
 import org.apache.hadoop.fs.Path;
 import org.apache.hadoop.fs.permission.FsPermission;
 import org.apache.hadoop.service.Service;
+import org.apache.hadoop.test.GenericTestUtils;
+import org.apache.hadoop.util.ApplicationClassLoader;
+import org.apache.hadoop.util.JarFinder;
+import org.apache.hadoop.util.StringUtils;
 import org.apache.hadoop.yarn.api.records.ApplicationAttemptId;
 import org.apache.hadoop.yarn.api.records.ApplicationId;
 import org.apache.hadoop.yarn.api.records.ContainerId;
@@ -150,6 +162,111 @@ public class TestAuxServices {
     }
   }
 
+  // Override getMetaData() method to return current
+  // class path. This class would be used for
+  // testCustomizedAuxServiceClassPath.
+  static class ServiceC extends LightService {
+    public ServiceC() {
+      super("C", 'C', 66, ByteBuffer.wrap("C".getBytes()));
+    }
+
+    @Override
+    public ByteBuffer getMetaData() {
+      ClassLoader loader = Thread.currentThread().getContextClassLoader();
+      URL[] urls = ((URLClassLoader)loader).getURLs();
+      List<String> urlString = new ArrayList<String>();
+      for (URL url : urls) {
+        urlString.add(url.toString());
+      }
+      String joinedString = StringUtils.join(",", urlString);
+      return ByteBuffer.wrap(joinedString.getBytes());
+    }
+  }
+
+  // To verify whether we could load class from customized class path.
+  // We would use ServiceC in this test. Also create a separate jar file
+  // including ServiceC class, and add this jar to customized directory.
+  // By setting some proper configurations, we should load ServiceC class
+  // from customized class path.
+  @Test (timeout = 15000)
+  public void testCustomizedAuxServiceClassPath() throws Exception {
+    // verify that we can load AuxService Class from default Class path
+    Configuration conf = new YarnConfiguration();
+    conf.setStrings(YarnConfiguration.NM_AUX_SERVICES,
+        new String[] {"ServiceC"});
+    conf.setClass(String.format(YarnConfiguration.NM_AUX_SERVICE_FMT,
+        "ServiceC"), ServiceC.class, Service.class);
+    @SuppressWarnings("resource")
+    AuxServices aux = new AuxServices();
+    aux.init(conf);
+    aux.start();
+    Map<String, ByteBuffer> meta = aux.getMetaData();
+    String auxName = "";
+    Set<String> defaultAuxClassPath = null;
+    Assert.assertTrue(meta.size() == 1);
+    for(Entry<String, ByteBuffer> i : meta.entrySet()) {
+      auxName = i.getKey();
+      String auxClassPath = Charsets.UTF_8.decode(i.getValue()).toString();
+      defaultAuxClassPath = new HashSet<String>(Arrays.asList(StringUtils
+          .getTrimmedStrings(auxClassPath)));
+    }
+    Assert.assertTrue(auxName.equals("ServiceC"));
+    aux.serviceStop();
+
+    // create a new jar file, and configure it as customized class path
+    // for this AuxService, and make sure that we could load the class
+    // from this configured customized class path
+    File rootDir = GenericTestUtils.getTestDir(getClass()
+        .getSimpleName());
+    if (!rootDir.exists()) {
+      rootDir.mkdirs();
+    }
+    File testJar = null;
+    try {
+      testJar = JarFinder.makeClassLoaderTestJar(this.getClass(), rootDir,
+          "test-runjar.jar", 2048, ServiceC.class.getName());
+      conf = new YarnConfiguration();
+      conf.setStrings(YarnConfiguration.NM_AUX_SERVICES,
+          new String[] {"ServiceC"});
+      conf.set(String.format(YarnConfiguration.NM_AUX_SERVICE_FMT, "ServiceC"),
+          ServiceC.class.getName());
+      conf.set(String.format(
+          YarnConfiguration.NM_AUX_SERVICES_CLASSPATH, "ServiceC"),
+          testJar.getAbsolutePath());
+      // remove "-org.apache.hadoop." from system classes
+      String systemClasses = "-org.apache.hadoop." + "," +
+              ApplicationClassLoader.SYSTEM_CLASSES_DEFAULT;
+      conf.set(String.format(
+          YarnConfiguration.NM_AUX_SERVICES_SYSTEM_CLASSES,
+          "ServiceC"), systemClasses);
+      aux = new AuxServices();
+      aux.init(conf);
+      aux.start();
+      meta = aux.getMetaData();
+      Assert.assertTrue(meta.size() == 1);
+      Set<String> customizedAuxClassPath = null;
+      for(Entry<String, ByteBuffer> i : meta.entrySet()) {
+        Assert.assertTrue(auxName.equals(i.getKey()));
+        String classPath = Charsets.UTF_8.decode(i.getValue()).toString();
+        customizedAuxClassPath = new HashSet<String>(Arrays.asList(StringUtils
+            .getTrimmedStrings(classPath)));
+        Assert.assertTrue(classPath.contains(testJar.getName()));
+      }
+      aux.stop();
+
+      // Verify that we do not have any overlap between customized class path
+      // and the default class path.
+      Set<String> mutalClassPath = Sets.intersection(defaultAuxClassPath,
+          customizedAuxClassPath);
+      Assert.assertTrue(mutalClassPath.isEmpty());
+    } finally {
+      if (testJar != null) {
+        testJar.delete();
+        rootDir.delete();
+      }
+    }
+  }
+
   @Test
   public void testAuxEventDispatch() {
     Configuration conf = new Configuration();


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