HADOOP-6120. Add support for Avro specific and reflect data. Contributed by sharad.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@797197 13f79535-47bb-0310-9956-ffa450edef68

CHANGES.txt

@@ -152,6 +152,9 @@ Trunk (unreleased changes)
     HADOOP-5976. Add a new command, classpath, to the hadoop script.  (Owen
     O'Malley and Gary Murry via szetszwo)
 
+    HADOOP-6120. Add support for Avro specific and reflect data.
+    (sharad via cutting)
+
   IMPROVEMENTS
 
     HADOOP-4565. Added CombineFileInputFormat to use data locality information

build.xml

@@ -416,11 +416,22 @@
 	         includes="**/*.jr" />
     </recordcc>
   </target>
-  
+
+  <target name="generate-avro-records" depends="init, ivy-retrieve-test">
+    <taskdef name="schema" classname="org.apache.avro.specific.SchemaTask">
+      <classpath refid="test.core.classpath"/>
+    </taskdef>
+    <schema destdir="${test.generated.dir}">
+      <fileset dir="${test.src.dir}">
+        <include name="**/*.avsc" />
+      </fileset>
+    </schema>
+  </target>
+
   <!-- ================================================================== -->
   <!-- Compile test code                                                  --> 
   <!-- ================================================================== -->
-  <target name="compile-core-test" depends="compile-core-classes, ivy-retrieve-test, generate-test-records">
+  <target name="compile-core-test" depends="compile-core-classes, ivy-retrieve-test, generate-test-records, generate-avro-records">
     <mkdir dir="${test.core.build.classes}"/>
     <javac 
      encoding="${build.encoding}" 

ivy.xml

@@ -269,6 +269,18 @@
       rev="${slf4j-log4j12.version}"
       conf="common->master">
     </dependency>
+    <dependency org="org.apache.hadoop"
+      name="avro"
+      rev="1.0.0"
+      conf="common->default"/>
+    <dependency org="org.codehaus.jackson"
+      name="jackson-mapper-asl"
+      rev="1.0.1"
+      conf="common->default"/>
+    <dependency org="com.thoughtworks.paranamer"
+      name="paranamer"
+      rev="1.5"
+      conf="common->default"/>
     </dependencies>
   
 </ivy-module>

ivy/ivysettings.xml

@@ -74,7 +74,7 @@
     rather than look for them online.
 
     -->
-    <module organisation="org.apache.hadoop" name=".*" resolver="internal"/>
+    <module organisation="org.apache.hadoop" name="Hadoop.*" resolver="internal"/>
     <!--until commons cli is external, we need to pull it in from the snapshot repository -if present -->
     <module organisation="org.apache.commons" name=".*" resolver="external-and-snapshots"/>
   </modules>

src/java/core-default.xml

@@ -85,7 +85,7 @@
 
 <property>
   <name>io.serializations</name>
-  <value>org.apache.hadoop.io.serializer.WritableSerialization</value>
+  <value>org.apache.hadoop.io.serializer.WritableSerialization,org.apache.hadoop.io.serializer.avro.AvroSpecificSerialization,org.apache.hadoop.io.serializer.avro.AvroReflectSerialization</value>
   <description>A list of serialization classes that can be used for
   obtaining serializers and deserializers.</description>
 </property>

src/java/org/apache/hadoop/io/serializer/SerializationFactory.java

@@ -25,6 +25,8 @@
 import org.apache.commons.logging.LogFactory;
 import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.conf.Configured;
+import org.apache.hadoop.io.serializer.avro.AvroReflectSerialization;
+import org.apache.hadoop.io.serializer.avro.AvroSpecificSerialization;
 import org.apache.hadoop.util.ReflectionUtils;
 import org.apache.hadoop.util.StringUtils;
 
@@ -50,7 +52,9 @@ public class SerializationFactory extends Configured {
   public SerializationFactory(Configuration conf) {
     super(conf);
     for (String serializerName : conf.getStrings("io.serializations", 
-      new String[]{"org.apache.hadoop.io.serializer.WritableSerialization"})) {
+      new String[]{WritableSerialization.class.getName(), 
+        AvroSpecificSerialization.class.getName(), 
+        AvroReflectSerialization.class.getName()})) {
       add(conf, serializerName);
     }
   }

src/java/org/apache/hadoop/io/serializer/avro/AvroReflectSerializable.java

@@ -0,0 +1,28 @@
+/**
+ * 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.io.serializer.avro;
+
+/**
+ * Tag interface for Avro 'reflect' serializable classes. Classes implementing 
+ * this interface can be serialized/deserialized using 
+ * {@link AvroReflectSerialization}.
+ */
+public interface AvroReflectSerializable {
+
+}

src/java/org/apache/hadoop/io/serializer/avro/AvroReflectSerialization.java

@@ -0,0 +1,89 @@
+/**
+ * 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.io.serializer.avro;
+
+import java.util.HashSet;
+import java.util.Set;
+
+import org.apache.avro.Schema;
+import org.apache.avro.io.DatumReader;
+import org.apache.avro.io.DatumWriter;
+import org.apache.avro.reflect.ReflectData;
+import org.apache.avro.reflect.ReflectDatumReader;
+import org.apache.avro.reflect.ReflectDatumWriter;
+
+/**
+ * Serialization for Avro Reflect classes. For a class to be accepted by this 
+ * serialization, it must either be in the package list configured via 
+ * {@link AvroReflectSerialization#AVRO_REFLECT_PACKAGES} or implement 
+ * {@link AvroReflectSerializable} interface.
+ *
+ */
+@SuppressWarnings("unchecked")
+public class AvroReflectSerialization extends AvroSerialization<Object>{
+
+  /**
+   * Key to configure packages that contain classes to be serialized and 
+   * deserialized using this class. Multiple packages can be specified using 
+   * comma-separated list.
+   */
+  public static final String AVRO_REFLECT_PACKAGES = "avro.reflect.pkgs";
+
+  private Set<String> packages; 
+
+  public synchronized boolean accept(Class<?> c) {
+    if (packages == null) {
+      getPackages();
+    }
+    return AvroReflectSerializable.class.isAssignableFrom(c) || 
+      packages.contains(c.getPackage().getName());
+  }
+
+  private void getPackages() {
+    String[] pkgList  = getConf().getStrings(AVRO_REFLECT_PACKAGES);
+    packages = new HashSet<String>();
+    if (pkgList != null) {
+      for (String pkg : pkgList) {
+        packages.add(pkg.trim());
+      }
+    }
+  }
+
+  protected DatumReader getReader(Class<Object> clazz) {
+    try {
+      String prefix =  
+        ((clazz.getEnclosingClass() == null 
+            || "null".equals(clazz.getEnclosingClass().getName())) ? 
+              clazz.getPackage().getName() + "." 
+              : (clazz.getEnclosingClass().getName() + "$"));
+      return new ReflectDatumReader(ReflectData.getSchema(clazz), prefix);
+    } catch (Exception e) {
+      throw new RuntimeException(e);
+    }
+  }
+
+  protected Schema getSchema(Object t) {
+    return ReflectData.getSchema(t.getClass());
+  }
+
+  protected DatumWriter getWriter(Class<Object> clazz) {
+    return new ReflectDatumWriter();
+  }
+
+}

src/java/org/apache/hadoop/io/serializer/avro/AvroSerialization.java

@@ -0,0 +1,117 @@
+/**
+ * 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.io.serializer.avro;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+
+import org.apache.avro.Schema;
+import org.apache.avro.io.BinaryDecoder;
+import org.apache.avro.io.BinaryEncoder;
+import org.apache.avro.io.DatumReader;
+import org.apache.avro.io.DatumWriter;
+import org.apache.hadoop.conf.Configured;
+import org.apache.hadoop.io.serializer.Deserializer;
+import org.apache.hadoop.io.serializer.Serialization;
+import org.apache.hadoop.io.serializer.Serializer;
+
+/**
+ * Base class for providing serialization to Avro types.
+ */
+public abstract class AvroSerialization<T> extends Configured 
+                                        implements Serialization<T>{
+
+  public Deserializer<T> getDeserializer(Class<T> c) {
+    return new AvroDeserializer(c);
+  }
+
+  public Serializer<T> getSerializer(Class<T> c) {
+    return new AvroSerializer(c);
+  }
+
+  /**
+   * Return an Avro Schema instance for the given class.
+   */
+  protected abstract Schema getSchema(T t);
+
+  /**
+   * Create and return Avro DatumWriter for the given class.
+   */
+  protected abstract DatumWriter<T> getWriter(Class<T> clazz);
+
+  /**
+   * Create and return Avro DatumReader for the given class.
+   */
+  protected abstract DatumReader<T> getReader(Class<T> clazz);
+
+  class AvroSerializer implements Serializer<T> {
+
+    private DatumWriter<T> writer;
+    private BinaryEncoder encoder;
+    private OutputStream outStream;
+    protected Class<T> clazz;
+
+    AvroSerializer(Class<T> clazz) {
+      writer = getWriter(clazz);
+    }
+
+    public void close() throws IOException {
+      encoder.flush();
+      outStream.close();
+    }
+
+    public void open(OutputStream out) throws IOException {
+      outStream = out;
+      encoder = new BinaryEncoder(out);
+    }
+
+    public void serialize(T t) throws IOException {
+      writer.setSchema(getSchema(t));
+      writer.write(t, encoder);
+    }
+
+  }
+
+  class AvroDeserializer implements Deserializer<T> {
+
+    private DatumReader<T> reader;
+    private BinaryDecoder decoder;
+    private InputStream inStream;
+
+    AvroDeserializer(Class<T> clazz) {
+      this.reader = getReader(clazz);
+    }
+
+    public void close() throws IOException {
+      inStream.close();
+    }
+
+    public T deserialize(T t) throws IOException {
+      return reader.read(t, decoder);
+    }
+
+    public void open(InputStream in) throws IOException {
+      inStream = in;
+      decoder = new BinaryDecoder(in);
+    }
+
+  }
+
+}

src/java/org/apache/hadoop/io/serializer/avro/AvroSpecificSerialization.java

@@ -0,0 +1,56 @@
+/**
+ * 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.io.serializer.avro;
+
+import org.apache.avro.Schema;
+import org.apache.avro.io.DatumReader;
+import org.apache.avro.io.DatumWriter;
+import org.apache.avro.specific.SpecificDatumReader;
+import org.apache.avro.specific.SpecificDatumWriter;
+import org.apache.avro.specific.SpecificRecord;
+
+/**
+ * Serialization for Avro Specific classes. This serialization is to be used 
+ * for classes generated by Avro's 'specific' compiler.
+ */
+@SuppressWarnings("unchecked")
+public class AvroSpecificSerialization 
+                          extends AvroSerialization<SpecificRecord>{
+
+  public boolean accept(Class<?> c) {
+    return SpecificRecord.class.isAssignableFrom(c);
+  }
+
+  protected DatumReader getReader(Class<SpecificRecord> clazz) {
+    try {
+      return new SpecificDatumReader(clazz.newInstance().schema());
+    } catch (Exception e) {
+      throw new RuntimeException(e);
+    }
+  }
+
+  protected Schema getSchema(SpecificRecord t) {
+    return t.schema();
+  }
+
+  protected DatumWriter getWriter(Class<SpecificRecord> clazz) {
+    return new SpecificDatumWriter();
+  }
+
+}

src/java/org/apache/hadoop/io/serializer/avro/package.html

@@ -0,0 +1,43 @@
+<html>
+
+<!--
+   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.
+-->
+
+<body>
+
+<p>
+This package provides Avro serialization in Hadoop. This can be used to 
+serialize/deserialize Avro types in Hadoop.
+</p>
+
+<p>
+Use {@link org.apache.hadoop.io.serializer.avro.AvroSpecificSerialization} for 
+serialization of classes generated by Avro's 'specific' compiler.
+</p>
+
+<p>
+Use {@link org.apache.hadoop.io.serializer.avro.AvroReflectSerialization} for 
+other classes. 
+{@link org.apache.hadoop.io.serializer.avro.AvroReflectSerialization} work for  
+any class which is either in the package list configured via 
+{@link org.apache.hadoop.io.serializer.avro.AvroReflectSerialization#AVRO_REFLECT_PACKAGES} 
+or implement {@link org.apache.hadoop.io.serializer.avro.AvroReflectSerializable}
+interface.
+</p>
+
+</body>
+</html>

src/test/core/org/apache/hadoop/io/serializer/SerializationTestUtil.java

@@ -0,0 +1,57 @@
+/**
+ * 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.io.serializer;
+
+import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.io.DataInputBuffer;
+import org.apache.hadoop.io.DataOutputBuffer;
+import org.apache.hadoop.util.GenericsUtil;
+
+public class SerializationTestUtil {
+
+  /**
+   * A utility that tests serialization/deserialization. 
+   * @param <K> the class of the item
+   * @param conf configuration to use, "io.serializations" is read to 
+   * determine the serialization
+   * @param before item to (de)serialize
+   * @return deserialized item
+   */
+  public static<K> K testSerialization(Configuration conf, K before) 
+    throws Exception {
+    
+    SerializationFactory factory = new SerializationFactory(conf);
+    Serializer<K> serializer 
+      = factory.getSerializer(GenericsUtil.getClass(before));
+    Deserializer<K> deserializer 
+      = factory.getDeserializer(GenericsUtil.getClass(before));
+   
+    DataOutputBuffer out = new DataOutputBuffer();
+    serializer.open(out);
+    serializer.serialize(before);
+    serializer.close();
+    
+    DataInputBuffer in = new DataInputBuffer();
+    in.reset(out.getData(), out.getLength());
+    deserializer.open(in);
+    K after = deserializer.deserialize(null);
+    deserializer.close();
+    return after;
+  }
+
+}

src/test/core/org/apache/hadoop/io/serializer/TestWritableSerialization.java

@@ -23,25 +23,18 @@
 import junit.framework.TestCase;
 
 import org.apache.hadoop.conf.Configuration;
-import org.apache.hadoop.io.DataInputBuffer;
-import org.apache.hadoop.io.DataOutputBuffer;
 import org.apache.hadoop.io.Text;
 import org.apache.hadoop.io.TestGenericWritable.Baz;
 import org.apache.hadoop.io.TestGenericWritable.FooGenericWritable;
-import org.apache.hadoop.util.GenericsUtil;
 
 public class TestWritableSerialization extends TestCase {
 
   private static final Configuration conf = new Configuration();
-  
-  static {
-    conf.set("io.serializations"
-        , "org.apache.hadoop.io.serializer.WritableSerialization");
-  }
-  
+
   public void testWritableSerialization() throws Exception {
     Text before = new Text("test writable"); 
-    testSerialization(conf, before);
+    Text after = SerializationTestUtil.testSerialization(conf, before);
+    assertEquals(before, after);
   }
   
   
@@ -56,40 +49,8 @@ public void testWritableConfigurable() throws Exception {
     generic.setConf(conf);
     Baz baz = new Baz();
     generic.set(baz);
-    Baz result = testSerialization(conf, baz);
+    Baz result = SerializationTestUtil.testSerialization(conf, baz);
+    assertEquals(baz, result);
     assertNotNull(result.getConf());
   }
-  
-  /**
-   * A utility that tests serialization/deserialization. 
-   * @param <K> the class of the item
-   * @param conf configuration to use, "io.serializations" is read to 
-   * determine the serialization
-   * @param before item to (de)serialize
-   * @return deserialized item
-   */
-  public static<K> K testSerialization(Configuration conf, K before) 
-    throws Exception {
-    
-    SerializationFactory factory = new SerializationFactory(conf);
-    Serializer<K> serializer 
-      = factory.getSerializer(GenericsUtil.getClass(before));
-    Deserializer<K> deserializer 
-      = factory.getDeserializer(GenericsUtil.getClass(before));
-   
-    DataOutputBuffer out = new DataOutputBuffer();
-    serializer.open(out);
-    serializer.serialize(before);
-    serializer.close();
-    
-    DataInputBuffer in = new DataInputBuffer();
-    in.reset(out.getData(), out.getLength());
-    deserializer.open(in);
-    K after = deserializer.deserialize(null);
-    deserializer.close();
-    
-    assertEquals(before, after);
-    return after;
-  }
-  
 }

src/test/core/org/apache/hadoop/io/serializer/avro/Record.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.io.serializer.avro;
+
+public class Record {
+  public int x = 7;
+
+  public int hashCode() {
+    return x;
+  }
+
+  public boolean equals(Object obj) {
+    if (this == obj)
+      return true;
+    if (obj == null)
+      return false;
+    if (getClass() != obj.getClass())
+      return false;
+    final Record other = (Record) obj;
+    if (x != other.x)
+      return false;
+    return true;
+  }
+}

src/test/core/org/apache/hadoop/io/serializer/avro/TestAvroSerialization.java

@@ -0,0 +1,104 @@
+/**
+ * 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.io.serializer.avro;
+
+import junit.framework.TestCase;
+
+import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.io.serializer.SerializationTestUtil;
+
+public class TestAvroSerialization extends TestCase {
+
+  private static final Configuration conf = new Configuration();
+
+  public void testSpecific() throws Exception {
+    AvroRecord before = new AvroRecord();
+    before.intField = 5;
+    AvroRecord after = SerializationTestUtil.testSerialization(conf, before);
+    assertEquals(before, after);
+  }
+
+  public void testReflectPkg() throws Exception {
+    Record before = new Record();
+    before.x = 10;
+    conf.set(AvroReflectSerialization.AVRO_REFLECT_PACKAGES, 
+        before.getClass().getPackage().getName());
+    Record after = SerializationTestUtil.testSerialization(conf, before);
+    assertEquals(before, after);
+  }
+
+  public void testReflectInnerClass() throws Exception {
+    InnerRecord before = new InnerRecord();
+    before.x = 10;
+    conf.set(AvroReflectSerialization.AVRO_REFLECT_PACKAGES, 
+        before.getClass().getPackage().getName());
+    InnerRecord after = SerializationTestUtil.testSerialization(conf, before);
+    assertEquals(before, after);
+  }
+
+  public void testReflect() throws Exception {
+    RefSerializable before = new RefSerializable();
+    before.x = 10;
+    RefSerializable after = 
+      SerializationTestUtil.testSerialization(conf, before);
+    assertEquals(before, after);
+  }
+
+  public static class InnerRecord {
+    public int x = 7;
+
+    public int hashCode() {
+      return x;
+    }
+
+    public boolean equals(Object obj) {
+      if (this == obj)
+        return true;
+      if (obj == null)
+        return false;
+      if (getClass() != obj.getClass())
+        return false;
+      final InnerRecord other = (InnerRecord) obj;
+      if (x != other.x)
+        return false;
+      return true;
+    }
+  }
+
+  public static class RefSerializable implements AvroReflectSerializable {
+    public int x = 7;
+
+    public int hashCode() {
+      return x;
+    }
+
+    public boolean equals(Object obj) {
+      if (this == obj)
+        return true;
+      if (obj == null)
+        return false;
+      if (getClass() != obj.getClass())
+        return false;
+      final RefSerializable other = (RefSerializable) obj;
+      if (x != other.x)
+        return false;
+      return true;
+    }
+  }
+}

src/test/core/org/apache/hadoop/io/serializer/avro/avroRecord.avsc

@@ -0,0 +1,23 @@
+// 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.
+ 
+
+{"type": "record", "name":"AvroRecord", 
+  "namespace": "org.apache.hadoop.io.serializer.avro",
+  "fields": [
+      {"name": "intField", "type": "int"}
+  ]
+}