SPARK-3039: Allow spark to be built using avro-mapred for hadoop2

SPARK-3039: Adds the maven property "avro.mapred.classifier" to build spark-assembly with avro-mapred with support for the new Hadoop API. Sets this property to hadoop2 for Hadoop 2 profiles.

I am not very familiar with maven, nor do I know whether this potentially breaks something in the hive part of spark. There might be a more elegant way of doing this.

Author: Bertrand Bossy <bertrandbossy@gmail.com>

Closes #1945 from bbossy/SPARK-3039 and squashes the following commits:

c32ce59 [Bertrand Bossy] SPARK-3039: Allow spark to be built using avro-mapred for hadoop2

pom.xml

@@ -134,6 +134,7 @@
     <chill.version>0.3.6</chill.version>
     <codahale.metrics.version>3.0.0</codahale.metrics.version>
     <avro.version>1.7.6</avro.version>
+    <avro.mapred.classifier></avro.mapred.classifier>
     <jets3t.version>0.7.1</jets3t.version>
     <aws.java.sdk.version>1.8.3</aws.java.sdk.version>
     <aws.kinesis.client.version>1.1.0</aws.kinesis.client.version>
@@ -621,6 +622,7 @@
         <groupId>org.apache.avro</groupId>
         <artifactId>avro-mapred</artifactId>
         <version>${avro.version}</version>
+        <classifier>${avro.mapred.classifier}</classifier>
         <exclusions>
           <exclusion>
             <groupId>io.netty</groupId>
@@ -1108,6 +1110,7 @@
       <properties>
         <hadoop.version>2.2.0</hadoop.version>
         <protobuf.version>2.5.0</protobuf.version>
+        <avro.mapred.classifier>hadoop2</avro.mapred.classifier>
       </properties>
     </profile>
 
@@ -1117,6 +1120,7 @@
         <hadoop.version>2.3.0</hadoop.version>
         <protobuf.version>2.5.0</protobuf.version>
         <jets3t.version>0.9.0</jets3t.version>
+        <avro.mapred.classifier>hadoop2</avro.mapred.classifier>
       </properties>
     </profile>
 
@@ -1126,6 +1130,7 @@
         <hadoop.version>2.4.0</hadoop.version>
         <protobuf.version>2.5.0</protobuf.version>
         <jets3t.version>0.9.0</jets3t.version>
+        <avro.mapred.classifier>hadoop2</avro.mapred.classifier>
       </properties>
     </profile>
 

sql/hive/pom.xml

@@ -95,6 +95,15 @@
     <dependency>
       <groupId>org.apache.avro</groupId>
       <artifactId>avro</artifactId>
+      <version>${avro.version}</version>
+    </dependency>
+    <!-- use the build matching the hadoop api of avro-mapred (i.e. no classifier for hadoop 1 API,
+    hadoop2 classifier for hadoop 2 API. avro-mapred is a dependency of org.spark-project.hive:hive-serde -->
+    <dependency>
+      <groupId>org.apache.avro</groupId>
+      <artifactId>avro-mapred</artifactId>
+      <version>${avro.version}</version>
+      <classifier>${avro.mapred.classifier}</classifier>
     </dependency>
     <dependency>
       <groupId>org.scalatest</groupId>