HADOOP-16598. Backport "HADOOP-16558 [COMMON+HDFS] use protobuf-maven-plugin to generate protobuf classes" to all active branches

Signed-off-by: stack <stack@apache.org>

hadoop-common-project/hadoop-common/pom.xml

@@ -351,6 +351,20 @@
       </resource>
     </resources>
     <plugins>
+      <plugin>
+        <groupId>org.xolstice.maven.plugins</groupId>
+        <artifactId>protobuf-maven-plugin</artifactId>
+        <executions>
+          <execution>
+            <id>src-compile-protoc</id>
+            <configuration><skip>false</skip></configuration>
+          </execution>
+          <execution>
+            <id>src-test-compile-protoc</id>
+            <configuration><skip>false</skip></configuration>
+          </execution>
+        </executions>
+      </plugin>
       <plugin>
         <groupId>org.apache.hadoop</groupId>
         <artifactId>hadoop-maven-plugins</artifactId>
@@ -371,58 +385,6 @@
               </source>
             </configuration>
           </execution>
-          <execution>
-            <id>compile-protoc</id>
-            <goals>
-              <goal>protoc</goal>
-            </goals>
-            <configuration>
-              <protocVersion>${protobuf.version}</protocVersion>
-              <protocCommand>${protoc.path}</protocCommand>
-              <imports>
-                <param>${basedir}/src/main/proto</param>
-              </imports>
-              <source>
-                <directory>${basedir}/src/main/proto</directory>
-                <includes>
-                  <include>HAServiceProtocol.proto</include>
-                  <include>IpcConnectionContext.proto</include>
-                  <include>ProtocolInfo.proto</include>
-                  <include>RpcHeader.proto</include>
-                  <include>ZKFCProtocol.proto</include>
-                  <include>ProtobufRpcEngine.proto</include>
-                  <include>Security.proto</include>
-                  <include>GetUserMappingsProtocol.proto</include>
-                  <include>TraceAdmin.proto</include>
-                  <include>RefreshAuthorizationPolicyProtocol.proto</include>
-                  <include>RefreshUserMappingsProtocol.proto</include>
-                  <include>RefreshCallQueueProtocol.proto</include>
-                  <include>GenericRefreshProtocol.proto</include>
-                  <include>FSProtos.proto</include>
-                </includes>
-              </source>
-            </configuration>
-          </execution>
-          <execution>
-            <id>compile-test-protoc</id>
-            <goals>
-              <goal>test-protoc</goal>
-            </goals>
-            <configuration>
-              <protocVersion>${protobuf.version}</protocVersion>
-              <protocCommand>${protoc.path}</protocCommand>
-              <imports>
-                <param>${basedir}/src/test/proto</param>
-              </imports>
-              <source>
-                <directory>${basedir}/src/test/proto</directory>
-                <includes>
-                  <include>test.proto</include>
-                  <include>test_rpc_service.proto</include>
-                </includes>
-              </source>
-            </configuration>
-          </execution>
           <execution>
             <id>resource-gz</id>
             <phase>generate-resources</phase>

hadoop-common-project/hadoop-common/src/main/proto/FSProtos.proto

@@ -21,7 +21,7 @@
  * Please see http://wiki.apache.org/hadoop/Compatibility
  * for what changes are allowed for a *stable* .proto interface.
  */
-
+syntax = "proto2";
 option java_package = "org.apache.hadoop.fs";
 option java_outer_classname = "FSProtos";
 option java_generic_services = true;

hadoop-common-project/hadoop-common/src/main/proto/GenericRefreshProtocol.proto

@@ -21,7 +21,7 @@
  * Please see http://wiki.apache.org/hadoop/Compatibility
  * for what changes are allowed for a *stable* .proto interface.
  */
-
+syntax = "proto2";
 option java_package = "org.apache.hadoop.ipc.proto";
 option java_outer_classname = "GenericRefreshProtocolProtos";
 option java_generic_services = true;

hadoop-common-project/hadoop-common/src/main/proto/GetUserMappingsProtocol.proto

@@ -21,7 +21,7 @@
  * Please see http://wiki.apache.org/hadoop/Compatibility
  * for what changes are allowed for a *stable* .proto interface.
  */
-
+syntax = "proto2";
 option java_package = "org.apache.hadoop.tools.proto";
 option java_outer_classname = "GetUserMappingsProtocolProtos";
 option java_generic_services = true;

hadoop-common-project/hadoop-common/src/main/proto/HAServiceProtocol.proto

@@ -21,7 +21,7 @@
  * Please see http://wiki.apache.org/hadoop/Compatibility
  * for what changes are allowed for a *stable* .proto interface.
  */
-
+syntax = "proto2";
 option java_package = "org.apache.hadoop.ha.proto";
 option java_outer_classname = "HAServiceProtocolProtos";
 option java_generic_services = true;

hadoop-common-project/hadoop-common/src/main/proto/IpcConnectionContext.proto

@@ -21,7 +21,7 @@
  * Please see http://wiki.apache.org/hadoop/Compatibility
  * for what changes are allowed for a *stable* .proto interface.
  */
-
+syntax = "proto2";
 option java_package = "org.apache.hadoop.ipc.protobuf";
 option java_outer_classname = "IpcConnectionContextProtos";
 option java_generate_equals_and_hash = true;

hadoop-common-project/hadoop-common/src/main/proto/ProtobufRpcEngine.proto

@@ -21,7 +21,7 @@
  * Please see http://wiki.apache.org/hadoop/Compatibility
  * for what changes are allowed for a *stable* .proto interface.
  */
-
+syntax = "proto2";
 /**
  * These are the messages used by Hadoop RPC for the Rpc Engine Protocol Buffer
  * to marshal the request and response in the RPC layer.

hadoop-common-project/hadoop-common/src/main/proto/ProtocolInfo.proto

@@ -21,7 +21,7 @@
  * Please see http://wiki.apache.org/hadoop/Compatibility
  * for what changes are allowed for a *stable* .proto interface.
  */
-
+syntax = "proto2";
 option java_package = "org.apache.hadoop.ipc.protobuf";
 option java_outer_classname = "ProtocolInfoProtos";
 option java_generic_services = true;

hadoop-common-project/hadoop-common/src/main/proto/RefreshAuthorizationPolicyProtocol.proto

@@ -21,7 +21,7 @@
  * Please see http://wiki.apache.org/hadoop/Compatibility
  * for what changes are allowed for a *stable* .proto interface.
  */
-
+syntax = "proto2";
 option java_package = "org.apache.hadoop.security.proto";
 option java_outer_classname = "RefreshAuthorizationPolicyProtocolProtos";
 option java_generic_services = true;

hadoop-common-project/hadoop-common/src/main/proto/RefreshCallQueueProtocol.proto

@@ -21,7 +21,7 @@
  * Please see http://wiki.apache.org/hadoop/Compatibility
  * for what changes are allowed for a *stable* .proto interface.
  */
-
+syntax = "proto2";
 option java_package = "org.apache.hadoop.ipc.proto";
 option java_outer_classname = "RefreshCallQueueProtocolProtos";
 option java_generic_services = true;

hadoop-common-project/hadoop-common/src/main/proto/RefreshUserMappingsProtocol.proto

@@ -21,7 +21,7 @@
  * Please see http://wiki.apache.org/hadoop/Compatibility
  * for what changes are allowed for a *stable* .proto interface.
  */
-
+syntax = "proto2";
 option java_package = "org.apache.hadoop.security.proto";
 option java_outer_classname = "RefreshUserMappingsProtocolProtos";
 option java_generic_services = true;

hadoop-common-project/hadoop-common/src/main/proto/RpcHeader.proto

@@ -21,7 +21,7 @@
  * Please see http://wiki.apache.org/hadoop/Compatibility
  * for what changes are allowed for a *stable* .proto interface.
  */
-
+syntax = "proto2";
 option java_package = "org.apache.hadoop.ipc.protobuf";
 option java_outer_classname = "RpcHeaderProtos";
 option java_generate_equals_and_hash = true;

hadoop-common-project/hadoop-common/src/main/proto/Security.proto

@@ -21,7 +21,7 @@
  * Please see http://wiki.apache.org/hadoop/Compatibility
  * for what changes are allowed for a *stable* .proto interface.
  */
-
+syntax = "proto2";
 option java_package = "org.apache.hadoop.security.proto";
 option java_outer_classname = "SecurityProtos";
 option java_generic_services = true;

hadoop-common-project/hadoop-common/src/main/proto/TraceAdmin.proto

@@ -21,7 +21,7 @@
  * Please see http://wiki.apache.org/hadoop/Compatibility
  * for what changes are allowed for a *stable* .proto interface.
  */
-
+syntax = "proto2";
 option java_package = "org.apache.hadoop.tracing";
 option java_outer_classname = "TraceAdminPB";
 option java_generic_services = true;

hadoop-common-project/hadoop-common/src/main/proto/ZKFCProtocol.proto

@@ -21,7 +21,7 @@
  * Please see http://wiki.apache.org/hadoop/Compatibility
  * for what changes are allowed for a *stable* .proto interface.
  */
-
+syntax = "proto2";
 option java_package = "org.apache.hadoop.ha.proto";
 option java_outer_classname = "ZKFCProtocolProtos";
 option java_generic_services = true;

hadoop-common-project/hadoop-common/src/test/proto/test.proto

@@ -15,7 +15,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-
+syntax = "proto2";
 option java_package = "org.apache.hadoop.ipc.protobuf";
 option java_outer_classname = "TestProtos";
 option java_generate_equals_and_hash = true;

hadoop-common-project/hadoop-common/src/test/proto/test_rpc_service.proto

@@ -15,6 +15,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
+syntax = "proto2";
 option java_package = "org.apache.hadoop.ipc.protobuf";
 option java_outer_classname = "TestRpcServiceProtos";
 option java_generic_services = true;

hadoop-hdfs-project/hadoop-hdfs-client/pom.xml

@@ -131,36 +131,18 @@ http://maven.apache.org/xsd/maven-4.0.0.xsd">
         </configuration>
       </plugin>
       <plugin>
-        <groupId>org.apache.hadoop</groupId>
+        <groupId>org.xolstice.maven.plugins</groupId>
-        <artifactId>hadoop-maven-plugins</artifactId>
+        <artifactId>protobuf-maven-plugin</artifactId>
         <executions>
           <execution>
-            <id>compile-protoc</id>
+            <id>src-compile-protoc</id>
-            <goals>
-              <goal>protoc</goal>
-            </goals>
             <configuration>
-              <protocVersion>${protobuf.version}</protocVersion>
+              <skip>false</skip>
-              <protocCommand>${protoc.path}</protocCommand>
+              <additionalProtoPathElements>
-              <imports>
+                <additionalProtoPathElement>
-                <param>${basedir}/../../hadoop-common-project/hadoop-common/src/main/proto</param>
+                  ${basedir}/../../hadoop-common-project/hadoop-common/src/main/proto
-                <param>${basedir}/src/main/proto</param>
+                </additionalProtoPathElement>
-              </imports>
+              </additionalProtoPathElements>
-              <source>
-                <directory>${basedir}/src/main/proto</directory>
-                <includes>
-                  <include>ClientDatanodeProtocol.proto</include>
-                  <include>ClientNamenodeProtocol.proto</include>
-                  <include>acl.proto</include>
-                  <include>xattr.proto</include>
-                  <include>datatransfer.proto</include>
-                  <include>hdfs.proto</include>
-                  <include>encryption.proto</include>
-                  <include>inotify.proto</include>
-                  <include>erasurecoding.proto</include>
-                  <include>ReconfigurationProtocol.proto</include>
-                </includes>
-              </source>
             </configuration>
           </execution>
         </executions>

hadoop-hdfs-project/hadoop-hdfs-client/src/main/proto/ClientDatanodeProtocol.proto

@@ -21,7 +21,7 @@
  * Please see http://wiki.apache.org/hadoop/Compatibility
  * for what changes are allowed for a *stable* .proto interface.
  */
-
+syntax="proto2";
 // This file contains protocol buffers that are used throughout HDFS -- i.e.
 // by the client, server, and data transfer protocols.
 

hadoop-hdfs-project/hadoop-hdfs-client/src/main/proto/ClientNamenodeProtocol.proto

@@ -21,7 +21,7 @@
  * Please see http://wiki.apache.org/hadoop/Compatibility
  * for what changes are allowed for a *stable* .proto interface.
  */
-
+syntax="proto2";
 option java_package = "org.apache.hadoop.hdfs.protocol.proto";
 option java_outer_classname = "ClientNamenodeProtocolProtos";
 option java_generic_services = true;

hadoop-hdfs-project/hadoop-hdfs-client/src/main/proto/ReconfigurationProtocol.proto

@@ -15,7 +15,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-
+syntax="proto2";
  // This file contains protocol buffers that are used to reconfigure NameNode
  // and DataNode by HDFS admin.
 

hadoop-hdfs-project/hadoop-hdfs-client/src/main/proto/acl.proto

@@ -15,7 +15,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-
+syntax="proto2";
 option java_package = "org.apache.hadoop.hdfs.protocol.proto";
 option java_outer_classname = "AclProtos";
 option java_generate_equals_and_hash = true;

hadoop-hdfs-project/hadoop-hdfs-client/src/main/proto/datatransfer.proto

@@ -21,7 +21,7 @@
  * Please see http://wiki.apache.org/hadoop/Compatibility
  * for what changes are allowed for a *stable* .proto interface.
  */
-
+syntax="proto2";
 // This file contains protocol buffers that are used to transfer data
 // to and from the datanode, as well as between datanodes.
 

hadoop-hdfs-project/hadoop-hdfs-client/src/main/proto/encryption.proto

@@ -21,7 +21,7 @@
  * Please see http://wiki.apache.org/hadoop/Compatibility
  * for what changes are allowed for a *stable* .proto interface.
  */
-
+syntax="proto2";
 // This file contains protocol buffers that are used throughout HDFS -- i.e.
 // by the client, server, and data transfer protocols.
 

hadoop-hdfs-project/hadoop-hdfs-client/src/main/proto/erasurecoding.proto

@@ -15,7 +15,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
- 
+syntax="proto2";
 option java_package = "org.apache.hadoop.hdfs.protocol.proto";
 option java_outer_classname = "ErasureCodingProtos";
 option java_generate_equals_and_hash = true;

hadoop-hdfs-project/hadoop-hdfs-client/src/main/proto/hdfs.proto

@@ -21,7 +21,7 @@
  * Please see http://wiki.apache.org/hadoop/Compatibility
  * for what changes are allowed for a *stable* .proto interface.
  */
-
+syntax="proto2";
 // This file contains protocol buffers that are used throughout HDFS -- i.e.
 // by the client, server, and data transfer protocols.
 

hadoop-hdfs-project/hadoop-hdfs-client/src/main/proto/inotify.proto

@@ -21,7 +21,7 @@
  * Please see http://wiki.apache.org/hadoop/Compatibility
  * for what changes are allowed for a *stable* .proto interface.
  */
-
+syntax="proto2";
 // This file contains protocol buffers used to communicate edits to clients
 // as part of the inotify system.
 

hadoop-hdfs-project/hadoop-hdfs-client/src/main/proto/xattr.proto

@@ -15,7 +15,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-
+syntax="proto2";
 option java_package = "org.apache.hadoop.hdfs.protocol.proto";
 option java_outer_classname = "XAttrProtos";
 option java_generate_equals_and_hash = true;

hadoop-hdfs-project/hadoop-hdfs-rbf/pom.xml

@@ -174,29 +174,21 @@ http://maven.apache.org/xsd/maven-4.0.0.xsd">
         </executions>
       </plugin>
       <plugin>
-        <groupId>org.apache.hadoop</groupId>
+        <groupId>org.xolstice.maven.plugins</groupId>
-        <artifactId>hadoop-maven-plugins</artifactId>
+        <artifactId>protobuf-maven-plugin</artifactId>
         <executions>
           <execution>
-            <id>compile-protoc</id>
+            <id>src-compile-protoc</id>
-            <goals>
-              <goal>protoc</goal>
-            </goals>
             <configuration>
-              <protocVersion>${protobuf.version}</protocVersion>
+              <skip>false</skip>
-              <protocCommand>${protoc.path}</protocCommand>
+              <additionalProtoPathElements>
-              <imports>
+                <additionalProtoPathElement>
-                <param>${basedir}/../hadoop-hdfs-client/src/main/proto</param>
+                  ${basedir}/../../hadoop-common-project/hadoop-common/src/main/proto
-                <param>${basedir}/../../hadoop-common-project/hadoop-common/src/main/proto</param>
+                </additionalProtoPathElement>
-                <param>${basedir}/src/main/proto</param>
+                <additionalProtoPathElement>
-              </imports>
+                  ${basedir}/../hadoop-hdfs-client/src/main/proto
-              <source>
+                </additionalProtoPathElement>
-                <directory>${basedir}/src/main/proto</directory>
+              </additionalProtoPathElements>
-                <includes>
-                  <include>FederationProtocol.proto</include>
-                  <include>RouterProtocol.proto</include>
-                </includes>
-              </source>
             </configuration>
           </execution>
         </executions>

hadoop-hdfs-project/hadoop-hdfs-rbf/src/main/proto/FederationProtocol.proto

@@ -15,7 +15,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-
+syntax = "proto2";
 option java_package = "org.apache.hadoop.hdfs.federation.protocol.proto";
 option java_outer_classname = "HdfsServerFederationProtos";
 option java_generic_services = true;

hadoop-hdfs-project/hadoop-hdfs-rbf/src/main/proto/RouterProtocol.proto

@@ -15,7 +15,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-
+syntax = "proto2";
 option java_package = "org.apache.hadoop.hdfs.protocol.proto";
 option java_outer_classname = "RouterProtocolProtos";
 option java_generic_services = true;

hadoop-hdfs-project/hadoop-hdfs/pom.xml

@@ -306,40 +306,30 @@ http://maven.apache.org/xsd/maven-4.0.0.xsd">
           </execution>
         </executions>
       </plugin>
+      <plugin>
+        <groupId>org.xolstice.maven.plugins</groupId>
+        <artifactId>protobuf-maven-plugin</artifactId>
+        <executions>
+          <execution>
+            <id>src-compile-protoc</id>
+            <configuration>
+              <skip>false</skip>
+              <additionalProtoPathElements>
+                <additionalProtoPathElement>
+                  ${basedir}/../../hadoop-common-project/hadoop-common/src/main/proto
+                </additionalProtoPathElement>
+                <additionalProtoPathElement>
+                  ${basedir}/../hadoop-hdfs-client/src/main/proto
+                </additionalProtoPathElement>
+              </additionalProtoPathElements>
+            </configuration>
+          </execution>
+        </executions>
+      </plugin>
       <plugin>
         <groupId>org.apache.hadoop</groupId>
         <artifactId>hadoop-maven-plugins</artifactId>
         <executions>
-          <execution>
-            <id>compile-protoc</id>
-            <goals>
-              <goal>protoc</goal>
-            </goals>
-            <configuration>
-              <protocVersion>${protobuf.version}</protocVersion>
-              <protocCommand>${protoc.path}</protocCommand>
-              <imports>
-                <param>${basedir}/../../hadoop-common-project/hadoop-common/src/main/proto</param>
-                <param>${basedir}/../hadoop-hdfs-client/src/main/proto</param>
-                <param>${basedir}/src/main/proto</param>
-              </imports>
-              <source>
-                <directory>${basedir}/src/main/proto</directory>
-                <includes>
-                  <include>HdfsServer.proto</include>
-                  <include>DatanodeProtocol.proto</include>
-                  <include>DatanodeLifelineProtocol.proto</include>
-                  <include>HAZKInfo.proto</include>
-                  <include>InterDatanodeProtocol.proto</include>
-                  <include>JournalProtocol.proto</include>
-                  <include>NamenodeProtocol.proto</include>
-                  <include>QJournalProtocol.proto</include>
-                  <include>editlog.proto</include>
-                  <include>fsimage.proto</include>
-                </includes>
-              </source>
-            </configuration>
-          </execution>
           <execution>
             <id>resource-gz</id>
             <phase>generate-resources</phase>

hadoop-hdfs-project/hadoop-hdfs/src/main/proto/DatanodeLifelineProtocol.proto

@@ -21,7 +21,7 @@
  * Please see http://wiki.apache.org/hadoop/Compatibility
  * for what changes are allowed for a *stable* .proto interface.
  */
-
+syntax = "proto2";
 option java_package = "org.apache.hadoop.hdfs.protocol.proto";
 option java_outer_classname = "DatanodeLifelineProtocolProtos";
 option java_generic_services = true;

hadoop-hdfs-project/hadoop-hdfs/src/main/proto/DatanodeProtocol.proto

@@ -24,7 +24,7 @@
 
 // This file contains protocol buffers that are used throughout HDFS -- i.e.
 // by the client, server, and data transfer protocols.
-
+syntax = "proto2";
 option java_package = "org.apache.hadoop.hdfs.protocol.proto";
 option java_outer_classname = "DatanodeProtocolProtos";
 option java_generic_services = true;

hadoop-hdfs-project/hadoop-hdfs/src/main/proto/HAZKInfo.proto

@@ -21,7 +21,7 @@
  * Please see http://wiki.apache.org/hadoop/Compatibility
  * for what changes are allowed for a *stable* .proto interface.
  */
-
+syntax = "proto2";
 option java_package = "org.apache.hadoop.hdfs.server.namenode.ha.proto";
 option java_outer_classname = "HAZKInfoProtos";
 package hadoop.hdfs;

hadoop-hdfs-project/hadoop-hdfs/src/main/proto/HdfsServer.proto

@@ -24,7 +24,7 @@
 
 // This file contains protocol buffers that are used throughout HDFS -- i.e.
 // by the client, server, and data transfer protocols.
-
+syntax = "proto2";
 
 option java_package = "org.apache.hadoop.hdfs.protocol.proto";
 option java_outer_classname = "HdfsServerProtos";

hadoop-hdfs-project/hadoop-hdfs/src/main/proto/InterDatanodeProtocol.proto

@@ -24,7 +24,7 @@
 
 // This file contains protocol buffers that are used throughout HDFS -- i.e.
 // by the client, server, and data transfer protocols.
-
+syntax = "proto2";
 option java_package = "org.apache.hadoop.hdfs.protocol.proto";
 option java_outer_classname = "InterDatanodeProtocolProtos";
 option java_generic_services = true;

hadoop-hdfs-project/hadoop-hdfs/src/main/proto/JournalProtocol.proto

@@ -24,7 +24,7 @@
 
 // This file contains protocol buffers that are used throughout HDFS -- i.e.
 // by the client, server, and data transfer protocols.
-
+syntax = "proto2";
 option java_package = "org.apache.hadoop.hdfs.protocol.proto";
 option java_outer_classname = "JournalProtocolProtos";
 option java_generic_services = true;

hadoop-hdfs-project/hadoop-hdfs/src/main/proto/NamenodeProtocol.proto

@@ -24,7 +24,7 @@
 
 // This file contains protocol buffers that are used throughout HDFS -- i.e.
 // by the client, server, and data transfer protocols.
-
+syntax = "proto2";
 option java_package = "org.apache.hadoop.hdfs.protocol.proto";
 option java_outer_classname = "NamenodeProtocolProtos";
 option java_generic_services = true;

hadoop-hdfs-project/hadoop-hdfs/src/main/proto/QJournalProtocol.proto

@@ -21,7 +21,7 @@
  * Please see http://wiki.apache.org/hadoop/Compatibility
  * for what changes are allowed for a *stable* .proto interface.
  */
-
+syntax = "proto2";
 option java_package = "org.apache.hadoop.hdfs.qjournal.protocol";
 option java_outer_classname = "QJournalProtocolProtos";
 option java_generic_services = true;

hadoop-hdfs-project/hadoop-hdfs/src/main/proto/editlog.proto

@@ -15,7 +15,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-
+syntax = "proto2";
 option java_package = "org.apache.hadoop.hdfs.protocol.proto";
 option java_outer_classname = "EditLogProtos";
 option java_generate_equals_and_hash = true;

hadoop-hdfs-project/hadoop-hdfs/src/main/proto/fsimage.proto

@@ -15,7 +15,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-
+syntax = "proto2";
 option java_package = "org.apache.hadoop.hdfs.server.namenode";
 option java_outer_classname = "FsImageProto";
 

hadoop-project/pom.xml

@@ -85,6 +85,10 @@
     <protobuf.version>2.5.0</protobuf.version>
     <protoc.path>${env.HADOOP_PROTOC_PATH}</protoc.path>
 
+    <!-- Maven protoc compiler -->
+    <protobuf-maven-plugin.version>0.5.1</protobuf-maven-plugin.version>
+    <os-maven-plugin.version>1.5.0.Final</os-maven-plugin.version>
+
     <zookeeper.version>3.4.13</zookeeper.version>
     <curator.version>2.13.0</curator.version>
     <findbugs.version>3.0.0</findbugs.version>
@@ -1475,9 +1479,56 @@
           <artifactId>hadoop-maven-plugins</artifactId>
           <version>${project.version}</version>
         </plugin>
+        <plugin>
+          <groupId>org.xolstice.maven.plugins</groupId>
+          <artifactId>protobuf-maven-plugin</artifactId>
+          <version>${protobuf-maven-plugin.version}</version>
+          <extensions>true</extensions>
+          <configuration>
+            <protocArtifact>
+              com.google.protobuf:protoc:${protobuf.version}:exe:${os.detected.classifier}
+            </protocArtifact>
+            <attachProtoSources>false</attachProtoSources>
+          </configuration>
+          <executions>
+            <execution>
+              <id>src-compile-protoc</id>
+              <phase>generate-sources</phase>
+              <goals>
+                <goal>compile</goal>
+              </goals>
+              <configuration>
+                <includeDependenciesInDescriptorSet>false</includeDependenciesInDescriptorSet>
+                <protoSourceRoot>${basedir}/src/main/proto</protoSourceRoot>
+                <outputDirectory>${project.build.directory}/generated-sources/java</outputDirectory>
+                <clearOutputDirectory>false</clearOutputDirectory>
+                <skip>true</skip>
+              </configuration>
+            </execution>
+            <execution>
+              <id>src-test-compile-protoc</id>
+              <phase>generate-test-sources</phase>
+              <goals>
+                <goal>test-compile</goal>
+              </goals>
+              <configuration>
+                <protoTestSourceRoot>${basedir}/src/test/proto</protoTestSourceRoot>
+                <outputDirectory>${project.build.directory}/generated-test-sources/java</outputDirectory>
+                <clearOutputDirectory>false</clearOutputDirectory>
+                <skip>true</skip>
+              </configuration>
+            </execution>
+          </executions>
+        </plugin>
       </plugins>
     </pluginManagement>
-
+    <extensions>
+      <extension>
+        <groupId>kr.motd.maven</groupId>
+        <artifactId>os-maven-plugin</artifactId>
+        <version>${os-maven-plugin.version}</version>
+      </extension>
+    </extensions>
     <plugins>
       <plugin>
         <artifactId>maven-clean-plugin</artifactId>