HDFS-14888. RBF: Enable Parallel Test Profile for builds. Contributed by Ayush Saxena.

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

@@ -236,4 +236,52 @@ https://maven.apache.org/xsd/maven-4.0.0.xsd">
       </plugin>
     </plugins>
   </build>
+  <profiles>
+    <profile>
+      <id>parallel-tests</id>
+      <build>
+        <plugins>
+          <plugin>
+            <groupId>org.apache.hadoop</groupId>
+            <artifactId>hadoop-maven-plugins</artifactId>
+            <executions>
+              <execution>
+                <id>parallel-tests-createdir</id>
+                <goals>
+                  <goal>parallel-tests-createdir</goal>
+                </goals>
+              </execution>
+            </executions>
+          </plugin>
+          <plugin>
+            <groupId>org.apache.maven.plugins</groupId>
+            <artifactId>maven-surefire-plugin</artifactId>
+            <configuration>
+              <forkCount>${testsThreadCount}</forkCount>
+              <reuseForks>false</reuseForks>
+              <argLine>${maven-surefire-plugin.argLine} -DminiClusterDedicatedDirs=true</argLine>
+              <systemPropertyVariables>
+                <testsThreadCount>${testsThreadCount}</testsThreadCount>
+                <test.build.data>${test.build.data}/${surefire.forkNumber}</test.build.data>
+                <test.build.dir>${test.build.dir}/${surefire.forkNumber}</test.build.dir>
+                <hadoop.tmp.dir>${hadoop.tmp.dir}/${surefire.forkNumber}</hadoop.tmp.dir>
+
+                <!-- This is intentionally the same directory for all JUnit -->
+                <!-- forks, for use in the very rare situation that -->
+                <!-- concurrent tests need to coordinate, such as using lock -->
+                <!-- files. -->
+                <test.build.shared.data>${test.build.data}</test.build.shared.data>
+
+                <!-- Due to a Maven quirk, setting this to just -->
+                <!-- surefire.forkNumber won't do the parameter substitution. -->
+                <!-- Putting a prefix in front of it like "fork-" makes it -->
+                <!-- work. -->
+                <test.unique.fork.id>fork-${surefire.forkNumber}</test.unique.fork.id>
+              </systemPropertyVariables>
+            </configuration>
+          </plugin>
+        </plugins>
+      </build>
+    </profile>
+    </profiles>
 </project>