[CI] Deploy SNAPSHOT JARs to S3 bucket

Jenkinsfile

@@ -95,6 +95,17 @@ pipeline {
         milestone ordinal: 4
       }
     }
+    stage('Jenkins Linux: Deploy') {
+      agent none
+      steps {
+        script {
+          parallel ([
+            'deploy-jvm-packages': { DeployJVMPackages(spark_version: '2.4.3') }
+          ])
+        }
+        milestone ordinal: 5
+      }
+    }
   }
 }
 
@@ -380,3 +391,18 @@ def TestR(args) {
     deleteDir()
   }
 }
+
+def DeployJVMPackages(args) {
+  node('linux && cpu') {
+    unstash name: 'srcs'
+    if (env.BRANCH_NAME == 'master' || env.BRANCH_NAME.startsWith('release')) {
+      echo 'Deploying to xgboost-maven-repo S3 repo...'
+      def container_type = "jvm"
+      def docker_binary = "docker"
+      sh """
+      ${dockerRun} ${container_type} ${docker_binary} tests/ci_build/deploy_jvm_packages.sh ${args.spark_version}
+      """
+    }
+    deleteDir()
+  }
+}

jvm-packages/pom.xml

@@ -205,6 +205,29 @@
                 </plugins>
             </build>
         </profile>
+        <profile>
+            <id>release-to-s3</id>
+            <distributionManagement>
+                <snapshotRepository>
+                    <id>maven-s3-snapshot-repo</id>
+                    <url>s3://xgboost-maven-repo/snapshot</url>
+                </snapshotRepository>
+                <repository>
+                    <id>maven-s3-release-repo</id>
+                    <url>s3://xgboost-maven-repo/release</url>
+                </repository>
+            </distributionManagement>
+            <repositories>
+                <repository>
+                    <id>maven-s3-snapshot-repo</id>
+                    <url>https://s3.amazonaws.com/xgboost-maven-repo/snapshot</url>
+                </repository>
+                <repository>
+                    <id>maven-s3-release-repo</id>
+                    <url>https://s3.amazonaws.com/xgboost-maven-repo/release</url>
+                </repository>
+            </repositories>
+        </profile>
     </profiles>
     <distributionManagement>
         <snapshotRepository>
@@ -324,6 +347,13 @@
                 </executions>
             </plugin>
         </plugins>
+        <extensions>
+            <extension>
+                <groupId>org.kuali.maven.wagons</groupId>
+                <artifactId>maven-s3-wagon</artifactId>
+                <version>1.2.1</version>
+            </extension>
+        </extensions>
     </build>
     <reporting>
         <plugins>

tests/ci_build/deploy_jvm_packages.sh

@@ -0,0 +1,25 @@
+#!/bin/bash
+
+set -e
+set -x
+
+if [ $# -ne 1 ]; then
+  echo "Usage: $0 [spark version]"
+  exit 1
+fi
+
+spark_version=$1
+
+# Initialize local Maven repository
+./tests/ci_build/initialize_maven.sh
+
+rm -rf build/
+cd jvm-packages
+# re-build package without Mock Rabit
+mvn --no-transfer-progress package -Dspark.version=${spark_version} -DskipTests
+
+# deploy to S3 bucket xgboost-maven-repo
+mvn --no-transfer-progress deploy -P release-to-s3 -DskipTests
+
+set +x
+set +e