Github user felixcheung commented on a diff in the pull request:
https://github.com/apache/spark/pull/16214#discussion_r91766006
--- Diff: examples/src/main/r/native-r-package.R ---
@@ -0,0 +1,68 @@
+#
+# 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.
+#
+
+# This example illustrates how to install third-party R packages to
executors
+# in your SparkR jobs distributed by "spark.lapply".
+#
+# Note: This example will install packages to a temporary directory on
your machine.
+# The directory will be removed automatically when the example exit.
+# You environment should be connected to internet to run this
example,
+# otherwise, you should change "repos" to your private repository
url.
+# And the environment need to have necessary tools such as gcc to
compile
+# and install R package "e1071".
+#
+# To run this example use
+# ./bin/spark-submit examples/src/main/r/native-r-package.R
+
+# Load SparkR library into your R session
+library(SparkR)
+
+# Initialize SparkSession
+sparkR.session(appName = "SparkR-native-r-package-example")
+
+# $example on$
+# The directory where the third-party R packages are installed.
+libDir <- paste0(tempdir(), "/", "Rlib")
+dir.create(libDir)
+
+# Downloaded e1071 package source code to a directory
+packagesDir <- paste0(tempdir(), "/", "packages")
+dir.create(packagesDir)
+download.packages("e1071", packagesDir, repos =
"https://cran.r-project.org";)
+filename <- list.files(packagesDir, "^e1071")
+packagesPath <- file.path(packagesDir, filename)
+# Add the third-party R package to be downloaded with this Spark job on
every node.
+spark.addFile(packagesPath)
+
+path <- spark.getSparkFiles(filename)
+costs <- exp(seq(from = log(1), to = log(1000), length.out = 5))
+train <- function(cost) {
+ if("e1071" %in% rownames(installed.packages(lib = libDir)) == FALSE) {
+ install.packages(path, repos = NULL, type = "source")
--- End diff --
re: comment
[here](https://github.com/apache/spark/pull/16214#discussion_r91562425) if you
already have the package content from sparkFiles you do not need to call
`install.packages()`, which I think would be better without it.
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