Github user mengxr commented on a diff in the pull request:
https://github.com/apache/spark/pull/14258#discussion_r72190475
--- Diff: R/pkg/R/install.R ---
@@ -0,0 +1,155 @@
+#
+# 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.
+#
+
+# Functions to install Spark in case the user directly downloads SparkR
+# from CRAN.
+
+#' Download and Install Spark Core to Local Directory
+#'
+#' \code{install_spark} downloads and installs Spark to local directory if
+#' it is not found. The Spark version we use is 2.0.0 (preview). Users can
+#' specify a desired Hadoop version, the remote site, and the directory
where
+#' the package is installed locally.
+#'
+#' @param hadoop_version Version of Hadoop to install, 2.4, 2.6,
+#' 2.7 (default) and without
+#' @param mirror_url the base URL of the repositories to use
--- End diff --
* `mirrorUrl`
* mention `the directory layout should follow Apache mirrors
(http://www.apache.org/dyn/closer.lua/spark/)`
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