Github user felixcheung commented on a diff in the pull request:
https://github.com/apache/spark/pull/14258#discussion_r72667631
--- Diff: R/pkg/R/install.R ---
@@ -0,0 +1,232 @@
+#
+# 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 Apache Spark to a Local Directory
+#'
+#' \code{install.spark} downloads and installs Spark to a local directory
if
+#' it is not found. The Spark version we use is the same as the SparkR
version.
+#' Users can specify a desired Hadoop version, the remote mirror site, and
+#' the directory where the package is installed locally.
+#'
+#' The full url of remote file is inferred from \code{mirrorUrl} and
\code{hadoopVersion}.
+#' \code{mirrorUrl} specifies the remote path to a Spark folder. It is
followed by a subfolder
+#' named after the Spark version (that corresponds to SparkR), and then
the tar filename.
+#' The filename is composed of four parts, i.e. [Spark
version]-bin-[Hadoop version].tgz.
+#' For example, the full path for a Spark 2.0.0 package for Hadoop 2.7 from
+#' \code{http://apache.osuosl.org} has path:
+#'
\code{http://apache.osuosl.org/spark/spark-2.0.0/spark-2.0.0-bin-hadoop2.7.tgz}.
+#' For \code{hadoopVersion = "without"}, [Hadoop version] in the filename
is then
+#' \code{without-hadoop}.
+#'
+#' @param hadoopVersion Version of Hadoop to install. Default is
\code{"2.7"}. It can take other
+#' version number in the format of "int.int".
--- End diff --
in R, there is no "int" so might not want to reference that.
how about `format of "x.y" where x and y are integer`?
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